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src/basic/locale-util.c
417 строк
12 KB
Yu Watanabe
locale-util: drop libintl dependency
29 июн 2026, 17:22
29 июн 2026, 17:22
2571436
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/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include <fcntl.h> #include <langinfo.h> #include <stdlib.h> #include <sys/mman.h> #include <sys/stat.h> #include <unistd.h> #include "dirent-util.h" #include "env-util.h" #include "fd-util.h" #include "fileio.h" #include "locale-util.h" #include "log.h" #include "path-util.h" #include "process-util.h" #include "set.h" #include "stat-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "utf8.h" static char* normalize_locale(const char *name) { const char *e; /* Locale names are weird: glibc has some magic rules when looking for the charset name on disk: it * lowercases everything, and removes most special chars. This means the official .UTF-8 suffix * becomes .utf8 when looking things up on disk. When enumerating locales, let's do the reverse * operation, and go back to ".UTF-8" which appears to be the more commonly accepted name. We only do * that for UTF-8 however, since it's kinda the only charset that matters. */ e = endswith(name, ".utf8"); if (e) { _cleanup_free_ char *prefix = NULL; prefix = strndup(name, e - name); if (!prefix) return NULL; return strjoin(prefix, ".UTF-8"); } e = strstr(name, ".utf8@"); if (e) { _cleanup_free_ char *prefix = NULL; prefix = strndup(name, e - name); if (!prefix) return NULL; return strjoin(prefix, ".UTF-8@", e + 6); } return strdup(name); } static const char* get_locale_dir(void) { return secure_getenv("SYSTEMD_LOCALE_DIRECTORY") ?: #ifdef __GLIBC__ "/usr/lib/locale/"; #else "/usr/share/i18n/locales/musl/"; #endif } #ifdef __GLIBC__ static int add_locales_from_archive(Set *locales) { /* Stolen from glibc... */ struct locarhead { uint32_t magic; /* Serial number. */ uint32_t serial; /* Name hash table. */ uint32_t namehash_offset; uint32_t namehash_used; uint32_t namehash_size; /* String table. */ uint32_t string_offset; uint32_t string_used; uint32_t string_size; /* Table with locale records. */ uint32_t locrectab_offset; uint32_t locrectab_used; uint32_t locrectab_size; /* MD5 sum hash table. */ uint32_t sumhash_offset; uint32_t sumhash_used; uint32_t sumhash_size; }; struct namehashent { /* Hash value of the name. */ uint32_t hashval; /* Offset of the name in the string table. */ uint32_t name_offset; /* Offset of the locale record. */ uint32_t locrec_offset; }; int r; assert(locales); _cleanup_free_ char *locale_archive_file = path_join(get_locale_dir(), "locale-archive"); if (!locale_archive_file) return -ENOMEM; _cleanup_close_ int fd = open(locale_archive_file, O_RDONLY|O_NOCTTY|O_CLOEXEC); if (fd < 0) return errno == ENOENT ? 0 : -errno; struct stat st; if (fstat(fd, &st) < 0) return -errno; r = stat_verify_regular(&st); if (r < 0) return r; if (st.st_size < (off_t) sizeof(struct locarhead)) return -EBADMSG; if (file_offset_beyond_memory_size(st.st_size)) return -EFBIG; void *p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); if (p == MAP_FAILED) return -errno; const struct namehashent *e; const struct locarhead *h = p; if (h->magic != 0xde020109 || h->namehash_offset + h->namehash_size > st.st_size || h->string_offset + h->string_size > st.st_size || h->locrectab_offset + h->locrectab_size > st.st_size || h->sumhash_offset + h->sumhash_size > st.st_size) { r = -EBADMSG; goto finish; } e = (const struct namehashent*) ((const uint8_t*) p + h->namehash_offset); for (size_t i = 0; i < h->namehash_size; i++) { char *z; if (e[i].locrec_offset == 0) continue; if (!utf8_is_valid((char*) p + e[i].name_offset)) continue; z = normalize_locale((char*) p + e[i].name_offset); if (!z) { r = -ENOMEM; goto finish; } r = set_consume(locales, z); if (r < 0) goto finish; } r = 0; finish: if (p != MAP_FAILED) munmap(p, st.st_size); return r; } static int add_locales_from_libdir(Set *locales) { _cleanup_closedir_ DIR *dir = NULL; int r; assert(locales); dir = opendir(get_locale_dir()); if (!dir) return errno == ENOENT ? 0 : -errno; FOREACH_DIRENT(de, dir, return -errno) { char *z; if (de->d_type != DT_DIR) continue; z = normalize_locale(de->d_name); if (!z) return -ENOMEM; r = set_consume(locales, z); if (r < 0) return r; } return 0; } #else static int add_locales_for_musl(Set *locales) { int r; assert(locales); _cleanup_closedir_ DIR *dir = opendir(get_locale_dir()); if (!dir) return errno == ENOENT ? 0 : -errno; FOREACH_DIRENT(de, dir, return -errno) { if (de->d_type != DT_REG) continue; char *z = normalize_locale(de->d_name); if (!z) return -ENOMEM; r = set_consume(locales, z); if (r < 0) return r; } return 0; } #endif int get_locales(char ***ret) { _cleanup_set_free_ Set *locales = NULL; int r; assert(ret); locales = set_new(&string_hash_ops_free); if (!locales) return -ENOMEM; #ifdef __GLIBC__ r = add_locales_from_archive(locales); if (r < 0 && r != -ENOENT) return r; r = add_locales_from_libdir(locales); if (r < 0) return r; #else r = add_locales_for_musl(locales); if (r < 0) return r; #endif char *locale; SET_FOREACH(locale, locales) { r = locale_is_installed(locale); if (r < 0) return r; if (r == 0) free(set_remove(locales, locale)); } _cleanup_strv_free_ char **l = set_to_strv(&locales); if (!l) return -ENOMEM; r = getenv_bool("SYSTEMD_LIST_NON_UTF8_LOCALES"); if (r <= 0) { if (!IN_SET(r, -ENXIO, 0)) log_debug_errno(r, "Failed to parse $SYSTEMD_LIST_NON_UTF8_LOCALES as boolean, ignoring: %m"); /* Filter out non-UTF-8 locales, because it's 2019, by default */ char **b = l; STRV_FOREACH(a, l) if (endswith(*a, "UTF-8") || strstr(*a, ".UTF-8@")) *(b++) = *a; else free(*a); *b = NULL; } strv_sort(l); *ret = TAKE_PTR(l); return 0; } bool locale_is_valid(const char *name) { if (isempty(name)) return false; if (strlen(name) >= 128) return false; if (!utf8_is_valid(name)) return false; if (!filename_is_valid(name)) return false; /* Locales look like: ll_CC.ENC@variant, where ll and CC are alphabetic, ENC is alphanumeric with * dashes, and variant seems to be alphabetic. * See: https://www.gnu.org/software/gettext/manual/html_node/Locale-Names.html */ if (!in_charset(name, ALPHANUMERICAL "_.-@")) return false; return true; } int locale_is_installed(const char *name) { if (!locale_is_valid(name)) return false; if (STR_IN_SET(name, "C", "POSIX")) /* These ones are always OK */ return true; #ifdef __GLIBC__ _cleanup_(freelocalep) locale_t loc = newlocale(LC_ALL_MASK, name, (locale_t) 0); if (loc == (locale_t) 0) return errno == ENOMEM ? -ENOMEM : false; return true; #else /* musl also has C.UTF-8 as builtin */ if (streq(name, "C.UTF-8")) return true; /* musl's newlocale() always succeeds and provides a fake locale object even when the locale does * not exist. Hence, we need to explicitly check if the locale file exists. */ _cleanup_free_ char *p = path_join(get_locale_dir(), name); if (!p) return -ENOMEM; return access(p, F_OK) >= 0; #endif } static bool is_locale_utf8_impl(void) { const char *set; int r; /* Note that we default to 'true' here, since today UTF8 is pretty much supported everywhere. */ r = secure_getenv_bool("SYSTEMD_UTF8"); if (r >= 0) return r; if (r != -ENXIO) log_debug_errno(r, "Failed to parse $SYSTEMD_UTF8, ignoring: %m"); /* This function may be called from libsystemd, and setlocale() is not thread safe. Assuming yes. */ if (!is_main_thread()) return true; if (!setlocale(LC_ALL, "")) return true; set = nl_langinfo(CODESET); if (!set || streq(set, "UTF-8")) return true; set = setlocale(LC_CTYPE, NULL); if (!set) return true; /* Unless LC_CTYPE is explicitly overridden, return true. Because here CTYPE is effectively unset * and everything can do to UTF-8 nowadays. */ return STR_IN_SET(set, "C", "POSIX") && !getenv("LC_ALL") && !getenv("LC_CTYPE") && !getenv("LANG"); } bool is_locale_utf8(void) { static int cached = -1; if (cached < 0) cached = is_locale_utf8_impl(); return cached; } void locale_variables_free(char *l[_VARIABLE_LC_MAX]) { free_many_charp(l, _VARIABLE_LC_MAX); } void locale_variables_simplify(char *l[_VARIABLE_LC_MAX]) { assert(l); for (LocaleVariable p = 0; p < _VARIABLE_LC_MAX; p++) { if (p == VARIABLE_LANG) continue; if (isempty(l[p]) || streq_ptr(l[VARIABLE_LANG], l[p])) l[p] = mfree(l[p]); } } static const char * const locale_variable_table[_VARIABLE_LC_MAX] = { [VARIABLE_LANG] = "LANG", [VARIABLE_LANGUAGE] = "LANGUAGE", [VARIABLE_LC_CTYPE] = "LC_CTYPE", [VARIABLE_LC_NUMERIC] = "LC_NUMERIC", [VARIABLE_LC_TIME] = "LC_TIME", [VARIABLE_LC_COLLATE] = "LC_COLLATE", [VARIABLE_LC_MONETARY] = "LC_MONETARY", [VARIABLE_LC_MESSAGES] = "LC_MESSAGES", [VARIABLE_LC_PAPER] = "LC_PAPER", [VARIABLE_LC_NAME] = "LC_NAME", [VARIABLE_LC_ADDRESS] = "LC_ADDRESS", [VARIABLE_LC_TELEPHONE] = "LC_TELEPHONE", [VARIABLE_LC_MEASUREMENT] = "LC_MEASUREMENT", [VARIABLE_LC_IDENTIFICATION] = "LC_IDENTIFICATION" }; DEFINE_STRING_TABLE_LOOKUP(locale_variable, LocaleVariable);