85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* Copyright (C) 1991, 1992, 1995 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 "../locale/localeinfo.h"
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#include <ctype.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Convert the `wchar_t' string in PWCS to a multibyte character string
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in S, writing no more than N characters. Return the number of bytes
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written, or (size_t) -1 if an invalid `wchar_t' was found. */
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size_t
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DEFUN(wcstombs, (s, pwcs, n),
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register char *s AND register CONST wchar_t *pwcs AND register size_t n)
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{
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#if 0
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register CONST mb_char *mb;
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register int shift = 0;
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#endif
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register size_t written = 0;
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register wchar_t w;
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while ((w = *pwcs++) != (wchar_t) '\0')
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{
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if (isascii (w))
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{
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/* A normal character. */
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*s++ = (unsigned char) w;
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--n;
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++written;
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}
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else
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{
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#if 1
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written = (size_t) -1;
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break;
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#else
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mb = &_ctype_info->mbchar->mb_chars[w + shift];
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if (mb->string == NULL || mb->len == 0)
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{
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written = (size_t) -1;
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break;
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}
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else if (mb->len > n)
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break;
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else
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{
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memcpy ((PTR) s, (CONST PTR) mb->string, mb->len);
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s += mb->len;
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n -= mb->len;
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written += mb->len;
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shift += mb->shift;
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}
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#endif
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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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*s = '\0';
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/* Return the number of characters written (or maybe an error). */
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return written;
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}
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