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30955229 JN |
1 | /* |
2 | * Copyright (c) 2010 Ævar Arnfjörð Bjarmason | |
3 | */ | |
4 | ||
226c0ddd | 5 | #include "cache.h" |
92034a9c | 6 | #include "exec-cmd.h" |
30955229 | 7 | #include "gettext.h" |
754395d3 NTND |
8 | #include "strbuf.h" |
9 | #include "utf8.h" | |
6cdccfce | 10 | #include "config.h" |
30955229 | 11 | |
5e9637c6 ÆAB |
12 | #ifndef NO_GETTEXT |
13 | # include <locale.h> | |
14 | # include <libintl.h> | |
090d1e84 KB |
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 | |
5e9637c6 ÆAB |
34 | # include <libcharset.h> |
35 | # else | |
36 | # include <langinfo.h> | |
37 | # define locale_charset() nl_langinfo(CODESET) | |
38 | # endif | |
39 | #endif | |
40 | ||
e8c16726 NTND |
41 | static const char *charset; |
42 | ||
93f7d910 JK |
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 | ||
30955229 JN |
68 | int use_gettext_poison(void) |
69 | { | |
70 | static int poison_requested = -1; | |
6cdccfce ÆAB |
71 | if (poison_requested == -1) { |
72 | const char *v = getenv("GIT_TEST_GETTEXT_POISON"); | |
73 | poison_requested = v && strlen(v) ? 1 : 0; | |
74 | } | |
30955229 JN |
75 | return poison_requested; |
76 | } | |
5e9637c6 ÆAB |
77 | |
78 | #ifndef NO_GETTEXT | |
9c0495d2 NTND |
79 | static int test_vsnprintf(const char *fmt, ...) |
80 | { | |
81 | char buf[26]; | |
82 | int ret; | |
83 | va_list ap; | |
84 | va_start(ap, fmt); | |
85 | ret = vsnprintf(buf, sizeof(buf), fmt, ap); | |
86 | va_end(ap); | |
87 | return ret; | |
88 | } | |
89 | ||
5e9637c6 ÆAB |
90 | static void init_gettext_charset(const char *domain) |
91 | { | |
5e9637c6 ÆAB |
92 | /* |
93 | This trick arranges for messages to be emitted in the user's | |
94 | requested encoding, but avoids setting LC_CTYPE from the | |
95 | environment for the whole program. | |
96 | ||
97 | This primarily done to avoid a bug in vsnprintf in the GNU C | |
98 | Library [1]. which triggered a "your vsnprintf is broken" error | |
99 | on Git's own repository when inspecting v0.99.6~1 under a UTF-8 | |
100 | locale. | |
101 | ||
102 | That commit contains a ISO-8859-1 encoded author name, which | |
103 | the locale aware vsnprintf(3) won't interpolate in the format | |
104 | argument, due to mismatch between the data encoding and the | |
105 | locale. | |
106 | ||
107 | Even if it wasn't for that bug we wouldn't want to use LC_CTYPE at | |
108 | this point, because it'd require auditing all the code that uses C | |
109 | functions whose semantics are modified by LC_CTYPE. | |
110 | ||
111 | But only setting LC_MESSAGES as we do creates a problem, since | |
112 | we declare the encoding of our PO files[2] the gettext | |
113 | implementation will try to recode it to the user's locale, but | |
114 | without LC_CTYPE it'll emit something like this on 'git init' | |
115 | under the Icelandic locale: | |
116 | ||
117 | Bj? til t?ma Git lind ? /hlagh/.git/ | |
118 | ||
119 | Gettext knows about the encoding of our PO file, but we haven't | |
120 | told it about the user's encoding, so all the non-US-ASCII | |
121 | characters get encoded to question marks. | |
122 | ||
123 | But we're in luck! We can set LC_CTYPE from the environment | |
124 | only while we call nl_langinfo and | |
125 | bind_textdomain_codeset. That suffices to tell gettext what | |
126 | encoding it should emit in, so it'll now say: | |
127 | ||
128 | Bjó til tóma Git lind í /hlagh/.git/ | |
129 | ||
130 | And the equivalent ISO-8859-1 string will be emitted under a | |
131 | ISO-8859-1 locale. | |
132 | ||
133 | With this change way we get the advantages of setting LC_CTYPE | |
134 | (talk to the user in his language/encoding), without the major | |
135 | drawbacks (changed semantics for C functions we rely on). | |
136 | ||
137 | However foreign functions using other message catalogs that | |
138 | aren't using our neat trick will still have a problem, e.g. if | |
139 | we have to call perror(3): | |
140 | ||
141 | #include <stdio.h> | |
142 | #include <locale.h> | |
143 | #include <errno.h> | |
144 | ||
145 | int main(void) | |
146 | { | |
147 | setlocale(LC_MESSAGES, ""); | |
148 | setlocale(LC_CTYPE, "C"); | |
149 | errno = ENODEV; | |
150 | perror("test"); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | Running that will give you a message with question marks: | |
155 | ||
156 | $ LANGUAGE= LANG=de_DE.utf8 ./test | |
157 | test: Kein passendes Ger?t gefunden | |
158 | ||
9c0495d2 | 159 | The vsnprintf bug has been fixed since glibc 2.17. |
5e9637c6 ÆAB |
160 | |
161 | Then we could simply set LC_CTYPE from the environment, which would | |
162 | make things like the external perror(3) messages work. | |
163 | ||
164 | See t/t0203-gettext-setlocale-sanity.sh's "gettext.c" tests for | |
165 | regression tests. | |
166 | ||
167 | 1. http://sourceware.org/bugzilla/show_bug.cgi?id=6530 | |
168 | 2. E.g. "Content-Type: text/plain; charset=UTF-8\n" in po/is.po | |
169 | */ | |
170 | setlocale(LC_CTYPE, ""); | |
171 | charset = locale_charset(); | |
172 | bind_textdomain_codeset(domain, charset); | |
9c0495d2 NTND |
173 | /* the string is taken from v0.99.6~1 */ |
174 | if (test_vsnprintf("%.*s", 13, "David_K\345gedal") < 0) | |
175 | setlocale(LC_CTYPE, "C"); | |
5e9637c6 ÆAB |
176 | } |
177 | ||
178 | void git_setup_gettext(void) | |
179 | { | |
226c0ddd | 180 | const char *podir = getenv(GIT_TEXT_DOMAIN_DIR_ENVIRONMENT); |
0210231b | 181 | char *p = NULL; |
5e9637c6 ÆAB |
182 | |
183 | if (!podir) | |
0210231b | 184 | podir = p = system_path(GIT_LOCALE_PATH); |
226c0ddd | 185 | |
6cdccfce ÆAB |
186 | use_gettext_poison(); /* getenv() reentrancy paranoia */ |
187 | ||
0210231b JS |
188 | if (!is_directory(podir)) { |
189 | free(p); | |
cc5e1bf9 | 190 | return; |
0210231b | 191 | } |
226c0ddd | 192 | |
5e9637c6 ÆAB |
193 | bindtextdomain("git", podir); |
194 | setlocale(LC_MESSAGES, ""); | |
aa1462cc | 195 | setlocale(LC_TIME, ""); |
5e9637c6 ÆAB |
196 | init_gettext_charset("git"); |
197 | textdomain("git"); | |
0210231b JS |
198 | |
199 | free(p); | |
5e9637c6 | 200 | } |
754395d3 NTND |
201 | |
202 | /* return the number of columns of string 's' in current locale */ | |
203 | int gettext_width(const char *s) | |
204 | { | |
205 | static int is_utf8 = -1; | |
206 | if (is_utf8 == -1) | |
e8c16726 | 207 | is_utf8 = is_utf8_locale(); |
754395d3 NTND |
208 | |
209 | return is_utf8 ? utf8_strwidth(s) : strlen(s); | |
210 | } | |
5e9637c6 | 211 | #endif |
e8c16726 NTND |
212 | |
213 | int is_utf8_locale(void) | |
214 | { | |
215 | #ifdef NO_GETTEXT | |
216 | if (!charset) { | |
217 | const char *env = getenv("LC_ALL"); | |
218 | if (!env || !*env) | |
219 | env = getenv("LC_CTYPE"); | |
220 | if (!env || !*env) | |
221 | env = getenv("LANG"); | |
222 | if (!env) | |
223 | env = ""; | |
224 | if (strchr(env, '.')) | |
225 | env = strchr(env, '.') + 1; | |
226 | charset = xstrdup(env); | |
227 | } | |
228 | #endif | |
229 | return is_encoding_utf8(charset); | |
230 | } |