gettext.c

   1 /*
   2  * Copyright (c) 2010 Ævar Arnfjörð Bjarmason
   3  */
   4
   5 #include "cache.h"
   6 #include "exec-cmd.h"
   7 #include "gettext.h"
   8 #include "strbuf.h"
   9 #include "utf8.h"
  10 #include "config.h"
  11
  12 #ifndef NO_GETTEXT
  13 #       include <locale.h>
  14 #       include <libintl.h>
  15 #       ifdef GIT_WINDOWS_NATIVE
  16
  17 static const char *locale_charset(void)
  18 {
  19         const char *env = getenv("LC_ALL"), *dot;
  20
  21         if (!env || !*env)
  22                 env = getenv("LC_CTYPE");
  23         if (!env || !*env)
  24                 env = getenv("LANG");
  25
  26         if (!env)
  27                 return "UTF-8";
  28
  29         dot = strchr(env, '.');
  30         return !dot ? env : dot + 1;
  31 }
  32
  33 #       elif defined HAVE_LIBCHARSET_H
  34 #               include <libcharset.h>
  35 #       else
  36 #               include <langinfo.h>
  37 #               define locale_charset() nl_langinfo(CODESET)
  38 #       endif
  39 #endif
  40
  41 static const char *charset;
  42
  43 /*
  44  * Guess the user's preferred languages from the value in LANGUAGE environment
  45  * variable and LC_MESSAGES locale category if NO_GETTEXT is not defined.
  46  *
  47  * The result can be a colon-separated list like "ko:ja:en".
  48  */
  49 const char *get_preferred_languages(void)
  50 {
  51         const char *retval;
  52
  53         retval = getenv("LANGUAGE");
  54         if (retval && *retval)
  55                 return retval;
  56
  57 #ifndef NO_GETTEXT
  58         retval = setlocale(LC_MESSAGES, NULL);
  59         if (retval && *retval &&
  60                 strcmp(retval, "C") &&
  61                 strcmp(retval, "POSIX"))
  62                 return retval;
  63 #endif
  64
  65         return NULL;
  66 }
  67
  68 #ifndef NO_GETTEXT
  69 __attribute__((format (printf, 1, 2)))
  70 static int test_vsnprintf(const char *fmt, ...)
  71 {
  72         char buf[26];
  73         int ret;
  74         va_list ap;
  75         va_start(ap, fmt);
  76         ret = vsnprintf(buf, sizeof(buf), fmt, ap);
  77         va_end(ap);
  78         return ret;
  79 }
  80
  81 static void init_gettext_charset(const char *domain)
  82 {
  83         setlocale(LC_CTYPE, "");
  84         charset = locale_charset();
  85         bind_textdomain_codeset(domain, charset);
  86
  87         /*
  88          * Work around an old bug fixed in glibc 2.17 (released on
  89          * 2012-12-24), at the cost of potentially making translated
  90          * messages from external functions like perror() emitted in
  91          * the wrong encoding.
  92          *
  93          * The bug affected e.g. git.git's own 7eb93c89651 ([PATCH]
  94          * Simplify git script, 2005-09-07), which is the origin of
  95          * the "David_K\345gedal" test string.
  96          *
  97          * See a much longer comment added to this file in 5e9637c6297
  98          * (i18n: add infrastructure for translating Git with gettext,
  99          * 2011-11-18) for more details.
 100          */
 101         if (test_vsnprintf("%.*s", 13, "David_K\345gedal") < 0)
 102                 setlocale(LC_CTYPE, "C");
 103 }
 104
 105 void git_setup_gettext(void)
 106 {
 107         const char *podir = getenv(GIT_TEXT_DOMAIN_DIR_ENVIRONMENT);
 108         char *p = NULL;
 109
 110         if (!podir)
 111                 podir = p = system_path(GIT_LOCALE_PATH);
 112
 113         if (!is_directory(podir)) {
 114                 free(p);
 115                 return;
 116         }
 117
 118         bindtextdomain("git", podir);
 119         setlocale(LC_MESSAGES, "");
 120         setlocale(LC_TIME, "");
 121         init_gettext_charset("git");
 122         textdomain("git");
 123
 124         free(p);
 125 }
 126
 127 /* return the number of columns of string 's' in current locale */
 128 int gettext_width(const char *s)
 129 {
 130         static int is_utf8 = -1;
 131         if (is_utf8 == -1)
 132                 is_utf8 = is_utf8_locale();
 133
 134         return is_utf8 ? utf8_strwidth(s) : strlen(s);
 135 }
 136 #endif
 137
 138 int is_utf8_locale(void)
 139 {
 140 #ifdef NO_GETTEXT
 141         if (!charset) {
 142                 const char *env = getenv("LC_ALL");
 143                 if (!env || !*env)
 144                         env = getenv("LC_CTYPE");
 145                 if (!env || !*env)
 146                         env = getenv("LANG");
 147                 if (!env)
 148                         env = "";
 149                 if (strchr(env, '.'))
 150                         env = strchr(env, '.') + 1;
 151                 charset = xstrdup(env);
 152         }
 153 #endif
 154         return is_encoding_utf8(charset);
 155 }