diff options
Diffstat (limited to 'grub-core/gettext/gettext.c')
| -rw-r--r-- | grub-core/gettext/gettext.c | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/grub-core/gettext/gettext.c b/grub-core/gettext/gettext.c new file mode 100644 index 0000000..cca8b90 --- /dev/null +++ b/grub-core/gettext/gettext.c @@ -0,0 +1,400 @@ +/* gettext.c - gettext module */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2009 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/list.h> +#include <grub/types.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/err.h> +#include <grub/dl.h> +#include <grub/normal.h> +#include <grub/file.h> +#include <grub/kernel.h> +#include <grub/i18n.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +/* + .mo file information from: + http://www.gnu.org/software/autoconf/manual/gettext/MO-Files.html . +*/ + + +static grub_file_t fd_mo; + +static int grub_gettext_offsetoriginal; +static int grub_gettext_max; + +static const char *(*grub_gettext_original) (const char *s); + +struct grub_gettext_msg +{ + struct grub_gettext_msg *next; + const char *name; + + const char *translated; +}; + +static struct grub_gettext_msg *grub_gettext_msg_list = NULL; + +#define GETTEXT_MAGIC_NUMBER 0 +#define GETTEXT_FILE_FORMAT 4 +#define GETTEXT_NUMBER_OF_STRINGS 8 +#define GETTEXT_OFFSET_ORIGINAL 12 +#define GETTEXT_OFFSET_TRANSLATION 16 + +#define MO_MAGIC_NUMBER 0x950412de + +static grub_ssize_t +grub_gettext_pread (grub_file_t file, void *buf, grub_size_t len, + grub_off_t offset) +{ + if (grub_file_seek (file, offset) == (grub_off_t) - 1) + { + return -1; + } + return grub_file_read (file, buf, len); +} + +static grub_uint32_t +grub_gettext_get_info (int offset) +{ + grub_uint32_t value; + + grub_gettext_pread (fd_mo, (char *) &value, 4, offset); + + value = grub_cpu_to_le32 (value); + return value; +} + +static void +grub_gettext_getstring_from_offset (grub_uint32_t offset, + grub_uint32_t length, char *translation) +{ + grub_gettext_pread (fd_mo, translation, length, offset); + translation[length] = '\0'; +} + +static const char * +grub_gettext_gettranslation_from_position (int position) +{ + int offsettranslation; + int internal_position; + grub_uint32_t length, offset; + char *translation; + + offsettranslation = grub_gettext_get_info (GETTEXT_OFFSET_TRANSLATION); + + internal_position = offsettranslation + position * 8; + + grub_gettext_pread (fd_mo, (char *) &length, 4, internal_position); + length = grub_cpu_to_le32 (length); + + grub_gettext_pread (fd_mo, (char *) &offset, 4, internal_position + 4); + offset = grub_cpu_to_le32 (offset); + + translation = grub_malloc (length + 1); + grub_gettext_getstring_from_offset (offset, length, translation); + + return translation; +} + +static char * +grub_gettext_getstring_from_position (int position) +{ + int internal_position; + int length, offset; + char *original; + + /* Get position for string i. */ + internal_position = grub_gettext_offsetoriginal + (position * 8); + + /* Get the length of the string i. */ + grub_gettext_pread (fd_mo, (char *) &length, 4, internal_position); + + /* Get the offset of the string i. */ + grub_gettext_pread (fd_mo, (char *) &offset, 4, internal_position + 4); + + /* Get the string i. */ + original = grub_malloc (length + 1); + grub_gettext_getstring_from_offset (offset, length, original); + + return original; +} + +static const char * +grub_gettext_translate (const char *orig) +{ + char *current_string; + const char *ret; + + int min, max, current; + int found = 0; + + struct grub_gettext_msg *cur; + + /* Make sure we can use grub_gettext_translate for error messages. Push + active error message to error stack and reset error message. */ + grub_error_push (); + + cur = grub_named_list_find (GRUB_AS_NAMED_LIST (grub_gettext_msg_list), + orig); + + if (cur) + { + grub_error_pop (); + return cur->translated; + } + + if (fd_mo == 0) + { + grub_error_pop (); + return orig; + } + + min = 0; + max = grub_gettext_max; + + current = (max + min) / 2; + + while (current != min && current != max && found == 0) + { + current_string = grub_gettext_getstring_from_position (current); + + /* Search by bisection. */ + if (grub_strcmp (current_string, orig) < 0) + { + grub_free (current_string); + min = current; + } + else if (grub_strcmp (current_string, orig) > 0) + { + grub_free (current_string); + max = current; + } + else if (grub_strcmp (current_string, orig) == 0) + { + grub_free (current_string); + found = 1; + } + current = (max + min) / 2; + } + + ret = found ? grub_gettext_gettranslation_from_position (current) : orig; + + if (found) + { + cur = grub_zalloc (sizeof (*cur)); + + if (cur) + { + cur->name = grub_strdup (orig); + if (cur->name) + { + cur->translated = ret; + grub_list_push (GRUB_AS_LIST_P (&grub_gettext_msg_list), + GRUB_AS_LIST (cur)); + } + } + else + grub_errno = GRUB_ERR_NONE; + } + + grub_error_pop (); + return ret; +} + +/* This is similar to grub_file_open. */ +static grub_file_t +grub_mofile_open (const char *filename) +{ + int unsigned magic; + int version; + + /* Using fd_mo and not another variable because + it's needed for grub_gettext_get_info. */ + + fd_mo = grub_file_open (filename); + grub_errno = GRUB_ERR_NONE; + + if (!fd_mo) + { + grub_dprintf ("gettext", "Cannot read %s\n", filename); + return 0; + } + + magic = grub_gettext_get_info (GETTEXT_MAGIC_NUMBER); + + if (magic != MO_MAGIC_NUMBER) + { + grub_error (GRUB_ERR_BAD_FILE_TYPE, "mo: invalid mo file: %s", + filename); + grub_file_close (fd_mo); + fd_mo = 0; + return 0; + } + + version = grub_gettext_get_info (GETTEXT_FILE_FORMAT); + + if (version != 0) + { + grub_error (GRUB_ERR_BAD_FILE_TYPE, + "mo: invalid mo version in file: %s", filename); + fd_mo = 0; + return 0; + } + + return fd_mo; +} + +/* Returning grub_file_t would be more natural, but grub_mofile_open assigns + to fd_mo anyway ... */ +static void +grub_mofile_open_lang (const char *locale_dir, const char *locale) +{ + char *mo_file; + + /* mo_file e.g.: /boot/grub/locale/ca.mo */ + + mo_file = grub_xasprintf ("%s/%s.mo", locale_dir, locale); + if (!mo_file) + return; + + fd_mo = grub_mofile_open (mo_file); + + /* Will try adding .gz as well. */ + if (fd_mo == NULL) + { + char *mo_file_old; + mo_file_old = mo_file; + mo_file = grub_xasprintf ("%s.gz", mo_file); + grub_free (mo_file_old); + if (!mo_file) + return; + fd_mo = grub_mofile_open (mo_file); + } +} + +static void +grub_gettext_init_ext (const char *locale) +{ + char *locale_dir; + + locale_dir = grub_env_get ("locale_dir"); + if (locale_dir == NULL) + { + grub_dprintf ("gettext", "locale_dir variable is not set up.\n"); + return; + } + + fd_mo = NULL; + + grub_mofile_open_lang (locale_dir, locale); + + /* ll_CC didn't work, so try ll. */ + if (fd_mo == NULL) + { + char *lang = grub_strdup (locale); + char *underscore = grub_strchr (lang, '_'); + + if (underscore) + { + *underscore = '\0'; + grub_mofile_open_lang (locale_dir, lang); + } + + grub_free (lang); + } + + if (fd_mo) + { + grub_gettext_offsetoriginal = + grub_gettext_get_info (GETTEXT_OFFSET_ORIGINAL); + grub_gettext_max = grub_gettext_get_info (GETTEXT_NUMBER_OF_STRINGS); + + grub_gettext_original = grub_gettext; + grub_gettext = grub_gettext_translate; + } +} + +static void +grub_gettext_delete_list (void) +{ + while (grub_gettext_msg_list) + { + grub_free ((char *) grub_gettext_msg_list->name); + grub_gettext_msg_list = grub_gettext_msg_list->next; + /* Don't delete the translated message because could be in use. */ + } +} + +static char * +grub_gettext_env_write_lang (struct grub_env_var *var + __attribute__ ((unused)), const char *val) +{ + grub_gettext_init_ext (val); + + grub_gettext_delete_list (); + + return grub_strdup (val); +} + +static grub_err_t +grub_cmd_translate (grub_command_t cmd __attribute__ ((unused)), + int argc, char **args) +{ + if (argc != 1) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "text to translate required"); + + const char *translation; + translation = grub_gettext_translate (args[0]); + grub_printf ("%s\n", translation); + return 0; +} + +GRUB_MOD_INIT (gettext) +{ + (void) mod; /* To stop warning. */ + + const char *lang; + + lang = grub_env_get ("lang"); + + grub_gettext_init_ext (lang); + + grub_register_command_p1 ("gettext", grub_cmd_translate, + N_("STRING"), + N_("Translates the string with the current settings.")); + + /* Reload .mo file information if lang changes. */ + grub_register_variable_hook ("lang", NULL, grub_gettext_env_write_lang); + + /* Preserve hooks after context changes. */ + grub_env_export ("lang"); +} + +GRUB_MOD_FINI (gettext) +{ + if (fd_mo != 0) + grub_file_close (fd_mo); + + grub_gettext_delete_list (); + + grub_gettext = grub_gettext_original; +} |