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glibc/stdlib/mbtowc.c
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/* Copyright (C) 1991-2016 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> | |
/* Convert the multibyte character at S, which is no longer | |
than N characters, to its `wchar_t' representation, placing | |
this n *PWC and returning its length. | |
Attention: this function should NEVER be intentionally used. | |
The interface is completely stupid. The state is shared between | |
all conversion functions. You should use instead the restartable | |
version `mbrtowc'. */ | |
int | |
mbtowc (wchar_t *pwc, const char *s, size_t n) | |
{ | |
int result; | |
static mbstate_t state; | |
/* 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)); | |
/* This is an extension in the Unix standard which does not directly | |
violate ISO C. */ | |
memset (&state, '\0', sizeof state); | |
result = fcts->towc->__stateful; | |
} | |
else if (*s == '\0') | |
{ | |
if (pwc != NULL) | |
*pwc = L'\0'; | |
result = 0; | |
} | |
else | |
{ | |
result = __mbrtowc (pwc, 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; | |
} |