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-on * 32 ****************************************************************************/ 33 34 /* 35 ** lib_get_wch.c 36 ** 37 ** The routine get_wch(). 38 ** 39 */ 40 41 #include <curses.priv.h> 42 #include <ctype.h> 43 44 MODULE_ID("$Id: lib_get_wch.c,v 1.25 2020/02/02 23:34:34 tom Exp $") 45 46 NCURSES_EXPORT(int) 47 wget_wch(WINDOW *win, wint_t *result) 48 { 49 SCREEN *sp; 50 int code; 51 int value = 0; 52 wchar_t wch; 53 #ifndef state_unused 54 mbstate_t state; 55 #endif 56 57 T((T_CALLED("wget_wch(%p)"), (void *) win)); 58 59 /* 60 * We can get a stream of single-byte characters and KEY_xxx codes from 61 * _nc_wgetch(), while we want to return a wide character or KEY_xxx code. 62 */ 63 _nc_lock_global(curses); 64 sp = _nc_screen_of(win); 65 66 if (sp != 0) { 67 size_t count = 0; 68 69 for (;;) { 70 char buffer[(MB_LEN_MAX * 9) + 1]; /* allow some redundant shifts */ 71 72 T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer))); 73 code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist 74 *) 0)); 75 if (code == ERR) { 76 break; 77 } else if (code == KEY_CODE_YES) { 78 /* 79 * If we were processing an incomplete multibyte character, 80 * return an error since we have a KEY_xxx code which 81 * interrupts it. For some cases, we could improve this by 82 * writing a new version of lib_getch.c(!), but it is not clear 83 * whether the improvement would be worth the effort. 84 */ 85 if (count != 0) { 86 safe_ungetch(SP_PARM, value); 87 code = ERR; 88 } 89 break; 90 } else if (count + 1 >= sizeof(buffer)) { 91 safe_ungetch(SP_PARM, value); 92 code = ERR; 93 break; 94 } else { 95 int status; 96 97 buffer[count++] = (char) UChar(value); 98 reset_mbytes(state); 99 status = count_mbytes(buffer, count, state); 100 if (status >= 0) { 101 reset_mbytes(state); 102 if (check_mbytes(wch, buffer, count, state) != status) { 103 code = ERR; /* the two calls should match */ 104 safe_ungetch(SP_PARM, value); 105 } 106 value = wch; 107 break; 108 } 109 } 110 } 111 } else { 112 code = ERR; 113 } 114 115 if (result != 0) 116 *result = (wint_t) value; 117 118 _nc_unlock_global(curses); 119 T(("result %#o", value)); 120 returnCode(code); 121 } 122