src/basic/locale-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <dirent.h>
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <langinfo.h>
  24 #include <libintl.h>
  25 #include <locale.h>
  26 #include <stddef.h>
  27 #include <stdint.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/mman.h>
  31 #include <sys/stat.h>
  32
  33 #include "dirent-util.h"
  34 #include "fd-util.h"
  35 #include "hashmap.h"
  36 #include "locale-util.h"
  37 #include "path-util.h"
  38 #include "set.h"
  39 #include "string-table.h"
  40 #include "string-util.h"
  41 #include "strv.h"
  42 #include "utf8.h"
  43
  44 static int add_locales_from_archive(Set *locales) {
  45         /* Stolen from glibc... */
  46
  47         struct locarhead {
  48                 uint32_t magic;
  49                 /* Serial number.  */
  50                 uint32_t serial;
  51                 /* Name hash table.  */
  52                 uint32_t namehash_offset;
  53                 uint32_t namehash_used;
  54                 uint32_t namehash_size;
  55                 /* String table.  */
  56                 uint32_t string_offset;
  57                 uint32_t string_used;
  58                 uint32_t string_size;
  59                 /* Table with locale records.  */
  60                 uint32_t locrectab_offset;
  61                 uint32_t locrectab_used;
  62                 uint32_t locrectab_size;
  63                 /* MD5 sum hash table.  */
  64                 uint32_t sumhash_offset;
  65                 uint32_t sumhash_used;
  66                 uint32_t sumhash_size;
  67         };
  68
  69         struct namehashent {
  70                 /* Hash value of the name.  */
  71                 uint32_t hashval;
  72                 /* Offset of the name in the string table.  */
  73                 uint32_t name_offset;
  74                 /* Offset of the locale record.  */
  75                 uint32_t locrec_offset;
  76         };
  77
  78         const struct locarhead *h;
  79         const struct namehashent *e;
  80         const void *p = MAP_FAILED;
  81         _cleanup_close_ int fd = -1;
  82         size_t sz = 0;
  83         struct stat st;
  84         unsigned i;
  85         int r;
  86
  87         fd = open("/usr/lib/locale/locale-archive", O_RDONLY|O_NOCTTY|O_CLOEXEC);
  88         if (fd < 0)
  89                 return errno == ENOENT ? 0 : -errno;
  90
  91         if (fstat(fd, &st) < 0)
  92                 return -errno;
  93
  94         if (!S_ISREG(st.st_mode))
  95                 return -EBADMSG;
  96
  97         if (st.st_size < (off_t) sizeof(struct locarhead))
  98                 return -EBADMSG;
  99
 100         p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
 101         if (p == MAP_FAILED)
 102                 return -errno;
 103
 104         h = (const struct locarhead *) p;
 105         if (h->magic != 0xde020109 ||
 106             h->namehash_offset + h->namehash_size > st.st_size ||
 107             h->string_offset + h->string_size > st.st_size ||
 108             h->locrectab_offset + h->locrectab_size > st.st_size ||
 109             h->sumhash_offset + h->sumhash_size > st.st_size) {
 110                 r = -EBADMSG;
 111                 goto finish;
 112         }
 113
 114         e = (const struct namehashent*) ((const uint8_t*) p + h->namehash_offset);
 115         for (i = 0; i < h->namehash_size; i++) {
 116                 char *z;
 117
 118                 if (e[i].locrec_offset == 0)
 119                         continue;
 120
 121                 if (!utf8_is_valid((char*) p + e[i].name_offset))
 122                         continue;
 123
 124                 z = strdup((char*) p + e[i].name_offset);
 125                 if (!z) {
 126                         r = -ENOMEM;
 127                         goto finish;
 128                 }
 129
 130                 r = set_consume(locales, z);
 131                 if (r < 0)
 132                         goto finish;
 133         }
 134
 135         r = 0;
 136
 137  finish:
 138         if (p != MAP_FAILED)
 139                 munmap((void*) p, sz);
 140
 141         return r;
 142 }
 143
 144 static int add_locales_from_libdir (Set *locales) {
 145         _cleanup_closedir_ DIR *dir = NULL;
 146         struct dirent *entry;
 147         int r;
 148
 149         dir = opendir("/usr/lib/locale");
 150         if (!dir)
 151                 return errno == ENOENT ? 0 : -errno;
 152
 153         FOREACH_DIRENT(entry, dir, return -errno) {
 154                 char *z;
 155
 156                 dirent_ensure_type(dir, entry);
 157
 158                 if (entry->d_type != DT_DIR)
 159                         continue;
 160
 161                 z = strdup(entry->d_name);
 162                 if (!z)
 163                         return -ENOMEM;
 164
 165                 r = set_consume(locales, z);
 166                 if (r < 0 && r != -EEXIST)
 167                         return r;
 168         }
 169
 170         return 0;
 171 }
 172
 173 int get_locales(char ***ret) {
 174         _cleanup_set_free_ Set *locales = NULL;
 175         _cleanup_strv_free_ char **l = NULL;
 176         int r;
 177
 178         locales = set_new(&string_hash_ops);
 179         if (!locales)
 180                 return -ENOMEM;
 181
 182         r = add_locales_from_archive(locales);
 183         if (r < 0 && r != -ENOENT)
 184                 return r;
 185
 186         r = add_locales_from_libdir(locales);
 187         if (r < 0)
 188                 return r;
 189
 190         l = set_get_strv(locales);
 191         if (!l)
 192                 return -ENOMEM;
 193
 194         strv_sort(l);
 195
 196         *ret = l;
 197         l = NULL;
 198
 199         return 0;
 200 }
 201
 202 bool locale_is_valid(const char *name) {
 203
 204         if (isempty(name))
 205                 return false;
 206
 207         if (strlen(name) >= 128)
 208                 return false;
 209
 210         if (!utf8_is_valid(name))
 211                 return false;
 212
 213         if (!filename_is_valid(name))
 214                 return false;
 215
 216         if (!string_is_safe(name))
 217                 return false;
 218
 219         return true;
 220 }
 221
 222 void init_gettext(void) {
 223         setlocale(LC_ALL, "");
 224         textdomain(GETTEXT_PACKAGE);
 225 }
 226
 227 bool is_locale_utf8(void) {
 228         const char *set;
 229         static int cached_answer = -1;
 230
 231         /* Note that we default to 'true' here, since today UTF8 is
 232          * pretty much supported everywhere. */
 233
 234         if (cached_answer >= 0)
 235                 goto out;
 236
 237         if (!setlocale(LC_ALL, "")) {
 238                 cached_answer = true;
 239                 goto out;
 240         }
 241
 242         set = nl_langinfo(CODESET);
 243         if (!set) {
 244                 cached_answer = true;
 245                 goto out;
 246         }
 247
 248         if (streq(set, "UTF-8")) {
 249                 cached_answer = true;
 250                 goto out;
 251         }
 252
 253         /* For LC_CTYPE=="C" return true, because CTYPE is effectly
 254          * unset and everything can do to UTF-8 nowadays. */
 255         set = setlocale(LC_CTYPE, NULL);
 256         if (!set) {
 257                 cached_answer = true;
 258                 goto out;
 259         }
 260
 261         /* Check result, but ignore the result if C was set
 262          * explicitly. */
 263         cached_answer =
 264                 STR_IN_SET(set, "C", "POSIX") &&
 265                 !getenv("LC_ALL") &&
 266                 !getenv("LC_CTYPE") &&
 267                 !getenv("LANG");
 268
 269 out:
 270         return (bool) cached_answer;
 271 }
 272
 273
 274 const char *special_glyph(SpecialGlyph code) {
 275
 276         static const char* const draw_table[2][_SPECIAL_GLYPH_MAX] = {
 277                 /* ASCII fallback */
 278                 [false] = {
 279                         [TREE_VERTICAL]      = "| ",
 280                         [TREE_BRANCH]        = "|-",
 281                         [TREE_RIGHT]         = "`-",
 282                         [TREE_SPACE]         = "  ",
 283                         [TRIANGULAR_BULLET]  = ">",
 284                         [BLACK_CIRCLE]       = "*",
 285                         [ARROW]              = "->",
 286                         [MDASH]              = "-",
 287                 },
 288
 289                 /* UTF-8 */
 290                 [ true ] = {
 291                         [TREE_VERTICAL]      = "\342\224\202 ",            /* │  */
 292                         [TREE_BRANCH]        = "\342\224\234\342\224\200", /* ├─ */
 293                         [TREE_RIGHT]         = "\342\224\224\342\224\200", /* └─ */
 294                         [TREE_SPACE]         = "  ",                       /*    */
 295                         [TRIANGULAR_BULLET]  = "\342\200\243",             /* ‣ */
 296                         [BLACK_CIRCLE]       = "\342\227\217",             /* ● */
 297                         [ARROW]              = "\342\206\222",             /* → */
 298                         [MDASH]              = "\342\200\223",             /* – */
 299                 },
 300         };
 301
 302         return draw_table[is_locale_utf8()][code];
 303 }
 304
 305 static const char * const locale_variable_table[_VARIABLE_LC_MAX] = {
 306         [VARIABLE_LANG] = "LANG",
 307         [VARIABLE_LANGUAGE] = "LANGUAGE",
 308         [VARIABLE_LC_CTYPE] = "LC_CTYPE",
 309         [VARIABLE_LC_NUMERIC] = "LC_NUMERIC",
 310         [VARIABLE_LC_TIME] = "LC_TIME",
 311         [VARIABLE_LC_COLLATE] = "LC_COLLATE",
 312         [VARIABLE_LC_MONETARY] = "LC_MONETARY",
 313         [VARIABLE_LC_MESSAGES] = "LC_MESSAGES",
 314         [VARIABLE_LC_PAPER] = "LC_PAPER",
 315         [VARIABLE_LC_NAME] = "LC_NAME",
 316         [VARIABLE_LC_ADDRESS] = "LC_ADDRESS",
 317         [VARIABLE_LC_TELEPHONE] = "LC_TELEPHONE",
 318         [VARIABLE_LC_MEASUREMENT] = "LC_MEASUREMENT",
 319         [VARIABLE_LC_IDENTIFICATION] = "LC_IDENTIFICATION"
 320 };
 321
 322 DEFINE_STRING_TABLE_LOOKUP(locale_variable, LocaleVariable);