ncurses/base/lib_insch.c

   1 /****************************************************************************
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  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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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 1.32 2009/10/24 22:04:35 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(SCREEN *sp, WINDOW *win, chtype ch)
  54 {
  55     int code = OK;
  56     NCURSES_CH_T wch;
  57     int count;
  58     NCURSES_CONST char *s;
  59     int tabsize = (
  60 #if USE_REENTRANT
  61                       sp->_TABSIZE
  62 #else
  63                       TABSIZE
  64 #endif
  65     );
  66
  67     switch (ch) {
  68     case '\t':
  69         for (count = (tabsize - (win->_curx % tabsize)); count > 0; count--) {
  70             if ((code = _nc_insert_ch(sp, win, ' ')) != OK)
  71                 break;
  72         }
  73         break;
  74     case '\n':
  75     case '\r':
  76     case '\b':
  77         SetChar2(wch, ch);
  78         _nc_waddch_nosync(win, wch);
  79         break;
  80     default:
  81         if (
  82 #if USE_WIDEC_SUPPORT
  83                WINDOW_EXT(win, addch_used) == 0 &&
  84 #endif
  85                is8bits(ChCharOf(ch)) &&
  86                (isprint(ChCharOf(ch)) ||
  87                 (ChAttrOf(ch) & A_ALTCHARSET) ||
  88                 (sp != 0 && sp->_legacy_coding && !iscntrl(ChCharOf(ch))))) {
  89             if (win->_curx <= win->_maxx) {
  90                 struct ldat *line = &(win->_line[win->_cury]);
  91                 NCURSES_CH_T *end = &(line->text[win->_curx]);
  92                 NCURSES_CH_T *temp1 = &(line->text[win->_maxx]);
  93                 NCURSES_CH_T *temp2 = temp1 - 1;
  94
  95                 SetChar2(wch, ch);
  96
  97                 CHANGED_TO_EOL(line, win->_curx, win->_maxx);
  98                 while (temp1 > end)
  99                     *temp1-- = *temp2--;
 100
 101                 *temp1 = _nc_render(win, wch);
 102                 win->_curx++;
 103             }
 104         } else if (is8bits(ChCharOf(ch)) && iscntrl(ChCharOf(ch))) {
 105             s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx ChCharOf(ch));
 106             while (*s != '\0') {
 107                 code = _nc_insert_ch(sp, win, ChAttrOf(ch) | UChar(*s));
 108                 if (code != OK)
 109                     break;
 110                 ++s;
 111             }
 112         }
 113 #if USE_WIDEC_SUPPORT
 114         else {
 115             /*
 116              * Handle multibyte characters here
 117              */
 118             SetChar2(wch, ch);
 119             wch = _nc_render(win, wch);
 120             count = _nc_build_wch(win, &wch);
 121             if (count > 0) {
 122                 code = _nc_insert_wch(win, &wch);
 123             } else if (count == -1) {
 124                 /* handle EILSEQ */
 125                 if (is8bits(ch)) {
 126                     s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx ChCharOf(ch));
 127                     if (strlen(s) > 1) {
 128                         while (*s != '\0') {
 129                             code = _nc_insert_ch(sp, win,
 130                                                  ChAttrOf(ch) | UChar(*s));
 131                             if (code != OK)
 132                                 break;
 133                             ++s;
 134                         }
 135                     } else {
 136                         code = ERR;
 137                     }
 138                 } else {
 139                     code = ERR;
 140                 }
 141             }
 142         }
 143 #endif
 144         break;
 145     }
 146     return code;
 147 }
 148
 149 NCURSES_EXPORT(int)
 150 winsch(WINDOW *win, chtype c)
 151 {
 152     NCURSES_SIZE_T oy;
 153     NCURSES_SIZE_T ox;
 154     int code = ERR;
 155
 156     T((T_CALLED("winsch(%p, %s)"), (void *) win, _tracechtype(c)));
 157
 158     if (win != 0) {
 159         oy = win->_cury;
 160         ox = win->_curx;
 161
 162         code = _nc_insert_ch(_nc_screen_of(win), win, c);
 163
 164         win->_curx = ox;
 165         win->_cury = oy;
 166         _nc_synchook(win);
 167     }
 168     returnCode(code);
 169 }