Jonathan Nieder | 3095522 | 2011-02-22 23:41:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2010 Ævar Arnfjörð Bjarmason |
| 3 | */ |
| 4 | |
| 5 | #include "git-compat-util.h" |
| 6 | #include "gettext.h" |
Nguyễn Thái Ngọc Duy | 754395d | 2012-09-04 17:39:35 +0700 | [diff] [blame] | 7 | #include "strbuf.h" |
| 8 | #include "utf8.h" |
Jonathan Nieder | 3095522 | 2011-02-22 23:41:22 +0000 | [diff] [blame] | 9 | |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 10 | #ifndef NO_GETTEXT |
| 11 | # include <locale.h> |
| 12 | # include <libintl.h> |
| 13 | # ifdef HAVE_LIBCHARSET_H |
| 14 | # include <libcharset.h> |
| 15 | # else |
| 16 | # include <langinfo.h> |
| 17 | # define locale_charset() nl_langinfo(CODESET) |
| 18 | # endif |
| 19 | #endif |
| 20 | |
| 21 | #ifdef GETTEXT_POISON |
Jonathan Nieder | 3095522 | 2011-02-22 23:41:22 +0000 | [diff] [blame] | 22 | int use_gettext_poison(void) |
| 23 | { |
| 24 | static int poison_requested = -1; |
| 25 | if (poison_requested == -1) |
| 26 | poison_requested = getenv("GIT_GETTEXT_POISON") ? 1 : 0; |
| 27 | return poison_requested; |
| 28 | } |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 29 | #endif |
| 30 | |
| 31 | #ifndef NO_GETTEXT |
Nguyễn Thái Ngọc Duy | 9c0495d | 2013-12-01 09:45:38 +0700 | [diff] [blame] | 32 | static int test_vsnprintf(const char *fmt, ...) |
| 33 | { |
| 34 | char buf[26]; |
| 35 | int ret; |
| 36 | va_list ap; |
| 37 | va_start(ap, fmt); |
| 38 | ret = vsnprintf(buf, sizeof(buf), fmt, ap); |
| 39 | va_end(ap); |
| 40 | return ret; |
| 41 | } |
| 42 | |
Nguyễn Thái Ngọc Duy | 754395d | 2012-09-04 17:39:35 +0700 | [diff] [blame] | 43 | static const char *charset; |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 44 | static void init_gettext_charset(const char *domain) |
| 45 | { |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 46 | /* |
| 47 | This trick arranges for messages to be emitted in the user's |
| 48 | requested encoding, but avoids setting LC_CTYPE from the |
| 49 | environment for the whole program. |
| 50 | |
| 51 | This primarily done to avoid a bug in vsnprintf in the GNU C |
| 52 | Library [1]. which triggered a "your vsnprintf is broken" error |
| 53 | on Git's own repository when inspecting v0.99.6~1 under a UTF-8 |
| 54 | locale. |
| 55 | |
| 56 | That commit contains a ISO-8859-1 encoded author name, which |
| 57 | the locale aware vsnprintf(3) won't interpolate in the format |
| 58 | argument, due to mismatch between the data encoding and the |
| 59 | locale. |
| 60 | |
| 61 | Even if it wasn't for that bug we wouldn't want to use LC_CTYPE at |
| 62 | this point, because it'd require auditing all the code that uses C |
| 63 | functions whose semantics are modified by LC_CTYPE. |
| 64 | |
| 65 | But only setting LC_MESSAGES as we do creates a problem, since |
| 66 | we declare the encoding of our PO files[2] the gettext |
| 67 | implementation will try to recode it to the user's locale, but |
| 68 | without LC_CTYPE it'll emit something like this on 'git init' |
| 69 | under the Icelandic locale: |
| 70 | |
| 71 | Bj? til t?ma Git lind ? /hlagh/.git/ |
| 72 | |
| 73 | Gettext knows about the encoding of our PO file, but we haven't |
| 74 | told it about the user's encoding, so all the non-US-ASCII |
| 75 | characters get encoded to question marks. |
| 76 | |
| 77 | But we're in luck! We can set LC_CTYPE from the environment |
| 78 | only while we call nl_langinfo and |
| 79 | bind_textdomain_codeset. That suffices to tell gettext what |
| 80 | encoding it should emit in, so it'll now say: |
| 81 | |
| 82 | Bjó til tóma Git lind í /hlagh/.git/ |
| 83 | |
| 84 | And the equivalent ISO-8859-1 string will be emitted under a |
| 85 | ISO-8859-1 locale. |
| 86 | |
| 87 | With this change way we get the advantages of setting LC_CTYPE |
| 88 | (talk to the user in his language/encoding), without the major |
| 89 | drawbacks (changed semantics for C functions we rely on). |
| 90 | |
| 91 | However foreign functions using other message catalogs that |
| 92 | aren't using our neat trick will still have a problem, e.g. if |
| 93 | we have to call perror(3): |
| 94 | |
| 95 | #include <stdio.h> |
| 96 | #include <locale.h> |
| 97 | #include <errno.h> |
| 98 | |
| 99 | int main(void) |
| 100 | { |
| 101 | setlocale(LC_MESSAGES, ""); |
| 102 | setlocale(LC_CTYPE, "C"); |
| 103 | errno = ENODEV; |
| 104 | perror("test"); |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | Running that will give you a message with question marks: |
| 109 | |
| 110 | $ LANGUAGE= LANG=de_DE.utf8 ./test |
| 111 | test: Kein passendes Ger?t gefunden |
| 112 | |
Nguyễn Thái Ngọc Duy | 9c0495d | 2013-12-01 09:45:38 +0700 | [diff] [blame] | 113 | The vsnprintf bug has been fixed since glibc 2.17. |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 114 | |
| 115 | Then we could simply set LC_CTYPE from the environment, which would |
| 116 | make things like the external perror(3) messages work. |
| 117 | |
| 118 | See t/t0203-gettext-setlocale-sanity.sh's "gettext.c" tests for |
| 119 | regression tests. |
| 120 | |
| 121 | 1. http://sourceware.org/bugzilla/show_bug.cgi?id=6530 |
| 122 | 2. E.g. "Content-Type: text/plain; charset=UTF-8\n" in po/is.po |
| 123 | */ |
| 124 | setlocale(LC_CTYPE, ""); |
| 125 | charset = locale_charset(); |
| 126 | bind_textdomain_codeset(domain, charset); |
Nguyễn Thái Ngọc Duy | 9c0495d | 2013-12-01 09:45:38 +0700 | [diff] [blame] | 127 | /* the string is taken from v0.99.6~1 */ |
| 128 | if (test_vsnprintf("%.*s", 13, "David_K\345gedal") < 0) |
| 129 | setlocale(LC_CTYPE, "C"); |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | void git_setup_gettext(void) |
| 133 | { |
| 134 | const char *podir = getenv("GIT_TEXTDOMAINDIR"); |
| 135 | |
| 136 | if (!podir) |
| 137 | podir = GIT_LOCALE_PATH; |
| 138 | bindtextdomain("git", podir); |
| 139 | setlocale(LC_MESSAGES, ""); |
| 140 | init_gettext_charset("git"); |
| 141 | textdomain("git"); |
| 142 | } |
Nguyễn Thái Ngọc Duy | 754395d | 2012-09-04 17:39:35 +0700 | [diff] [blame] | 143 | |
| 144 | /* return the number of columns of string 's' in current locale */ |
| 145 | int gettext_width(const char *s) |
| 146 | { |
| 147 | static int is_utf8 = -1; |
| 148 | if (is_utf8 == -1) |
| 149 | is_utf8 = !strcmp(charset, "UTF-8"); |
| 150 | |
| 151 | return is_utf8 ? utf8_strwidth(s) : strlen(s); |
| 152 | } |
Ævar Arnfjörð Bjarmason | 5e9637c | 2011-11-18 00:14:42 +0100 | [diff] [blame] | 153 | #endif |