1 /**************************************************************************** 2 * Copyright 2020 Thomas E. Dickey * 3 * Copyright 2002-2011,2016 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30 /**************************************************************************** 31 * Author: Thomas E. Dickey 2002 * 32 ****************************************************************************/ 33 34 /* 35 ** lib_unget_wch.c 36 ** 37 ** The routine unget_wch(). 38 ** 39 */ 40 41 #include <curses.priv.h> 42 43 MODULE_ID("$Id: lib_unget_wch.c,v 1.17 2020/02/02 23:34:34 tom Exp $") 44 45 /* 46 * Wrapper for wcrtomb() which obtains the length needed for the given 47 * wide-character 'source'. 48 */ 49 NCURSES_EXPORT(size_t) 50 _nc_wcrtomb(char *target, wchar_t source, mbstate_t * state) 51 { 52 int result; 53 54 if (target == 0) { 55 wchar_t temp[2]; 56 const wchar_t *tempp = temp; 57 temp[0] = source; 58 temp[1] = 0; 59 result = (int) wcsrtombs(NULL, &tempp, (size_t) 0, state); 60 } else { 61 result = (int) wcrtomb(target, source, state); 62 } 63 if (!isEILSEQ(result) && (result == 0)) 64 result = 1; 65 return (size_t) result; 66 } 67 68 NCURSES_EXPORT(int) 69 NCURSES_SP_NAME(unget_wch) (NCURSES_SP_DCLx const wchar_t wch) 70 { 71 int result = OK; 72 mbstate_t state; 73 size_t length; 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 int n; 86 87 init_mb(state); 88 /* ignore the result, since we already validated the character */ 89 IGNORE_RC((int) wcrtomb(string, wch, &state)); 90 91 for (n = (int) (length - 1); n >= 0; --n) { 92 if (NCURSES_SP_NAME(ungetch) (NCURSES_SP_ARGx 93 UChar(string[n])) !=OK) { 94 result = ERR; 95 break; 96 } 97 } 98 free(string); 99 } else { 100 result = ERR; 101 } 102 } else { 103 result = ERR; 104 } 105 106 returnCode(result); 107 } 108 109 #if NCURSES_SP_FUNCS 110 NCURSES_EXPORT(int) 111 unget_wch(const wchar_t wch) 112 { 113 return NCURSES_SP_NAME(unget_wch) (CURRENT_SCREEN, wch); 114 } 115 #endif 116