1 /**************************************************************************** 2 * Copyright (c) 2002-2010,2011 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 1.23 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 } 117