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glibc/wcsmbs/wcrtomb.c
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/* Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
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 <assert.h> | |
#include <dlfcn.h> | |
#include <errno.h> | |
#include <gconv.h> | |
#include <stdlib.h> | |
#include <wchar.h> | |
#include <wcsmbsload.h> | |
#include <sysdep.h> | |
#ifndef EILSEQ | |
# define EILSEQ EINVAL | |
#endif | |
/* This is the private state used if PS is NULL. */ | |
static mbstate_t state; | |
size_t | |
__wcrtomb (char *s, wchar_t wc, mbstate_t *ps) | |
{ | |
char buf[MB_LEN_MAX]; | |
struct __gconv_step_data data; | |
int status; | |
size_t result; | |
size_t dummy; | |
const struct gconv_fcts *fcts; | |
/* Set information for this step. */ | |
data.__invocation_counter = 0; | |
data.__internal_use = 1; | |
data.__flags = __GCONV_IS_LAST; | |
data.__statep = ps ?: &state; | |
/* A first special case is if S is NULL. This means put PS in the | |
initial state. */ | |
if (s == NULL) | |
{ | |
s = buf; | |
wc = L'\0'; | |
} | |
/* Tell where we want to have the result. */ | |
data.__outbuf = (unsigned char *) s; | |
data.__outbufend = (unsigned char *) s + MB_CUR_MAX; | |
/* Get the conversion functions. */ | |
fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
__gconv_fct fct = fcts->tomb->__fct; | |
#ifdef PTR_DEMANGLE | |
if (fcts->tomb->__shlib_handle != NULL) | |
PTR_DEMANGLE (fct); | |
#endif | |
/* If WC is the NUL character we write into the output buffer the byte | |
sequence necessary for PS to get into the initial state, followed | |
by a NUL byte. */ | |
if (wc == L'\0') | |
{ | |
status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL, | |
NULL, &dummy, 1, 1)); | |
if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) | |
*data.__outbuf++ = '\0'; | |
} | |
else | |
{ | |
/* Do a normal conversion. */ | |
const unsigned char *inbuf = (const unsigned char *) &wc; | |
status = DL_CALL_FCT (fct, | |
(fcts->tomb, &data, &inbuf, | |
inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1)); | |
} | |
/* There must not be any problems with the conversion but illegal input | |
characters. The output buffer must be large enough, otherwise the | |
definition of MB_CUR_MAX is not correct. All the other possible | |
errors also must not happen. */ | |
assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT | |
|| status == __GCONV_ILLEGAL_INPUT | |
|| status == __GCONV_INCOMPLETE_INPUT | |
|| status == __GCONV_FULL_OUTPUT); | |
if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT | |
|| status == __GCONV_FULL_OUTPUT) | |
result = data.__outbuf - (unsigned char *) s; | |
else | |
{ | |
result = (size_t) -1; | |
__set_errno (EILSEQ); | |
} | |
return result; | |
} | |
weak_alias (__wcrtomb, wcrtomb) | |
libc_hidden_weak (wcrtomb) | |
/* There should be no difference between the UTF-32 handling required | |
by c32rtomb and the wchar_t handling which has long since been | |
implemented in wcrtomb. */ | |
weak_alias (__wcrtomb, c32rtomb) |