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/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <langinfo.h>
#include <limits.h>
#include <wcsmbsload.h>
#include <bits/libc-lock.h>
#include <iconv/gconv_int.h>
/* Last loaded locale for LC_CTYPE. We initialize for the C locale
which is enabled at startup. */
extern const struct locale_data _nl_C_LC_CTYPE;
const struct locale_data *__wcsmbs_last_locale = &_nl_C_LC_CTYPE;
/* These are the descriptions for the default conversion functions. */
static struct gconv_step to_wc =
{
shlib_handle: NULL,
modname: NULL,
counter: INT_MAX,
from_name: "ANSI_X3.4-1968",
to_name: "ISO-10646/UCS4/",
fct: __gconv_transform_ascii_ucs4,
init_fct: NULL,
end_fct: NULL,
data: NULL
};
static struct gconv_step to_mb =
{
shlib_handle: NULL,
modname: NULL,
counter: INT_MAX,
from_name: "ISO-10646/UCS4/",
to_name: "ANSI_X3.4-1968",
fct: __gconv_transform_ucs4_ascii,
init_fct: NULL,
end_fct: NULL,
data: NULL
};
/* For the default locale we only have to handle ANSI_X3.4-1968. */
struct gconv_fcts __wcsmbs_gconv_fcts =
{
towc: &to_wc,
tomb: &to_mb
};
static inline struct gconv_step *
getfct (const char *to, const char *from)
{
size_t nsteps;
struct gconv_step *result;
if (__gconv_find_transform (to, from, &result, &nsteps) != GCONV_OK)
/* Loading the conversion step is not possible. */
return NULL;
/* We must only have one step in this conversion. */
if (nsteps != 1)
return NULL;
return result;
}
/* Load conversion functions for the currently selected locale. */
void
__wcsmbs_load_conv (const struct locale_data *new_category)
{
/* We must modify global data. */
__libc_lock_define_initialized (static, lock)
/* Acquire the lock. */
__libc_lock_lock (lock);
/* We should repest the test since while we waited some other thread
might have run this function. */
if (__wcsmbs_last_locale != new_category)
{
if (new_category->name == _nl_C_name) /* Yes, pointer comparison. */
{
failed:
__wcsmbs_gconv_fcts.towc = &to_wc;
__wcsmbs_gconv_fcts.tomb = &to_mb;
}
else
{
/* We must find the real functions. */
const char *charset_name;
/* Get name of charset of the locale. */
charset_name = new_category->values[_NL_ITEM_INDEX(CODESET)].string;
__wcsmbs_gconv_fcts.tomb = getfct (charset_name, "ISO-10646/UCS4/");
__wcsmbs_gconv_fcts.towc = getfct ("ISO-10646/UCS4/", charset_name);
/* If any of the conversion functions is not available we don't
use any since this would mean we cannot convert back and
forth.*/
if (__wcsmbs_gconv_fcts.towc == NULL
|| __wcsmbs_gconv_fcts.tomb == NULL)
goto failed;
}
/* Set last-used variable for current locale. */
__wcsmbs_last_locale = new_category;
}
__libc_lock_unlock (lock);
}
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