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73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
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/* 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 <localeinfo.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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#include <ctype.h>
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extern long int _mb_shift; /* Defined in mbtowc.c. */
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/* Convert WCHAR into its multibyte character representation,
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putting this in S and returning its length. */
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int
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DEFUN(wctomb, (s, wchar), register char *s AND wchar_t wchar)
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{
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register CONST mb_char *mb;
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if (_ctype_info->mbchar == NULL)
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mb = NULL;
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else
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mb = _ctype_info->mbchar->mb_chars;
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/* If S is NULL, just say if we're shifted or not. */
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if (s == NULL)
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return _mb_shift != 0;
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if (wchar == (wchar_t) '\0')
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{
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_mb_shift = 0;
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/* See ANSI 4.4.1.1, line 21. */
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if (s != NULL)
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*s = '\0';
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return 1;
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}
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else if (mb == NULL)
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{
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if ((wchar_t) (char) wchar == wchar && isascii ((char) wchar))
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{
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/* A normal ASCII character translates to itself. */
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if (s != NULL)
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*s = (char) wchar;
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return 1;
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}
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return -1;
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}
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mb += wchar + _mb_shift;
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if (mb->string == NULL || mb->len == 0)
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return -1;
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memcpy((PTR) s, (CONST PTR) mb->string, mb->len + 1);
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_mb_shift += mb->shift;
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return mb->len;
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}
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