diff options
Diffstat (limited to 'gettext.c')
| -rw-r--r-- | gettext.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/gettext.c b/gettext.c new file mode 100644 index 0000000..db727ea --- /dev/null +++ b/gettext.c @@ -0,0 +1,199 @@ +/* + * Copyright (c) 2010 Ævar Arnfjörð Bjarmason + */ + +#include "git-compat-util.h" +#include "gettext.h" +#include "strbuf.h" +#include "utf8.h" + +#ifndef NO_GETTEXT +# include <locale.h> +# include <libintl.h> +# ifdef HAVE_LIBCHARSET_H +# include <libcharset.h> +# else +# include <langinfo.h> +# define locale_charset() nl_langinfo(CODESET) +# endif +#endif + +static const char *charset; + +/* + * Guess the user's preferred languages from the value in LANGUAGE environment + * variable and LC_MESSAGES locale category if NO_GETTEXT is not defined. + * + * The result can be a colon-separated list like "ko:ja:en". + */ +const char *get_preferred_languages(void) +{ + const char *retval; + + retval = getenv("LANGUAGE"); + if (retval && *retval) + return retval; + +#ifndef NO_GETTEXT + retval = setlocale(LC_MESSAGES, NULL); + if (retval && *retval && + strcmp(retval, "C") && + strcmp(retval, "POSIX")) + return retval; +#endif + + return NULL; +} + +#ifdef GETTEXT_POISON +int use_gettext_poison(void) +{ + static int poison_requested = -1; + if (poison_requested == -1) + poison_requested = getenv("GIT_GETTEXT_POISON") ? 1 : 0; + return poison_requested; +} +#endif + +#ifndef NO_GETTEXT +static int test_vsnprintf(const char *fmt, ...) +{ + char buf[26]; + int ret; + va_list ap; + va_start(ap, fmt); + ret = vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + return ret; +} + +static void init_gettext_charset(const char *domain) +{ + /* + This trick arranges for messages to be emitted in the user's + requested encoding, but avoids setting LC_CTYPE from the + environment for the whole program. + + This primarily done to avoid a bug in vsnprintf in the GNU C + Library [1]. which triggered a "your vsnprintf is broken" error + on Git's own repository when inspecting v0.99.6~1 under a UTF-8 + locale. + + That commit contains a ISO-8859-1 encoded author name, which + the locale aware vsnprintf(3) won't interpolate in the format + argument, due to mismatch between the data encoding and the + locale. + + Even if it wasn't for that bug we wouldn't want to use LC_CTYPE at + this point, because it'd require auditing all the code that uses C + functions whose semantics are modified by LC_CTYPE. + + But only setting LC_MESSAGES as we do creates a problem, since + we declare the encoding of our PO files[2] the gettext + implementation will try to recode it to the user's locale, but + without LC_CTYPE it'll emit something like this on 'git init' + under the Icelandic locale: + + Bj? til t?ma Git lind ? /hlagh/.git/ + + Gettext knows about the encoding of our PO file, but we haven't + told it about the user's encoding, so all the non-US-ASCII + characters get encoded to question marks. + + But we're in luck! We can set LC_CTYPE from the environment + only while we call nl_langinfo and + bind_textdomain_codeset. That suffices to tell gettext what + encoding it should emit in, so it'll now say: + + Bjó til tóma Git lind í /hlagh/.git/ + + And the equivalent ISO-8859-1 string will be emitted under a + ISO-8859-1 locale. + + With this change way we get the advantages of setting LC_CTYPE + (talk to the user in his language/encoding), without the major + drawbacks (changed semantics for C functions we rely on). + + However foreign functions using other message catalogs that + aren't using our neat trick will still have a problem, e.g. if + we have to call perror(3): + + #include <stdio.h> + #include <locale.h> + #include <errno.h> + + int main(void) + { + setlocale(LC_MESSAGES, ""); + setlocale(LC_CTYPE, "C"); + errno = ENODEV; + perror("test"); + return 0; + } + + Running that will give you a message with question marks: + + $ LANGUAGE= LANG=de_DE.utf8 ./test + test: Kein passendes Ger?t gefunden + + The vsnprintf bug has been fixed since glibc 2.17. + + Then we could simply set LC_CTYPE from the environment, which would + make things like the external perror(3) messages work. + + See t/t0203-gettext-setlocale-sanity.sh's "gettext.c" tests for + regression tests. + + 1. http://sourceware.org/bugzilla/show_bug.cgi?id=6530 + 2. E.g. "Content-Type: text/plain; charset=UTF-8\n" in po/is.po + */ + setlocale(LC_CTYPE, ""); + charset = locale_charset(); + bind_textdomain_codeset(domain, charset); + /* the string is taken from v0.99.6~1 */ + if (test_vsnprintf("%.*s", 13, "David_K\345gedal") < 0) + setlocale(LC_CTYPE, "C"); +} + +void git_setup_gettext(void) +{ + const char *podir = getenv("GIT_TEXTDOMAINDIR"); + + if (!podir) + podir = GIT_LOCALE_PATH; + bindtextdomain("git", podir); + setlocale(LC_MESSAGES, ""); + setlocale(LC_TIME, ""); + init_gettext_charset("git"); + textdomain("git"); +} + +/* return the number of columns of string 's' in current locale */ +int gettext_width(const char *s) +{ + static int is_utf8 = -1; + if (is_utf8 == -1) + is_utf8 = is_utf8_locale(); + + return is_utf8 ? utf8_strwidth(s) : strlen(s); +} +#endif + +int is_utf8_locale(void) +{ +#ifdef NO_GETTEXT + if (!charset) { + const char *env = getenv("LC_ALL"); + if (!env || !*env) + env = getenv("LC_CTYPE"); + if (!env || !*env) + env = getenv("LANG"); + if (!env) + env = ""; + if (strchr(env, '.')) + env = strchr(env, '.') + 1; + charset = xstrdup(env); + } +#endif + return is_encoding_utf8(charset); +} |