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glibc/wcsmbs/mbsnrtowcs.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@gnu.org>, 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 <string.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; | |
/* This is a non-standard function but it is very useful in the | |
implementation of stdio because we have to deal with unterminated | |
buffers. At most NMC bytes will be converted. */ | |
size_t | |
__mbsnrtowcs (wchar_t *dst, const char **src, size_t nmc, size_t len, | |
mbstate_t *ps) | |
{ | |
const unsigned char *srcend; | |
struct __gconv_step_data data; | |
size_t result; | |
int status; | |
struct __gconv_step *towc; | |
size_t dummy; | |
const struct gconv_fcts *fcts; | |
/* Tell where we want the result. */ | |
data.__invocation_counter = 0; | |
data.__internal_use = 1; | |
data.__flags = __GCONV_IS_LAST; | |
data.__statep = ps ?: &state; | |
if (nmc == 0) | |
return 0; | |
srcend = (const unsigned char *) *src + __strnlen (*src, nmc - 1) + 1; | |
/* Get the conversion functions. */ | |
fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
/* Get the structure with the function pointers. */ | |
towc = fcts->towc; | |
__gconv_fct fct = towc->__fct; | |
#ifdef PTR_DEMANGLE | |
if (towc->__shlib_handle != NULL) | |
PTR_DEMANGLE (fct); | |
#endif | |
/* We have to handle DST == NULL special. */ | |
if (dst == NULL) | |
{ | |
mbstate_t temp_state; | |
wchar_t buf[64]; /* Just an arbitrary size. */ | |
const unsigned char *inbuf = (const unsigned char *) *src; | |
temp_state = *data.__statep; | |
data.__statep = &temp_state; | |
result = 0; | |
data.__outbufend = (unsigned char *) buf + sizeof (buf); | |
do | |
{ | |
data.__outbuf = (unsigned char *) buf; | |
status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL, | |
&dummy, 0, 1)); | |
result += (wchar_t *) data.__outbuf - buf; | |
} | |
while (status == __GCONV_FULL_OUTPUT); | |
if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) | |
&& ((wchar_t *) data.__outbuf)[-1] == L'\0') | |
/* Don't count the NUL character in. */ | |
--result; | |
} | |
else | |
{ | |
/* This code is based on the safe assumption that all internal | |
multi-byte encodings use the NUL byte only to mark the end | |
of the string. */ | |
data.__outbuf = (unsigned char *) dst; | |
data.__outbufend = data.__outbuf + len * sizeof (wchar_t); | |
status = DL_CALL_FCT (fct, | |
(towc, &data, (const unsigned char **) src, srcend, | |
NULL, &dummy, 0, 1)); | |
result = (wchar_t *) data.__outbuf - dst; | |
/* We have to determine whether the last character converted | |
is the NUL character. */ | |
if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) | |
&& (assert (result > 0), | |
((wchar_t *) dst)[result - 1] == L'\0')) | |
{ | |
assert (__mbsinit (data.__statep)); | |
*src = NULL; | |
--result; | |
} | |
} | |
/* There must not be any problems with the conversion but illegal input | |
characters. */ | |
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_FULL_OUTPUT | |
&& status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT) | |
{ | |
result = (size_t) -1; | |
__set_errno (EILSEQ); | |
} | |
return result; | |
} | |
weak_alias (__mbsnrtowcs, mbsnrtowcs) |