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73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/* Copyright (C) 1991-2024 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <gconv.h>
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#include <wcsmbs/wcsmbsload.h>
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/* Convert the multibyte character at S, which is no longer
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than N characters, to its `wchar_t' representation, placing
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this n *PWC and returning its length.
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Attention: this function should NEVER be intentionally used.
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The interface is completely stupid. The state is shared between
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all conversion functions. You should use instead the restartable
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version `mbrtowc'. */
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int
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mbtowc (wchar_t *pwc, const char *s, size_t n)
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{
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int result;
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static mbstate_t state;
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/* If S is NULL the function has to return null or not null
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depending on the encoding having a state depending encoding or
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not. */
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if (s == NULL)
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{
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const struct gconv_fcts *fcts;
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/* Get the conversion functions. */
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fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
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/* This is an extension in the Unix standard which does not directly
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violate ISO C. */
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memset (&state, '\0', sizeof state);
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result = fcts->towc->__stateful;
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}
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else if (*s == '\0')
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{
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if (pwc != NULL)
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*pwc = L'\0';
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result = 0;
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}
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else
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{
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result = __mbrtowc (pwc, s, n, &state);
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/* The `mbrtowc' functions tell us more than we need. Fold the -1
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and -2 result into -1. */
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if (result < 0)
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result = -1;
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}
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return result;
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}
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