1 /**************************************************************************** 2 * Copyright (c) 2002-2007,2008 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-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 1.17 2008/08/16 19:22:55 tom Exp $") 44 45 #if HAVE_MBTOWC && HAVE_MBLEN 46 #define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0) 47 #define count_mbytes(buffer,length,state) mblen(buffer,length) 48 #define check_mbytes(wch,buffer,length,state) \ 49 (int) mbtowc(&wch, buffer, length) 50 #define state_unused 51 #elif HAVE_MBRTOWC && HAVE_MBRLEN 52 #define reset_mbytes(state) init_mb(state) 53 #define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state) 54 #define check_mbytes(wch,buffer,length,state) \ 55 (int) mbrtowc(&wch, buffer, length, &state) 56 #else 57 make an error 58 #endif 59 60 NCURSES_EXPORT(int) 61 wget_wch(WINDOW *win, wint_t *result) 62 { 63 SCREEN *sp; 64 int code; 65 char buffer[(MB_LEN_MAX * 9) + 1]; /* allow some redundant shifts */ 66 int status; 67 size_t count = 0; 68 unsigned long value; 69 wchar_t wch; 70 #ifndef state_unused 71 mbstate_t state; 72 #endif 73 74 T((T_CALLED("wget_wch(%p)"), win)); 75 76 /* 77 * We can get a stream of single-byte characters and KEY_xxx codes from 78 * _nc_wgetch(), while we want to return a wide character or KEY_xxx code. 79 */ 80 _nc_lock_global(curses); 81 sp = _nc_screen_of(win); 82 if (sp != 0) { 83 for (;;) { 84 T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer))); 85 code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist 86 *) 0)); 87 if (code == ERR) { 88 break; 89 } else if (code == KEY_CODE_YES) { 90 /* 91 * If we were processing an incomplete multibyte character, 92 * return an error since we have a KEY_xxx code which 93 * interrupts it. For some cases, we could improve this by 94 * writing a new version of lib_getch.c(!), but it is not clear 95 * whether the improvement would be worth the effort. 96 */ 97 if (count != 0) { 98 _nc_ungetch(sp, (int) value); 99 code = ERR; 100 } 101 break; 102 } else if (count + 1 >= sizeof(buffer)) { 103 _nc_ungetch(sp, (int) value); 104 code = ERR; 105 break; 106 } else { 107 buffer[count++] = (char) UChar(value); 108 reset_mbytes(state); 109 status = count_mbytes(buffer, count, state); 110 if (status >= 0) { 111 reset_mbytes(state); 112 if (check_mbytes(wch, buffer, count, state) != status) { 113 code = ERR; /* the two calls should match */ 114 _nc_ungetch(sp, (int) value); 115 } 116 value = wch; 117 break; 118 } 119 } 120 } 121 } else { 122 code = ERR; 123 } 124 *result = value; 125 _nc_unlock_global(curses); 126 T(("result %#lo", value)); 127 returnCode(code); 128 } 129