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[glibc.git] / stdlib / mbstowcs.c
blob7b9d84c259ea47a2b1194e806669d449d5268953
1 /* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <stdlib.h>
20 #include <wchar.h>
23 extern mbstate_t __no_r_state; /* Defined in mbtowc.c. */
25 /* Convert the string of multibyte characters in S to `wchar_t's in
26 PWCS, writing no more than N. Return the number written,
27 or (size_t) -1 if an invalid multibyte character is encountered.
29 Attention: this function should NEVER be intentionally used.
30 The interface is completely stupid. The state is shared between
31 all conversion functions. You should use instead the restartable
32 version `mbsrtowcs'. */
33 size_t
34 mbstowcs (wchar_t *pwcs, const char *s, size_t n)
36 mbstate_t save_shift = __no_r_state;
37 size_t written;
39 written = __mbsrtowcs (pwcs, &s, n, &__no_r_state);
41 /* Restore the old shift state. */
42 __no_r_state = save_shift;
44 /* Return how many we wrote (or maybe an error). */
45 return written;