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Diffstat (limited to 'common/i18n.c')
| -rw-r--r-- | common/i18n.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/common/i18n.c b/common/i18n.c new file mode 100644 index 0000000..b5a2864 --- /dev/null +++ b/common/i18n.c @@ -0,0 +1,237 @@ +/* i18n.c - gettext initialization + * Copyright (C) 2007, 2010 Free Software Foundation, Inc. + * Copyright (C) 2015 g10 Code GmbH + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of either + * + * - the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at + * your option) any later version. + * + * or + * + * - the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * or both in parallel, as here. + * + * This file 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 this program; if not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#ifdef HAVE_LOCALE_H +#include <locale.h> +#endif +#ifdef HAVE_LANGINFO_CODESET +#include <langinfo.h> +#endif + +#include "util.h" +#include "i18n.h" + + +#undef USE_MSGCACHE +#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES) \ + && !defined(USE_SIMPLE_GETTEXT) && defined(ENABLE_NLS) +# define USE_MSGCACHE 1 +#endif + + +#ifdef USE_MSGCACHE +/* An object to store pointers to static strings and their static + translations. A linked list is not optimal but given that we only + have a few dozen messages it should be acceptable. */ +struct msg_cache_s +{ + struct msg_cache_s *next; + const char *key; + const char *value; +}; + +/* A object to store an lc_messages string and a link to the cache + object. */ +struct msg_cache_heads_s +{ + struct msg_cache_heads_s *next; + struct msg_cache_s *cache; + char lc_messages[1]; +}; + +/* Out static cache of translated messages. We need this because + there is no gettext API to return a translation depending on the + locale. Switching the locale for each access to a translatable + string seems to be too expensive. Note that this is used only for + strings in gpg-agent which are passed to Pinentry. All other + strings are using the regular gettext interface. Note that we can + never release this memory because consumers take the result as + static strings. */ +static struct msg_cache_heads_s *msgcache; + +#endif /*USE_MSGCACHE*/ + + +void +i18n_init (void) +{ +#ifdef USE_SIMPLE_GETTEXT + bindtextdomain (PACKAGE_GT, gnupg_localedir ()); + textdomain (PACKAGE_GT); +#else +# ifdef ENABLE_NLS + setlocale (LC_ALL, "" ); + bindtextdomain (PACKAGE_GT, LOCALEDIR); + textdomain (PACKAGE_GT); +# endif +#endif +} + + +/* The Assuan agent protocol requires us to transmit utf-8 strings + thus we need a way to temporary switch gettext from native to + utf8. */ +char * +i18n_switchto_utf8 (void) +{ +#ifdef USE_SIMPLE_GETTEXT + /* Return an arbitrary pointer as true value. */ + return gettext_use_utf8 (1) ? (char*)(-1) : NULL; +#elif defined(ENABLE_NLS) + char *orig_codeset = bind_textdomain_codeset (PACKAGE_GT, NULL); +# ifdef HAVE_LANGINFO_CODESET + if (!orig_codeset) + orig_codeset = nl_langinfo (CODESET); +# endif + if (orig_codeset) + { /* We only switch when we are able to restore the codeset later. + Note that bind_textdomain_codeset does only return on memory + errors but not if a codeset is not available. Thus we don't + bother printing a diagnostic here. */ + orig_codeset = xstrdup (orig_codeset); + if (!bind_textdomain_codeset (PACKAGE_GT, "utf-8")) + { + xfree (orig_codeset); + orig_codeset = NULL; + } + } + return orig_codeset; +#else + return NULL; +#endif +} + +/* Switch back to the saved codeset. */ +void +i18n_switchback (char *saved_codeset) +{ +#ifdef USE_SIMPLE_GETTEXT + gettext_use_utf8 (!!saved_codeset); +#elif defined(ENABLE_NLS) + if (saved_codeset) + { + bind_textdomain_codeset (PACKAGE_GT, saved_codeset); + xfree (saved_codeset); + } +#else + (void)saved_codeset; +#endif +} + + +/* Gettext variant which temporary switches to utf-8 for string. */ +const char * +i18n_utf8 (const char *string) +{ + char *saved = i18n_switchto_utf8 (); + const char *result = _(string); + i18n_switchback (saved); + return result; +} + + +/* A variant of gettext which allows the programmer to specify the + locale to use for translating the message. The function assumes + that utf-8 is used for the encoding. */ +const char * +i18n_localegettext (const char *lc_messages, const char *string) +{ +#if USE_MSGCACHE + const char *result = NULL; + char *saved = NULL; + struct msg_cache_heads_s *mh; + struct msg_cache_s *mc; + + if (!lc_messages) + goto leave; + + /* Lookup in the cache. */ + for (mh = msgcache; mh; mh = mh->next) + if (!strcmp (mh->lc_messages, lc_messages)) + break; + if (mh) + { + /* A cache entry for this local exists - find the string. + Because the system is designed for static strings it is + sufficient to compare the pointers. */ + for (mc = mh->cache; mc; mc = mc->next) + if (mc->key == string) + { + /* Cache hit. */ + result = mc->value; + goto leave; + } + } + + /* Cached miss. Change the locale, translate, reset locale. */ + saved = setlocale (LC_MESSAGES, NULL); + if (!saved) + goto leave; + saved = xtrystrdup (saved); + if (!saved) + goto leave; + if (!setlocale (LC_MESSAGES, lc_messages)) + goto leave; + + bindtextdomain (PACKAGE_GT, LOCALEDIR); + result = gettext (string); + setlocale (LC_MESSAGES, saved); + bindtextdomain (PACKAGE_GT, LOCALEDIR); + + /* Cache the result. */ + if (!mh) + { + /* First use of this locale - create an entry. */ + mh = xtrymalloc (sizeof *mh + strlen (lc_messages)); + if (!mh) + goto leave; + strcpy (mh->lc_messages, lc_messages); + mh->cache = NULL; + mh->next = msgcache; + msgcache = mh; + } + mc = xtrymalloc (sizeof *mc); + if (!mc) + goto leave; + mc->key = string; + mc->value = result; + mc->next = mh->cache; + mh->cache = mc; + + leave: + xfree (saved); + return result? result : _(string); + +#else /*!USE_MSGCACHE*/ + + (void)lc_messages; + return _(string); + +#endif /*!USE_MSGCACHE*/ +} |