1 /**************************************************************************** 2 * Copyright (c) 2002-2003,2004 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 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 * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 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 1.7 2004/12/05 01:21:31 tom Exp $") 43 44 #ifdef linux 45 /* 46 * glibc's wcrtomb() function is broken - does not return the proper value 47 * when target is null (noted for glibc 2.3.2). This is a workaround. 48 */ 49 NCURSES_EXPORT(size_t) 50 _nc_wcrtomb(char *target, wchar_t source, mbstate_t * state) 51 { 52 if (target == 0) { 53 wchar_t temp[2]; 54 const wchar_t *tempp = temp; 55 temp[0] = source; 56 temp[1] = 0; 57 return wcsrtombs(NULL, &tempp, 0, state); 58 } 59 return wcrtomb(target, source, state); 60 } 61 #endif 62 63 NCURSES_EXPORT(int) 64 unget_wch(const wchar_t wch) 65 { 66 int result = OK; 67 mbstate_t state; 68 size_t length; 69 int n; 70 71 T((T_CALLED("unget_wch(%#lx)"), (unsigned long) wch)); 72 73 init_mb(state); 74 length = _nc_wcrtomb(0, wch, &state); 75 76 if (length != (size_t) (-1) 77 && length != 0) { 78 char *string; 79 80 if ((string = (char *) malloc(length)) != 0) { 81 init_mb(state); 82 wcrtomb(string, wch, &state); 83 84 for (n = (int) (length - 1); n >= 0; --n) { 85 if (ungetch(string[n]) != OK) { 86 result = ERR; 87 break; 88 } 89 } 90 free(string); 91 } else { 92 result = ERR; 93 } 94 } else { 95 result = ERR; 96 } 97 98 returnCode(result); 99 } 100