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30955229 JN |
1 | /* |
2 | * Copyright (c) 2010 Ævar Arnfjörð Bjarmason | |
3 | */ | |
4 | ||
5 | #include "git-compat-util.h" | |
6 | #include "gettext.h" | |
754395d3 NTND |
7 | #include "strbuf.h" |
8 | #include "utf8.h" | |
30955229 | 9 | |
5e9637c6 ÆAB |
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 | |
30955229 JN |
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 | } | |
5e9637c6 ÆAB |
29 | #endif |
30 | ||
31 | #ifndef NO_GETTEXT | |
9c0495d2 NTND |
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 | ||
754395d3 | 43 | static const char *charset; |
5e9637c6 ÆAB |
44 | static void init_gettext_charset(const char *domain) |
45 | { | |
5e9637c6 ÆAB |
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 | ||
9c0495d2 | 113 | The vsnprintf bug has been fixed since glibc 2.17. |
5e9637c6 ÆAB |
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); | |
9c0495d2 NTND |
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"); | |
5e9637c6 ÆAB |
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 | } | |
754395d3 NTND |
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 | } | |
5e9637c6 | 153 | #endif |