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79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <ctype.h>
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#include <stddef.h>
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#include <stdlib.h>
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extern int _mb_shift; /* Defined in mbtowc.c. */
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/* Convert the string of multibyte characters in S to `wchar_t's in
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PWCS, writing no more than N. Return the number written,
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or (size_t) -1 if an invalid multibyte character is encountered. */
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size_t
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DEFUN(mbstowcs, (pwcs, s, n),
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register wchar_t *pwcs AND register CONST char *s AND register size_t n)
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{
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int save_shift;
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register size_t written = 0;
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/* Save the shift state. */
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save_shift = _mb_shift;
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/* Reset the shift state. */
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_mb_shift = 0;
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while (*s != '\0')
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{
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int len;
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if (isascii (*s))
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{
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*pwcs = (wchar_t) *s;
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len = 1;
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}
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else
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len = mbtowc (pwcs, s, n);
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if (len < 1)
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{
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/* Return an error. */
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written = (size_t) -1;
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break;
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}
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else
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{
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/* Multibyte character converted. */
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++pwcs;
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++written;
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s += len;
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n -= len;
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}
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}
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/* Terminate the string if it has space. */
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if (n > 0)
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*pwcs = (wchar_t) 0;
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/* Restore the old shift state. */
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_mb_shift = save_shift;
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/* Return how many we wrote (or maybe an error). */
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return written;
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}
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