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                 if (entry->d_type != DT_DIR)
 157                         continue;
 158
 159                 z = strdup(entry->d_name);
 160                 if (!z)
 161                         return -ENOMEM;
 162
 163                 r = set_consume(locales, z);
 164                 if (r < 0 && r != -EEXIST)
 165                         return r;
 166         }
 167
 168         return 0;
 169 }
 170
 171 int get_locales(char ***ret) {
 172         _cleanup_set_free_ Set *locales = NULL;
 173         _cleanup_strv_free_ char **l = NULL;
 174         int r;
 175
 176         locales = set_new(&string_hash_ops);
 177         if (!locales)
 178                 return -ENOMEM;
 179
 180         r = add_locales_from_archive(locales);
 181         if (r < 0 && r != -ENOENT)
 182                 return r;
 183
 184         r = add_locales_from_libdir(locales);
 185         if (r < 0)
 186                 return r;
 187
 188         l = set_get_strv(locales);
 189         if (!l)
 190                 return -ENOMEM;
 191
 192         strv_sort(l);
 193
 194         *ret = l;
 195         l = NULL;
 196
 197         return 0;
 198 }
 199
 200 bool locale_is_valid(const char *name) {
 201
 202         if (isempty(name))
 203                 return false;
 204
 205         if (strlen(name) >= 128)
 206                 return false;
 207
 208         if (!utf8_is_valid(name))
 209                 return false;
 210
 211         if (!filename_is_valid(name))
 212                 return false;
 213
 214         if (!string_is_safe(name))
 215                 return false;
 216
 217         return true;
 218 }
 219
 220 void init_gettext(void) {
 221         setlocale(LC_ALL, "");
 222         textdomain(GETTEXT_PACKAGE);
 223 }
 224
 225 bool is_locale_utf8(void) {
 226         const char *set;
 227         static int cached_answer = -1;
 228
 229         /* Note that we default to 'true' here, since today UTF8 is
 230          * pretty much supported everywhere. */
 231
 232         if (cached_answer >= 0)
 233                 goto out;
 234
 235         if (!setlocale(LC_ALL, "")) {
 236                 cached_answer = true;
 237                 goto out;
 238         }
 239
 240         set = nl_langinfo(CODESET);
 241         if (!set) {
 242                 cached_answer = true;
 243                 goto out;
 244         }
 245
 246         if (streq(set, "UTF-8")) {
 247                 cached_answer = true;
 248                 goto out;
 249         }
 250
 251         /* For LC_CTYPE=="C" return true, because CTYPE is effectly
 252          * unset and everything can do to UTF-8 nowadays. */
 253         set = setlocale(LC_CTYPE, NULL);
 254         if (!set) {
 255                 cached_answer = true;
 256                 goto out;
 257         }
 258
 259         /* Check result, but ignore the result if C was set
 260          * explicitly. */
 261         cached_answer =
 262                 STR_IN_SET(set, "C", "POSIX") &&
 263                 !getenv("LC_ALL") &&
 264                 !getenv("LC_CTYPE") &&
 265                 !getenv("LANG");
 266
 267 out:
 268         return (bool) cached_answer;
 269 }
 270
 271
 272 const char *draw_special_char(DrawSpecialChar ch) {
 273
 274         static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = {
 275
 276                 /* UTF-8 */ {
 277                         [DRAW_TREE_VERTICAL]      = "\342\224\202 ",            /* │  */
 278                         [DRAW_TREE_BRANCH]        = "\342\224\234\342\224\200", /* ├─ */
 279                         [DRAW_TREE_RIGHT]         = "\342\224\224\342\224\200", /* └─ */
 280                         [DRAW_TREE_SPACE]         = "  ",                       /*    */
 281                         [DRAW_TRIANGULAR_BULLET]  = "\342\200\243",             /* ‣ */
 282                         [DRAW_BLACK_CIRCLE]       = "\342\227\217",             /* ● */
 283                         [DRAW_ARROW]              = "\342\206\222",             /* → */
 284                         [DRAW_DASH]               = "\342\200\223",             /* – */
 285                 },
 286
 287                 /* ASCII fallback */ {
 288                         [DRAW_TREE_VERTICAL]      = "| ",
 289                         [DRAW_TREE_BRANCH]        = "|-",
 290                         [DRAW_TREE_RIGHT]         = "`-",
 291                         [DRAW_TREE_SPACE]         = "  ",
 292                         [DRAW_TRIANGULAR_BULLET]  = ">",
 293                         [DRAW_BLACK_CIRCLE]       = "*",
 294                         [DRAW_ARROW]              = "->",
 295                         [DRAW_DASH]               = "-",
 296                 }
 297         };
 298
 299         return draw_table[!is_locale_utf8()][ch];
 300 }
 301
 302 static const char * const locale_variable_table[_VARIABLE_LC_MAX] = {
 303         [VARIABLE_LANG] = "LANG",
 304         [VARIABLE_LANGUAGE] = "LANGUAGE",
 305         [VARIABLE_LC_CTYPE] = "LC_CTYPE",
 306         [VARIABLE_LC_NUMERIC] = "LC_NUMERIC",
 307         [VARIABLE_LC_TIME] = "LC_TIME",
 308         [VARIABLE_LC_COLLATE] = "LC_COLLATE",
 309         [VARIABLE_LC_MONETARY] = "LC_MONETARY",
 310         [VARIABLE_LC_MESSAGES] = "LC_MESSAGES",
 311         [VARIABLE_LC_PAPER] = "LC_PAPER",
 312         [VARIABLE_LC_NAME] = "LC_NAME",
 313         [VARIABLE_LC_ADDRESS] = "LC_ADDRESS",
 314         [VARIABLE_LC_TELEPHONE] = "LC_TELEPHONE",
 315         [VARIABLE_LC_MEASUREMENT] = "LC_MEASUREMENT",
 316         [VARIABLE_LC_IDENTIFICATION] = "LC_IDENTIFICATION"
 317 };
 318
 319 DEFINE_STRING_TABLE_LOOKUP(locale_variable, LocaleVariable);