/**************************************************************************** * Copyright (c) 2002-2007,2008 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * * "Software"), to deal in the Software without restriction, including * * without limitation the rights to use, copy, modify, merge, publish, * * distribute, distribute with modifications, sublicense, and/or sell * * copies of the Software, and to permit persons to whom the Software is * * furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included * * in all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * * * Except as contained in this notice, the name(s) of the above copyright * * holders shall not be used in advertising or otherwise to promote the * * sale, use or other dealings in this Software without prior written * * authorization. * ****************************************************************************/ /**************************************************************************** * Author: Thomas E. Dickey 2002-on * ****************************************************************************/ /* ** lib_get_wch.c ** ** The routine get_wch(). ** */ #include <curses.priv.h> #include <ctype.h> MODULE_ID("$Id: lib_get_wch.c,v 1.17 2008/08/16 19:22:55 tom Exp $") #if HAVE_MBTOWC && HAVE_MBLEN #define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0) #define count_mbytes(buffer,length,state) mblen(buffer,length) #define check_mbytes(wch,buffer,length,state) \ (int) mbtowc(&wch, buffer, length) #define state_unused #elif HAVE_MBRTOWC && HAVE_MBRLEN #define reset_mbytes(state) init_mb(state) #define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state) #define check_mbytes(wch,buffer,length,state) \ (int) mbrtowc(&wch, buffer, length, &state) #else make an error #endif NCURSES_EXPORT(int) wget_wch(WINDOW *win, wint_t *result) { SCREEN *sp; int code; char buffer[(MB_LEN_MAX * 9) + 1]; /* allow some redundant shifts */ int status; size_t count = 0; unsigned long value; wchar_t wch; #ifndef state_unused mbstate_t state; #endif T((T_CALLED("wget_wch(%p)"), win)); /* * We can get a stream of single-byte characters and KEY_xxx codes from * _nc_wgetch(), while we want to return a wide character or KEY_xxx code. */ _nc_lock_global(curses); sp = _nc_screen_of(win); if (sp != 0) { for (;;) { T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer))); code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist *) 0)); if (code == ERR) { break; } else if (code == KEY_CODE_YES) { /* * If we were processing an incomplete multibyte character, * return an error since we have a KEY_xxx code which * interrupts it. For some cases, we could improve this by * writing a new version of lib_getch.c(!), but it is not clear * whether the improvement would be worth the effort. */ if (count != 0) { _nc_ungetch(sp, (int) value); code = ERR; } break; } else if (count + 1 >= sizeof(buffer)) { _nc_ungetch(sp, (int) value); code = ERR; break; } else { buffer[count++] = (char) UChar(value); reset_mbytes(state); status = count_mbytes(buffer, count, state); if (status >= 0) { reset_mbytes(state); if (check_mbytes(wch, buffer, count, state) != status) { code = ERR; /* the two calls should match */ _nc_ungetch(sp, (int) value); } value = wch; break; } } } } else { code = ERR; } *result = value; _nc_unlock_global(curses); T(("result %#lo", value)); returnCode(code); }