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/* Get descriptor for character set conversion.
Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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
<https://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <errno.h>
#include <iconv.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <gconv_int.h>
#include "gconv_charset.h"
iconv_t
iconv_open (const char *tocode, const char *fromcode)
{
/* Normalize the name. We remove all characters beside alpha-numeric,
'_', '-', '/', '.', and ':'. */
size_t tocode_len = strlen (tocode) + 3;
char *tocode_conv;
bool tocode_usealloca = __libc_use_alloca (tocode_len);
if (tocode_usealloca)
tocode_conv = (char *) alloca (tocode_len);
else
{
tocode_conv = (char *) malloc (tocode_len);
if (tocode_conv == NULL)
return (iconv_t) -1;
}
strip (tocode_conv, tocode);
tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
? upstr (tocode_conv, tocode) : tocode_conv);
size_t fromcode_len = strlen (fromcode) + 3;
char *fromcode_conv;
bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
if (fromcode_usealloca)
fromcode_conv = (char *) alloca (fromcode_len);
else
{
fromcode_conv = (char *) malloc (fromcode_len);
if (fromcode_conv == NULL)
{
if (! tocode_usealloca)
free (tocode_conv);
return (iconv_t) -1;
}
}
strip (fromcode_conv, fromcode);
fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
? upstr (fromcode_conv, fromcode) : fromcode_conv);
__gconv_t cd;
int res = __gconv_open (tocode, fromcode, &cd, 0);
if (! fromcode_usealloca)
free (fromcode_conv);
if (! tocode_usealloca)
free (tocode_conv);
if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
{
/* We must set the error number according to the specs. */
if (res == __GCONV_NOCONV || res == __GCONV_NODB)
__set_errno (EINVAL);
cd = (iconv_t) -1;
}
return (iconv_t) cd;
}
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