diff options
| -rw-r--r-- | common/i18n.c | 108 |
1 files changed, 104 insertions, 4 deletions
diff --git a/common/i18n.c b/common/i18n.c index e6d3f5e47..d1f157c20 100644 --- a/common/i18n.c +++ b/common/i18n.c @@ -1,5 +1,6 @@ /* i18n.c - gettext initialization - * Copyright (C) 2007, 2010 Free Software Foundation, Inc. + * 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 @@ -37,6 +38,37 @@ #include "i18n.h" +/* An object to store pointers to static strings and there static + translation. 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; + + + void i18n_init (void) { @@ -117,11 +149,79 @@ i18n_utf8 (const char *string) /* A variant of gettext which allows to specify the local to use for translating the message. The function assumes that utf-8 is used - for the encoding. FIXME: The locale back and forth switching is - likely very expensive, thus we should consider to implement our own - cache here. */ + for the encoding. */ const char * i18n_localegettext (const char *lc_messages, const char *string) { +#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES) \ + && !defined(USE_SIMPLE_GETTEXT) && defined(ENABLE_NLS) + 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 /*!(HAVE_SETLOCALE && LC_MESSAGES ...)*/ + (void)lc_messages; return _(string); +#endif /*!(HAVE_SETLOCALE && LC_MESSAGES ...)*/ } |