lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1998-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <ctype.h> |
| 20 | #include <langinfo.h> |
| 21 | #include <limits.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include <locale/localeinfo.h> |
| 26 | #include <wcsmbsload.h> |
| 27 | #include <bits/libc-lock.h> |
| 28 | |
| 29 | |
| 30 | /* These are the descriptions for the default conversion functions. */ |
| 31 | static const struct __gconv_step to_wc = |
| 32 | { |
| 33 | .__shlib_handle = NULL, |
| 34 | .__modname = NULL, |
| 35 | .__counter = INT_MAX, |
| 36 | .__from_name = (char *) "ANSI_X3.4-1968//TRANSLIT", |
| 37 | .__to_name = (char *) "INTERNAL", |
| 38 | .__fct = __gconv_transform_ascii_internal, |
| 39 | .__btowc_fct = __gconv_btwoc_ascii, |
| 40 | .__init_fct = NULL, |
| 41 | .__end_fct = NULL, |
| 42 | .__min_needed_from = 1, |
| 43 | .__max_needed_from = 1, |
| 44 | .__min_needed_to = 4, |
| 45 | .__max_needed_to = 4, |
| 46 | .__stateful = 0, |
| 47 | .__data = NULL |
| 48 | }; |
| 49 | |
| 50 | static const struct __gconv_step to_mb = |
| 51 | { |
| 52 | .__shlib_handle = NULL, |
| 53 | .__modname = NULL, |
| 54 | .__counter = INT_MAX, |
| 55 | .__from_name = (char *) "INTERNAL", |
| 56 | .__to_name = (char *) "ANSI_X3.4-1968//TRANSLIT", |
| 57 | .__fct = __gconv_transform_internal_ascii, |
| 58 | .__btowc_fct = NULL, |
| 59 | .__init_fct = NULL, |
| 60 | .__end_fct = NULL, |
| 61 | .__min_needed_from = 4, |
| 62 | .__max_needed_from = 4, |
| 63 | .__min_needed_to = 1, |
| 64 | .__max_needed_to = 1, |
| 65 | .__stateful = 0, |
| 66 | .__data = NULL |
| 67 | }; |
| 68 | |
| 69 | |
| 70 | /* For the default locale we only have to handle ANSI_X3.4-1968. */ |
| 71 | const struct gconv_fcts __wcsmbs_gconv_fcts_c = |
| 72 | { |
| 73 | .towc = (struct __gconv_step *) &to_wc, |
| 74 | .towc_nsteps = 1, |
| 75 | .tomb = (struct __gconv_step *) &to_mb, |
| 76 | .tomb_nsteps = 1, |
| 77 | }; |
| 78 | |
| 79 | |
| 80 | attribute_hidden |
| 81 | struct __gconv_step * |
| 82 | __wcsmbs_getfct (const char *to, const char *from, size_t *nstepsp) |
| 83 | { |
| 84 | size_t nsteps; |
| 85 | struct __gconv_step *result; |
| 86 | #if 0 |
| 87 | size_t nstateful; |
| 88 | size_t cnt; |
| 89 | #endif |
| 90 | |
| 91 | if (__gconv_find_transform (to, from, &result, &nsteps, 0) != __GCONV_OK) |
| 92 | /* Loading the conversion step is not possible. */ |
| 93 | return NULL; |
| 94 | |
| 95 | /* Maybe it is someday necessary to allow more than one step. |
| 96 | Currently this is not the case since the conversions handled here |
| 97 | are from and to INTERNAL and there always is a converted for |
| 98 | that. It the directly following code is enabled the libio |
| 99 | functions will have to allocate appropriate __gconv_step_data |
| 100 | elements instead of only one. */ |
| 101 | #if 0 |
| 102 | /* Count the number of stateful conversions. Since we will only |
| 103 | have one 'mbstate_t' object available we can only deal with one |
| 104 | stateful conversion. */ |
| 105 | nstateful = 0; |
| 106 | for (cnt = 0; cnt < nsteps; ++cnt) |
| 107 | if (result[cnt].__stateful) |
| 108 | ++nstateful; |
| 109 | if (nstateful > 1) |
| 110 | #else |
| 111 | if (nsteps > 1) |
| 112 | #endif |
| 113 | { |
| 114 | /* We cannot handle this case. */ |
| 115 | __gconv_close_transform (result, nsteps); |
| 116 | result = NULL; |
| 117 | } |
| 118 | else |
| 119 | *nstepsp = nsteps; |
| 120 | |
| 121 | return result; |
| 122 | } |
| 123 | |
| 124 | |
| 125 | /* Extract from the given locale name the character set portion. Since |
| 126 | only the XPG form of the name includes this information we don't have |
| 127 | to take care for the CEN form. */ |
| 128 | #define extract_charset_name(str) \ |
| 129 | ({ \ |
| 130 | const char *cp = str; \ |
| 131 | char *result = NULL; \ |
| 132 | \ |
| 133 | cp += strcspn (cp, "@.+,"); \ |
| 134 | if (*cp == '.') \ |
| 135 | { \ |
| 136 | const char *endp = ++cp; \ |
| 137 | while (*endp != '\0' && *endp != '@') \ |
| 138 | ++endp; \ |
| 139 | if (endp != cp) \ |
| 140 | result = strndupa (cp, endp - cp); \ |
| 141 | } \ |
| 142 | result; \ |
| 143 | }) |
| 144 | |
| 145 | |
| 146 | /* Some of the functions here must not be used while setlocale is called. */ |
| 147 | __libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden) |
| 148 | |
| 149 | /* Load conversion functions for the currently selected locale. */ |
| 150 | void |
| 151 | internal_function |
| 152 | __wcsmbs_load_conv (struct __locale_data *new_category) |
| 153 | { |
| 154 | /* Acquire the lock. */ |
| 155 | __libc_rwlock_wrlock (__libc_setlocale_lock); |
| 156 | |
| 157 | /* We should repeat the test since while we waited some other thread |
| 158 | might have run this function. */ |
| 159 | if (__glibc_likely (new_category->private.ctype == NULL)) |
| 160 | { |
| 161 | /* We must find the real functions. */ |
| 162 | const char *charset_name; |
| 163 | const char *complete_name; |
| 164 | struct gconv_fcts *new_fcts; |
| 165 | int use_translit; |
| 166 | |
| 167 | /* Allocate the gconv_fcts structure. */ |
| 168 | new_fcts = calloc (1, sizeof *new_fcts); |
| 169 | if (new_fcts == NULL) |
| 170 | goto failed; |
| 171 | |
| 172 | /* Get name of charset of the locale. */ |
| 173 | charset_name = new_category->values[_NL_ITEM_INDEX(CODESET)].string; |
| 174 | |
| 175 | /* Does the user want transliteration? */ |
| 176 | use_translit = new_category->use_translit; |
| 177 | |
| 178 | /* Normalize the name and add the slashes necessary for a |
| 179 | complete lookup. */ |
| 180 | complete_name = norm_add_slashes (charset_name, |
| 181 | use_translit ? "TRANSLIT" : ""); |
| 182 | |
| 183 | /* It is not necessary to use transliteration in this direction |
| 184 | since the internal character set is supposed to be able to |
| 185 | represent all others. */ |
| 186 | new_fcts->towc = __wcsmbs_getfct ("INTERNAL", complete_name, |
| 187 | &new_fcts->towc_nsteps); |
| 188 | if (new_fcts->towc != NULL) |
| 189 | new_fcts->tomb = __wcsmbs_getfct (complete_name, "INTERNAL", |
| 190 | &new_fcts->tomb_nsteps); |
| 191 | |
| 192 | /* If any of the conversion functions is not available we don't |
| 193 | use any since this would mean we cannot convert back and |
| 194 | forth. NB: NEW_FCTS was allocated with calloc. */ |
| 195 | if (new_fcts->tomb == NULL) |
| 196 | { |
| 197 | if (new_fcts->towc != NULL) |
| 198 | __gconv_close_transform (new_fcts->towc, new_fcts->towc_nsteps); |
| 199 | |
| 200 | free (new_fcts); |
| 201 | |
| 202 | failed: |
| 203 | new_category->private.ctype = &__wcsmbs_gconv_fcts_c; |
| 204 | } |
| 205 | else |
| 206 | { |
| 207 | new_category->private.ctype = new_fcts; |
| 208 | new_category->private.cleanup = &_nl_cleanup_ctype; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | __libc_rwlock_unlock (__libc_setlocale_lock); |
| 213 | } |
| 214 | |
| 215 | |
| 216 | /* Clone the current conversion function set. */ |
| 217 | void |
| 218 | internal_function |
| 219 | __wcsmbs_clone_conv (struct gconv_fcts *copy) |
| 220 | { |
| 221 | const struct gconv_fcts *orig; |
| 222 | |
| 223 | orig = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); |
| 224 | |
| 225 | /* Copy the data. */ |
| 226 | *copy = *orig; |
| 227 | |
| 228 | /* Now increment the usage counters. |
| 229 | Note: This assumes copy->*_nsteps == 1. */ |
| 230 | if (copy->towc->__shlib_handle != NULL) |
| 231 | ++copy->towc->__counter; |
| 232 | if (copy->tomb->__shlib_handle != NULL) |
| 233 | ++copy->tomb->__counter; |
| 234 | } |
| 235 | |
| 236 | |
| 237 | /* Get converters for named charset. */ |
| 238 | int |
| 239 | internal_function |
| 240 | __wcsmbs_named_conv (struct gconv_fcts *copy, const char *name) |
| 241 | { |
| 242 | copy->towc = __wcsmbs_getfct ("INTERNAL", name, ©->towc_nsteps); |
| 243 | if (copy->towc == NULL) |
| 244 | return 1; |
| 245 | |
| 246 | copy->tomb = __wcsmbs_getfct (name, "INTERNAL", ©->tomb_nsteps); |
| 247 | if (copy->tomb == NULL) |
| 248 | { |
| 249 | __gconv_close_transform (copy->towc, copy->towc_nsteps); |
| 250 | return 1; |
| 251 | } |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | void internal_function |
| 257 | _nl_cleanup_ctype (struct __locale_data *locale) |
| 258 | { |
| 259 | const struct gconv_fcts *const data = locale->private.ctype; |
| 260 | if (data != NULL) |
| 261 | { |
| 262 | locale->private.ctype = NULL; |
| 263 | locale->private.cleanup = NULL; |
| 264 | |
| 265 | /* Free the old conversions. */ |
| 266 | __gconv_close_transform (data->tomb, data->tomb_nsteps); |
| 267 | __gconv_close_transform (data->towc, data->towc_nsteps); |
| 268 | free ((char *) data); |
| 269 | } |
| 270 | } |