ncurses/base/lib_insch.c

   1 /****************************************************************************
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  11  *                                                                          *
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  13  * in all copies or substantial portions of the Software.                   *
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Sven Verdoolaege                                                *
  33  *     and: Thomas E. Dickey                                                *
  34  ****************************************************************************/
  35
  36 /*
  37 **      lib_insch.c
  38 **
  39 **      The routine winsch().
  40 **
  41 */
  42
  43 #include <curses.priv.h>
  44 #include <ctype.h>
  45
  46 MODULE_ID("$Id: lib_insch.c,v 1.25 2008/02/03 00:14:37 tom Exp $")
  47
  48 /*
  49  * Insert the given character, updating the current location to simplify
  50  * inserting a string.
  51  */
  52 NCURSES_EXPORT(int)
  53 _nc_insert_ch(WINDOW *win, chtype ch)
  54 {
  55     int code = OK;
  56     NCURSES_CH_T wch;
  57     int count;
  58     NCURSES_CONST char *s;
  59
  60     switch (ch) {
  61     case '\t':
  62         for (count = (TABSIZE - (win->_curx % TABSIZE)); count > 0; count--) {
  63             if ((code = _nc_insert_ch(win, ' ')) != OK)
  64                 break;
  65         }
  66         break;
  67     case '\n':
  68     case '\r':
  69     case '\b':
  70         SetChar2(wch, ch);
  71         _nc_waddch_nosync(win, wch);
  72         break;
  73     default:
  74         if (
  75 #if USE_WIDEC_SUPPORT
  76                WINDOW_EXT(win, addch_used) == 0 &&
  77 #endif
  78                is8bits(ChCharOf(ch)) &&
  79                isprint(ChCharOf(ch))) {
  80             if (win->_curx <= win->_maxx) {
  81                 struct ldat *line = &(win->_line[win->_cury]);
  82                 NCURSES_CH_T *end = &(line->text[win->_curx]);
  83                 NCURSES_CH_T *temp1 = &(line->text[win->_maxx]);
  84                 NCURSES_CH_T *temp2 = temp1 - 1;
  85
  86                 SetChar2(wch, ch);
  87
  88                 CHANGED_TO_EOL(line, win->_curx, win->_maxx);
  89                 while (temp1 > end)
  90                     *temp1-- = *temp2--;
  91
  92                 *temp1 = _nc_render(win, wch);
  93                 win->_curx++;
  94             }
  95         } else if (is8bits(ChCharOf(ch)) && iscntrl(ChCharOf(ch))) {
  96             s = unctrl(ChCharOf(ch));
  97             while (*s != '\0') {
  98                 code = _nc_insert_ch(win, ChAttrOf(ch) | UChar(*s));
  99                 if (code != OK)
 100                     break;
 101                 ++s;
 102             }
 103         }
 104 #if USE_WIDEC_SUPPORT
 105         else {
 106             /*
 107              * Handle multibyte characters here
 108              */
 109             SetChar2(wch, ch);
 110             wch = _nc_render(win, wch);
 111             count = _nc_build_wch(win, &wch);
 112             if (count > 0) {
 113                 code = wins_wch(win, &wch);
 114             } else if (count == -1) {
 115                 /* handle EILSEQ */
 116                 if (is8bits(ch)) {
 117                     s = unctrl(ChCharOf(ch));
 118                     while (*s != '\0') {
 119                         code = _nc_insert_ch(win, ChAttrOf(ch) | UChar(*s));
 120                         if (code != OK)
 121                             break;
 122                         ++s;
 123                     }
 124                 } else {
 125                     code = ERR;
 126                 }
 127             }
 128         }
 129 #endif
 130         break;
 131     }
 132     return code;
 133 }
 134
 135 NCURSES_EXPORT(int)
 136 winsch(WINDOW *win, chtype c)
 137 {
 138     NCURSES_SIZE_T oy;
 139     NCURSES_SIZE_T ox;
 140     int code = ERR;
 141
 142     T((T_CALLED("winsch(%p, %s)"), win, _tracechtype(c)));
 143
 144     if (win != 0) {
 145         oy = win->_cury;
 146         ox = win->_curx;
 147
 148         code = _nc_insert_ch(win, c);
 149
 150         win->_curx = ox;
 151         win->_cury = oy;
 152         _nc_synchook(win);
 153     }
 154     returnCode(code);
 155 }