release/src/router/libncurses/ncurses/widechar/lib_get_wstr.c

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey                                                *
  31  ****************************************************************************/
  32
  33 /*
  34 **      lib_get_wstr.c
  35 **
  36 **      The routine wgetn_wstr().
  37 **
  38 */
  39
  40 #include <curses.priv.h>
  41
  42 MODULE_ID("$Id: lib_get_wstr.c,v 1.12 2009/10/24 22:38:11 tom Exp $")
  43
  44 static int
  45 wadd_wint(WINDOW *win, wint_t *src)
  46 {
  47     cchar_t tmp;
  48     wchar_t wch[2];
  49
  50     wch[0] = (wchar_t) (*src);
  51     wch[1] = 0;
  52     setcchar(&tmp, wch, A_NORMAL, 0, NULL);
  53     return wadd_wch(win, &tmp);
  54 }
  55
  56 /*
  57  * This wipes out the last character, no matter whether it was a tab, control
  58  * or other character, and handles reverse wraparound.
  59  */
  60 static wint_t *
  61 WipeOut(WINDOW *win, int y, int x, wint_t *first, wint_t *last, bool echoed)
  62 {
  63     if (last > first) {
  64         *--last = '\0';
  65         if (echoed) {
  66             int y1 = win->_cury;
  67             int x1 = win->_curx;
  68             int n;
  69
  70             wmove(win, y, x);
  71             for (n = 0; first[n] != 0; ++n) {
  72                 wadd_wint(win, first + n);
  73             }
  74             getyx(win, y, x);
  75             while (win->_cury < y1
  76                    || (win->_cury == y1 && win->_curx < x1))
  77                 waddch(win, (chtype) ' ');
  78
  79             wmove(win, y, x);
  80         }
  81     }
  82     return last;
  83 }
  84
  85 NCURSES_EXPORT(int)
  86 wgetn_wstr(WINDOW *win, wint_t *str, int maxlen)
  87 {
  88     SCREEN *sp = _nc_screen_of(win);
  89     TTY buf;
  90     bool oldnl, oldecho, oldraw, oldcbreak;
  91     wint_t erasec;
  92     wint_t killc;
  93     wint_t *oldstr = str;
  94     wint_t *tmpstr = str;
  95     wint_t ch;
  96     int y, x, code;
  97
  98     T((T_CALLED("wgetn_wstr(%p,%p, %d)"), (void *) win, (void *) str, maxlen));
  99
 100     if (!win)
 101         returnCode(ERR);
 102
 103     _nc_get_tty_mode(&buf);
 104
 105     oldnl = sp->_nl;
 106     oldecho = sp->_echo;
 107     oldraw = sp->_raw;
 108     oldcbreak = sp->_cbreak;
 109     nl();
 110     noecho();
 111     noraw();
 112     cbreak();
 113
 114     erasec = (wint_t) erasechar();
 115     killc = (wint_t) killchar();
 116
 117     getyx(win, y, x);
 118
 119     if (is_wintouched(win) || (win->_flags & _HASMOVED))
 120         wrefresh(win);
 121
 122     while ((code = wget_wch(win, &ch)) != ERR) {
 123         /*
 124          * Map special characters into key-codes.
 125          */
 126         if (ch == '\r')
 127             ch = '\n';
 128         if (ch == '\n') {
 129             code = KEY_CODE_YES;
 130             ch = KEY_ENTER;
 131         }
 132         if (ch < KEY_MIN) {
 133             if (ch == erasec) {
 134                 ch = KEY_BACKSPACE;
 135                 code = KEY_CODE_YES;
 136             }
 137             if (ch == killc) {
 138                 ch = KEY_EOL;
 139                 code = KEY_CODE_YES;
 140             }
 141         }
 142         if (code == KEY_CODE_YES) {
 143             /*
 144              * Some terminals (the Wyse-50 is the most common) generate a \n
 145              * from the down-arrow key.  With this logic, it's the user's
 146              * choice whether to set kcud=\n for wget_wch(); terminating
 147              * *getn_wstr() with \n should work either way.
 148              */
 149             if (ch == KEY_DOWN || ch == KEY_ENTER) {
 150                 if (oldecho == TRUE
 151                     && win->_cury == win->_maxy
 152                     && win->_scroll)
 153                     wechochar(win, (chtype) '\n');
 154                 break;
 155             }
 156             if (ch == KEY_LEFT || ch == KEY_BACKSPACE) {
 157                 if (tmpstr > oldstr) {
 158                     tmpstr = WipeOut(win, y, x, oldstr, tmpstr, oldecho);
 159                 }
 160             } else if (ch == KEY_EOL) {
 161                 while (tmpstr > oldstr) {
 162                     tmpstr = WipeOut(win, y, x, oldstr, tmpstr, oldecho);
 163                 }
 164             } else {
 165                 beep();
 166             }
 167         } else if (maxlen >= 0 && tmpstr - oldstr >= maxlen) {
 168             beep();
 169         } else {
 170             *tmpstr++ = ch;
 171             *tmpstr = 0;
 172             if (oldecho == TRUE) {
 173                 int oldy = win->_cury;
 174
 175                 if (wadd_wint(win, tmpstr - 1) == ERR) {
 176                     /*
 177                      * We can't really use the lower-right corner for input,
 178                      * since it'll mess up bookkeeping for erases.
 179                      */
 180                     win->_flags &= ~_WRAPPED;
 181                     waddch(win, (chtype) ' ');
 182                     tmpstr = WipeOut(win, y, x, oldstr, tmpstr, oldecho);
 183                     continue;
 184                 } else if (win->_flags & _WRAPPED) {
 185                     /*
 186                      * If the last waddch forced a wrap & scroll, adjust our
 187                      * reference point for erasures.
 188                      */
 189                     if (win->_scroll
 190                         && oldy == win->_maxy
 191                         && win->_cury == win->_maxy) {
 192                         if (--y <= 0) {
 193                             y = 0;
 194                         }
 195                     }
 196                     win->_flags &= ~_WRAPPED;
 197                 }
 198                 wrefresh(win);
 199             }
 200         }
 201     }
 202
 203     win->_curx = 0;
 204     win->_flags &= ~_WRAPPED;
 205     if (win->_cury < win->_maxy)
 206         win->_cury++;
 207     wrefresh(win);
 208
 209     /* Restore with a single I/O call, to fix minor asymmetry between
 210      * raw/noraw, etc.
 211      */
 212     sp->_nl = oldnl;
 213     sp->_echo = oldecho;
 214     sp->_raw = oldraw;
 215     sp->_cbreak = oldcbreak;
 216
 217     (void) _nc_set_tty_mode(&buf);
 218
 219     *tmpstr = 0;
 220     if (code == ERR) {
 221         if (tmpstr == oldstr) {
 222             *tmpstr++ = WEOF;
 223             *tmpstr = 0;
 224         }
 225         returnCode(ERR);
 226     }
 227
 228     T(("wgetn_wstr returns %s", _nc_viswibuf(oldstr)));
 229
 230     returnCode(OK);
 231 }