libpam: Trim sources that create empty objects.

[dragonfly.git] / contrib / ncurses / progs / tabs.c

/****************************************************************************
 * Copyright (c) 2008-2013,2015 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Thomas E. Dickey                        2008                    *
 ****************************************************************************/

/*
 * tabs.c --  set terminal hard-tabstops
 */

#define USE_LIBTINFO
#include <progs.priv.h>

MODULE_ID("$Id: tabs.c,v 1.37 2015/07/04 21:14:42 tom Exp $")

static void usage(void) GCC_NORETURN;

static char *prg_name;
static int max_cols;

static void
failed(const char *s)
{
    perror(s);
    ExitProgram(EXIT_FAILURE);
}

static int
putch(int c)
{
    return putchar(c);
}

static void
do_tabs(int *tab_list)
{
    int last = 1;
    int stop;

    putchar('\r');
    while ((stop = *tab_list++) > 0) {
        if (last < stop) {
            while (last++ < stop) {
                if (last > max_cols)
                    break;
                putchar(' ');
            }
        }
        if (stop <= max_cols) {
            tputs(tparm(set_tab, stop), 1, putch);
            last = stop;
        } else {
            break;
        }
    }
    putchar('\r');
}

static int *
decode_tabs(const char *tab_list)
{
    int *result = typeCalloc(int, strlen(tab_list) + (unsigned) max_cols);
    int n = 0;
    int value = 0;
    int prior = 0;
    int ch;

    if (result == 0)
        failed("decode_tabs");

    while ((ch = *tab_list++) != '\0') {
        if (isdigit(UChar(ch))) {
            value *= 10;
            value += (ch - '0');
        } else if (ch == ',') {
            result[n] = value + prior;
            if (n > 0 && result[n] <= result[n - 1]) {
                fprintf(stderr,
                        "%s: tab-stops are not in increasing order: %d %d\n",
                        prg_name, value, result[n - 1]);
                free(result);
                result = 0;
                break;
            }
            ++n;
            value = 0;
            prior = 0;
        } else if (ch == '+') {
            if (n)
                prior = result[n - 1];
        }
    }

    if (result != 0) {
        /*
         * If there is only one value, then it is an option such as "-8".
         */
        if ((n == 0) && (value > 0)) {
            int step = value;
            value = 1;
            while (n < max_cols - 1) {
                result[n++] = value;
                value += step;
            }
        }

        /*
         * Add the last value, if any.
         */
        result[n++] = value + prior;
        result[n] = 0;
    }

    return result;
}

static void
print_ruler(int *tab_list)
{
    int last = 0;
    int stop;
    int n;

    /* first print a readable ruler */
    for (n = 0; n < max_cols; n += 10) {
        int ch = 1 + (n / 10);
        char buffer[20];
        _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer))
                    "----+----%c",
                    ((ch < 10)
                     ? (ch + '0')
                     : (ch + 'A' - 10)));
        printf("%.*s", ((max_cols - n) > 10) ? 10 : (max_cols - n), buffer);
    }
    putchar('\n');

    /* now, print '*' for each stop */
    for (n = 0, last = 0; (tab_list[n] > 0) && (last < max_cols); ++n) {
        stop = tab_list[n];
        while (++last < stop) {
            if (last <= max_cols) {
                putchar('-');
            } else {
                break;
            }
        }
        if (last <= max_cols) {
            putchar('*');
            last = stop;
        } else {
            break;
        }
    }
    while (++last <= max_cols)
        putchar('-');
    putchar('\n');
}

/*
 * Write an '*' on each tabstop, to demonstrate whether it lines up with the
 * ruler.
 */
static void
write_tabs(int *tab_list)
{
    int stop;

    while ((stop = *tab_list++) > 0 && stop <= max_cols) {
        fputs((stop == 1) ? "*" : "\t*", stdout);
    };
    /* also show a tab _past_ the stops */
    if (stop < max_cols)
        fputs("\t+", stdout);
    putchar('\n');
}

/*
 * Trim leading/trailing blanks, as well as blanks after a comma.
 * Convert embedded blanks to commas.
 */
static char *
trimmed_tab_list(const char *source)
{
    char *result = strdup(source);
    int ch, j, k, last;

    if (result != 0) {
        for (j = k = last = 0; result[j] != 0; ++j) {
            ch = UChar(result[j]);
            if (isspace(ch)) {
                if (last == '\0') {
                    continue;
                } else if (isdigit(last) || last == ',') {
                    ch = ',';
                }
            } else if (ch == ',') {
                ;
            } else {
                if (last == ',')
                    result[k++] = (char) last;
                result[k++] = (char) ch;
            }
            last = ch;
        }
        result[k] = '\0';
    }
    return result;
}

static bool
comma_is_needed(const char *source)
{
    bool result = FALSE;

    if (source != 0) {
        size_t len = strlen(source);
        if (len != 0)
            result = (source[len - 1] != ',');
    } else {
        result = FALSE;
    }
    return result;
}

/*
 * Add a command-line parameter to the tab-list.  It can be blank- or comma-
 * separated (or a mixture).  For simplicity, empty tabs are ignored, e.g.,
 *      tabs 1,,6,11
 *      tabs 1,6,11
 * are treated the same.
 */
static const char *
add_to_tab_list(char **append, const char *value)
{
    char *result = *append;
    char *copied = trimmed_tab_list(value);

    if (copied != 0 && *copied != '\0') {
        const char *comma = ",";
        size_t need = 1 + strlen(copied);

        if (*copied == ',')
            comma = "";
        else if (!comma_is_needed(*append))
            comma = "";

        need += strlen(comma);
        if (*append != 0)
            need += strlen(*append);

        result = malloc(need);
        if (result == 0)
            failed("add_to_tab_list");

        *result = '\0';
        if (*append != 0) {
            _nc_STRCPY(result, *append, need);
            free(*append);
        }
        _nc_STRCAT(result, comma, need);
        _nc_STRCAT(result, copied, need);

        *append = result;
    }
    free(copied);
    return result;
}

/*
 * Check for illegal characters in the tab-list.
 */
static bool
legal_tab_list(const char *tab_list)
{
    bool result = TRUE;

    if (tab_list != 0 && *tab_list != '\0') {
        if (comma_is_needed(tab_list)) {
            int n, ch;
            for (n = 0; tab_list[n] != '\0'; ++n) {
                ch = UChar(tab_list[n]);
                if (!(isdigit(ch) || ch == ',' || ch == '+')) {
                    fprintf(stderr,
                            "%s: unexpected character found '%c'\n",
                            prg_name, ch);
                    result = FALSE;
                    break;
                }
            }
        } else {
            fprintf(stderr, "%s: trailing comma found '%s'\n", prg_name, tab_list);
            result = FALSE;
        }
    } else {
        fprintf(stderr, "%s: no tab-list given\n", prg_name);
        result = FALSE;
    }
    return result;
}

static char *
skip_list(char *value)
{
    while (*value != '\0' &&
           (isdigit(UChar(*value)) ||
            isspace(UChar(*value)) ||
            strchr("+,", UChar(*value)) != 0)) {
        ++value;
    }
    return value;
}

static void
usage(void)
{
#define DATA(s) s "\n"
    static const char msg[] =
    {
        DATA("Usage: tabs [options] [tabstop-list]")
        DATA("")
        DATA("Options:")
        DATA("  -0       reset tabs")
        DATA("  -8       set tabs to standard interval")
        DATA("  -a       Assembler, IBM S/370, first format")
        DATA("  -a2      Assembler, IBM S/370, second format")
        DATA("  -c       COBOL, normal format")
        DATA("  -c2      COBOL compact format")
        DATA("  -c3      COBOL compact format extended")
        DATA("  -d       debug (show ruler with expected/actual tab positions)")
        DATA("  -f       FORTRAN")
        DATA("  -n       no-op (do not modify terminal settings)")
        DATA("  -p       PL/I")
        DATA("  -s       SNOBOL")
        DATA("  -u       UNIVAC 1100 Assembler")
        DATA("  -T name  use terminal type 'name'")
        DATA("  -V       print version")
        DATA("")
        DATA("A tabstop-list is an ordered list of column numbers, e.g., 1,11,21")
        DATA("or 1,+10,+10 which is the same.")
    };
#undef DATA

    fflush(stdout);
    fputs(msg, stderr);
    ExitProgram(EXIT_FAILURE);
}

int
main(int argc, char *argv[])
{
    int rc = EXIT_FAILURE;
    bool debug = FALSE;
    bool no_op = FALSE;
    int n, ch;
    NCURSES_CONST char *term_name = 0;
    char *append = 0;
    const char *tab_list = 0;

    prg_name = _nc_rootname(argv[0]);

    if ((term_name = getenv("TERM")) == 0)
        term_name = "ansi+tabs";

    /* cannot use getopt, since some options are two-character */
    for (n = 1; n < argc; ++n) {
        char *option = argv[n];
        switch (option[0]) {
        case '-':
            while ((ch = *++option) != '\0') {
                switch (ch) {
                case 'a':
                    switch (*++option) {
                    default:
                    case '\0':
                        tab_list = "1,10,16,36,72";
                        option--;
                        /* Assembler, IBM S/370, first format */
                        break;
                    case '2':
                        tab_list = "1,10,16,40,72";
                        /* Assembler, IBM S/370, second format */
                        break;
                    }
                    break;
                case 'c':
                    switch (*++option) {
                    default:
                    case '\0':
                        tab_list = "1,8,12,16,20,55";
                        option--;
                        /* COBOL, normal format */
                        break;
                    case '2':
                        tab_list = "1,6,10,14,49";
                        /* COBOL compact format */
                        break;
                    case '3':
                        tab_list = "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67";
                        /* COBOL compact format extended */
                        break;
                    }
                    break;
                case 'd':       /* ncurses extension */
                    debug = TRUE;
                    break;
                case 'f':
                    tab_list = "1,7,11,15,19,23";
                    /* FORTRAN */
                    break;
                case 'n':       /* ncurses extension */
                    no_op = TRUE;
                    break;
                case 'p':
                    tab_list = "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61";
                    /* PL/I */
                    break;
                case 's':
                    tab_list = "1,10,55";
                    /* SNOBOL */
                    break;
                case 'u':
                    tab_list = "1,12,20,44";
                    /* UNIVAC 1100 Assembler */
                    break;
                case 'T':
                    ++n;
                    if (*++option != '\0') {
                        term_name = option;
                    } else {
                        term_name = argv[n++];
                        option--;
                    }
                    option += ((int) strlen(option)) - 1;
                    continue;
                case 'V':
                    puts(curses_version());
                    ExitProgram(EXIT_SUCCESS);
                default:
                    if (isdigit(UChar(*option))) {
                        char *copy = strdup(option);
                        *skip_list(copy) = '\0';
                        tab_list = copy;
                        option = skip_list(option) - 1;
                    } else {
                        usage();
                    }
                    break;
                }
            }
            break;
        case '+':
            while ((ch = *++option) != '\0') {
                switch (ch) {
                case 'm':
                    /*
                     * The "+mXXX" option is unimplemented because only the long-obsolete
                     * att510d implements smgl, which is needed to support
                     * this option.
                     */
                    break;
                default:
                    /* special case of relative stops separated by spaces? */
                    if (option == argv[n] + 1) {
                        tab_list = add_to_tab_list(&append, argv[n]);
                    }
                    break;
                }
            }
            break;
        default:
            if (append != 0) {
                if (tab_list != (const char *) append) {
                    /* one of the predefined options was used */
                    free(append);
                    append = 0;
                }
            }
            tab_list = add_to_tab_list(&append, option);
            break;
        }
    }

    setupterm(term_name, STDOUT_FILENO, (int *) 0);

    max_cols = (columns > 0) ? columns : 80;

    if (!VALID_STRING(clear_all_tabs)) {
        fprintf(stderr,
                "%s: terminal type '%s' cannot reset tabs\n",
                prg_name, term_name);
    } else if (!VALID_STRING(set_tab)) {
        fprintf(stderr,
                "%s: terminal type '%s' cannot set tabs\n",
                prg_name, term_name);
    } else if (legal_tab_list(tab_list)) {
        int *list = decode_tabs(tab_list);

        if (!no_op)
            tputs(clear_all_tabs, 1, putch);

        if (list != 0) {
            if (!no_op)
                do_tabs(list);
            if (debug) {
                fflush(stderr);
                printf("tabs %s\n", tab_list);
                print_ruler(list);
                write_tabs(list);
            }
            free(list);
        } else if (debug) {
            fflush(stderr);
            printf("tabs %s\n", tab_list);
        }
        rc = EXIT_SUCCESS;
    }
    if (append != 0)
        free(append);
    ExitProgram(rc);
}