Merge commit 'svn-vim'

[MacVim/KaoriYa.git] / src / getchar.c

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved    by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * getchar.c
 *
 * functions related with getting a character from the user/mapping/redo/...
 *
 * manipulations with redo buffer and stuff buffer
 * mappings and abbreviations
 */

#include "vim.h"

/*
 * These buffers are used for storing:
 * - stuffed characters: A command that is translated into another command.
 * - redo characters: will redo the last change.
 * - recorded chracters: for the "q" command.
 *
 * The bytes are stored like in the typeahead buffer:
 * - K_SPECIAL introduces a special key (two more bytes follow).  A literal
 *   K_SPECIAL is stored as K_SPECIAL KS_SPECIAL KE_FILLER.
 * - CSI introduces a GUI termcap code (also when gui.in_use is FALSE,
 *   otherwise switching the GUI on would make mappings invalid).
 *   A literal CSI is stored as CSI KS_EXTRA KE_CSI.
 * These translations are also done on multi-byte characters!
 *
 * Escaping CSI bytes is done by the system-specific input functions, called
 * by ui_inchar().
 * Escaping K_SPECIAL is done by inchar().
 * Un-escaping is done by vgetc().
 */

#define MINIMAL_SIZE 20                 /* minimal size for b_str */

static struct buffheader redobuff = {{NULL, {NUL}}, NULL, 0, 0};
static struct buffheader old_redobuff = {{NULL, {NUL}}, NULL, 0, 0};
#if defined(FEAT_AUTOCMD) || defined(FEAT_EVAL) || defined(PROTO)
static struct buffheader save_redobuff = {{NULL, {NUL}}, NULL, 0, 0};
static struct buffheader save_old_redobuff = {{NULL, {NUL}}, NULL, 0, 0};
#endif
static struct buffheader recordbuff = {{NULL, {NUL}}, NULL, 0, 0};

static int typeahead_char = 0;          /* typeahead char that's not flushed */

/*
 * when block_redo is TRUE redo buffer will not be changed
 * used by edit() to repeat insertions and 'V' command for redoing
 */
static int      block_redo = FALSE;

/*
 * Make a hash value for a mapping.
 * "mode" is the lower 4 bits of the State for the mapping.
 * "c1" is the first character of the "lhs".
 * Returns a value between 0 and 255, index in maphash.
 * Put Normal/Visual mode mappings mostly separately from Insert/Cmdline mode.
 */
#define MAP_HASH(mode, c1) (((mode) & (NORMAL + VISUAL + SELECTMODE + OP_PENDING)) ? (c1) : ((c1) ^ 0x80))

/*
 * Each mapping is put in one of the 256 hash lists, to speed up finding it.
 */
static mapblock_T       *(maphash[256]);
static int              maphash_valid = FALSE;

/*
 * List used for abbreviations.
 */
static mapblock_T       *first_abbr = NULL; /* first entry in abbrlist */

static int              KeyNoremap = 0;     /* remapping flags */

/*
 * variables used by vgetorpeek() and flush_buffers()
 *
 * typebuf.tb_buf[] contains all characters that are not consumed yet.
 * typebuf.tb_buf[typebuf.tb_off] is the first valid character.
 * typebuf.tb_buf[typebuf.tb_off + typebuf.tb_len - 1] is the last valid char.
 * typebuf.tb_buf[typebuf.tb_off + typebuf.tb_len] must be NUL.
 * The head of the buffer may contain the result of mappings, abbreviations
 * and @a commands.  The length of this part is typebuf.tb_maplen.
 * typebuf.tb_silent is the part where <silent> applies.
 * After the head are characters that come from the terminal.
 * typebuf.tb_no_abbr_cnt is the number of characters in typebuf.tb_buf that
 * should not be considered for abbreviations.
 * Some parts of typebuf.tb_buf may not be mapped. These parts are remembered
 * in typebuf.tb_noremap[], which is the same length as typebuf.tb_buf and
 * contains RM_NONE for the characters that are not to be remapped.
 * typebuf.tb_noremap[typebuf.tb_off] is the first valid flag.
 * (typebuf has been put in globals.h, because check_termcode() needs it).
 */
#define RM_YES          0       /* tb_noremap: remap */
#define RM_NONE         1       /* tb_noremap: don't remap */
#define RM_SCRIPT       2       /* tb_noremap: remap local script mappings */
#define RM_ABBR         4       /* tb_noremap: don't remap, do abbrev. */

/* typebuf.tb_buf has three parts: room in front (for result of mappings), the
 * middle for typeahead and room for new characters (which needs to be 3 *
 * MAXMAPLEN) for the Amiga).
 */
#define TYPELEN_INIT    (5 * (MAXMAPLEN + 3))
static char_u   typebuf_init[TYPELEN_INIT];     /* initial typebuf.tb_buf */
static char_u   noremapbuf_init[TYPELEN_INIT];  /* initial typebuf.tb_noremap */

static int      last_recorded_len = 0;  /* number of last recorded chars */

static char_u   *get_buffcont __ARGS((struct buffheader *, int));
static void     add_buff __ARGS((struct buffheader *, char_u *, long n));
static void     add_num_buff __ARGS((struct buffheader *, long));
static void     add_char_buff __ARGS((struct buffheader *, int));
static int      read_stuff __ARGS((int advance));
static void     start_stuff __ARGS((void));
static int      read_redo __ARGS((int, int));
static void     copy_redo __ARGS((int));
static void     init_typebuf __ARGS((void));
static void     gotchars __ARGS((char_u *, int));
static void     may_sync_undo __ARGS((void));
static void     closescript __ARGS((void));
static int      vgetorpeek __ARGS((int));
static void     map_free __ARGS((mapblock_T **));
static void     validate_maphash __ARGS((void));
static void     showmap __ARGS((mapblock_T *mp, int local));
#ifdef FEAT_EVAL
static char_u   *eval_map_expr __ARGS((char_u *str));
#endif

/*
 * Free and clear a buffer.
 */
    void
free_buff(buf)
    struct buffheader   *buf;
{
    struct buffblock    *p, *np;

    for (p = buf->bh_first.b_next; p != NULL; p = np)
    {
        np = p->b_next;
        vim_free(p);
    }
    buf->bh_first.b_next = NULL;
}

/*
 * Return the contents of a buffer as a single string.
 * K_SPECIAL and CSI in the returned string are escaped.
 */
    static char_u *
get_buffcont(buffer, dozero)
    struct buffheader   *buffer;
    int                 dozero;     /* count == zero is not an error */
{
    long_u          count = 0;
    char_u          *p = NULL;
    char_u          *p2;
    char_u          *str;
    struct buffblock *bp;

    /* compute the total length of the string */
    for (bp = buffer->bh_first.b_next; bp != NULL; bp = bp->b_next)
        count += (long_u)STRLEN(bp->b_str);

    if ((count || dozero) && (p = lalloc(count + 1, TRUE)) != NULL)
    {
        p2 = p;
        for (bp = buffer->bh_first.b_next; bp != NULL; bp = bp->b_next)
            for (str = bp->b_str; *str; )
                *p2++ = *str++;
        *p2 = NUL;
    }
    return (p);
}

/*
 * Return the contents of the record buffer as a single string
 * and clear the record buffer.
 * K_SPECIAL and CSI in the returned string are escaped.
 */
    char_u *
get_recorded()
{
    char_u      *p;
    size_t      len;

    p = get_buffcont(&recordbuff, TRUE);
    free_buff(&recordbuff);

    /*
     * Remove the characters that were added the last time, these must be the
     * (possibly mapped) characters that stopped the recording.
     */
    len = STRLEN(p);
    if ((int)len >= last_recorded_len)
    {
        len -= last_recorded_len;
        p[len] = NUL;
    }

    /*
     * When stopping recording from Insert mode with CTRL-O q, also remove the
     * CTRL-O.
     */
    if (len > 0 && restart_edit != 0 && p[len - 1] == Ctrl_O)
        p[len - 1] = NUL;

    return (p);
}

/*
 * Return the contents of the redo buffer as a single string.
 * K_SPECIAL and CSI in the returned string are escaped.
 */
    char_u *
get_inserted()
{
    return(get_buffcont(&redobuff, FALSE));
}

/*
 * Add string "s" after the current block of buffer "buf".
 * K_SPECIAL and CSI should have been escaped already.
 */
    static void
add_buff(buf, s, slen)
    struct buffheader   *buf;
    char_u              *s;
    long                slen;   /* length of "s" or -1 */
{
    struct buffblock *p;
    long_u          len;

    if (slen < 0)
        slen = (long)STRLEN(s);
    if (slen == 0)                              /* don't add empty strings */
        return;

    if (buf->bh_first.b_next == NULL)   /* first add to list */
    {
        buf->bh_space = 0;
        buf->bh_curr = &(buf->bh_first);
    }
    else if (buf->bh_curr == NULL)      /* buffer has already been read */
    {
        EMSG(_("E222: Add to read buffer"));
        return;
    }
    else if (buf->bh_index != 0)
        STRCPY(buf->bh_first.b_next->b_str,
                                 buf->bh_first.b_next->b_str + buf->bh_index);
    buf->bh_index = 0;

    if (buf->bh_space >= (int)slen)
    {
        len = (long_u)STRLEN(buf->bh_curr->b_str);
        vim_strncpy(buf->bh_curr->b_str + len, s, (size_t)slen);
        buf->bh_space -= slen;
    }
    else
    {
        if (slen < MINIMAL_SIZE)
            len = MINIMAL_SIZE;
        else
            len = slen;
        p = (struct buffblock *)lalloc((long_u)(sizeof(struct buffblock) + len),
                                                                        TRUE);
        if (p == NULL)
            return; /* no space, just forget it */
        buf->bh_space = (int)(len - slen);
        vim_strncpy(p->b_str, s, (size_t)slen);

        p->b_next = buf->bh_curr->b_next;
        buf->bh_curr->b_next = p;
        buf->bh_curr = p;
    }
    return;
}

/*
 * Add number "n" to buffer "buf".
 */
    static void
add_num_buff(buf, n)
    struct buffheader *buf;
    long              n;
{
    char_u      number[32];

    sprintf((char *)number, "%ld", n);
    add_buff(buf, number, -1L);
}

/*
 * Add character 'c' to buffer "buf".
 * Translates special keys, NUL, CSI, K_SPECIAL and multibyte characters.
 */
    static void
add_char_buff(buf, c)
    struct buffheader   *buf;
    int                 c;
{
#ifdef FEAT_MBYTE
    char_u      bytes[MB_MAXBYTES + 1];
    int         len;
    int         i;
#endif
    char_u      temp[4];

#ifdef FEAT_MBYTE
    if (IS_SPECIAL(c))
        len = 1;
    else
        len = (*mb_char2bytes)(c, bytes);
    for (i = 0; i < len; ++i)
    {
        if (!IS_SPECIAL(c))
            c = bytes[i];
#endif

        if (IS_SPECIAL(c) || c == K_SPECIAL || c == NUL)
        {
            /* translate special key code into three byte sequence */
            temp[0] = K_SPECIAL;
            temp[1] = K_SECOND(c);
            temp[2] = K_THIRD(c);
            temp[3] = NUL;
        }
#ifdef FEAT_GUI
        else if (c == CSI)
        {
            /* Translate a CSI to a CSI - KS_EXTRA - KE_CSI sequence */
            temp[0] = CSI;
            temp[1] = KS_EXTRA;
            temp[2] = (int)KE_CSI;
            temp[3] = NUL;
        }
#endif
        else
        {
            temp[0] = c;
            temp[1] = NUL;
        }
        add_buff(buf, temp, -1L);
#ifdef FEAT_MBYTE
    }
#endif
}

/*
 * Get one byte from the stuff buffer.
 * If advance == TRUE go to the next char.
 * No translation is done K_SPECIAL and CSI are escaped.
 */
    static int
read_stuff(advance)
    int         advance;
{
    char_u              c;
    struct buffblock    *curr;

    if (stuffbuff.bh_first.b_next == NULL)  /* buffer is empty */
        return NUL;

    curr = stuffbuff.bh_first.b_next;
    c = curr->b_str[stuffbuff.bh_index];

    if (advance)
    {
        if (curr->b_str[++stuffbuff.bh_index] == NUL)
        {
            stuffbuff.bh_first.b_next = curr->b_next;
            vim_free(curr);
            stuffbuff.bh_index = 0;
        }
    }
    return c;
}

/*
 * Prepare the stuff buffer for reading (if it contains something).
 */
    static void
start_stuff()
{
    if (stuffbuff.bh_first.b_next != NULL)
    {
        stuffbuff.bh_curr = &(stuffbuff.bh_first);
        stuffbuff.bh_space = 0;
    }
}

/*
 * Return TRUE if the stuff buffer is empty.
 */
    int
stuff_empty()
{
    return (stuffbuff.bh_first.b_next == NULL);
}

/*
 * Set a typeahead character that won't be flushed.
 */
    void
typeahead_noflush(c)
    int         c;
{
    typeahead_char = c;
}

/*
 * Remove the contents of the stuff buffer and the mapped characters in the
 * typeahead buffer (used in case of an error).  If 'typeahead' is true,
 * flush all typeahead characters (used when interrupted by a CTRL-C).
 */
    void
flush_buffers(typeahead)
    int typeahead;
{
    init_typebuf();

    start_stuff();
    while (read_stuff(TRUE) != NUL)
        ;

    if (typeahead)          /* remove all typeahead */
    {
        /*
         * We have to get all characters, because we may delete the first part
         * of an escape sequence.
         * In an xterm we get one char at a time and we have to get them all.
         */
        while (inchar(typebuf.tb_buf, typebuf.tb_buflen - 1, 10L,
                                                  typebuf.tb_change_cnt) != 0)
            ;
        typebuf.tb_off = MAXMAPLEN;
        typebuf.tb_len = 0;
    }
    else                    /* remove mapped characters only */
    {
        typebuf.tb_off += typebuf.tb_maplen;
        typebuf.tb_len -= typebuf.tb_maplen;
    }
    typebuf.tb_maplen = 0;
    typebuf.tb_silent = 0;
    cmd_silent = FALSE;
    typebuf.tb_no_abbr_cnt = 0;
}

/*
 * The previous contents of the redo buffer is kept in old_redobuffer.
 * This is used for the CTRL-O <.> command in insert mode.
 */
    void
ResetRedobuff()
{
    if (!block_redo)
    {
        free_buff(&old_redobuff);
        old_redobuff = redobuff;
        redobuff.bh_first.b_next = NULL;
    }
}

#if defined(FEAT_AUTOCMD) || defined(FEAT_EVAL) || defined(PROTO)
/*
 * Save redobuff and old_redobuff to save_redobuff and save_old_redobuff.
 * Used before executing autocommands and user functions.
 */
static int save_level = 0;

    void
saveRedobuff()
{
    char_u      *s;

    if (save_level++ == 0)
    {
        save_redobuff = redobuff;
        redobuff.bh_first.b_next = NULL;
        save_old_redobuff = old_redobuff;
        old_redobuff.bh_first.b_next = NULL;

        /* Make a copy, so that ":normal ." in a function works. */
        s = get_buffcont(&save_redobuff, FALSE);
        if (s != NULL)
        {
            add_buff(&redobuff, s, -1L);
            vim_free(s);
        }
    }
}

/*
 * Restore redobuff and old_redobuff from save_redobuff and save_old_redobuff.
 * Used after executing autocommands and user functions.
 */
    void
restoreRedobuff()
{
    if (--save_level == 0)
    {
        free_buff(&redobuff);
        redobuff = save_redobuff;
        free_buff(&old_redobuff);
        old_redobuff = save_old_redobuff;
    }
}
#endif

/*
 * Append "s" to the redo buffer.
 * K_SPECIAL and CSI should already have been escaped.
 */
    void
AppendToRedobuff(s)
    char_u         *s;
{
    if (!block_redo)
        add_buff(&redobuff, s, -1L);
}

/*
 * Append to Redo buffer literally, escaping special characters with CTRL-V.
 * K_SPECIAL and CSI are escaped as well.
 */
    void
AppendToRedobuffLit(str, len)
    char_u      *str;
    int         len;        /* length of "str" or -1 for up to the NUL */
{
    char_u      *s = str;
    int         c;
    char_u      *start;

    if (block_redo)
        return;

    while (len < 0 ? *s != NUL : s - str < len)
    {
        /* Put a string of normal characters in the redo buffer (that's
         * faster). */
        start = s;
        while (*s >= ' '
#ifndef EBCDIC
                && *s < DEL     /* EBCDIC: all chars above space are normal */
#endif
                && (len < 0 || s - str < len))
            ++s;

        /* Don't put '0' or '^' as last character, just in case a CTRL-D is
         * typed next. */
        if (*s == NUL && (s[-1] == '0' || s[-1] == '^'))
            --s;
        if (s > start)
            add_buff(&redobuff, start, (long)(s - start));

        if (*s == NUL || (len >= 0 && s - str >= len))
            break;

        /* Handle a special or multibyte character. */
#ifdef FEAT_MBYTE
        if (has_mbyte)
            /* Handle composing chars separately. */
            c = mb_cptr2char_adv(&s);
        else
#endif
            c = *s++;
        if (c < ' ' || c == DEL || (*s == NUL && (c == '0' || c == '^')))
            add_char_buff(&redobuff, Ctrl_V);

        /* CTRL-V '0' must be inserted as CTRL-V 048 (EBCDIC: xf0) */
        if (*s == NUL && c == '0')
#ifdef EBCDIC
            add_buff(&redobuff, (char_u *)"xf0", 3L);
#else
            add_buff(&redobuff, (char_u *)"048", 3L);
#endif
        else
            add_char_buff(&redobuff, c);
    }
}

/*
 * Append a character to the redo buffer.
 * Translates special keys, NUL, CSI, K_SPECIAL and multibyte characters.
 */
    void
AppendCharToRedobuff(c)
    int            c;
{
    if (!block_redo)
        add_char_buff(&redobuff, c);
}

/*
 * Append a number to the redo buffer.
 */
    void
AppendNumberToRedobuff(n)
    long            n;
{
    if (!block_redo)
        add_num_buff(&redobuff, n);
}

/*
 * Append string "s" to the stuff buffer.
 * CSI and K_SPECIAL must already have been escaped.
 */
    void
stuffReadbuff(s)
    char_u      *s;
{
    add_buff(&stuffbuff, s, -1L);
}

    void
stuffReadbuffLen(s, len)
    char_u      *s;
    long        len;
{
    add_buff(&stuffbuff, s, len);
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Stuff "s" into the stuff buffer, leaving special key codes unmodified and
 * escaping other K_SPECIAL and CSI bytes.
 */
    void
stuffReadbuffSpec(s)
    char_u      *s;
{
    while (*s != NUL)
    {
        if (*s == K_SPECIAL && s[1] != NUL && s[2] != NUL)
        {
            /* Insert special key literally. */
            stuffReadbuffLen(s, 3L);
            s += 3;
        }
        else
#ifdef FEAT_MBYTE
            stuffcharReadbuff(mb_ptr2char_adv(&s));
#else
            stuffcharReadbuff(*s++);
#endif
    }
}
#endif

/*
 * Append a character to the stuff buffer.
 * Translates special keys, NUL, CSI, K_SPECIAL and multibyte characters.
 */
    void
stuffcharReadbuff(c)
    int            c;
{
    add_char_buff(&stuffbuff, c);
}

/*
 * Append a number to the stuff buffer.
 */
    void
stuffnumReadbuff(n)
    long    n;
{
    add_num_buff(&stuffbuff, n);
}

/*
 * Read a character from the redo buffer.  Translates K_SPECIAL, CSI and
 * multibyte characters.
 * The redo buffer is left as it is.
 * if init is TRUE, prepare for redo, return FAIL if nothing to redo, OK
 * otherwise
 * if old is TRUE, use old_redobuff instead of redobuff
 */
    static int
read_redo(init, old_redo)
    int         init;
    int         old_redo;
{
    static struct buffblock     *bp;
    static char_u               *p;
    int                         c;
#ifdef FEAT_MBYTE
    int                         n;
    char_u                      buf[MB_MAXBYTES];
    int                         i;
#endif

    if (init)
    {
        if (old_redo)
            bp = old_redobuff.bh_first.b_next;
        else
            bp = redobuff.bh_first.b_next;
        if (bp == NULL)
            return FAIL;
        p = bp->b_str;
        return OK;
    }
    if ((c = *p) != NUL)
    {
        /* Reverse the conversion done by add_char_buff() */
#ifdef FEAT_MBYTE
        /* For a multi-byte character get all the bytes and return the
         * converted character. */
        if (has_mbyte && (c != K_SPECIAL || p[1] == KS_SPECIAL))
            n = MB_BYTE2LEN_CHECK(c);
        else
            n = 1;
        for (i = 0; ; ++i)
#endif
        {
            if (c == K_SPECIAL) /* special key or escaped K_SPECIAL */
            {
                c = TO_SPECIAL(p[1], p[2]);
                p += 2;
            }
#ifdef FEAT_GUI
            if (c == CSI)       /* escaped CSI */
                p += 2;
#endif
            if (*++p == NUL && bp->b_next != NULL)
            {
                bp = bp->b_next;
                p = bp->b_str;
            }
#ifdef FEAT_MBYTE
            buf[i] = c;
            if (i == n - 1)     /* last byte of a character */
            {
                if (n != 1)
                    c = (*mb_ptr2char)(buf);
                break;
            }
            c = *p;
            if (c == NUL)       /* cannot happen? */
                break;
#endif
        }
    }

    return c;
}

/*
 * Copy the rest of the redo buffer into the stuff buffer (in a slow way).
 * If old_redo is TRUE, use old_redobuff instead of redobuff.
 * The escaped K_SPECIAL and CSI are copied without translation.
 */
    static void
copy_redo(old_redo)
    int     old_redo;
{
    int     c;

    while ((c = read_redo(FALSE, old_redo)) != NUL)
        stuffcharReadbuff(c);
}

/*
 * Stuff the redo buffer into the stuffbuff.
 * Insert the redo count into the command.
 * If "old_redo" is TRUE, the last but one command is repeated
 * instead of the last command (inserting text). This is used for
 * CTRL-O <.> in insert mode
 *
 * return FAIL for failure, OK otherwise
 */
    int
start_redo(count, old_redo)
    long    count;
    int     old_redo;
{
    int     c;

    /* init the pointers; return if nothing to redo */
    if (read_redo(TRUE, old_redo) == FAIL)
        return FAIL;

    c = read_redo(FALSE, old_redo);

    /* copy the buffer name, if present */
    if (c == '"')
    {
        add_buff(&stuffbuff, (char_u *)"\"", 1L);
        c = read_redo(FALSE, old_redo);

        /* if a numbered buffer is used, increment the number */
        if (c >= '1' && c < '9')
            ++c;
        add_char_buff(&stuffbuff, c);
        c = read_redo(FALSE, old_redo);
    }

#ifdef FEAT_VISUAL
    if (c == 'v')   /* redo Visual */
    {
        VIsual = curwin->w_cursor;
        VIsual_active = TRUE;
        VIsual_select = FALSE;
        VIsual_reselect = TRUE;
        redo_VIsual_busy = TRUE;
        c = read_redo(FALSE, old_redo);
    }
#endif

    /* try to enter the count (in place of a previous count) */
    if (count)
    {
        while (VIM_ISDIGIT(c))  /* skip "old" count */
            c = read_redo(FALSE, old_redo);
        add_num_buff(&stuffbuff, count);
    }

    /* copy from the redo buffer into the stuff buffer */
    add_char_buff(&stuffbuff, c);
    copy_redo(old_redo);
    return OK;
}

/*
 * Repeat the last insert (R, o, O, a, A, i or I command) by stuffing
 * the redo buffer into the stuffbuff.
 * return FAIL for failure, OK otherwise
 */
    int
start_redo_ins()
{
    int     c;

    if (read_redo(TRUE, FALSE) == FAIL)
        return FAIL;
    start_stuff();

    /* skip the count and the command character */
    while ((c = read_redo(FALSE, FALSE)) != NUL)
    {
        if (vim_strchr((char_u *)"AaIiRrOo", c) != NULL)
        {
            if (c == 'O' || c == 'o')
                stuffReadbuff(NL_STR);
            break;
        }
    }

    /* copy the typed text from the redo buffer into the stuff buffer */
    copy_redo(FALSE);
    block_redo = TRUE;
    return OK;
}

    void
stop_redo_ins()
{
    block_redo = FALSE;
}

/*
 * Initialize typebuf.tb_buf to point to typebuf_init.
 * alloc() cannot be used here: In out-of-memory situations it would
 * be impossible to type anything.
 */
    static void
init_typebuf()
{
    if (typebuf.tb_buf == NULL)
    {
        typebuf.tb_buf = typebuf_init;
        typebuf.tb_noremap = noremapbuf_init;
        typebuf.tb_buflen = TYPELEN_INIT;
        typebuf.tb_len = 0;
        typebuf.tb_off = 0;
        typebuf.tb_change_cnt = 1;
    }
}

/*
 * insert a string in position 'offset' in the typeahead buffer (for "@r"
 * and ":normal" command, vgetorpeek() and check_termcode())
 *
 * If noremap is REMAP_YES, new string can be mapped again.
 * If noremap is REMAP_NONE, new string cannot be mapped again.
 * If noremap is REMAP_SKIP, fist char of new string cannot be mapped again,
 * but abbreviations are allowed.
 * If noremap is REMAP_SCRIPT, new string cannot be mapped again, except for
 *                      script-local mappings.
 * If noremap is > 0, that many characters of the new string cannot be mapped.
 *
 * If nottyped is TRUE, the string does not return KeyTyped (don't use when
 * offset is non-zero!).
 *
 * If silent is TRUE, cmd_silent is set when the characters are obtained.
 *
 * return FAIL for failure, OK otherwise
 */
    int
ins_typebuf(str, noremap, offset, nottyped, silent)
    char_u      *str;
    int         noremap;
    int         offset;
    int         nottyped;
    int         silent;
{
    char_u      *s1, *s2;
    int         newlen;
    int         addlen;
    int         i;
    int         newoff;
    int         val;
    int         nrm;

    init_typebuf();
    if (++typebuf.tb_change_cnt == 0)
        typebuf.tb_change_cnt = 1;

    addlen = (int)STRLEN(str);

    /*
     * Easy case: there is room in front of typebuf.tb_buf[typebuf.tb_off]
     */
    if (offset == 0 && addlen <= typebuf.tb_off)
    {
        typebuf.tb_off -= addlen;
        mch_memmove(typebuf.tb_buf + typebuf.tb_off, str, (size_t)addlen);
    }

    /*
     * Need to allocate a new buffer.
     * In typebuf.tb_buf there must always be room for 3 * MAXMAPLEN + 4
     * characters.  We add some extra room to avoid having to allocate too
     * often.
     */
    else
    {
        newoff = MAXMAPLEN + 4;
        newlen = typebuf.tb_len + addlen + newoff + 4 * (MAXMAPLEN + 4);
        if (newlen < 0)             /* string is getting too long */
        {
            EMSG(_(e_toocompl));    /* also calls flush_buffers */
            setcursor();
            return FAIL;
        }
        s1 = alloc(newlen);
        if (s1 == NULL)             /* out of memory */
            return FAIL;
        s2 = alloc(newlen);
        if (s2 == NULL)             /* out of memory */
        {
            vim_free(s1);
            return FAIL;
        }
        typebuf.tb_buflen = newlen;

        /* copy the old chars, before the insertion point */
        mch_memmove(s1 + newoff, typebuf.tb_buf + typebuf.tb_off,
                                                              (size_t)offset);
        /* copy the new chars */
        mch_memmove(s1 + newoff + offset, str, (size_t)addlen);
        /* copy the old chars, after the insertion point, including the NUL at
         * the end */
        mch_memmove(s1 + newoff + offset + addlen,
                                     typebuf.tb_buf + typebuf.tb_off + offset,
                                       (size_t)(typebuf.tb_len - offset + 1));
        if (typebuf.tb_buf != typebuf_init)
            vim_free(typebuf.tb_buf);
        typebuf.tb_buf = s1;

        mch_memmove(s2 + newoff, typebuf.tb_noremap + typebuf.tb_off,
                                                              (size_t)offset);
        mch_memmove(s2 + newoff + offset + addlen,
                   typebuf.tb_noremap + typebuf.tb_off + offset,
                                           (size_t)(typebuf.tb_len - offset));
        if (typebuf.tb_noremap != noremapbuf_init)
            vim_free(typebuf.tb_noremap);
        typebuf.tb_noremap = s2;

        typebuf.tb_off = newoff;
    }
    typebuf.tb_len += addlen;

    /* If noremap == REMAP_SCRIPT: do remap script-local mappings. */
    if (noremap == REMAP_SCRIPT)
        val = RM_SCRIPT;
    else if (noremap == REMAP_SKIP)
        val = RM_ABBR;
    else
        val = RM_NONE;

    /*
     * Adjust typebuf.tb_noremap[] for the new characters:
     * If noremap == REMAP_NONE or REMAP_SCRIPT: new characters are
     *                  (sometimes) not remappable
     * If noremap == REMAP_YES: all the new characters are mappable
     * If noremap  > 0: "noremap" characters are not remappable, the rest
     *                  mappable
     */
    if (noremap == REMAP_SKIP)
        nrm = 1;
    else if (noremap < 0)
        nrm = addlen;
    else
        nrm = noremap;
    for (i = 0; i < addlen; ++i)
        typebuf.tb_noremap[typebuf.tb_off + i + offset] =
                                                  (--nrm >= 0) ? val : RM_YES;

    /* tb_maplen and tb_silent only remember the length of mapped and/or
     * silent mappings at the start of the buffer, assuming that a mapped
     * sequence doesn't result in typed characters. */
    if (nottyped || typebuf.tb_maplen > offset)
        typebuf.tb_maplen += addlen;
    if (silent || typebuf.tb_silent > offset)
    {
        typebuf.tb_silent += addlen;
        cmd_silent = TRUE;
    }
    if (typebuf.tb_no_abbr_cnt && offset == 0)  /* and not used for abbrev.s */
        typebuf.tb_no_abbr_cnt += addlen;

    return OK;
}

/*
 * Put character "c" back into the typeahead buffer.
 * Can be used for a character obtained by vgetc() that needs to be put back.
 * Uses cmd_silent, KeyTyped and KeyNoremap to restore the flags belonging to
 * the char.
 */
    void
ins_char_typebuf(c)
    int     c;
{
#ifdef FEAT_MBYTE
    char_u      buf[MB_MAXBYTES];
#else
    char_u      buf[4];
#endif
    if (IS_SPECIAL(c))
    {
        buf[0] = K_SPECIAL;
        buf[1] = K_SECOND(c);
        buf[2] = K_THIRD(c);
        buf[3] = NUL;
    }
    else
    {
#ifdef FEAT_MBYTE
        buf[(*mb_char2bytes)(c, buf)] = NUL;
#else
        buf[0] = c;
        buf[1] = NUL;
#endif
    }
    (void)ins_typebuf(buf, KeyNoremap, 0, !KeyTyped, cmd_silent);
}

/*
 * Return TRUE if the typeahead buffer was changed (while waiting for a
 * character to arrive).  Happens when a message was received from a client or
 * from feedkeys().
 * But check in a more generic way to avoid trouble: When "typebuf.tb_buf"
 * changed it was reallocated and the old pointer can no longer be used.
 * Or "typebuf.tb_off" may have been changed and we would overwrite characters
 * that was just added.
 */
    int
typebuf_changed(tb_change_cnt)
    int         tb_change_cnt;  /* old value of typebuf.tb_change_cnt */
{
    return (tb_change_cnt != 0 && (typebuf.tb_change_cnt != tb_change_cnt
#if defined(FEAT_CLIENTSERVER) || defined(FEAT_EVAL)
            || typebuf_was_filled
#endif
           ));
}

/*
 * Return TRUE if there are no characters in the typeahead buffer that have
 * not been typed (result from a mapping or come from ":normal").
 */
    int
typebuf_typed()
{
    return typebuf.tb_maplen == 0;
}

#if defined(FEAT_VISUAL) || defined(PROTO)
/*
 * Return the number of characters that are mapped (or not typed).
 */
    int
typebuf_maplen()
{
    return typebuf.tb_maplen;
}
#endif

/*
 * remove "len" characters from typebuf.tb_buf[typebuf.tb_off + offset]
 */
    void
del_typebuf(len, offset)
    int len;
    int offset;
{
    int     i;

    if (len == 0)
        return;         /* nothing to do */

    typebuf.tb_len -= len;

    /*
     * Easy case: Just increase typebuf.tb_off.
     */
    if (offset == 0 && typebuf.tb_buflen - (typebuf.tb_off + len)
                                                         >= 3 * MAXMAPLEN + 3)
        typebuf.tb_off += len;
    /*
     * Have to move the characters in typebuf.tb_buf[] and typebuf.tb_noremap[]
     */
    else
    {
        i = typebuf.tb_off + offset;
        /*
         * Leave some extra room at the end to avoid reallocation.
         */
        if (typebuf.tb_off > MAXMAPLEN)
        {
            mch_memmove(typebuf.tb_buf + MAXMAPLEN,
                             typebuf.tb_buf + typebuf.tb_off, (size_t)offset);
            mch_memmove(typebuf.tb_noremap + MAXMAPLEN,
                         typebuf.tb_noremap + typebuf.tb_off, (size_t)offset);
            typebuf.tb_off = MAXMAPLEN;
        }
        /* adjust typebuf.tb_buf (include the NUL at the end) */
        mch_memmove(typebuf.tb_buf + typebuf.tb_off + offset,
                                                     typebuf.tb_buf + i + len,
                                       (size_t)(typebuf.tb_len - offset + 1));
        /* adjust typebuf.tb_noremap[] */
        mch_memmove(typebuf.tb_noremap + typebuf.tb_off + offset,
                                                 typebuf.tb_noremap + i + len,
                                           (size_t)(typebuf.tb_len - offset));
    }

    if (typebuf.tb_maplen > offset)             /* adjust tb_maplen */
    {
        if (typebuf.tb_maplen < offset + len)
            typebuf.tb_maplen = offset;
        else
            typebuf.tb_maplen -= len;
    }
    if (typebuf.tb_silent > offset)             /* adjust tb_silent */
    {
        if (typebuf.tb_silent < offset + len)
            typebuf.tb_silent = offset;
        else
            typebuf.tb_silent -= len;
    }
    if (typebuf.tb_no_abbr_cnt > offset)        /* adjust tb_no_abbr_cnt */
    {
        if (typebuf.tb_no_abbr_cnt < offset + len)
            typebuf.tb_no_abbr_cnt = offset;
        else
            typebuf.tb_no_abbr_cnt -= len;
    }

#if defined(FEAT_CLIENTSERVER) || defined(FEAT_EVAL)
    /* Reset the flag that text received from a client or from feedkeys()
     * was inserted in the typeahead buffer. */
    typebuf_was_filled = FALSE;
#endif
    if (++typebuf.tb_change_cnt == 0)
        typebuf.tb_change_cnt = 1;
}

/*
 * Write typed characters to script file.
 * If recording is on put the character in the recordbuffer.
 */
    static void
gotchars(chars, len)
    char_u      *chars;
    int         len;
{
    char_u      *s = chars;
    int         c;
    char_u      buf[2];
    int         todo = len;

    /* remember how many chars were last recorded */
    if (Recording)
        last_recorded_len += len;

    buf[1] = NUL;
    while (todo--)
    {
        /* Handle one byte at a time; no translation to be done. */
        c = *s++;
        updatescript(c);

        if (Recording)
        {
            buf[0] = c;
            add_buff(&recordbuff, buf, 1L);
        }
    }
    may_sync_undo();

#ifdef FEAT_EVAL
    /* output "debug mode" message next time in debug mode */
    debug_did_msg = FALSE;
#endif

    /* Since characters have been typed, consider the following to be in
     * another mapping.  Search string will be kept in history. */
    ++maptick;
}

/*
 * Sync undo.  Called when typed characters are obtained from the typeahead
 * buffer, or when a menu is used.
 * Do not sync:
 * - In Insert mode, unless cursor key has been used.
 * - While reading a script file.
 * - When no_u_sync is non-zero.
 */
    static void
may_sync_undo()
{
    if ((!(State & (INSERT + CMDLINE)) || arrow_used)
                                               && scriptin[curscript] == NULL)
        u_sync(FALSE);
}

/*
 * Make "typebuf" empty and allocate new buffers.
 * Returns FAIL when out of memory.
 */
    int
alloc_typebuf()
{
    typebuf.tb_buf = alloc(TYPELEN_INIT);
    typebuf.tb_noremap = alloc(TYPELEN_INIT);
    if (typebuf.tb_buf == NULL || typebuf.tb_noremap == NULL)
    {
        free_typebuf();
        return FAIL;
    }
    typebuf.tb_buflen = TYPELEN_INIT;
    typebuf.tb_off = 0;
    typebuf.tb_len = 0;
    typebuf.tb_maplen = 0;
    typebuf.tb_silent = 0;
    typebuf.tb_no_abbr_cnt = 0;
    if (++typebuf.tb_change_cnt == 0)
        typebuf.tb_change_cnt = 1;
    return OK;
}

/*
 * Free the buffers of "typebuf".
 */
    void
free_typebuf()
{
    vim_free(typebuf.tb_buf);
    vim_free(typebuf.tb_noremap);
}

/*
 * When doing ":so! file", the current typeahead needs to be saved, and
 * restored when "file" has been read completely.
 */
static typebuf_T saved_typebuf[NSCRIPT];

    int
save_typebuf()
{
    init_typebuf();
    saved_typebuf[curscript] = typebuf;
    /* If out of memory: restore typebuf and close file. */
    if (alloc_typebuf() == FAIL)
    {
        closescript();
        return FAIL;
    }
    return OK;
}

#if defined(FEAT_EVAL) || defined(FEAT_EX_EXTRA) || defined(PROTO)

/*
 * Save all three kinds of typeahead, so that the user must type at a prompt.
 */
    void
save_typeahead(tp)
    tasave_T    *tp;
{
    tp->save_typebuf = typebuf;
    tp->typebuf_valid = (alloc_typebuf() == OK);
    if (!tp->typebuf_valid)
        typebuf = tp->save_typebuf;

    tp->save_stuffbuff = stuffbuff;
    stuffbuff.bh_first.b_next = NULL;
# ifdef USE_INPUT_BUF
    tp->save_inputbuf = get_input_buf();
# endif
}

/*
 * Restore the typeahead to what it was before calling save_typeahead().
 * The allocated memory is freed, can only be called once!
 */
    void
restore_typeahead(tp)
    tasave_T    *tp;
{
    if (tp->typebuf_valid)
    {
        free_typebuf();
        typebuf = tp->save_typebuf;
    }

    free_buff(&stuffbuff);
    stuffbuff = tp->save_stuffbuff;
# ifdef USE_INPUT_BUF
    set_input_buf(tp->save_inputbuf);
# endif
}
#endif

/*
 * Open a new script file for the ":source!" command.
 */
    void
openscript(name, directly)
    char_u      *name;
    int         directly;       /* when TRUE execute directly */
{
    if (curscript + 1 == NSCRIPT)
    {
        EMSG(_(e_nesting));
        return;
    }

    if (scriptin[curscript] != NULL)    /* already reading script */
        ++curscript;
                                /* use NameBuff for expanded name */
    expand_env(name, NameBuff, MAXPATHL);
    if ((scriptin[curscript] = mch_fopen((char *)NameBuff, READBIN)) == NULL)
    {
        EMSG2(_(e_notopen), name);
        if (curscript)
            --curscript;
        return;
    }
    if (save_typebuf() == FAIL)
        return;

    /*
     * Execute the commands from the file right now when using ":source!"
     * after ":global" or ":argdo" or in a loop.  Also when another command
     * follows.  This means the display won't be updated.  Don't do this
     * always, "make test" would fail.
     */
    if (directly)
    {
        oparg_T oa;
        int     oldcurscript;
        int     save_State = State;
        int     save_restart_edit = restart_edit;
        int     save_insertmode = p_im;
        int     save_finish_op = finish_op;
        int     save_msg_scroll = msg_scroll;

        State = NORMAL;
        msg_scroll = FALSE;     /* no msg scrolling in Normal mode */
        restart_edit = 0;       /* don't go to Insert mode */
        p_im = FALSE;           /* don't use 'insertmode' */
        clear_oparg(&oa);
        finish_op = FALSE;

        oldcurscript = curscript;
        do
        {
            update_topline_cursor();    /* update cursor position and topline */
            normal_cmd(&oa, FALSE);     /* execute one command */
            vpeekc();                   /* check for end of file */
        }
        while (scriptin[oldcurscript] != NULL);

        State = save_State;
        msg_scroll = save_msg_scroll;
        restart_edit = save_restart_edit;
        p_im = save_insertmode;
        finish_op = save_finish_op;
    }
}

/*
 * Close the currently active input script.
 */
    static void
closescript()
{
    free_typebuf();
    typebuf = saved_typebuf[curscript];

    fclose(scriptin[curscript]);
    scriptin[curscript] = NULL;
    if (curscript > 0)
        --curscript;
}

#if defined(EXITFREE) || defined(PROTO)
    void
close_all_scripts()
{
    while (scriptin[0] != NULL)
        closescript();
}
#endif

#if defined(FEAT_INS_EXPAND) || defined(PROTO)
/*
 * Return TRUE when reading keys from a script file.
 */
    int
using_script()
{
    return scriptin[curscript] != NULL;
}
#endif

/*
 * This function is called just before doing a blocking wait.  Thus after
 * waiting 'updatetime' for a character to arrive.
 */
    void
before_blocking()
{
    updatescript(0);
#ifdef FEAT_EVAL
    if (may_garbage_collect)
        garbage_collect();
#endif
}

/*
 * updatescipt() is called when a character can be written into the script file
 * or when we have waited some time for a character (c == 0)
 *
 * All the changed memfiles are synced if c == 0 or when the number of typed
 * characters reaches 'updatecount' and 'updatecount' is non-zero.
 */
    void
updatescript(c)
    int c;
{
    static int      count = 0;

    if (c && scriptout)
        putc(c, scriptout);
    if (c == 0 || (p_uc > 0 && ++count >= p_uc))
    {
        ml_sync_all(c == 0, TRUE);
        count = 0;
    }
}

#define KL_PART_KEY -1          /* keylen value for incomplete key-code */
#define KL_PART_MAP -2          /* keylen value for incomplete mapping */

static int old_char = -1;       /* character put back by vungetc() */
static int old_mod_mask;        /* mod_mask for ungotten character */

/*
 * Get the next input character.
 * Can return a special key or a multi-byte character.
 * Can return NUL when called recursively, use safe_vgetc() if that's not
 * wanted.
 * This translates escaped K_SPECIAL and CSI bytes to a K_SPECIAL or CSI byte.
 * Collects the bytes of a multibyte character into the whole character.
 * Returns the modifers in the global "mod_mask".
 */
    int
vgetc()
{
    int         c, c2;
#ifdef FEAT_MBYTE
    int         n;
    char_u      buf[MB_MAXBYTES];
    int         i;
#endif

#ifdef FEAT_EVAL
    /* Do garbage collection when garbagecollect() was called previously and
     * we are now at the toplevel. */
    if (may_garbage_collect && want_garbage_collect)
        garbage_collect();
#endif

    /*
     * If a character was put back with vungetc, it was already processed.
     * Return it directly.
     */
    if (old_char != -1)
    {
        c = old_char;
        old_char = -1;
        mod_mask = old_mod_mask;
    }
    else
    {
      mod_mask = 0x0;
      last_recorded_len = 0;
      for (;;)                  /* this is done twice if there are modifiers */
      {
        if (mod_mask)           /* no mapping after modifier has been read */
        {
            ++no_mapping;
            ++allow_keys;
        }
        c = vgetorpeek(TRUE);
        if (mod_mask)
        {
            --no_mapping;
            --allow_keys;
        }

        /* Get two extra bytes for special keys */
        if (c == K_SPECIAL
#ifdef FEAT_GUI
                || c == CSI
#endif
           )
        {
            int     save_allow_keys = allow_keys;

            ++no_mapping;
            allow_keys = 0;             /* make sure BS is not found */
            c2 = vgetorpeek(TRUE);      /* no mapping for these chars */
            c = vgetorpeek(TRUE);
            --no_mapping;
            allow_keys = save_allow_keys;
            if (c2 == KS_MODIFIER)
            {
                mod_mask = c;
                continue;
            }
            c = TO_SPECIAL(c2, c);

#if defined(FEAT_GUI_W32) && defined(FEAT_MENU) && defined(FEAT_TEAROFF)
            /* Handle K_TEAROFF here, the caller of vgetc() doesn't need to
             * know that a menu was torn off */
            if (c == K_TEAROFF)
            {
                char_u  name[200];
                int     i;

                /* get menu path, it ends with a <CR> */
                for (i = 0; (c = vgetorpeek(TRUE)) != '\r'; )
                {
                    name[i] = c;
                    if (i < 199)
                        ++i;
                }
                name[i] = NUL;
                gui_make_tearoff(name);
                continue;
            }
#endif
#if defined(FEAT_GUI) && defined(HAVE_GTK2) && defined(FEAT_MENU)
            /* GTK: <F10> normally selects the menu, but it's passed until
             * here to allow mapping it.  Intercept and invoke the GTK
             * behavior if it's not mapped. */
            if (c == K_F10 && gui.menubar != NULL)
            {
                gtk_menu_shell_select_first(GTK_MENU_SHELL(gui.menubar), FALSE);
                continue;
            }
#endif
#ifdef FEAT_GUI
            /* Handle focus event here, so that the caller doesn't need to
             * know about it.  Return K_IGNORE so that we loop once (needed if
             * 'lazyredraw' is set). */
            if (c == K_FOCUSGAINED || c == K_FOCUSLOST)
            {
                ui_focus_change(c == K_FOCUSGAINED);
                c = K_IGNORE;
            }

            /* Translate K_CSI to CSI.  The special key is only used to avoid
             * it being recognized as the start of a special key. */
            if (c == K_CSI)
                c = CSI;
#endif
        }
#ifdef MSDOS
        /*
         * If K_NUL was typed, it is replaced by K_NUL, 3 in mch_inchar().
         * Delete the 3 here.
         */
        else if (c == K_NUL && vpeekc() == 3)
            (void)vgetorpeek(TRUE);
#endif

        /* a keypad or special function key was not mapped, use it like
         * its ASCII equivalent */
        switch (c)
        {
            case K_KPLUS:               c = '+'; break;
            case K_KMINUS:              c = '-'; break;
            case K_KDIVIDE:             c = '/'; break;
            case K_KMULTIPLY:   c = '*'; break;
            case K_KENTER:              c = CAR; break;
            case K_KPOINT:
#ifdef WIN32
                                    /* Can be either '.' or a ',', *
                                     * depending on the type of keypad. */
                                    c = MapVirtualKey(VK_DECIMAL, 2); break;
#else
                                    c = '.'; break;
#endif
            case K_K0:          c = '0'; break;
            case K_K1:          c = '1'; break;
            case K_K2:          c = '2'; break;
            case K_K3:          c = '3'; break;
            case K_K4:          c = '4'; break;
            case K_K5:          c = '5'; break;
            case K_K6:          c = '6'; break;
            case K_K7:          c = '7'; break;
            case K_K8:          c = '8'; break;
            case K_K9:          c = '9'; break;

            case K_XHOME:
            case K_ZHOME:       if (mod_mask == MOD_MASK_SHIFT)
                                {
                                    c = K_S_HOME;
                                    mod_mask = 0;
                                }
                                else if (mod_mask == MOD_MASK_CTRL)
                                {
                                    c = K_C_HOME;
                                    mod_mask = 0;
                                }
                                else
                                    c = K_HOME;
                                break;
            case K_XEND:
            case K_ZEND:        if (mod_mask == MOD_MASK_SHIFT)
                                {
                                    c = K_S_END;
                                    mod_mask = 0;
                                }
                                else if (mod_mask == MOD_MASK_CTRL)
                                {
                                    c = K_C_END;
                                    mod_mask = 0;
                                }
                                else
                                    c = K_END;
                                break;

            case K_XUP:         c = K_UP; break;
            case K_XDOWN:       c = K_DOWN; break;
            case K_XLEFT:       c = K_LEFT; break;
            case K_XRIGHT:      c = K_RIGHT; break;
        }

#ifdef FEAT_MBYTE
        /* For a multi-byte character get all the bytes and return the
         * converted character.
         * Note: This will loop until enough bytes are received!
         */
        if (has_mbyte && (n = MB_BYTE2LEN_CHECK(c)) > 1)
        {
            ++no_mapping;
            buf[0] = c;
            for (i = 1; i < n; ++i)
            {
                buf[i] = vgetorpeek(TRUE);
                if (buf[i] == K_SPECIAL
#ifdef FEAT_GUI
                        || buf[i] == CSI
#endif
                        )
                {
                    /* Must be a K_SPECIAL - KS_SPECIAL - KE_FILLER sequence,
                     * which represents a K_SPECIAL (0x80),
                     * or a CSI - KS_EXTRA - KE_CSI sequence, which represents
                     * a CSI (0x9B),
                     * of a K_SPECIAL - KS_EXTRA - KE_CSI, which is CSI too. */
                    c = vgetorpeek(TRUE);
                    if (vgetorpeek(TRUE) == (int)KE_CSI && c == KS_EXTRA)
                        buf[i] = CSI;
                }
            }
            --no_mapping;
            c = (*mb_ptr2char)(buf);
        }
#endif

        break;
      }
    }

#ifdef FEAT_EVAL
    /*
     * In the main loop "may_garbage_collect" can be set to do garbage
     * collection in the first next vgetc().  It's disabled after that to
     * avoid internally used Lists and Dicts to be freed.
     */
    may_garbage_collect = FALSE;
#endif

    return c;
}

/*
 * Like vgetc(), but never return a NUL when called recursively, get a key
 * directly from the user (ignoring typeahead).
 */
    int
safe_vgetc()
{
    int c;

    c = vgetc();
    if (c == NUL)
        c = get_keystroke();
    return c;
}

/*
 * Like safe_vgetc(), but loop to handle K_IGNORE.
 * Also ignore scrollbar events.
 */
    int
plain_vgetc()
{
    int c;

    do
    {
        c = safe_vgetc();
    } while (c == K_IGNORE || c == K_VER_SCROLLBAR || c == K_HOR_SCROLLBAR);
    return c;
}

/*
 * Check if a character is available, such that vgetc() will not block.
 * If the next character is a special character or multi-byte, the returned
 * character is not valid!.
 */
    int
vpeekc()
{
    if (old_char != -1)
        return old_char;
    return vgetorpeek(FALSE);
}

#if defined(FEAT_TERMRESPONSE) || defined(PROTO)
/*
 * Like vpeekc(), but don't allow mapping.  Do allow checking for terminal
 * codes.
 */
    int
vpeekc_nomap()
{
    int         c;

    ++no_mapping;
    ++allow_keys;
    c = vpeekc();
    --no_mapping;
    --allow_keys;
    return c;
}
#endif

#if defined(FEAT_INS_EXPAND) || defined(PROTO)
/*
 * Check if any character is available, also half an escape sequence.
 * Trick: when no typeahead found, but there is something in the typeahead
 * buffer, it must be an ESC that is recognized as the start of a key code.
 */
    int
vpeekc_any()
{
    int         c;

    c = vpeekc();
    if (c == NUL && typebuf.tb_len > 0)
        c = ESC;
    return c;
}
#endif

/*
 * Call vpeekc() without causing anything to be mapped.
 * Return TRUE if a character is available, FALSE otherwise.
 */
    int
char_avail()
{
    int     retval;

    ++no_mapping;
    retval = vpeekc();
    --no_mapping;
    return (retval != NUL);
}

    void
vungetc(c)      /* unget one character (can only be done once!) */
    int         c;
{
    old_char = c;
    old_mod_mask = mod_mask;
}

/*
 * get a character:
 * 1. from the stuffbuffer
 *      This is used for abbreviated commands like "D" -> "d$".
 *      Also used to redo a command for ".".
 * 2. from the typeahead buffer
 *      Stores text obtained previously but not used yet.
 *      Also stores the result of mappings.
 *      Also used for the ":normal" command.
 * 3. from the user
 *      This may do a blocking wait if "advance" is TRUE.
 *
 * if "advance" is TRUE (vgetc()):
 *      really get the character.
 *      KeyTyped is set to TRUE in the case the user typed the key.
 *      KeyStuffed is TRUE if the character comes from the stuff buffer.
 * if "advance" is FALSE (vpeekc()):
 *      just look whether there is a character available.
 *
 * When "no_mapping" is zero, checks for mappings in the current mode.
 * Only returns one byte (of a multi-byte character).
 * K_SPECIAL and CSI may be escaped, need to get two more bytes then.
 */
    static int
vgetorpeek(advance)
    int     advance;
{
    int         c, c1;
    int         keylen;
    char_u      *s;
    mapblock_T  *mp;
#ifdef FEAT_LOCALMAP
    mapblock_T  *mp2;
#endif
    mapblock_T  *mp_match;
    int         mp_match_len = 0;
    int         timedout = FALSE;           /* waited for more than 1 second
                                                for mapping to complete */
    int         mapdepth = 0;       /* check for recursive mapping */
    int         mode_deleted = FALSE;   /* set when mode has been deleted */
    int         local_State;
    int         mlen;
    int         max_mlen;
    int         i;
#ifdef FEAT_CMDL_INFO
    int         new_wcol, new_wrow;
#endif
#ifdef FEAT_GUI
# ifdef FEAT_MENU
    int         idx;
# endif
    int         shape_changed = FALSE;  /* adjusted cursor shape */
#endif
    int         n;
#ifdef FEAT_LANGMAP
    int         nolmaplen;
#endif
    int         old_wcol, old_wrow;
    int         wait_tb_len;

    /*
     * This function doesn't work very well when called recursively.  This may
     * happen though, because of:
     * 1. The call to add_to_showcmd(). char_avail() is then used to check if
     * there is a character available, which calls this function.  In that
     * case we must return NUL, to indicate no character is available.
     * 2. A GUI callback function writes to the screen, causing a
     * wait_return().
     * Using ":normal" can also do this, but it saves the typeahead buffer,
     * thus it should be OK.  But don't get a key from the user then.
     */
    if (vgetc_busy > 0
#ifdef FEAT_EX_EXTRA
            && ex_normal_busy == 0
#endif
            )
        return NUL;

    local_State = get_real_state();

    ++vgetc_busy;

    if (advance)
        KeyStuffed = FALSE;

    init_typebuf();
    start_stuff();
    if (advance && typebuf.tb_maplen == 0)
        Exec_reg = FALSE;
    do
    {
/*
 * get a character: 1. from the stuffbuffer
 */
        if (typeahead_char != 0)
        {
            c = typeahead_char;
            if (advance)
                typeahead_char = 0;
        }
        else
            c = read_stuff(advance);
        if (c != NUL && !got_int)
        {
            if (advance)
            {
                /* KeyTyped = FALSE;  When the command that stuffed something
                 * was typed, behave like the stuffed command was typed.
                 * needed for CTRL-W CTRl-] to open a fold, for example. */
                KeyStuffed = TRUE;
            }
            if (typebuf.tb_no_abbr_cnt == 0)
                typebuf.tb_no_abbr_cnt = 1;     /* no abbreviations now */
        }
        else
        {
            /*
             * Loop until we either find a matching mapped key, or we
             * are sure that it is not a mapped key.
             * If a mapped key sequence is found we go back to the start to
             * try re-mapping.
             */
            for (;;)
            {
                /*
                 * ui_breakcheck() is slow, don't use it too often when
                 * inside a mapping.  But call it each time for typed
                 * characters.
                 */
                if (typebuf.tb_maplen)
                    line_breakcheck();
                else
                    ui_breakcheck();            /* check for CTRL-C */
                keylen = 0;
                if (got_int)
                {
                    /* flush all input */
                    c = inchar(typebuf.tb_buf, typebuf.tb_buflen - 1, 0L,
                                                       typebuf.tb_change_cnt);
                    /*
                     * If inchar() returns TRUE (script file was active) or we
                     * are inside a mapping, get out of insert mode.
                     * Otherwise we behave like having gotten a CTRL-C.
                     * As a result typing CTRL-C in insert mode will
                     * really insert a CTRL-C.
                     */
                    if ((c || typebuf.tb_maplen)
                                              && (State & (INSERT + CMDLINE)))
                        c = ESC;
                    else
                        c = Ctrl_C;
                    flush_buffers(TRUE);        /* flush all typeahead */

                    if (advance)
                    {
                        /* Also record this character, it might be needed to
                         * get out of Insert mode. */
                        *typebuf.tb_buf = c;
                        gotchars(typebuf.tb_buf, 1);
                    }
                    cmd_silent = FALSE;

                    break;
                }
                else if (typebuf.tb_len > 0)
                {
                    /*
                     * Check for a mappable key sequence.
                     * Walk through one maphash[] list until we find an
                     * entry that matches.
                     *
                     * Don't look for mappings if:
                     * - no_mapping set: mapping disabled (e.g. for CTRL-V)
                     * - maphash_valid not set: no mappings present.
                     * - typebuf.tb_buf[typebuf.tb_off] should not be remapped
                     * - in insert or cmdline mode and 'paste' option set
                     * - waiting for "hit return to continue" and CR or SPACE
                     *   typed
                     * - waiting for a char with --more--
                     * - in Ctrl-X mode, and we get a valid char for that mode
                     */
                    mp = NULL;
                    max_mlen = 0;
                    c1 = typebuf.tb_buf[typebuf.tb_off];
                    if (no_mapping == 0 && maphash_valid
                            && (no_zero_mapping == 0 || c1 != '0')
                            && (typebuf.tb_maplen == 0
                                || (p_remap
                                    && (typebuf.tb_noremap[typebuf.tb_off]
                                                    & (RM_NONE|RM_ABBR)) == 0))
                            && !(p_paste && (State & (INSERT + CMDLINE)))
                            && !(State == HITRETURN && (c1 == CAR || c1 == ' '))
                            && State != ASKMORE
                            && State != CONFIRM
#ifdef FEAT_INS_EXPAND
                            && !((ctrl_x_mode != 0 && vim_is_ctrl_x_key(c1))
                                    || ((compl_cont_status & CONT_LOCAL)
                                        && (c1 == Ctrl_N || c1 == Ctrl_P)))
#endif
                            )
                    {
#ifdef FEAT_LANGMAP
                        if (c1 == K_SPECIAL)
                            nolmaplen = 2;
                        else
                        {
                            LANGMAP_ADJUST(c1, TRUE);
                            nolmaplen = 0;
                        }
#endif
#ifdef FEAT_LOCALMAP
                        /* First try buffer-local mappings. */
                        mp = curbuf->b_maphash[MAP_HASH(local_State, c1)];
                        mp2 = maphash[MAP_HASH(local_State, c1)];
                        if (mp == NULL)
                        {
                            mp = mp2;
                            mp2 = NULL;
                        }
#else
                        mp = maphash[MAP_HASH(local_State, c1)];
#endif
                        /*
                         * Loop until a partly matching mapping is found or
                         * all (local) mappings have been checked.
                         * The longest full match is remembered in "mp_match".
                         * A full match is only accepted if there is no partly
                         * match, so "aa" and "aaa" can both be mapped.
                         */
                        mp_match = NULL;
                        mp_match_len = 0;
                        for ( ; mp != NULL;
#ifdef FEAT_LOCALMAP
                                mp->m_next == NULL ? (mp = mp2, mp2 = NULL) :
#endif
                                (mp = mp->m_next))
                        {
                            /*
                             * Only consider an entry if the first character
                             * matches and it is for the current state.
                             * Skip ":lmap" mappings if keys were mapped.
                             */
                            if (mp->m_keys[0] == c1
                                    && (mp->m_mode & local_State)
                                    && ((mp->m_mode & LANGMAP) == 0
                                        || typebuf.tb_maplen == 0))
                            {
#ifdef FEAT_LANGMAP
                                int     nomap = nolmaplen;
                                int     c2;
#endif
                                /* find the match length of this mapping */
                                for (mlen = 1; mlen < typebuf.tb_len; ++mlen)
                                {
#ifdef FEAT_LANGMAP
                                    c2 = typebuf.tb_buf[typebuf.tb_off + mlen];
                                    if (nomap > 0)
                                        --nomap;
                                    else if (c2 == K_SPECIAL)
                                        nomap = 2;
                                    else
                                        LANGMAP_ADJUST(c2, TRUE);
                                    if (mp->m_keys[mlen] != c2)
#else
                                    if (mp->m_keys[mlen] !=
                                        typebuf.tb_buf[typebuf.tb_off + mlen])
#endif
                                        break;
                                }

#ifdef FEAT_MBYTE
                                /* Don't allow mapping the first byte(s) of a
                                 * multi-byte char.  Happens when mapping
                                 * <M-a> and then changing 'encoding'. */
                                if (has_mbyte && MB_BYTE2LEN(c1)
                                                  > (*mb_ptr2len)(mp->m_keys))
                                    mlen = 0;
#endif
                                /*
                                 * Check an entry whether it matches.
                                 * - Full match: mlen == keylen
                                 * - Partly match: mlen == typebuf.tb_len
                                 */
                                keylen = mp->m_keylen;
                                if (mlen == keylen
                                     || (mlen == typebuf.tb_len
                                                  && typebuf.tb_len < keylen))
                                {
                                    /*
                                     * If only script-local mappings are
                                     * allowed, check if the mapping starts
                                     * with K_SNR.
                                     */
                                    s = typebuf.tb_noremap + typebuf.tb_off;
                                    if (*s == RM_SCRIPT
                                            && (mp->m_keys[0] != K_SPECIAL
                                                || mp->m_keys[1] != KS_EXTRA
                                                || mp->m_keys[2]
                                                              != (int)KE_SNR))
                                        continue;
                                    /*
                                     * If one of the typed keys cannot be
                                     * remapped, skip the entry.
                                     */
                                    for (n = mlen; --n >= 0; )
                                        if (*s++ & (RM_NONE|RM_ABBR))
                                            break;
                                    if (n >= 0)
                                        continue;

                                    if (keylen > typebuf.tb_len)
                                    {
                                        if (!timedout)
                                        {
                                            /* break at a partly match */
                                            keylen = KL_PART_MAP;
                                            break;
                                        }
                                    }
                                    else if (keylen > mp_match_len)
                                    {
                                        /* found a longer match */
                                        mp_match = mp;
                                        mp_match_len = keylen;
                                    }
                                }
                                else
                                    /* No match; may have to check for
                                     * termcode at next character. */
                                    if (max_mlen < mlen)
                                        max_mlen = mlen;
                            }
                        }

                        /* If no partly match found, use the longest full
                         * match. */
                        if (keylen != KL_PART_MAP)
                        {
                            mp = mp_match;
                            keylen = mp_match_len;
                        }
                    }

                    /* Check for match with 'pastetoggle' */
                    if (*p_pt != NUL && mp == NULL && (State & (INSERT|NORMAL)))
                    {
                        for (mlen = 0; mlen < typebuf.tb_len && p_pt[mlen];
                                                                       ++mlen)
                            if (p_pt[mlen] != typebuf.tb_buf[typebuf.tb_off
                                                                      + mlen])
                                    break;
                        if (p_pt[mlen] == NUL)  /* match */
                        {
                            /* write chars to script file(s) */
                            if (mlen > typebuf.tb_maplen)
                                gotchars(typebuf.tb_buf + typebuf.tb_off
                                                          + typebuf.tb_maplen,
                                                    mlen - typebuf.tb_maplen);

                            del_typebuf(mlen, 0); /* remove the chars */
                            set_option_value((char_u *)"paste",
                                                     (long)!p_paste, NULL, 0);
                            if (!(State & INSERT))
                            {
                                msg_col = 0;
                                msg_row = Rows - 1;
                                msg_clr_eos();          /* clear ruler */
                            }
                            showmode();
                            setcursor();
                            continue;
                        }
                        /* Need more chars for partly match. */
                        if (mlen == typebuf.tb_len)
                            keylen = KL_PART_KEY;
                        else if (max_mlen < mlen)
                            /* no match, may have to check for termcode at
                             * next character */
                            max_mlen = mlen + 1;
                    }

                    if ((mp == NULL || max_mlen >= mp_match_len)
                                                     && keylen != KL_PART_MAP)
                    {
                        /*
                         * When no matching mapping found or found a
                         * non-matching mapping that matches at least what the
                         * matching mapping matched:
                         * Check if we have a terminal code, when:
                         *  mapping is allowed,
                         *  keys have not been mapped,
                         *  and not an ESC sequence, not in insert mode or
                         *      p_ek is on,
                         *  and when not timed out,
                         */
                        if ((no_mapping == 0 || allow_keys != 0)
                                && (typebuf.tb_maplen == 0
                                    || (p_remap && typebuf.tb_noremap[
                                                   typebuf.tb_off] == RM_YES))
                                && !timedout)
                        {
                            keylen = check_termcode(max_mlen + 1, NULL, 0);

                            /*
                             * When getting a partial match, but the last
                             * characters were not typed, don't wait for a
                             * typed character to complete the termcode.
                             * This helps a lot when a ":normal" command ends
                             * in an ESC.
                             */
                            if (keylen < 0
                                       && typebuf.tb_len == typebuf.tb_maplen)
                                keylen = 0;
                        }
                        else
                            keylen = 0;
                        if (keylen == 0)        /* no matching terminal code */
                        {
#ifdef AMIGA                    /* check for window bounds report */
                            if (typebuf.tb_maplen == 0 && (typebuf.tb_buf[
                                               typebuf.tb_off] & 0xff) == CSI)
                            {
                                for (s = typebuf.tb_buf + typebuf.tb_off + 1;
                                        s < typebuf.tb_buf + typebuf.tb_off
                                                              + typebuf.tb_len
                                   && (VIM_ISDIGIT(*s) || *s == ';'
                                                                || *s == ' ');
                                        ++s)
                                    ;
                                if (*s == 'r' || *s == '|') /* found one */
                                {
                                    del_typebuf((int)(s + 1 -
                                       (typebuf.tb_buf + typebuf.tb_off)), 0);
                                    /* get size and redraw screen */
                                    shell_resized();
                                    continue;
                                }
                                if (*s == NUL)      /* need more characters */
                                    keylen = KL_PART_KEY;
                            }
                            if (keylen >= 0)
#endif
                              /* When there was a matching mapping and no
                               * termcode could be replaced after another one,
                               * use that mapping. */
                              if (mp == NULL)
                              {
/*
 * get a character: 2. from the typeahead buffer
 */
                                c = typebuf.tb_buf[typebuf.tb_off] & 255;
                                if (advance)    /* remove chars from tb_buf */
                                {
                                    cmd_silent = (typebuf.tb_silent > 0);
                                    if (typebuf.tb_maplen > 0)
                                        KeyTyped = FALSE;
                                    else
                                    {
                                        KeyTyped = TRUE;
                                        /* write char to script file(s) */
                                        gotchars(typebuf.tb_buf
                                                         + typebuf.tb_off, 1);
                                    }
                                    KeyNoremap = typebuf.tb_noremap[
                                                              typebuf.tb_off];
                                    del_typebuf(1, 0);
                                }
                                break;      /* got character, break for loop */
                              }
                        }
                        if (keylen > 0)     /* full matching terminal code */
                        {
#if defined(FEAT_GUI) && defined(FEAT_MENU)
                            if (typebuf.tb_buf[typebuf.tb_off] == K_SPECIAL
                                         && typebuf.tb_buf[typebuf.tb_off + 1]
                                                                   == KS_MENU)
                            {
                                /*
                                 * Using a menu may cause a break in undo!
                                 * It's like using gotchars(), but without
                                 * recording or writing to a script file.
                                 */
                                may_sync_undo();
                                del_typebuf(3, 0);
                                idx = get_menu_index(current_menu, local_State);
                                if (idx != MENU_INDEX_INVALID)
                                {
# ifdef FEAT_VISUAL
                                    /*
                                     * In Select mode and a Visual mode menu
                                     * is used:  Switch to Visual mode
                                     * temporarily.  Append K_SELECT to switch
                                     * back to Select mode.
                                     */
                                    if (VIsual_active && VIsual_select
                                            && (current_menu->modes & VISUAL))
                                    {
                                        VIsual_select = FALSE;
                                        (void)ins_typebuf(K_SELECT_STRING,
                                                  REMAP_NONE, 0, TRUE, FALSE);
                                    }
# endif
                                    ins_typebuf(current_menu->strings[idx],
                                                current_menu->noremap[idx],
                                                0, TRUE,
                                                   current_menu->silent[idx]);
                                }
                            }
#endif /* FEAT_GUI */
                            continue;   /* try mapping again */
                        }

                        /* Partial match: get some more characters.  When a
                         * matching mapping was found use that one. */
                        if (mp == NULL || keylen < 0)
                            keylen = KL_PART_KEY;
                        else
                            keylen = mp_match_len;
                    }

                    /* complete match */
                    if (keylen >= 0 && keylen <= typebuf.tb_len)
                    {
                        /* write chars to script file(s) */
                        if (keylen > typebuf.tb_maplen)
                            gotchars(typebuf.tb_buf + typebuf.tb_off
                                                          + typebuf.tb_maplen,
                                                  keylen - typebuf.tb_maplen);

                        cmd_silent = (typebuf.tb_silent > 0);
                        del_typebuf(keylen, 0); /* remove the mapped keys */

                        /*
                         * Put the replacement string in front of mapstr.
                         * The depth check catches ":map x y" and ":map y x".
                         */
                        if (++mapdepth >= p_mmd)
                        {
                            EMSG(_("E223: recursive mapping"));
                            if (State & CMDLINE)
                                redrawcmdline();
                            else
                                setcursor();
                            flush_buffers(FALSE);
                            mapdepth = 0;       /* for next one */
                            c = -1;
                            break;
                        }

#ifdef FEAT_VISUAL
                        /*
                         * In Select mode and a Visual mode mapping is used:
                         * Switch to Visual mode temporarily.  Append K_SELECT
                         * to switch back to Select mode.
                         */
                        if (VIsual_active && VIsual_select
                                                     && (mp->m_mode & VISUAL))
                        {
                            VIsual_select = FALSE;
                            (void)ins_typebuf(K_SELECT_STRING, REMAP_NONE,
                                                              0, TRUE, FALSE);
                        }
#endif

#ifdef FEAT_EVAL
                        /*
                         * Handle ":map <expr>": evaluate the {rhs} as an
                         * expression.  Save and restore the typeahead so that
                         * getchar() can be used.  Also save and restore the
                         * command line for "normal :".
                         */
                        if (mp->m_expr)
                        {
                            tasave_T    tabuf;
                            int         save_vgetc_busy = vgetc_busy;

                            save_typeahead(&tabuf);
                            if (tabuf.typebuf_valid)
                            {
                                vgetc_busy = 0;
                                s = eval_map_expr(mp->m_str);
                                vgetc_busy = save_vgetc_busy;
                            }
                            else
                                s = NULL;
                            restore_typeahead(&tabuf);
                        }
                        else
#endif
                            s = mp->m_str;

                        /*
                         * Insert the 'to' part in the typebuf.tb_buf.
                         * If 'from' field is the same as the start of the
                         * 'to' field, don't remap the first character (but do
                         * allow abbreviations).
                         * If m_noremap is set, don't remap the whole 'to'
                         * part.
                         */
                        if (s == NULL)
                            i = FAIL;
                        else
                        {
                            i = ins_typebuf(s,
                                    mp->m_noremap != REMAP_YES
                                            ? mp->m_noremap
                                            : STRNCMP(s, mp->m_keys,
                                                          (size_t)keylen) != 0
                                                     ? REMAP_YES : REMAP_SKIP,
                                0, TRUE, cmd_silent || mp->m_silent);
#ifdef FEAT_EVAL
                            if (mp->m_expr)
                                vim_free(s);
#endif
                        }
                        if (i == FAIL)
                        {
                            c = -1;
                            break;
                        }
                        continue;
                    }
                }

/*
 * get a character: 3. from the user - handle <Esc> in Insert mode
 */
                /*
                 * special case: if we get an <ESC> in insert mode and there
                 * are no more characters at once, we pretend to go out of
                 * insert mode.  This prevents the one second delay after
                 * typing an <ESC>.  If we get something after all, we may
                 * have to redisplay the mode. That the cursor is in the wrong
                 * place does not matter.
                 */
                c = 0;
#ifdef FEAT_CMDL_INFO
                new_wcol = curwin->w_wcol;
                new_wrow = curwin->w_wrow;
#endif
                if (       advance
                        && typebuf.tb_len == 1
                        && typebuf.tb_buf[typebuf.tb_off] == ESC
                        && !no_mapping
#ifdef FEAT_EX_EXTRA
                        && ex_normal_busy == 0
#endif
                        && typebuf.tb_maplen == 0
                        && (State & INSERT)
                        && (p_timeout || (keylen == KL_PART_KEY && p_ttimeout))
                        && (c = inchar(typebuf.tb_buf + typebuf.tb_off
                                                     + typebuf.tb_len, 3, 25L,
                                                 typebuf.tb_change_cnt)) == 0)
                {
                    colnr_T     col = 0, vcol;
                    char_u      *ptr;

                    if (mode_displayed)
                    {
                        unshowmode(TRUE);
                        mode_deleted = TRUE;
                    }
#ifdef FEAT_GUI
                    /* may show different cursor shape */
                    if (gui.in_use)
                    {
                        int         save_State;

                        save_State = State;
                        State = NORMAL;
                        gui_update_cursor(TRUE, FALSE);
                        State = save_State;
                        shape_changed = TRUE;
                    }
#endif
                    validate_cursor();
                    old_wcol = curwin->w_wcol;
                    old_wrow = curwin->w_wrow;

                    /* move cursor left, if possible */
                    if (curwin->w_cursor.col != 0)
                    {
                        if (curwin->w_wcol > 0)
                        {
                            if (did_ai)
                            {
                                /*
                                 * We are expecting to truncate the trailing
                                 * white-space, so find the last non-white
                                 * character -- webb
                                 */
                                col = vcol = curwin->w_wcol = 0;
                                ptr = ml_get_curline();
                                while (col < curwin->w_cursor.col)
                                {
                                    if (!vim_iswhite(ptr[col]))
                                        curwin->w_wcol = vcol;
                                    vcol += lbr_chartabsize(ptr + col,
                                                               (colnr_T)vcol);
#ifdef FEAT_MBYTE
                                    if (has_mbyte)
                                        col += (*mb_ptr2len)(ptr + col);
                                    else
#endif
                                        ++col;
                                }
                                curwin->w_wrow = curwin->w_cline_row
                                           + curwin->w_wcol / W_WIDTH(curwin);
                                curwin->w_wcol %= W_WIDTH(curwin);
                                curwin->w_wcol += curwin_col_off();
#ifdef FEAT_MBYTE
                                col = 0;        /* no correction needed */
#endif
                            }
                            else
                            {
                                --curwin->w_wcol;
#ifdef FEAT_MBYTE
                                col = curwin->w_cursor.col - 1;
#endif
                            }
                        }
                        else if (curwin->w_p_wrap && curwin->w_wrow)
                        {
                            --curwin->w_wrow;
                            curwin->w_wcol = W_WIDTH(curwin) - 1;
#ifdef FEAT_MBYTE
                            col = curwin->w_cursor.col - 1;
#endif
                        }
#ifdef FEAT_MBYTE
                        if (has_mbyte && col > 0 && curwin->w_wcol > 0)
                        {
                            /* Correct when the cursor is on the right halve
                             * of a double-wide character. */
                            ptr = ml_get_curline();
                            col -= (*mb_head_off)(ptr, ptr + col);
                            if ((*mb_ptr2cells)(ptr + col) > 1)
                                --curwin->w_wcol;
                        }
#endif
                    }
                    setcursor();
                    out_flush();
#ifdef FEAT_CMDL_INFO
                    new_wcol = curwin->w_wcol;
                    new_wrow = curwin->w_wrow;
#endif
                    curwin->w_wcol = old_wcol;
                    curwin->w_wrow = old_wrow;
                }
                if (c < 0)
                    continue;   /* end of input script reached */
                typebuf.tb_len += c;

                /* buffer full, don't map */
                if (typebuf.tb_len >= typebuf.tb_maplen + MAXMAPLEN)
                {
                    timedout = TRUE;
                    continue;
                }

#ifdef FEAT_EX_EXTRA
                if (ex_normal_busy > 0)
                {
# ifdef FEAT_CMDWIN
                    static int tc = 0;
# endif

                    /* No typeahead left and inside ":normal".  Must return
                     * something to avoid getting stuck.  When an incomplete
                     * mapping is present, behave like it timed out. */
                    if (typebuf.tb_len > 0)
                    {
                        timedout = TRUE;
                        continue;
                    }
                    /* When 'insertmode' is set, ESC just beeps in Insert
                     * mode.  Use CTRL-L to make edit() return.
                     * For the command line only CTRL-C always breaks it.
                     * For the cmdline window: Alternate between ESC and
                     * CTRL-C: ESC for most situations and CTRL-C to close the
                     * cmdline window. */
                    if (p_im && (State & INSERT))
                        c = Ctrl_L;
                    else if ((State & CMDLINE)
# ifdef FEAT_CMDWIN
                            || (cmdwin_type > 0 && tc == ESC)
# endif
                            )
                        c = Ctrl_C;
                    else
                        c = ESC;
# ifdef FEAT_CMDWIN
                    tc = c;
# endif
                    break;
                }
#endif

/*
 * get a character: 3. from the user - update display
 */
                /* In insert mode a screen update is skipped when characters
                 * are still available.  But when those available characters
                 * are part of a mapping, and we are going to do a blocking
                 * wait here.  Need to update the screen to display the
                 * changed text so far. */
                if ((State & INSERT) && advance && must_redraw != 0)
                {
                    update_screen(0);
                    setcursor(); /* put cursor back where it belongs */
                }

                /*
                 * If we have a partial match (and are going to wait for more
                 * input from the user), show the partially matched characters
                 * to the user with showcmd.
                 */
#ifdef FEAT_CMDL_INFO
                i = 0;
#endif
                c1 = 0;
                if (typebuf.tb_len > 0 && advance && !exmode_active)
                {
                    if (((State & (NORMAL | INSERT)) || State == LANGMAP)
                            && State != HITRETURN)
                    {
                        /* this looks nice when typing a dead character map */
                        if (State & INSERT
                            && ptr2cells(typebuf.tb_buf + typebuf.tb_off
                                                   + typebuf.tb_len - 1) == 1)
                        {
                            edit_putchar(typebuf.tb_buf[typebuf.tb_off
                                                + typebuf.tb_len - 1], FALSE);
                            setcursor(); /* put cursor back where it belongs */
                            c1 = 1;
                        }
#ifdef FEAT_CMDL_INFO
                        /* need to use the col and row from above here */
                        old_wcol = curwin->w_wcol;
                        old_wrow = curwin->w_wrow;
                        curwin->w_wcol = new_wcol;
                        curwin->w_wrow = new_wrow;
                        push_showcmd();
                        if (typebuf.tb_len > SHOWCMD_COLS)
                            i = typebuf.tb_len - SHOWCMD_COLS;
                        while (i < typebuf.tb_len)
                            (void)add_to_showcmd(typebuf.tb_buf[typebuf.tb_off
                                                                      + i++]);
                        curwin->w_wcol = old_wcol;
                        curwin->w_wrow = old_wrow;
#endif
                    }

                    /* this looks nice when typing a dead character map */
                    if ((State & CMDLINE)
#if defined(FEAT_CRYPT) || defined(FEAT_EVAL)
                            && cmdline_star == 0
#endif
                            && ptr2cells(typebuf.tb_buf + typebuf.tb_off
                                                   + typebuf.tb_len - 1) == 1)
                    {
                        putcmdline(typebuf.tb_buf[typebuf.tb_off
                                                + typebuf.tb_len - 1], FALSE);
                        c1 = 1;
                    }
                }

/*
 * get a character: 3. from the user - get it
 */
                wait_tb_len = typebuf.tb_len;
                c = inchar(typebuf.tb_buf + typebuf.tb_off + typebuf.tb_len,
                        typebuf.tb_buflen - typebuf.tb_off - typebuf.tb_len - 1,
                        !advance
                            ? 0
                            : ((typebuf.tb_len == 0
                                    || !(p_timeout || (p_ttimeout
                                                   && keylen == KL_PART_KEY)))
                                    ? -1L
                                    : ((keylen == KL_PART_KEY && p_ttm >= 0)
                                            ? p_ttm
                                            : p_tm)), typebuf.tb_change_cnt);

#ifdef FEAT_CMDL_INFO
                if (i != 0)
                    pop_showcmd();
#endif
                if (c1 == 1)
                {
                    if (State & INSERT)
                        edit_unputchar();
                    if (State & CMDLINE)
                        unputcmdline();
                    setcursor();        /* put cursor back where it belongs */
                }

                if (c < 0)
                    continue;           /* end of input script reached */
                if (c == NUL)           /* no character available */
                {
                    if (!advance)
                        break;
                    if (wait_tb_len > 0)        /* timed out */
                    {
                        timedout = TRUE;
                        continue;
                    }
                }
                else
                {           /* allow mapping for just typed characters */
                    while (typebuf.tb_buf[typebuf.tb_off
                                                     + typebuf.tb_len] != NUL)
                        typebuf.tb_noremap[typebuf.tb_off
                                                 + typebuf.tb_len++] = RM_YES;
#ifdef USE_IM_CONTROL
                    /* Get IM status right after getting keys, not after the
                     * timeout for a mapping (focus may be lost by then). */
                    vgetc_im_active = im_get_status();
#endif
                }
            }       /* for (;;) */
        }       /* if (!character from stuffbuf) */

                        /* if advance is FALSE don't loop on NULs */
    } while (c < 0 || (advance && c == NUL));

    /*
     * The "INSERT" message is taken care of here:
     *   if we return an ESC to exit insert mode, the message is deleted
     *   if we don't return an ESC but deleted the message before, redisplay it
     */
    if (advance && p_smd && msg_silent == 0 && (State & INSERT))
    {
        if (c == ESC && !mode_deleted && !no_mapping && mode_displayed)
        {
            if (typebuf.tb_len && !KeyTyped)
                redraw_cmdline = TRUE;      /* delete mode later */
            else
                unshowmode(FALSE);
        }
        else if (c != ESC && mode_deleted)
        {
            if (typebuf.tb_len && !KeyTyped)
                redraw_cmdline = TRUE;      /* show mode later */
            else
                showmode();
        }
    }
#ifdef FEAT_GUI
    /* may unshow different cursor shape */
    if (gui.in_use && shape_changed)
        gui_update_cursor(TRUE, FALSE);
#endif

    --vgetc_busy;

    return c;
}

/*
 * inchar() - get one character from
 *      1. a scriptfile
 *      2. the keyboard
 *
 *  As much characters as we can get (upto 'maxlen') are put in "buf" and
 *  NUL terminated (buffer length must be 'maxlen' + 1).
 *  Minimum for "maxlen" is 3!!!!
 *
 *  "tb_change_cnt" is the value of typebuf.tb_change_cnt if "buf" points into
 *  it.  When typebuf.tb_change_cnt changes (e.g., when a message is received
 *  from a remote client) "buf" can no longer be used.  "tb_change_cnt" is 0
 *  otherwise.
 *
 *  If we got an interrupt all input is read until none is available.
 *
 *  If wait_time == 0  there is no waiting for the char.
 *  If wait_time == n  we wait for n msec for a character to arrive.
 *  If wait_time == -1 we wait forever for a character to arrive.
 *
 *  Return the number of obtained characters.
 *  Return -1 when end of input script reached.
 */
    int
inchar(buf, maxlen, wait_time, tb_change_cnt)
    char_u      *buf;
    int         maxlen;
    long        wait_time;          /* milli seconds */
    int         tb_change_cnt;
{
    int         len = 0;            /* init for GCC */
    int         retesc = FALSE;     /* return ESC with gotint */
    int         script_char;

    if (wait_time == -1L || wait_time > 100L)  /* flush output before waiting */
    {
        cursor_on();
        out_flush();
#ifdef FEAT_GUI
        if (gui.in_use)
        {
            gui_update_cursor(FALSE, FALSE);
# ifdef FEAT_MOUSESHAPE
            if (postponed_mouseshape)
                update_mouseshape(-1);
# endif
        }
#endif
    }

    /*
     * Don't reset these when at the hit-return prompt, otherwise a endless
     * recursive loop may result (write error in swapfile, hit-return, timeout
     * on char wait, flush swapfile, write error....).
     */
    if (State != HITRETURN)
    {
        did_outofmem_msg = FALSE;   /* display out of memory message (again) */
        did_swapwrite_msg = FALSE;  /* display swap file write error again */
    }
    undo_off = FALSE;               /* restart undo now */

    /*
     * first try script file
     *  If interrupted: Stop reading script files.
     */
    script_char = -1;
    while (scriptin[curscript] != NULL && script_char < 0)
    {
        if (got_int || (script_char = getc(scriptin[curscript])) < 0)
        {
            /* Reached EOF.
             * Careful: closescript() frees typebuf.tb_buf[] and buf[] may
             * point inside typebuf.tb_buf[].  Don't use buf[] after this! */
            closescript();
            /*
             * When reading script file is interrupted, return an ESC to get
             * back to normal mode.
             * Otherwise return -1, because typebuf.tb_buf[] has changed.
             */
            if (got_int)
                retesc = TRUE;
            else
                return -1;
        }
        else
        {
            buf[0] = script_char;
            len = 1;
        }
    }

    if (script_char < 0)        /* did not get a character from script */
    {
        /*
         * If we got an interrupt, skip all previously typed characters and
         * return TRUE if quit reading script file.
         * Stop reading typeahead when a single CTRL-C was read,
         * fill_input_buf() returns this when not able to read from stdin.
         * Don't use buf[] here, closescript() may have freed typebuf.tb_buf[]
         * and buf may be pointing inside typebuf.tb_buf[].
         */
        if (got_int)
        {
#define DUM_LEN MAXMAPLEN * 3 + 3
            char_u      dum[DUM_LEN + 1];

            for (;;)
            {
                len = ui_inchar(dum, DUM_LEN, 0L, 0);
                if (len == 0 || (len == 1 && dum[0] == 3))
                    break;
            }
            return retesc;
        }

        /*
         * Always flush the output characters when getting input characters
         * from the user.
         */
        out_flush();

        /*
         * Fill up to a third of the buffer, because each character may be
         * tripled below.
         */
        len = ui_inchar(buf, maxlen / 3, wait_time, tb_change_cnt);
    }

    if (typebuf_changed(tb_change_cnt))
        return 0;

    return fix_input_buffer(buf, len, script_char >= 0);
}

/*
 * Fix typed characters for use by vgetc() and check_termcode().
 * buf[] must have room to triple the number of bytes!
 * Returns the new length.
 */
    int
fix_input_buffer(buf, len, script)
    char_u      *buf;
    int         len;
    int         script;         /* TRUE when reading from a script */
{
    int         i;
    char_u      *p = buf;

    /*
     * Two characters are special: NUL and K_SPECIAL.
     * When compiled With the GUI CSI is also special.
     * Replace       NUL by K_SPECIAL KS_ZERO    KE_FILLER
     * Replace K_SPECIAL by K_SPECIAL KS_SPECIAL KE_FILLER
     * Replace       CSI by K_SPECIAL KS_EXTRA   KE_CSI
     * Don't replace K_SPECIAL when reading a script file.
     */
    for (i = len; --i >= 0; ++p)
    {
#ifdef FEAT_GUI
        /* When the GUI is used any character can come after a CSI, don't
         * escape it. */
        if (gui.in_use && p[0] == CSI && i >= 2)
        {
            p += 2;
            i -= 2;
        }
        /* When the GUI is not used CSI needs to be escaped. */
        else if (!gui.in_use && p[0] == CSI)
        {
            mch_memmove(p + 3, p + 1, (size_t)i);
            *p++ = K_SPECIAL;
            *p++ = KS_EXTRA;
            *p = (int)KE_CSI;
            len += 2;
        }
        else
#endif
        if (p[0] == NUL || (p[0] == K_SPECIAL && !script
#ifdef FEAT_AUTOCMD
                    /* timeout may generate K_CURSORHOLD */
                    && (i < 2 || p[1] != KS_EXTRA || p[2] != (int)KE_CURSORHOLD)
#endif
#if defined(WIN3264) && !defined(FEAT_GUI)
                    /* Win32 console passes modifiers */
                    && (i < 2 || p[1] != KS_MODIFIER)
#endif
                    ))
        {
            mch_memmove(p + 3, p + 1, (size_t)i);
            p[2] = K_THIRD(p[0]);
            p[1] = K_SECOND(p[0]);
            p[0] = K_SPECIAL;
            p += 2;
            len += 2;
        }
    }
    *p = NUL;           /* add trailing NUL */
    return len;
}

#if defined(USE_INPUT_BUF) || defined(PROTO)
/*
 * Return TRUE when bytes are in the input buffer or in the typeahead buffer.
 * Normally the input buffer would be sufficient, but the server_to_input_buf()
 * or feedkeys() may insert characters in the typeahead buffer while we are
 * waiting for input to arrive.
 */
    int
input_available()
{
    return (!vim_is_input_buf_empty()
# if defined(FEAT_CLIENTSERVER) || defined(FEAT_EVAL)
            || typebuf_was_filled
# endif
            );
}
#endif

/*
 * map[!]                   : show all key mappings
 * map[!] {lhs}             : show key mapping for {lhs}
 * map[!] {lhs} {rhs}       : set key mapping for {lhs} to {rhs}
 * noremap[!] {lhs} {rhs}   : same, but no remapping for {rhs}
 * unmap[!] {lhs}           : remove key mapping for {lhs}
 * abbr                     : show all abbreviations
 * abbr {lhs}               : show abbreviations for {lhs}
 * abbr {lhs} {rhs}         : set abbreviation for {lhs} to {rhs}
 * noreabbr {lhs} {rhs}     : same, but no remapping for {rhs}
 * unabbr {lhs}             : remove abbreviation for {lhs}
 *
 * maptype: 0 for :map, 1 for :unmap, 2 for noremap.
 *
 * arg is pointer to any arguments. Note: arg cannot be a read-only string,
 * it will be modified.
 *
 * for :map   mode is NORMAL + VISUAL + SELECTMODE + OP_PENDING
 * for :map!  mode is INSERT + CMDLINE
 * for :cmap  mode is CMDLINE
 * for :imap  mode is INSERT
 * for :lmap  mode is LANGMAP
 * for :nmap  mode is NORMAL
 * for :vmap  mode is VISUAL + SELECTMODE
 * for :xmap  mode is VISUAL
 * for :smap  mode is SELECTMODE
 * for :omap  mode is OP_PENDING
 *
 * for :abbr  mode is INSERT + CMDLINE
 * for :iabbr mode is INSERT
 * for :cabbr mode is CMDLINE
 *
 * Return 0 for success
 *        1 for invalid arguments
 *        2 for no match
 *        4 for out of mem
 *        5 for entry not unique
 */
    int
do_map(maptype, arg, mode, abbrev)
    int         maptype;
    char_u      *arg;
    int         mode;
    int         abbrev;         /* not a mapping but an abbreviation */
{
    char_u      *keys;
    mapblock_T  *mp, **mpp;
    char_u      *rhs;
    char_u      *p;
    int         n;
    int         len = 0;        /* init for GCC */
    char_u      *newstr;
    int         hasarg;
    int         haskey;
    int         did_it = FALSE;
#ifdef FEAT_LOCALMAP
    int         did_local = FALSE;
#endif
    int         round;
    char_u      *keys_buf = NULL;
    char_u      *arg_buf = NULL;
    int         retval = 0;
    int         do_backslash;
    int         hash;
    int         new_hash;
    mapblock_T  **abbr_table;
    mapblock_T  **map_table;
    int         unique = FALSE;
    int         silent = FALSE;
    int         special = FALSE;
#ifdef FEAT_EVAL
    int         expr = FALSE;
#endif
    int         noremap;

    keys = arg;
    map_table = maphash;
    abbr_table = &first_abbr;

    /* For ":noremap" don't remap, otherwise do remap. */
    if (maptype == 2)
        noremap = REMAP_NONE;
    else
        noremap = REMAP_YES;

    /* Accept <buffer>, <silent>, <expr> <script> and <unique> in any order. */
    for (;;)
    {
#ifdef FEAT_LOCALMAP
        /*
         * Check for "<buffer>": mapping local to buffer.
         */
        if (STRNCMP(keys, "<buffer>", 8) == 0)
        {
            keys = skipwhite(keys + 8);
            map_table = curbuf->b_maphash;
            abbr_table = &curbuf->b_first_abbr;
            continue;
        }
#endif

        /*
         * Check for "<silent>": don't echo commands.
         */
        if (STRNCMP(keys, "<silent>", 8) == 0)
        {
            keys = skipwhite(keys + 8);
            silent = TRUE;
            continue;
        }

        /*
         * Check for "<special>": accept special keys in <>
         */
        if (STRNCMP(keys, "<special>", 9) == 0)
        {
            keys = skipwhite(keys + 9);
            special = TRUE;
            continue;
        }

#ifdef FEAT_EVAL
        /*
         * Check for "<script>": remap script-local mappings only
         */
        if (STRNCMP(keys, "<script>", 8) == 0)
        {
            keys = skipwhite(keys + 8);
            noremap = REMAP_SCRIPT;
            continue;
        }

        /*
         * Check for "<expr>": {rhs} is an expression.
         */
        if (STRNCMP(keys, "<expr>", 6) == 0)
        {
            keys = skipwhite(keys + 6);
            expr = TRUE;
            continue;
        }
#endif
        /*
         * Check for "<unique>": don't overwrite an existing mapping.
         */
        if (STRNCMP(keys, "<unique>", 8) == 0)
        {
            keys = skipwhite(keys + 8);
            unique = TRUE;
            continue;
        }
        break;
    }

    validate_maphash();

    /*
     * find end of keys and skip CTRL-Vs (and backslashes) in it
     * Accept backslash like CTRL-V when 'cpoptions' does not contain 'B'.
     * with :unmap white space is included in the keys, no argument possible
     */
    p = keys;
    do_backslash = (vim_strchr(p_cpo, CPO_BSLASH) == NULL);
    while (*p && (maptype == 1 || !vim_iswhite(*p)))
    {
        if ((p[0] == Ctrl_V || (do_backslash && p[0] == '\\')) &&
                                                                  p[1] != NUL)
            ++p;                /* skip CTRL-V or backslash */
        ++p;
    }
    if (*p != NUL)
        *p++ = NUL;
    p = skipwhite(p);
    rhs = p;
    hasarg = (*rhs != NUL);
    haskey = (*keys != NUL);

    /* check for :unmap without argument */
    if (maptype == 1 && !haskey)
    {
        retval = 1;
        goto theend;
    }

    /*
     * If mapping has been given as ^V<C_UP> say, then replace the term codes
     * with the appropriate two bytes. If it is a shifted special key, unshift
     * it too, giving another two bytes.
     * replace_termcodes() may move the result to allocated memory, which
     * needs to be freed later (*keys_buf and *arg_buf).
     * replace_termcodes() also removes CTRL-Vs and sometimes backslashes.
     */
    if (haskey)
        keys = replace_termcodes(keys, &keys_buf, TRUE, TRUE, special);
    if (hasarg)
    {
        if (STRICMP(rhs, "<nop>") == 0)     /* "<Nop>" means nothing */
            rhs = (char_u *)"";
        else
            rhs = replace_termcodes(rhs, &arg_buf, FALSE, TRUE, special);
    }

#ifdef FEAT_FKMAP
    /*
     * when in right-to-left mode and alternate keymap option set,
     * reverse the character flow in the rhs in Farsi.
     */
    if (p_altkeymap && curwin->w_p_rl)
        lrswap(rhs);
#endif

    /*
     * check arguments and translate function keys
     */
    if (haskey)
    {
        len = (int)STRLEN(keys);
        if (len > MAXMAPLEN)            /* maximum length of MAXMAPLEN chars */
        {
            retval = 1;
            goto theend;
        }

        if (abbrev && maptype != 1)
        {
            /*
             * If an abbreviation ends in a keyword character, the
             * rest must be all keyword-char or all non-keyword-char.
             * Otherwise we won't be able to find the start of it in a
             * vi-compatible way.
             */
#ifdef FEAT_MBYTE
            if (has_mbyte)
            {
                int     first, last;
                int     same = -1;

                first = vim_iswordp(keys);
                last = first;
                p = keys + (*mb_ptr2len)(keys);
                n = 1;
                while (p < keys + len)
                {
                    ++n;                        /* nr of (multi-byte) chars */
                    last = vim_iswordp(p);      /* type of last char */
                    if (same == -1 && last != first)
                        same = n - 1;           /* count of same char type */
                    p += (*mb_ptr2len)(p);
                }
                if (last && n > 2 && same >= 0 && same < n - 1)
                {
                    retval = 1;
                    goto theend;
                }
            }
            else
#endif
                if (vim_iswordc(keys[len - 1])) /* ends in keyword char */
                    for (n = 0; n < len - 2; ++n)
                        if (vim_iswordc(keys[n]) != vim_iswordc(keys[len - 2]))
                        {
                            retval = 1;
                            goto theend;
                        }
            /* An abbrevation cannot contain white space. */
            for (n = 0; n < len; ++n)
                if (vim_iswhite(keys[n]))
                {
                    retval = 1;
                    goto theend;
                }
        }
    }

    if (haskey && hasarg && abbrev)     /* if we will add an abbreviation */
        no_abbr = FALSE;                /* reset flag that indicates there are
                                                            no abbreviations */

    if (!haskey || (maptype != 1 && !hasarg))
        msg_start();

#ifdef FEAT_LOCALMAP
    /*
     * Check if a new local mapping wasn't already defined globally.
     */
    if (map_table == curbuf->b_maphash && haskey && hasarg && maptype != 1)
    {
        /* need to loop over all global hash lists */
        for (hash = 0; hash < 256 && !got_int; ++hash)
        {
            if (abbrev)
            {
                if (hash != 0)  /* there is only one abbreviation list */
                    break;
                mp = first_abbr;
            }
            else
                mp = maphash[hash];
            for ( ; mp != NULL && !got_int; mp = mp->m_next)
            {
                /* check entries with the same mode */
                if ((mp->m_mode & mode) != 0
                        && mp->m_keylen == len
                        && unique
                        && STRNCMP(mp->m_keys, keys, (size_t)len) == 0)
                {
                    if (abbrev)
                        EMSG2(_("E224: global abbreviation already exists for %s"),
                                mp->m_keys);
                    else
                        EMSG2(_("E225: global mapping already exists for %s"),
                                mp->m_keys);
                    retval = 5;
                    goto theend;
                }
            }
        }
    }

    /*
     * When listing global mappings, also list buffer-local ones here.
     */
    if (map_table != curbuf->b_maphash && !hasarg && maptype != 1)
    {
        /* need to loop over all global hash lists */
        for (hash = 0; hash < 256 && !got_int; ++hash)
        {
            if (abbrev)
            {
                if (hash != 0)  /* there is only one abbreviation list */
                    break;
                mp = curbuf->b_first_abbr;
            }
            else
                mp = curbuf->b_maphash[hash];
            for ( ; mp != NULL && !got_int; mp = mp->m_next)
            {
                /* check entries with the same mode */
                if ((mp->m_mode & mode) != 0)
                {
                    if (!haskey)                    /* show all entries */
                    {
                        showmap(mp, TRUE);
                        did_local = TRUE;
                    }
                    else
                    {
                        n = mp->m_keylen;
                        if (STRNCMP(mp->m_keys, keys,
                                            (size_t)(n < len ? n : len)) == 0)
                        {
                            showmap(mp, TRUE);
                            did_local = TRUE;
                        }
                    }
                }
            }
        }
    }
#endif

    /*
     * Find an entry in the maphash[] list that matches.
     * For :unmap we may loop two times: once to try to unmap an entry with a
     * matching 'from' part, a second time, if the first fails, to unmap an
     * entry with a matching 'to' part. This was done to allow ":ab foo bar"
     * to be unmapped by typing ":unab foo", where "foo" will be replaced by
     * "bar" because of the abbreviation.
     */
    for (round = 0; (round == 0 || maptype == 1) && round <= 1
                                              && !did_it && !got_int; ++round)
    {
        /* need to loop over all hash lists */
        for (hash = 0; hash < 256 && !got_int; ++hash)
        {
            if (abbrev)
            {
                if (hash > 0)   /* there is only one abbreviation list */
                    break;
                mpp = abbr_table;
            }
            else
                mpp = &(map_table[hash]);
            for (mp = *mpp; mp != NULL && !got_int; mp = *mpp)
            {

                if (!(mp->m_mode & mode))   /* skip entries with wrong mode */
                {
                    mpp = &(mp->m_next);
                    continue;
                }
                if (!haskey)                /* show all entries */
                {
                    showmap(mp, map_table != maphash);
                    did_it = TRUE;
                }
                else                        /* do we have a match? */
                {
                    if (round)      /* second round: Try unmap "rhs" string */
                    {
                        n = (int)STRLEN(mp->m_str);
                        p = mp->m_str;
                    }
                    else
                    {
                        n = mp->m_keylen;
                        p = mp->m_keys;
                    }
                    if (STRNCMP(p, keys, (size_t)(n < len ? n : len)) == 0)
                    {
                        if (maptype == 1)       /* delete entry */
                        {
                            /* Only accept a full match.  For abbreviations we
                             * ignore trailing space when matching with the
                             * "lhs", since an abbreviation can't have
                             * trailing space. */
                            if (n != len && (!abbrev || round || n > len
                                               || *skipwhite(keys + n) != NUL))
                            {
                                mpp = &(mp->m_next);
                                continue;
                            }
                            /*
                             * We reset the indicated mode bits. If nothing is
                             * left the entry is deleted below.
                             */
                            mp->m_mode &= ~mode;
                            did_it = TRUE;      /* remember we did something */
                        }
                        else if (!hasarg)       /* show matching entry */
                        {
                            showmap(mp, map_table != maphash);
                            did_it = TRUE;
                        }
                        else if (n != len)      /* new entry is ambiguous */
                        {
                            mpp = &(mp->m_next);
                            continue;
                        }
                        else if (unique)
                        {
                            if (abbrev)
                                EMSG2(_("E226: abbreviation already exists for %s"),
                                                                           p);
                            else
                                EMSG2(_("E227: mapping already exists for %s"), p);
                            retval = 5;
                            goto theend;
                        }
                        else                    /* new rhs for existing entry */
                        {
                            mp->m_mode &= ~mode;        /* remove mode bits */
                            if (mp->m_mode == 0 && !did_it) /* reuse entry */
                            {
                                newstr = vim_strsave(rhs);
                                if (newstr == NULL)
                                {
                                    retval = 4;         /* no mem */
                                    goto theend;
                                }
                                vim_free(mp->m_str);
                                mp->m_str = newstr;
                                mp->m_noremap = noremap;
                                mp->m_silent = silent;
                                mp->m_mode = mode;
#ifdef FEAT_EVAL
                                mp->m_expr = expr;
                                mp->m_script_ID = current_SID;
#endif
                                did_it = TRUE;
                            }
                        }
                        if (mp->m_mode == 0)    /* entry can be deleted */
                        {
                            map_free(mpp);
                            continue;           /* continue with *mpp */
                        }

                        /*
                         * May need to put this entry into another hash list.
                         */
                        new_hash = MAP_HASH(mp->m_mode, mp->m_keys[0]);
                        if (!abbrev && new_hash != hash)
                        {
                            *mpp = mp->m_next;
                            mp->m_next = map_table[new_hash];
                            map_table[new_hash] = mp;

                            continue;           /* continue with *mpp */
                        }
                    }
                }
                mpp = &(mp->m_next);
            }
        }
    }

    if (maptype == 1)                       /* delete entry */
    {
        if (!did_it)
            retval = 2;                     /* no match */
        goto theend;
    }

    if (!haskey || !hasarg)                 /* print entries */
    {
        if (!did_it
#ifdef FEAT_LOCALMAP
                && !did_local
#endif
                )
        {
            if (abbrev)
                MSG(_("No abbreviation found"));
            else
                MSG(_("No mapping found"));
        }
        goto theend;                        /* listing finished */
    }

    if (did_it)                 /* have added the new entry already */
        goto theend;

    /*
     * Get here when adding a new entry to the maphash[] list or abbrlist.
     */
    mp = (mapblock_T *)alloc((unsigned)sizeof(mapblock_T));
    if (mp == NULL)
    {
        retval = 4;         /* no mem */
        goto theend;
    }

    /* If CTRL-C has been mapped, don't always use it for Interrupting */
    if (*keys == Ctrl_C)
        mapped_ctrl_c = TRUE;

    mp->m_keys = vim_strsave(keys);
    mp->m_str = vim_strsave(rhs);
    if (mp->m_keys == NULL || mp->m_str == NULL)
    {
        vim_free(mp->m_keys);
        vim_free(mp->m_str);
        vim_free(mp);
        retval = 4;     /* no mem */
        goto theend;
    }
    mp->m_keylen = (int)STRLEN(mp->m_keys);
    mp->m_noremap = noremap;
    mp->m_silent = silent;
    mp->m_mode = mode;
#ifdef FEAT_EVAL
    mp->m_expr = expr;
    mp->m_script_ID = current_SID;
#endif

    /* add the new entry in front of the abbrlist or maphash[] list */
    if (abbrev)
    {
        mp->m_next = *abbr_table;
        *abbr_table = mp;
    }
    else
    {
        n = MAP_HASH(mp->m_mode, mp->m_keys[0]);
        mp->m_next = map_table[n];
        map_table[n] = mp;
    }

theend:
    vim_free(keys_buf);
    vim_free(arg_buf);
    return retval;
}

/*
 * Delete one entry from the abbrlist or maphash[].
 * "mpp" is a pointer to the m_next field of the PREVIOUS entry!
 */
    static void
map_free(mpp)
    mapblock_T  **mpp;
{
    mapblock_T  *mp;

    mp = *mpp;
    vim_free(mp->m_keys);
    vim_free(mp->m_str);
    *mpp = mp->m_next;
    vim_free(mp);
}

/*
 * Initialize maphash[] for first use.
 */
    static void
validate_maphash()
{
    if (!maphash_valid)
    {
        vim_memset(maphash, 0, sizeof(maphash));
        maphash_valid = TRUE;
    }
}

/*
 * Get the mapping mode from the command name.
 */
    int
get_map_mode(cmdp, forceit)
    char_u      **cmdp;
    int         forceit;
{
    char_u      *p;
    int         modec;
    int         mode;

    p = *cmdp;
    modec = *p++;
    if (modec == 'i')
        mode = INSERT;                          /* :imap */
    else if (modec == 'l')
        mode = LANGMAP;                         /* :lmap */
    else if (modec == 'c')
        mode = CMDLINE;                         /* :cmap */
    else if (modec == 'n' && *p != 'o')             /* avoid :noremap */
        mode = NORMAL;                          /* :nmap */
    else if (modec == 'v')
        mode = VISUAL + SELECTMODE;             /* :vmap */
    else if (modec == 'x')
        mode = VISUAL;                          /* :xmap */
    else if (modec == 's')
        mode = SELECTMODE;                      /* :smap */
    else if (modec == 'o')
        mode = OP_PENDING;                      /* :omap */
    else
    {
        --p;
        if (forceit)
            mode = INSERT + CMDLINE;            /* :map ! */
        else
            mode = VISUAL + SELECTMODE + NORMAL + OP_PENDING;/* :map */
    }

    *cmdp = p;
    return mode;
}

/*
 * Clear all mappings or abbreviations.
 * 'abbr' should be FALSE for mappings, TRUE for abbreviations.
 */
/*ARGSUSED*/
    void
map_clear(cmdp, arg, forceit, abbr)
    char_u      *cmdp;
    char_u      *arg;
    int         forceit;
    int         abbr;
{
    int         mode;
#ifdef FEAT_LOCALMAP
    int         local;

    local = (STRCMP(arg, "<buffer>") == 0);
    if (!local && *arg != NUL)
    {
        EMSG(_(e_invarg));
        return;
    }
#endif

    mode = get_map_mode(&cmdp, forceit);
    map_clear_int(curbuf, mode,
#ifdef FEAT_LOCALMAP
            local,
#else
            FALSE,
#endif
            abbr);
}

/*
 * Clear all mappings in "mode".
 */
/*ARGSUSED*/
    void
map_clear_int(buf, mode, local, abbr)
    buf_T       *buf;       /* buffer for local mappings */
    int         mode;       /* mode in which to delete */
    int         local;      /* TRUE for buffer-local mappings */
    int         abbr;       /* TRUE for abbreviations */
{
    mapblock_T  *mp, **mpp;
    int         hash;
    int         new_hash;

    validate_maphash();

    for (hash = 0; hash < 256; ++hash)
    {
        if (abbr)
        {
            if (hash > 0)       /* there is only one abbrlist */
                break;
#ifdef FEAT_LOCALMAP
            if (local)
                mpp = &buf->b_first_abbr;
            else
#endif
                mpp = &first_abbr;
        }
        else
        {
#ifdef FEAT_LOCALMAP
            if (local)
                mpp = &buf->b_maphash[hash];
            else
#endif
                mpp = &maphash[hash];
        }
        while (*mpp != NULL)
        {
            mp = *mpp;
            if (mp->m_mode & mode)
            {
                mp->m_mode &= ~mode;
                if (mp->m_mode == 0) /* entry can be deleted */
                {
                    map_free(mpp);
                    continue;
                }
                /*
                 * May need to put this entry into another hash list.
                 */
                new_hash = MAP_HASH(mp->m_mode, mp->m_keys[0]);
                if (!abbr && new_hash != hash)
                {
                    *mpp = mp->m_next;
#ifdef FEAT_LOCALMAP
                    if (local)
                    {
                        mp->m_next = buf->b_maphash[new_hash];
                        buf->b_maphash[new_hash] = mp;
                    }
                    else
#endif
                    {
                        mp->m_next = maphash[new_hash];
                        maphash[new_hash] = mp;
                    }
                    continue;           /* continue with *mpp */
                }
            }
            mpp = &(mp->m_next);
        }
    }
}

    static void
showmap(mp, local)
    mapblock_T  *mp;
    int         local;      /* TRUE for buffer-local map */
{
    int len = 1;

    if (msg_didout || msg_silent != 0)
        msg_putchar('\n');
    if ((mp->m_mode & (INSERT + CMDLINE)) == INSERT + CMDLINE)
        msg_putchar('!');                       /* :map! */
    else if (mp->m_mode & INSERT)
        msg_putchar('i');                       /* :imap */
    else if (mp->m_mode & LANGMAP)
        msg_putchar('l');                       /* :lmap */
    else if (mp->m_mode & CMDLINE)
        msg_putchar('c');                       /* :cmap */
    else if ((mp->m_mode & (NORMAL + VISUAL + SELECTMODE + OP_PENDING))
                                 == NORMAL + VISUAL + SELECTMODE + OP_PENDING)
        msg_putchar(' ');                       /* :map */
    else
    {
        len = 0;
        if (mp->m_mode & NORMAL)
        {
            msg_putchar('n');           /* :nmap */
            ++len;
        }
        if (mp->m_mode & OP_PENDING)
        {
            msg_putchar('o');           /* :omap */
            ++len;
        }
        if ((mp->m_mode & (VISUAL + SELECTMODE)) == VISUAL + SELECTMODE)
        {
            msg_putchar('v');           /* :vmap */
            ++len;
        }
        else
        {
            if (mp->m_mode & VISUAL)
            {
                msg_putchar('x');               /* :xmap */
                ++len;
            }
            if (mp->m_mode & SELECTMODE)
            {
                msg_putchar('s');               /* :smap */
                ++len;
            }
        }
    }
    while (++len <= 3)
        msg_putchar(' ');

    /* Get length of what we write */
    len = msg_outtrans_special(mp->m_keys, TRUE);
    do
    {
        msg_putchar(' ');               /* padd with blanks */
        ++len;
    } while (len < 12);

    if (mp->m_noremap == REMAP_NONE)
        msg_puts_attr((char_u *)"*", hl_attr(HLF_8));
    else if (mp->m_noremap == REMAP_SCRIPT)
        msg_puts_attr((char_u *)"&", hl_attr(HLF_8));
    else
        msg_putchar(' ');

    if (local)
        msg_putchar('@');
    else
        msg_putchar(' ');

    /* Use FALSE below if we only want things like <Up> to show up as such on
     * the rhs, and not M-x etc, TRUE gets both -- webb
     */
    if (*mp->m_str == NUL)
        msg_puts_attr((char_u *)"<Nop>", hl_attr(HLF_8));
    else
        msg_outtrans_special(mp->m_str, FALSE);
#ifdef FEAT_EVAL
    if (p_verbose > 0)
        last_set_msg(mp->m_script_ID);
#endif
    out_flush();                        /* show one line at a time */
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Return TRUE if a map exists that has "str" in the rhs for mode "modechars".
 * Recognize termcap codes in "str".
 * Also checks mappings local to the current buffer.
 */
    int
map_to_exists(str, modechars, abbr)
    char_u      *str;
    char_u      *modechars;
    int         abbr;
{
    int         mode = 0;
    char_u      *rhs;
    char_u      *buf;
    int         retval;

    rhs = replace_termcodes(str, &buf, FALSE, TRUE, FALSE);

    if (vim_strchr(modechars, 'n') != NULL)
        mode |= NORMAL;
    if (vim_strchr(modechars, 'v') != NULL)
        mode |= VISUAL + SELECTMODE;
    if (vim_strchr(modechars, 'x') != NULL)
        mode |= VISUAL;
    if (vim_strchr(modechars, 's') != NULL)
        mode |= SELECTMODE;
    if (vim_strchr(modechars, 'o') != NULL)
        mode |= OP_PENDING;
    if (vim_strchr(modechars, 'i') != NULL)
        mode |= INSERT;
    if (vim_strchr(modechars, 'l') != NULL)
        mode |= LANGMAP;
    if (vim_strchr(modechars, 'c') != NULL)
        mode |= CMDLINE;

    retval = map_to_exists_mode(rhs, mode, abbr);
    vim_free(buf);

    return retval;
}
#endif

/*
 * Return TRUE if a map exists that has "str" in the rhs for mode "mode".
 * Also checks mappings local to the current buffer.
 */
    int
map_to_exists_mode(rhs, mode, abbr)
    char_u      *rhs;
    int         mode;
    int         abbr;
{
    mapblock_T  *mp;
    int         hash;
# ifdef FEAT_LOCALMAP
    int         expand_buffer = FALSE;

    validate_maphash();

    /* Do it twice: once for global maps and once for local maps. */
    for (;;)
    {
# endif
        for (hash = 0; hash < 256; ++hash)
        {
            if (abbr)
            {
                if (hash > 0)           /* there is only one abbr list */
                    break;
#ifdef FEAT_LOCALMAP
                if (expand_buffer)
                    mp = curbuf->b_first_abbr;
                else
#endif
                    mp = first_abbr;
            }
# ifdef FEAT_LOCALMAP
            else if (expand_buffer)
                mp = curbuf->b_maphash[hash];
# endif
            else
                mp = maphash[hash];
            for (; mp; mp = mp->m_next)
            {
                if ((mp->m_mode & mode)
                        && strstr((char *)mp->m_str, (char *)rhs) != NULL)
                    return TRUE;
            }
        }
# ifdef FEAT_LOCALMAP
        if (expand_buffer)
            break;
        expand_buffer = TRUE;
    }
# endif

    return FALSE;
}

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)
/*
 * Used below when expanding mapping/abbreviation names.
 */
static int      expand_mapmodes = 0;
static int      expand_isabbrev = 0;
#ifdef FEAT_LOCALMAP
static int      expand_buffer = FALSE;
#endif

/*
 * Work out what to complete when doing command line completion of mapping
 * or abbreviation names.
 */
    char_u *
set_context_in_map_cmd(xp, cmd, arg, forceit, isabbrev, isunmap, cmdidx)
    expand_T    *xp;
    char_u      *cmd;
    char_u      *arg;
    int         forceit;        /* TRUE if '!' given */
    int         isabbrev;       /* TRUE if abbreviation */
    int         isunmap;        /* TRUE if unmap/unabbrev command */
    cmdidx_T    cmdidx;
{
    if (forceit && cmdidx != CMD_map && cmdidx != CMD_unmap)
        xp->xp_context = EXPAND_NOTHING;
    else
    {
        if (isunmap)
            expand_mapmodes = get_map_mode(&cmd, forceit || isabbrev);
        else
        {
            expand_mapmodes = INSERT + CMDLINE;
            if (!isabbrev)
                expand_mapmodes += VISUAL + SELECTMODE + NORMAL + OP_PENDING;
        }
        expand_isabbrev = isabbrev;
        xp->xp_context = EXPAND_MAPPINGS;
#ifdef FEAT_LOCALMAP
        expand_buffer = FALSE;
#endif
        for (;;)
        {
#ifdef FEAT_LOCALMAP
            if (STRNCMP(arg, "<buffer>", 8) == 0)
            {
                expand_buffer = TRUE;
                arg = skipwhite(arg + 8);
                continue;
            }
#endif
            if (STRNCMP(arg, "<unique>", 8) == 0)
            {
                arg = skipwhite(arg + 8);
                continue;
            }
            if (STRNCMP(arg, "<silent>", 8) == 0)
            {
                arg = skipwhite(arg + 8);
                continue;
            }
#ifdef FEAT_EVAL
            if (STRNCMP(arg, "<script>", 8) == 0)
            {
                arg = skipwhite(arg + 8);
                continue;
            }
            if (STRNCMP(arg, "<expr>", 6) == 0)
            {
                arg = skipwhite(arg + 6);
                continue;
            }
#endif
            break;
        }
        xp->xp_pattern = arg;
    }

    return NULL;
}

/*
 * Find all mapping/abbreviation names that match regexp 'prog'.
 * For command line expansion of ":[un]map" and ":[un]abbrev" in all modes.
 * Return OK if matches found, FAIL otherwise.
 */
    int
ExpandMappings(regmatch, num_file, file)
    regmatch_T  *regmatch;
    int         *num_file;
    char_u      ***file;
{
    mapblock_T  *mp;
    int         hash;
    int         count;
    int         round;
    char_u      *p;
    int         i;

    validate_maphash();

    *num_file = 0;                  /* return values in case of FAIL */
    *file = NULL;

    /*
     * round == 1: Count the matches.
     * round == 2: Build the array to keep the matches.
     */
    for (round = 1; round <= 2; ++round)
    {
        count = 0;

        for (i = 0; i < 5; ++i)
        {
            if (i == 0)
                p = (char_u *)"<silent>";
            else if (i == 1)
                p = (char_u *)"<unique>";
#ifdef FEAT_EVAL
            else if (i == 2)
                p = (char_u *)"<script>";
            else if (i == 3)
                p = (char_u *)"<expr>";
#endif
#ifdef FEAT_LOCALMAP
            else if (i == 4 && !expand_buffer)
                p = (char_u *)"<buffer>";
#endif
            else
                continue;

            if (vim_regexec(regmatch, p, (colnr_T)0))
            {
                if (round == 1)
                    ++count;
                else
                    (*file)[count++] = vim_strsave(p);
            }
        }

        for (hash = 0; hash < 256; ++hash)
        {
            if (expand_isabbrev)
            {
                if (hash > 0)   /* only one abbrev list */
                    break; /* for (hash) */
                mp = first_abbr;
            }
#ifdef FEAT_LOCALMAP
            else if (expand_buffer)
                mp = curbuf->b_maphash[hash];
#endif
            else
                mp = maphash[hash];
            for (; mp; mp = mp->m_next)
            {
                if (mp->m_mode & expand_mapmodes)
                {
                    p = translate_mapping(mp->m_keys, TRUE);
                    if (p != NULL && vim_regexec(regmatch, p, (colnr_T)0))
                    {
                        if (round == 1)
                            ++count;
                        else
                        {
                            (*file)[count++] = p;
                            p = NULL;
                        }
                    }
                    vim_free(p);
                }
            } /* for (mp) */
        } /* for (hash) */

        if (count == 0)                 /* no match found */
            break; /* for (round) */

        if (round == 1)
        {
            *file = (char_u **)alloc((unsigned)(count * sizeof(char_u *)));
            if (*file == NULL)
                return FAIL;
        }
    } /* for (round) */

    if (count > 1)
    {
        char_u  **ptr1;
        char_u  **ptr2;
        char_u  **ptr3;

        /* Sort the matches */
        sort_strings(*file, count);

        /* Remove multiple entries */
        ptr1 = *file;
        ptr2 = ptr1 + 1;
        ptr3 = ptr1 + count;

        while (ptr2 < ptr3)
        {
            if (STRCMP(*ptr1, *ptr2))
                *++ptr1 = *ptr2++;
            else
            {
                vim_free(*ptr2++);
                count--;
            }
        }
    }

    *num_file = count;
    return (count == 0 ? FAIL : OK);
}
#endif /* FEAT_CMDL_COMPL */

/*
 * Check for an abbreviation.
 * Cursor is at ptr[col]. When inserting, mincol is where insert started.
 * "c" is the character typed before check_abbr was called.  It may have
 * ABBR_OFF added to avoid prepending a CTRL-V to it.
 *
 * Historic vi practice: The last character of an abbreviation must be an id
 * character ([a-zA-Z0-9_]). The characters in front of it must be all id
 * characters or all non-id characters. This allows for abbr. "#i" to
 * "#include".
 *
 * Vim addition: Allow for abbreviations that end in a non-keyword character.
 * Then there must be white space before the abbr.
 *
 * return TRUE if there is an abbreviation, FALSE if not
 */
    int
check_abbr(c, ptr, col, mincol)
    int         c;
    char_u      *ptr;
    int         col;
    int         mincol;
{
    int         len;
    int         scol;           /* starting column of the abbr. */
    int         j;
    char_u      *s;
#ifdef FEAT_MBYTE
    char_u      tb[MB_MAXBYTES + 4];
#else
    char_u      tb[4];
#endif
    mapblock_T  *mp;
#ifdef FEAT_LOCALMAP
    mapblock_T  *mp2;
#endif
#ifdef FEAT_MBYTE
    int         clen = 0;       /* length in characters */
#endif
    int         is_id = TRUE;
    int         vim_abbr;

    if (typebuf.tb_no_abbr_cnt) /* abbrev. are not recursive */
        return FALSE;
    if ((KeyNoremap & (RM_NONE|RM_SCRIPT)) != 0)
        /* no remapping implies no abbreviation */
        return FALSE;

    /*
     * Check for word before the cursor: If it ends in a keyword char all
     * chars before it must be al keyword chars or non-keyword chars, but not
     * white space. If it ends in a non-keyword char we accept any characters
     * before it except white space.
     */
    if (col == 0)                               /* cannot be an abbr. */
        return FALSE;

#ifdef FEAT_MBYTE
    if (has_mbyte)
    {
        char_u *p;

        p = mb_prevptr(ptr, ptr + col);
        if (!vim_iswordp(p))
            vim_abbr = TRUE;                    /* Vim added abbr. */
        else
        {
            vim_abbr = FALSE;                   /* vi compatible abbr. */
            if (p > ptr)
                is_id = vim_iswordp(mb_prevptr(ptr, p));
        }
        clen = 1;
        while (p > ptr + mincol)
        {
            p = mb_prevptr(ptr, p);
            if (vim_isspace(*p) || (!vim_abbr && is_id != vim_iswordp(p)))
            {
                p += (*mb_ptr2len)(p);
                break;
            }
            ++clen;
        }
        scol = (int)(p - ptr);
    }
    else
#endif
    {
        if (!vim_iswordc(ptr[col - 1]))
            vim_abbr = TRUE;                    /* Vim added abbr. */
        else
        {
            vim_abbr = FALSE;                   /* vi compatible abbr. */
            if (col > 1)
                is_id = vim_iswordc(ptr[col - 2]);
        }
        for (scol = col - 1; scol > 0 && !vim_isspace(ptr[scol - 1])
                && (vim_abbr || is_id == vim_iswordc(ptr[scol - 1])); --scol)
            ;
    }

    if (scol < mincol)
        scol = mincol;
    if (scol < col)             /* there is a word in front of the cursor */
    {
        ptr += scol;
        len = col - scol;
#ifdef FEAT_LOCALMAP
        mp = curbuf->b_first_abbr;
        mp2 = first_abbr;
        if (mp == NULL)
        {
            mp = mp2;
            mp2 = NULL;
        }
#else
        mp = first_abbr;
#endif
        for ( ; mp;
#ifdef FEAT_LOCALMAP
                mp->m_next == NULL ? (mp = mp2, mp2 = NULL) :
#endif
                (mp = mp->m_next))
        {
            /* find entries with right mode and keys */
            if (       (mp->m_mode & State)
                    && mp->m_keylen == len
                    && !STRNCMP(mp->m_keys, ptr, (size_t)len))
                break;
        }
        if (mp != NULL)
        {
            /*
             * Found a match:
             * Insert the rest of the abbreviation in typebuf.tb_buf[].
             * This goes from end to start.
             *
             * Characters 0x000 - 0x100: normal chars, may need CTRL-V,
             * except K_SPECIAL: Becomes K_SPECIAL KS_SPECIAL KE_FILLER
             * Characters where IS_SPECIAL() == TRUE: key codes, need
             * K_SPECIAL. Other characters (with ABBR_OFF): don't use CTRL-V.
             *
             * Character CTRL-] is treated specially - it completes the
             * abbreviation, but is not inserted into the input stream.
             */
            j = 0;
                                        /* special key code, split up */
            if (c != Ctrl_RSB)
            {
                if (IS_SPECIAL(c) || c == K_SPECIAL)
                {
                    tb[j++] = K_SPECIAL;
                    tb[j++] = K_SECOND(c);
                    tb[j++] = K_THIRD(c);
                }
                else
                {
                    if (c < ABBR_OFF && (c < ' ' || c > '~'))
                        tb[j++] = Ctrl_V;       /* special char needs CTRL-V */
#ifdef FEAT_MBYTE
                    if (has_mbyte)
                    {
                        /* if ABBR_OFF has been added, remove it here */
                        if (c >= ABBR_OFF)
                            c -= ABBR_OFF;
                        j += (*mb_char2bytes)(c, tb + j);
                    }
                    else
#endif
                        tb[j++] = c;
                }
                tb[j] = NUL;
                                        /* insert the last typed char */
                (void)ins_typebuf(tb, 1, 0, TRUE, mp->m_silent);
            }
#ifdef FEAT_EVAL
            if (mp->m_expr)
                s = eval_map_expr(mp->m_str);
            else
#endif
                s = mp->m_str;
            if (s != NULL)
            {
                                        /* insert the to string */
                (void)ins_typebuf(s, mp->m_noremap, 0, TRUE, mp->m_silent);
                                        /* no abbrev. for these chars */
                typebuf.tb_no_abbr_cnt += (int)STRLEN(s) + j + 1;
#ifdef FEAT_EVAL
                if (mp->m_expr)
                    vim_free(s);
#endif
            }

            tb[0] = Ctrl_H;
            tb[1] = NUL;
#ifdef FEAT_MBYTE
            if (has_mbyte)
                len = clen;     /* Delete characters instead of bytes */
#endif
            while (len-- > 0)           /* delete the from string */
                (void)ins_typebuf(tb, 1, 0, TRUE, mp->m_silent);
            return TRUE;
        }
    }
    return FALSE;
}

#ifdef FEAT_EVAL
/*
 * Evaluate the RHS of a mapping or abbreviations and take care of escaping
 * special characters.
 */
    static char_u *
eval_map_expr(str)
    char_u      *str;
{
    char_u      *res;
    char_u      *p;
    char_u      *save_cmd;
    pos_T       save_cursor;

    save_cmd = save_cmdline_alloc();
    if (save_cmd == NULL)
        return NULL;

    /* Forbid changing text or using ":normal" to avoid most of the bad side
     * effects.  Also restore the cursor position. */
    ++textlock;
#ifdef FEAT_EX_EXTRA
    ++ex_normal_lock;
#endif
    save_cursor = curwin->w_cursor;
    p = eval_to_string(str, NULL, FALSE);
    --textlock;
#ifdef FEAT_EX_EXTRA
    --ex_normal_lock;
#endif
    curwin->w_cursor = save_cursor;

    restore_cmdline_alloc(save_cmd);
    if (p == NULL)
        return NULL;
    res = vim_strsave_escape_csi(p);
    vim_free(p);

    return res;
}
#endif

/*
 * Copy "p" to allocated memory, escaping K_SPECIAL and CSI so that the result
 * can be put in the typeahead buffer.
 * Returns NULL when out of memory.
 */
    char_u *
vim_strsave_escape_csi(p)
    char_u *p;
{
    char_u      *res;
    char_u      *s, *d;

    /* Need a buffer to hold up to three times as much. */
    res = alloc((unsigned)(STRLEN(p) * 3) + 1);
    if (res != NULL)
    {
        d = res;
        for (s = p; *s != NUL; )
        {
            if (s[0] == K_SPECIAL && s[1] != NUL && s[2] != NUL)
            {
                /* Copy special key unmodified. */
                *d++ = *s++;
                *d++ = *s++;
                *d++ = *s++;
            }
            else
            {
                /* Add character, possibly multi-byte to destination, escaping
                 * CSI and K_SPECIAL. */
                d = add_char2buf(PTR2CHAR(s), d);
                mb_ptr_adv(s);
            }
        }
        *d = NUL;
    }
    return res;
}

/*
 * Remove escaping from CSI and K_SPECIAL characters.  Reverse of
 * vim_strsave_escape_csi().  Works in-place.
 */
    void
vim_unescape_csi(p)
    char_u *p;
{
    char_u      *s = p, *d = p;

    while (*s != NUL)
    {
        if (s[0] == K_SPECIAL && s[1] == KS_SPECIAL && s[2] == KE_FILLER)
        {
            *d++ = K_SPECIAL;
            s += 3;
        }
        else if ((s[0] == K_SPECIAL || s[0] == CSI)
                                   && s[1] == KS_EXTRA && s[2] == (int)KE_CSI)
        {
            *d++ = CSI;
            s += 3;
        }
        else
            *d++ = *s++;
    }
    *d = NUL;
}

/*
 * Write map commands for the current mappings to an .exrc file.
 * Return FAIL on error, OK otherwise.
 */
    int
makemap(fd, buf)
    FILE        *fd;
    buf_T       *buf;       /* buffer for local mappings or NULL */
{
    mapblock_T  *mp;
    char_u      c1, c2;
    char_u      *p;
    char        *cmd;
    int         abbr;
    int         hash;
    int         did_cpo = FALSE;
    int         i;

    validate_maphash();

    /*
     * Do the loop twice: Once for mappings, once for abbreviations.
     * Then loop over all map hash lists.
     */
    for (abbr = 0; abbr < 2; ++abbr)
        for (hash = 0; hash < 256; ++hash)
        {
            if (abbr)
            {
                if (hash > 0)           /* there is only one abbr list */
                    break;
#ifdef FEAT_LOCALMAP
                if (buf != NULL)
                    mp = buf->b_first_abbr;
                else
#endif
                    mp = first_abbr;
            }
            else
            {
#ifdef FEAT_LOCALMAP
                if (buf != NULL)
                    mp = buf->b_maphash[hash];
                else
#endif
                    mp = maphash[hash];
            }

            for ( ; mp; mp = mp->m_next)
            {
                /* skip script-local mappings */
                if (mp->m_noremap == REMAP_SCRIPT)
                    continue;

                /* skip mappings that contain a <SNR> (script-local thing),
                 * they probably don't work when loaded again */
                for (p = mp->m_str; *p != NUL; ++p)
                    if (p[0] == K_SPECIAL && p[1] == KS_EXTRA
                                                       && p[2] == (int)KE_SNR)
                        break;
                if (*p != NUL)
                    continue;

                c1 = NUL;
                c2 = NUL;
                if (abbr)
                    cmd = "abbr";
                else
                    cmd = "map";
                switch (mp->m_mode)
                {
                    case NORMAL + VISUAL + SELECTMODE + OP_PENDING:
                        break;
                    case NORMAL:
                        c1 = 'n';
                        break;
                    case VISUAL + SELECTMODE:
                        c1 = 'v';
                        break;
                    case VISUAL:
                        c1 = 'x';
                        break;
                    case SELECTMODE:
                        c1 = 's';
                        break;
                    case OP_PENDING:
                        c1 = 'o';
                        break;
                    case NORMAL + VISUAL + SELECTMODE:
                        c1 = 'n';
                        c2 = 'v';
                        break;
                    case VISUAL + SELECTMODE + OP_PENDING:
                        c1 = 'v';
                        c2 = 'o';
                        break;
                    case NORMAL + OP_PENDING:
                        c1 = 'n';
                        c2 = 'o';
                        break;
                    case CMDLINE + INSERT:
                        if (!abbr)
                            cmd = "map!";
                        break;
                    case CMDLINE:
                        c1 = 'c';
                        break;
                    case INSERT:
                        c1 = 'i';
                        break;
                    case LANGMAP:
                        c1 = 'l';
                        break;
                    default:
                        EMSG(_("E228: makemap: Illegal mode"));
                        return FAIL;
                }
                do      /* may do this twice if c2 is set */
                {
                    /* When outputting <> form, need to make sure that 'cpo'
                     * is set to the Vim default. */
                    if (!did_cpo)
                    {
                        if (*mp->m_str == NUL)          /* will use <Nop> */
                            did_cpo = TRUE;
                        else
                            for (i = 0; i < 2; ++i)
                                for (p = (i ? mp->m_str : mp->m_keys); *p; ++p)
                                    if (*p == K_SPECIAL || *p == NL)
                                        did_cpo = TRUE;
                        if (did_cpo)
                        {
                            if (fprintf(fd, "let s:cpo_save=&cpo") < 0
                                    || put_eol(fd) < 0
                                    || fprintf(fd, "set cpo&vim") < 0
                                    || put_eol(fd) < 0)
                                return FAIL;
                        }
                    }
                    if (c1 && putc(c1, fd) < 0)
                        return FAIL;
                    if (mp->m_noremap != REMAP_YES && fprintf(fd, "nore") < 0)
                        return FAIL;
                    if (fprintf(fd, cmd) < 0)
                        return FAIL;
                    if (buf != NULL && fputs(" <buffer>", fd) < 0)
                        return FAIL;
                    if (mp->m_silent && fputs(" <silent>", fd) < 0)
                        return FAIL;
#ifdef FEAT_EVAL
                    if (mp->m_noremap == REMAP_SCRIPT
                                                 && fputs("<script>", fd) < 0)
                        return FAIL;
                    if (mp->m_expr && fputs(" <expr>", fd) < 0)
                        return FAIL;
#endif

                    if (       putc(' ', fd) < 0
                            || put_escstr(fd, mp->m_keys, 0) == FAIL
                            || putc(' ', fd) < 0
                            || put_escstr(fd, mp->m_str, 1) == FAIL
                            || put_eol(fd) < 0)
                        return FAIL;
                    c1 = c2;
                    c2 = NUL;
                }
                while (c1);
            }
        }

    if (did_cpo)
        if (fprintf(fd, "let &cpo=s:cpo_save") < 0
                || put_eol(fd) < 0
                || fprintf(fd, "unlet s:cpo_save") < 0
                || put_eol(fd) < 0)
            return FAIL;
    return OK;
}

/*
 * write escape string to file
 * "what": 0 for :map lhs, 1 for :map rhs, 2 for :set
 *
 * return FAIL for failure, OK otherwise
 */
    int
put_escstr(fd, strstart, what)
    FILE        *fd;
    char_u      *strstart;
    int         what;
{
    char_u      *str = strstart;
    int         c;
    int         modifiers;

    /* :map xx <Nop> */
    if (*str == NUL && what == 1)
    {
        if (fprintf(fd, "<Nop>") < 0)
            return FAIL;
        return OK;
    }

    for ( ; *str != NUL; ++str)
    {
#ifdef FEAT_MBYTE
        char_u  *p;

        /* Check for a multi-byte character, which may contain escaped
         * K_SPECIAL and CSI bytes */
        p = mb_unescape(&str);
        if (p != NULL)
        {
            while (*p != NUL)
                if (fputc(*p++, fd) < 0)
                    return FAIL;
            --str;
            continue;
        }
#endif

        c = *str;
        /*
         * Special key codes have to be translated to be able to make sense
         * when they are read back.
         */
        if (c == K_SPECIAL && what != 2)
        {
            modifiers = 0x0;
            if (str[1] == KS_MODIFIER)
            {
                modifiers = str[2];
                str += 3;
                c = *str;
            }
            if (c == K_SPECIAL)
            {
                c = TO_SPECIAL(str[1], str[2]);
                str += 2;
            }
            if (IS_SPECIAL(c) || modifiers)     /* special key */
            {
                if (fprintf(fd, (char *)get_special_key_name(c, modifiers)) < 0)
                    return FAIL;
                continue;
            }
        }

        /*
         * A '\n' in a map command should be written as <NL>.
         * A '\n' in a set command should be written as \^V^J.
         */
        if (c == NL)
        {
            if (what == 2)
            {
                if (fprintf(fd, IF_EB("\\\026\n", "\\" CTRL_V_STR "\n")) < 0)
                    return FAIL;
            }
            else
            {
                if (fprintf(fd, "<NL>") < 0)
                    return FAIL;
            }
            continue;
        }

        /*
         * Some characters have to be escaped with CTRL-V to
         * prevent them from misinterpreted in DoOneCmd().
         * A space, Tab and '"' has to be escaped with a backslash to
         * prevent it to be misinterpreted in do_set().
         * A space has to be escaped with a CTRL-V when it's at the start of a
         * ":map" rhs.
         * A '<' has to be escaped with a CTRL-V to prevent it being
         * interpreted as the start of a special key name.
         * A space in the lhs of a :map needs a CTRL-V.
         */
        if (what == 2 && (vim_iswhite(c) || c == '"' || c == '\\'))
        {
            if (putc('\\', fd) < 0)
                return FAIL;
        }
        else if (c < ' ' || c > '~' || c == '|'
                || (what == 0 && c == ' ')
                || (what == 1 && str == strstart && c == ' ')
                || (what != 2 && c == '<'))
        {
            if (putc(Ctrl_V, fd) < 0)
                return FAIL;
        }
        if (putc(c, fd) < 0)
            return FAIL;
    }
    return OK;
}

/*
 * Check all mappings for the presence of special key codes.
 * Used after ":set term=xxx".
 */
    void
check_map_keycodes()
{
    mapblock_T  *mp;
    char_u      *p;
    int         i;
    char_u      buf[3];
    char_u      *save_name;
    int         abbr;
    int         hash;
#ifdef FEAT_LOCALMAP
    buf_T       *bp;
#endif

    validate_maphash();
    save_name = sourcing_name;
    sourcing_name = (char_u *)"mappings"; /* avoids giving error messages */

#ifdef FEAT_LOCALMAP
    /* This this once for each buffer, and then once for global
     * mappings/abbreviations with bp == NULL */
    for (bp = firstbuf; ; bp = bp->b_next)
    {
#endif
        /*
         * Do the loop twice: Once for mappings, once for abbreviations.
         * Then loop over all map hash lists.
         */
        for (abbr = 0; abbr <= 1; ++abbr)
            for (hash = 0; hash < 256; ++hash)
            {
                if (abbr)
                {
                    if (hash)       /* there is only one abbr list */
                        break;
#ifdef FEAT_LOCALMAP
                    if (bp != NULL)
                        mp = bp->b_first_abbr;
                    else
#endif
                        mp = first_abbr;
                }
                else
                {
#ifdef FEAT_LOCALMAP
                    if (bp != NULL)
                        mp = bp->b_maphash[hash];
                    else
#endif
                        mp = maphash[hash];
                }
                for ( ; mp != NULL; mp = mp->m_next)
                {
                    for (i = 0; i <= 1; ++i)    /* do this twice */
                    {
                        if (i == 0)
                            p = mp->m_keys;     /* once for the "from" part */
                        else
                            p = mp->m_str;      /* and once for the "to" part */
                        while (*p)
                        {
                            if (*p == K_SPECIAL)
                            {
                                ++p;
                                if (*p < 128)   /* for "normal" tcap entries */
                                {
                                    buf[0] = p[0];
                                    buf[1] = p[1];
                                    buf[2] = NUL;
                                    (void)add_termcap_entry(buf, FALSE);
                                }
                                ++p;
                            }
                            ++p;
                        }
                    }
                }
            }
#ifdef FEAT_LOCALMAP
        if (bp == NULL)
            break;
    }
#endif
    sourcing_name = save_name;
}

#ifdef FEAT_EVAL
/*
 * Check the string "keys" against the lhs of all mappings
 * Return pointer to rhs of mapping (mapblock->m_str)
 * NULL otherwise
 */
    char_u *
check_map(keys, mode, exact, ign_mod, abbr)
    char_u      *keys;
    int         mode;
    int         exact;          /* require exact match */
    int         ign_mod;        /* ignore preceding modifier */
    int         abbr;           /* do abbreviations */
{
    int         hash;
    int         len, minlen;
    mapblock_T  *mp;
    char_u      *s;
#ifdef FEAT_LOCALMAP
    int         local;
#endif

    validate_maphash();

    len = (int)STRLEN(keys);
#ifdef FEAT_LOCALMAP
    for (local = 1; local >= 0; --local)
#endif
        /* loop over all hash lists */
        for (hash = 0; hash < 256; ++hash)
        {
            if (abbr)
            {
                if (hash > 0)           /* there is only one list. */
                    break;
#ifdef FEAT_LOCALMAP
                if (local)
                    mp = curbuf->b_first_abbr;
                else
#endif
                    mp = first_abbr;
            }
#ifdef FEAT_LOCALMAP
            else if (local)
                mp = curbuf->b_maphash[hash];
#endif
            else
                mp = maphash[hash];
            for ( ; mp != NULL; mp = mp->m_next)
            {
                /* skip entries with wrong mode, wrong length and not matching
                 * ones */
                if ((mp->m_mode & mode) && (!exact || mp->m_keylen == len))
                {
                    if (len > mp->m_keylen)
                        minlen = mp->m_keylen;
                    else
                        minlen = len;
                    s = mp->m_keys;
                    if (ign_mod && s[0] == K_SPECIAL && s[1] == KS_MODIFIER
                                                               && s[2] != NUL)
                    {
                        s += 3;
                        if (len > mp->m_keylen - 3)
                            minlen = mp->m_keylen - 3;
                    }
                    if (STRNCMP(s, keys, minlen) == 0)
                        return mp->m_str;
                }
            }
        }

    return NULL;
}
#endif

#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(MACOS)

#define VIS_SEL (VISUAL+SELECTMODE)     /* abbreviation */

/*
 * Default mappings for some often used keys.
 */
static struct initmap
{
    char_u      *arg;
    int         mode;
} initmappings[] =
{
#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
        /* Use the Windows (CUA) keybindings. */
# ifdef FEAT_GUI
#  if 0     /* These are now used to move tab pages */
        {(char_u *)"<C-PageUp> H", NORMAL+VIS_SEL},
        {(char_u *)"<C-PageUp> <C-O>H",INSERT},
        {(char_u *)"<C-PageDown> L$", NORMAL+VIS_SEL},
        {(char_u *)"<C-PageDown> <C-O>L<C-O>$", INSERT},
#  endif

        /* paste, copy and cut */
        {(char_u *)"<S-Insert> \"*P", NORMAL},
        {(char_u *)"<S-Insert> \"-d\"*P", VIS_SEL},
        {(char_u *)"<S-Insert> <C-R><C-O>*", INSERT+CMDLINE},
        {(char_u *)"<C-Insert> \"*y", VIS_SEL},
        {(char_u *)"<S-Del> \"*d", VIS_SEL},
        {(char_u *)"<C-Del> \"*d", VIS_SEL},
        {(char_u *)"<C-X> \"*d", VIS_SEL},
        /* Missing: CTRL-C (cancel) and CTRL-V (block selection) */
# else
#  if 0     /* These are now used to move tab pages */
        {(char_u *)"\316\204 H", NORMAL+VIS_SEL},    /* CTRL-PageUp is "H" */
        {(char_u *)"\316\204 \017H",INSERT},        /* CTRL-PageUp is "^OH"*/
        {(char_u *)"\316v L$", NORMAL+VIS_SEL},     /* CTRL-PageDown is "L$" */
        {(char_u *)"\316v \017L\017$", INSERT},     /* CTRL-PageDown ="^OL^O$"*/
#  endif
        {(char_u *)"\316w <C-Home>", NORMAL+VIS_SEL},
        {(char_u *)"\316w <C-Home>", INSERT+CMDLINE},
        {(char_u *)"\316u <C-End>", NORMAL+VIS_SEL},
        {(char_u *)"\316u <C-End>", INSERT+CMDLINE},

        /* paste, copy and cut */
#  ifdef FEAT_CLIPBOARD
#   ifdef DJGPP
        {(char_u *)"\316\122 \"*P", NORMAL},        /* SHIFT-Insert is "*P */
        {(char_u *)"\316\122 \"-d\"*P", VIS_SEL},    /* SHIFT-Insert is "-d"*P */
        {(char_u *)"\316\122 \022\017*", INSERT},  /* SHIFT-Insert is ^R^O* */
        {(char_u *)"\316\222 \"*y", VIS_SEL},       /* CTRL-Insert is "*y */
#    if 0 /* Shift-Del produces the same code as Del */
        {(char_u *)"\316\123 \"*d", VIS_SEL},       /* SHIFT-Del is "*d */
#    endif
        {(char_u *)"\316\223 \"*d", VIS_SEL},       /* CTRL-Del is "*d */
        {(char_u *)"\030 \"-d", VIS_SEL},           /* CTRL-X is "-d */
#   else
        {(char_u *)"\316\324 \"*P", NORMAL},        /* SHIFT-Insert is "*P */
        {(char_u *)"\316\324 \"-d\"*P", VIS_SEL},    /* SHIFT-Insert is "-d"*P */
        {(char_u *)"\316\324 \022\017*", INSERT},  /* SHIFT-Insert is ^R^O* */
        {(char_u *)"\316\325 \"*y", VIS_SEL},       /* CTRL-Insert is "*y */
        {(char_u *)"\316\327 \"*d", VIS_SEL},       /* SHIFT-Del is "*d */
        {(char_u *)"\316\330 \"*d", VIS_SEL},       /* CTRL-Del is "*d */
        {(char_u *)"\030 \"-d", VIS_SEL},           /* CTRL-X is "-d */
#   endif
#  else
        {(char_u *)"\316\324 P", NORMAL},           /* SHIFT-Insert is P */
        {(char_u *)"\316\324 \"-dP", VIS_SEL},      /* SHIFT-Insert is "-dP */
        {(char_u *)"\316\324 \022\017\"", INSERT}, /* SHIFT-Insert is ^R^O" */
        {(char_u *)"\316\325 y", VIS_SEL},          /* CTRL-Insert is y */
        {(char_u *)"\316\327 d", VIS_SEL},          /* SHIFT-Del is d */
        {(char_u *)"\316\330 d", VIS_SEL},          /* CTRL-Del is d */
#  endif
# endif
#endif

#if defined(MACOS)
        /* Use the Standard MacOS binding. */
        /* paste, copy and cut */
        {(char_u *)"<D-v> \"*P", NORMAL},
        {(char_u *)"<D-v> \"-d\"*P", VIS_SEL},
        {(char_u *)"<D-v> <C-R>*", INSERT+CMDLINE},
        {(char_u *)"<D-c> \"*y", VIS_SEL},
        {(char_u *)"<D-x> \"*d", VIS_SEL},
        {(char_u *)"<Backspace> \"-d", VIS_SEL},
#endif
};

# undef VIS_SEL
#endif

/*
 * Set up default mappings.
 */
    void
init_mappings()
{
#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(MACOS)
    int         i;

    for (i = 0; i < sizeof(initmappings) / sizeof(struct initmap); ++i)
        add_map(initmappings[i].arg, initmappings[i].mode);
#endif
}

#if defined(MSDOS) || defined(MSWIN) || defined(OS2) \
        || defined(FEAT_CMDWIN) || defined(MACOS) || defined(PROTO)
/*
 * Add a mapping "map" for mode "mode".
 * Need to put string in allocated memory, because do_map() will modify it.
 */
    void
add_map(map, mode)
    char_u      *map;
    int         mode;
{
    char_u      *s;
    char_u      *cpo_save = p_cpo;

    p_cpo = (char_u *)"";       /* Allow <> notation */
    s = vim_strsave(map);
    if (s != NULL)
    {
        (void)do_map(0, s, mode, FALSE);
        vim_free(s);
    }
    p_cpo = cpo_save;
}
#endif