69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include <gconv.h>
|
|
#include <wcsmbs/wcsmbsload.h>
|
|
|
|
|
|
/* Internal state. */
|
|
static mbstate_t state;
|
|
|
|
/* Return the length of the multibyte character (if there is one)
|
|
at S which is no longer than N characters.
|
|
The ISO C standard says that the `mblen' function must not change
|
|
the state of the `mbtowc' function. */
|
|
int
|
|
mblen (const char *s, size_t n)
|
|
{
|
|
int result;
|
|
|
|
/* If S is NULL the function has to return null or not null
|
|
depending on the encoding having a state depending encoding or
|
|
not. */
|
|
if (s == NULL)
|
|
{
|
|
const struct gconv_fcts *fcts;
|
|
|
|
/* Get the conversion functions. */
|
|
fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
|
|
|
|
/* Reset the state. */
|
|
memset (&state, '\0', sizeof state);
|
|
|
|
result = fcts->towc->__stateful;
|
|
}
|
|
else if (*s == '\0')
|
|
/* According to the ISO C 89 standard this is the expected behaviour. */
|
|
result = 0;
|
|
else
|
|
{
|
|
memset (&state, '\0', sizeof state);
|
|
|
|
result = __mbrtowc (NULL, s, n, &state);
|
|
|
|
/* The `mbrtowc' functions tell us more than we need. Fold the -1
|
|
and -2 result into -1. */
|
|
if (result < 0)
|
|
result = -1;
|
|
}
|
|
|
|
return result;
|
|
}
|