133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <langinfo.h>
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#include <limits.h>
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#include <wcsmbsload.h>
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#include <bits/libc-lock.h>
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#include <iconv/gconv_int.h>
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/* Last loaded locale for LC_CTYPE. We initialize for the C locale
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which is enabled at startup. */
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extern const struct locale_data _nl_C_LC_CTYPE;
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const struct locale_data *__wcsmbs_last_locale = &_nl_C_LC_CTYPE;
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/* These are the descriptions for the default conversion functions. */
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static struct gconv_step to_wc =
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{
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shlib_handle: NULL,
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modname: NULL,
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counter: INT_MAX,
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from_name: "ANSI_X3.4-1968",
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to_name: "#INTERNAL#",
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fct: __gconv_transform_ascii_internal,
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init_fct: NULL,
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end_fct: NULL,
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data: NULL
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};
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static struct gconv_step to_mb =
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{
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shlib_handle: NULL,
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modname: NULL,
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counter: INT_MAX,
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from_name: "#INTERNAL#",
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to_name: "ANSI_X3.4-1968",
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fct: __gconv_transform_internal_ascii,
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init_fct: NULL,
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end_fct: NULL,
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data: NULL
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};
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/* For the default locale we only have to handle ANSI_X3.4-1968. */
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struct gconv_fcts __wcsmbs_gconv_fcts =
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{
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towc: &to_wc,
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tomb: &to_mb
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};
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static inline struct gconv_step *
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getfct (const char *to, const char *from)
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{
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size_t nsteps;
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struct gconv_step *result;
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if (__gconv_find_transform (to, from, &result, &nsteps) != GCONV_OK)
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/* Loading the conversion step is not possible. */
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return NULL;
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/* We must only have one step in this conversion. */
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if (nsteps != 1)
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return NULL;
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return result;
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}
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/* Load conversion functions for the currently selected locale. */
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void
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__wcsmbs_load_conv (const struct locale_data *new_category)
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{
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/* We must modify global data. */
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__libc_lock_define_initialized (static, lock)
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/* Acquire the lock. */
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__libc_lock_lock (lock);
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/* We should repest the test since while we waited some other thread
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might have run this function. */
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if (__wcsmbs_last_locale != new_category)
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{
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if (new_category->name == _nl_C_name) /* Yes, pointer comparison. */
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{
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failed:
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__wcsmbs_gconv_fcts.towc = &to_wc;
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__wcsmbs_gconv_fcts.tomb = &to_mb;
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}
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else
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{
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/* We must find the real functions. */
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const char *charset_name;
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/* Get name of charset of the locale. */
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charset_name = new_category->values[_NL_ITEM_INDEX(CODESET)].string;
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__wcsmbs_gconv_fcts.tomb = getfct (charset_name, "#INTERNAL#");
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__wcsmbs_gconv_fcts.towc = getfct ("#INTERNAL#", charset_name);
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/* If any of the conversion functions is not available we don't
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use any since this would mean we cannot convert back and
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forth.*/
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if (__wcsmbs_gconv_fcts.towc == NULL
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|| __wcsmbs_gconv_fcts.tomb == NULL)
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goto failed;
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}
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/* Set last-used variable for current locale. */
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__wcsmbs_last_locale = new_category;
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}
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__libc_lock_unlock (lock);
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}
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