251 lines
6.7 KiB
C
251 lines
6.7 KiB
C
/* Copyright (C) 1998, 1999, 2000 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 <ctype.h>
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#include <langinfo.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale/localeinfo.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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.__min_needed_from = 1,
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.__max_needed_from = 1,
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.__min_needed_to = 4,
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.__max_needed_to = 4,
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.__stateful = 0,
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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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.__min_needed_from = 4,
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.__max_needed_from = 4,
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.__min_needed_to = 1,
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.__max_needed_to = 1,
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.__stateful = 0,
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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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size_t nstateful;
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size_t cnt;
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if (__gconv_find_transform (to, from, &result, &nsteps, 0) != __GCONV_OK)
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/* Loading the conversion step is not possible. */
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return NULL;
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/* Count the number of stateful conversions. Since we will only
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have one 'mbstate_t' object available we can only deal with one
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stateful conversion. */
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nstateful = 0;
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for (cnt = 0; cnt < nsteps; ++cnt)
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if (result[cnt].__stateful)
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++nstateful;
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if (nstateful > 1)
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{
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/* We cannot handle this case. */
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__gconv_close_transform (result, nsteps);
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result = NULL;
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}
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return result;
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}
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/* Extract from the given locale name the character set portion. Since
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only the XPG form of the name includes this information we don't have
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to take care for the CEN form. */
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#define extract_charset_name(str) \
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({ \
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const char *cp = str; \
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char *result = NULL; \
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\
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cp += strcspn (cp, "@.+,"); \
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if (*cp == '.') \
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{ \
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const char *endp = ++cp; \
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while (*endp != '\0' && *endp != '@') \
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++endp; \
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if (endp != cp) \
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result = strndupa (cp, endp - cp); \
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} \
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result; \
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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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/* Load conversion functions for the currently selected locale. */
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void
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internal_function
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__wcsmbs_load_conv (const struct locale_data *new_category)
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{
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/* Acquire the lock. */
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__libc_lock_lock (lock);
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/* We should repeat 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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const char *complete_name;
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struct __gconv_step *new_towc;
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struct __gconv_step *new_tomb;
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/* Free the old conversions. */
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__gconv_close_transform (__wcsmbs_gconv_fcts.tomb, 1);
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__gconv_close_transform (__wcsmbs_gconv_fcts.towc, 1);
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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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/* Normalize the name and add the slashes necessary for a
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complete lookup. */
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complete_name = norm_add_slashes (charset_name);
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new_towc = getfct ("INTERNAL", complete_name);
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if (new_towc != NULL)
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new_tomb = getfct (complete_name, "INTERNAL");
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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 (new_towc == NULL || new_tomb == NULL)
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{
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if (new_towc != NULL)
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__gconv_close_transform (new_towc, 1);
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goto failed;
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}
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__wcsmbs_gconv_fcts.tomb = new_tomb;
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__wcsmbs_gconv_fcts.towc = new_towc;
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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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/* Clone the current conversion function set. */
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void
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internal_function
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__wcsmbs_clone_conv (struct gconv_fcts *copy)
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{
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/* First make sure the function table is up-to-date. */
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update_conversion_ptrs ();
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/* Make sure the data structures remain the same until we are finished. */
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__libc_lock_lock (lock);
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/* Copy the data. */
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*copy = __wcsmbs_gconv_fcts;
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/* Now increment the usage counters. */
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if (copy->towc->__shlib_handle != NULL)
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++copy->towc->__counter;
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if (copy->tomb->__shlib_handle != NULL)
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++copy->tomb->__counter;
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__libc_lock_unlock (lock);
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}
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/* Clone the current conversion function set. */
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int
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internal_function
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__wcsmbs_named_conv (struct gconv_fcts *copy, const char *name)
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{
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copy->towc = getfct ("INTERNAL", name);
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if (copy->towc != NULL)
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{
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copy->tomb = getfct (name, "INTERNAL");
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if (copy->tomb == NULL)
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__gconv_close_transform (copy->towc, 1);
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}
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if (copy->towc == NULL || copy->tomb == NULL)
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return 1;
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/* Now increment the usage counters. */
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if (copy->towc->__shlib_handle != NULL)
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++copy->towc->__counter;
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if (copy->tomb->__shlib_handle != NULL)
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++copy->tomb->__counter;
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return 0;
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}
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