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270 lines
7.7 KiB
C
270 lines
7.7 KiB
C
/* Copyright (C) 1998-2002,2004,2005 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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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/* These are the descriptions for the default conversion functions. */
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static const 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 = (char *) "ANSI_X3.4-1968//TRANSLIT",
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.__to_name = (char *) "INTERNAL",
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.__fct = __gconv_transform_ascii_internal,
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.__btowc_fct = __gconv_btwoc_ascii,
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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 const 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 = (char *) "INTERNAL",
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.__to_name = (char *) "ANSI_X3.4-1968//TRANSLIT",
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.__fct = __gconv_transform_internal_ascii,
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.__btowc_fct = NULL,
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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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const struct gconv_fcts __wcsmbs_gconv_fcts_c =
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{
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.towc = (struct __gconv_step *) &to_wc,
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.towc_nsteps = 1,
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.tomb = (struct __gconv_step *) &to_mb,
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.tomb_nsteps = 1
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};
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attribute_hidden
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struct __gconv_step *
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__wcsmbs_getfct (const char *to, const char *from, size_t *nstepsp)
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{
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size_t nsteps;
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struct __gconv_step *result;
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#if 0
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size_t nstateful;
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size_t cnt;
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#endif
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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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/* Maybe it is someday necessary to allow more than one step.
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Currently this is not the case since the conversions handled here
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are from and to INTERNAL and there always is a converted for
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that. It the directly following code is enabled the libio
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functions will have to allocate appropriate __gconv_step_data
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elements instead of only one. */
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#if 0
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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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#else
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if (nsteps > 1)
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#endif
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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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else
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*nstepsp = nsteps;
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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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/* Some of the functions here must not be used while setlocale is called. */
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__libc_lock_define (extern, __libc_setlocale_lock attribute_hidden)
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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 (struct locale_data *new_category)
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{
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/* Acquire the lock. */
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__libc_lock_lock (__libc_setlocale_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 (__builtin_expect (new_category->private.ctype == NULL, 1))
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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_fcts *new_fcts;
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int use_translit;
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/* Allocate the gconv_fcts structure. */
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new_fcts = malloc (sizeof *new_fcts);
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if (new_fcts == NULL)
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goto failed;
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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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/* Does the user want transliteration? */
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use_translit = new_category->use_translit;
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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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use_translit ? "TRANSLIT" : "");
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/* It is not necessary to use transliteration in this direction
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since the internal character set is supposed to be able to
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represent all others. */
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new_fcts->towc = __wcsmbs_getfct ("INTERNAL", complete_name,
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&new_fcts->towc_nsteps);
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new_fcts->tomb = (new_fcts->towc != NULL
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? __wcsmbs_getfct (complete_name, "INTERNAL",
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&new_fcts->tomb_nsteps)
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: NULL);
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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_fcts->tomb == NULL)
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{
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if (new_fcts->towc != NULL)
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__gconv_close_transform (new_fcts->towc, new_fcts->towc_nsteps);
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free (new_fcts);
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failed:
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new_category->private.ctype = &__wcsmbs_gconv_fcts_c;
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}
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else
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{
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new_category->private.ctype = new_fcts;
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new_category->private.cleanup = &_nl_cleanup_ctype;
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}
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}
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__libc_lock_unlock (__libc_setlocale_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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const struct gconv_fcts *orig;
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orig = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
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/* Copy the data. */
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*copy = *orig;
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/* Now increment the usage counters.
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Note: This assumes copy->towc_nsteps == 1 and copy->tomb_nsteps == 1. */
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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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}
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/* Get converters for named charset. */
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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 = __wcsmbs_getfct ("INTERNAL", name, ©->towc_nsteps);
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if (copy->towc != NULL)
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{
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copy->tomb = __wcsmbs_getfct (name, "INTERNAL", ©->tomb_nsteps);
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if (copy->tomb == NULL)
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__gconv_close_transform (copy->towc, copy->towc_nsteps);
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}
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return copy->towc == NULL || copy->tomb == NULL ? 1 : 0;
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}
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void internal_function
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_nl_cleanup_ctype (struct locale_data *locale)
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{
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const struct gconv_fcts *const data = locale->private.ctype;
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if (data != NULL)
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{
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locale->private.ctype = NULL;
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locale->private.cleanup = NULL;
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/* Free the old conversions. */
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__gconv_close_transform (data->tomb, data->tomb_nsteps);
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__gconv_close_transform (data->towc, data->towc_nsteps);
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free ((char *) data);
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}
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}
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