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

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey 2002                                           *
  31  ****************************************************************************/
  32
  33 /*
  34 **      lib_unget_wch.c
  35 **
  36 **      The routine unget_wch().
  37 **
  38 */
  39
  40 #include <curses.priv.h>
  41
  42 MODULE_ID("$Id: lib_unget_wch.c,v 1.14 2010/07/24 11:35:21 tom Exp $")
  43
  44 /*
  45  * Wrapper for wcrtomb() which obtains the length needed for the given
  46  * wide-character 'source'.
  47  */
  48 NCURSES_EXPORT(size_t)
  49 _nc_wcrtomb(char *target, wchar_t source, mbstate_t * state)
  50 {
  51     int result;
  52
  53     if (target == 0) {
  54         wchar_t temp[2];
  55         const wchar_t *tempp = temp;
  56         temp[0] = source;
  57         temp[1] = 0;
  58         result = (int) wcsrtombs(NULL, &tempp, 0, state);
  59     } else {
  60         result = (int) wcrtomb(target, source, state);
  61     }
  62     if (!isEILSEQ(result) && (result == 0))
  63         result = 1;
  64     return (size_t) result;
  65 }
  66
  67 NCURSES_EXPORT(int)
  68 NCURSES_SP_NAME(unget_wch) (NCURSES_SP_DCLx const wchar_t wch)
  69 {
  70     int result = OK;
  71     mbstate_t state;
  72     size_t length;
  73     int n;
  74
  75     T((T_CALLED("unget_wch(%p, %#lx)"), (void *) SP_PARM, (unsigned long) wch));
  76
  77     init_mb(state);
  78     length = _nc_wcrtomb(0, wch, &state);
  79
  80     if (length != (size_t) (-1)
  81         && length != 0) {
  82         char *string;
  83
  84         if ((string = (char *) malloc(length)) != 0) {
  85             init_mb(state);
  86             /* ignore the result, since we already validated the character */
  87             IGNORE_RC((int) wcrtomb(string, wch, &state));
  88
  89             for (n = (int) (length - 1); n >= 0; --n) {
  90                 if (NCURSES_SP_NAME(ungetch) (NCURSES_SP_ARGx
  91                                               UChar(string[n])) !=OK) {
  92                     result = ERR;
  93                     break;
  94                 }
  95             }
  96             free(string);
  97         } else {
  98             result = ERR;
  99         }
 100     } else {
 101         result = ERR;
 102     }
 103
 104     returnCode(result);
 105 }
 106
 107 #if NCURSES_SP_FUNCS
 108 NCURSES_EXPORT(int)
 109 unget_wch(const wchar_t wch)
 110 {
 111     return NCURSES_SP_NAME(unget_wch) (CURRENT_SCREEN, wch);
 112 }
 113 #endif