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

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey 2002-on                                        *
  31  ****************************************************************************/
  32
  33 /*
  34 **      lib_get_wch.c
  35 **
  36 **      The routine get_wch().
  37 **
  38 */
  39
  40 #include <curses.priv.h>
  41 #include <ctype.h>
  42
  43 MODULE_ID("$Id: lib_get_wch.c,v 1.23 2011/05/28 23:00:29 tom Exp $")
  44
  45 NCURSES_EXPORT(int)
  46 wget_wch(WINDOW *win, wint_t *result)
  47 {
  48     SCREEN *sp;
  49     int code;
  50     char buffer[(MB_LEN_MAX * 9) + 1];  /* allow some redundant shifts */
  51     int status;
  52     size_t count = 0;
  53     int value = 0;
  54     wchar_t wch;
  55 #ifndef state_unused
  56     mbstate_t state;
  57 #endif
  58
  59     T((T_CALLED("wget_wch(%p)"), (void *) win));
  60
  61     /*
  62      * We can get a stream of single-byte characters and KEY_xxx codes from
  63      * _nc_wgetch(), while we want to return a wide character or KEY_xxx code.
  64      */
  65     _nc_lock_global(curses);
  66     sp = _nc_screen_of(win);
  67     if (sp != 0) {
  68         for (;;) {
  69             T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer)));
  70             code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist
  71                                                                *) 0));
  72             if (code == ERR) {
  73                 break;
  74             } else if (code == KEY_CODE_YES) {
  75                 /*
  76                  * If we were processing an incomplete multibyte character,
  77                  * return an error since we have a KEY_xxx code which
  78                  * interrupts it.  For some cases, we could improve this by
  79                  * writing a new version of lib_getch.c(!), but it is not clear
  80                  * whether the improvement would be worth the effort.
  81                  */
  82                 if (count != 0) {
  83                     safe_ungetch(SP_PARM, value);
  84                     code = ERR;
  85                 }
  86                 break;
  87             } else if (count + 1 >= sizeof(buffer)) {
  88                 safe_ungetch(SP_PARM, value);
  89                 code = ERR;
  90                 break;
  91             } else {
  92                 buffer[count++] = (char) UChar(value);
  93                 reset_mbytes(state);
  94                 status = count_mbytes(buffer, count, state);
  95                 if (status >= 0) {
  96                     reset_mbytes(state);
  97                     if (check_mbytes(wch, buffer, count, state) != status) {
  98                         code = ERR;     /* the two calls should match */
  99                         safe_ungetch(SP_PARM, value);
 100                     }
 101                     value = wch;
 102                     break;
 103                 }
 104             }
 105         }
 106     } else {
 107         code = ERR;
 108     }
 109
 110     if (result != 0)
 111         *result = (wint_t) value;
 112
 113     _nc_unlock_global(curses);
 114     T(("result %#o", value));
 115     returnCode(code);
 116 }