69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/* Copyright (C) 1991-2022 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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/* Internal state. */
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static mbstate_t state;
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/* Return the length of the multibyte character (if there is one)
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at S which is no longer than N characters.
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The ISO C standard says that the `mblen' function must not change
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the state of the `mbtowc' function. */
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int
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mblen (const char *s, size_t n)
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{
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int result;
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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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/* Reset the state. */
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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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/* According to the ISO C 89 standard this is the expected behaviour. */
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result = 0;
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else
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{
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memset (&state, '\0', sizeof state);
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result = __mbrtowc (NULL, 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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