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/* $OpenBSD: lib_get_wch.c,v 1.1 2010/09/06 17:26:17 nicm Exp $ */
/****************************************************************************
* 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 1.1 2010/09/06 17:26:17 nicm 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);
}
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