mingw/msvc: use the new-style RUNTIME_PREFIX helper
[git/git.git] / gettext.c
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30955229
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1/*
2 * Copyright (c) 2010 Ævar Arnfjörð Bjarmason
3 */
4
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5#include "cache.h"
6#include "exec_cmd.h"
30955229 7#include "gettext.h"
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8#include "strbuf.h"
9#include "utf8.h"
30955229 10
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11#ifndef NO_GETTEXT
12# include <locale.h>
13# include <libintl.h>
14# ifdef HAVE_LIBCHARSET_H
15# include <libcharset.h>
16# else
17# include <langinfo.h>
18# define locale_charset() nl_langinfo(CODESET)
19# endif
20#endif
21
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22static const char *charset;
23
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24/*
25 * Guess the user's preferred languages from the value in LANGUAGE environment
26 * variable and LC_MESSAGES locale category if NO_GETTEXT is not defined.
27 *
28 * The result can be a colon-separated list like "ko:ja:en".
29 */
30const char *get_preferred_languages(void)
31{
32 const char *retval;
33
34 retval = getenv("LANGUAGE");
35 if (retval && *retval)
36 return retval;
37
38#ifndef NO_GETTEXT
39 retval = setlocale(LC_MESSAGES, NULL);
40 if (retval && *retval &&
41 strcmp(retval, "C") &&
42 strcmp(retval, "POSIX"))
43 return retval;
44#endif
45
46 return NULL;
47}
48
5e9637c6 49#ifdef GETTEXT_POISON
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50int use_gettext_poison(void)
51{
52 static int poison_requested = -1;
53 if (poison_requested == -1)
54 poison_requested = getenv("GIT_GETTEXT_POISON") ? 1 : 0;
55 return poison_requested;
56}
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57#endif
58
59#ifndef NO_GETTEXT
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60static int test_vsnprintf(const char *fmt, ...)
61{
62 char buf[26];
63 int ret;
64 va_list ap;
65 va_start(ap, fmt);
66 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
67 va_end(ap);
68 return ret;
69}
70
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71static void init_gettext_charset(const char *domain)
72{
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73 /*
74 This trick arranges for messages to be emitted in the user's
75 requested encoding, but avoids setting LC_CTYPE from the
76 environment for the whole program.
77
78 This primarily done to avoid a bug in vsnprintf in the GNU C
79 Library [1]. which triggered a "your vsnprintf is broken" error
80 on Git's own repository when inspecting v0.99.6~1 under a UTF-8
81 locale.
82
83 That commit contains a ISO-8859-1 encoded author name, which
84 the locale aware vsnprintf(3) won't interpolate in the format
85 argument, due to mismatch between the data encoding and the
86 locale.
87
88 Even if it wasn't for that bug we wouldn't want to use LC_CTYPE at
89 this point, because it'd require auditing all the code that uses C
90 functions whose semantics are modified by LC_CTYPE.
91
92 But only setting LC_MESSAGES as we do creates a problem, since
93 we declare the encoding of our PO files[2] the gettext
94 implementation will try to recode it to the user's locale, but
95 without LC_CTYPE it'll emit something like this on 'git init'
96 under the Icelandic locale:
97
98 Bj? til t?ma Git lind ? /hlagh/.git/
99
100 Gettext knows about the encoding of our PO file, but we haven't
101 told it about the user's encoding, so all the non-US-ASCII
102 characters get encoded to question marks.
103
104 But we're in luck! We can set LC_CTYPE from the environment
105 only while we call nl_langinfo and
106 bind_textdomain_codeset. That suffices to tell gettext what
107 encoding it should emit in, so it'll now say:
108
109 Bjó til tóma Git lind í /hlagh/.git/
110
111 And the equivalent ISO-8859-1 string will be emitted under a
112 ISO-8859-1 locale.
113
114 With this change way we get the advantages of setting LC_CTYPE
115 (talk to the user in his language/encoding), without the major
116 drawbacks (changed semantics for C functions we rely on).
117
118 However foreign functions using other message catalogs that
119 aren't using our neat trick will still have a problem, e.g. if
120 we have to call perror(3):
121
122 #include <stdio.h>
123 #include <locale.h>
124 #include <errno.h>
125
126 int main(void)
127 {
128 setlocale(LC_MESSAGES, "");
129 setlocale(LC_CTYPE, "C");
130 errno = ENODEV;
131 perror("test");
132 return 0;
133 }
134
135 Running that will give you a message with question marks:
136
137 $ LANGUAGE= LANG=de_DE.utf8 ./test
138 test: Kein passendes Ger?t gefunden
139
9c0495d2 140 The vsnprintf bug has been fixed since glibc 2.17.
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141
142 Then we could simply set LC_CTYPE from the environment, which would
143 make things like the external perror(3) messages work.
144
145 See t/t0203-gettext-setlocale-sanity.sh's "gettext.c" tests for
146 regression tests.
147
148 1. http://sourceware.org/bugzilla/show_bug.cgi?id=6530
149 2. E.g. "Content-Type: text/plain; charset=UTF-8\n" in po/is.po
150 */
151 setlocale(LC_CTYPE, "");
152 charset = locale_charset();
153 bind_textdomain_codeset(domain, charset);
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154 /* the string is taken from v0.99.6~1 */
155 if (test_vsnprintf("%.*s", 13, "David_K\345gedal") < 0)
156 setlocale(LC_CTYPE, "C");
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157}
158
159void git_setup_gettext(void)
160{
226c0ddd 161 const char *podir = getenv(GIT_TEXT_DOMAIN_DIR_ENVIRONMENT);
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162
163 if (!podir)
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164 podir = system_path(GIT_LOCALE_PATH);
165
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166 bindtextdomain("git", podir);
167 setlocale(LC_MESSAGES, "");
aa1462cc 168 setlocale(LC_TIME, "");
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169 init_gettext_charset("git");
170 textdomain("git");
171}
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172
173/* return the number of columns of string 's' in current locale */
174int gettext_width(const char *s)
175{
176 static int is_utf8 = -1;
177 if (is_utf8 == -1)
e8c16726 178 is_utf8 = is_utf8_locale();
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179
180 return is_utf8 ? utf8_strwidth(s) : strlen(s);
181}
5e9637c6 182#endif
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183
184int is_utf8_locale(void)
185{
186#ifdef NO_GETTEXT
187 if (!charset) {
188 const char *env = getenv("LC_ALL");
189 if (!env || !*env)
190 env = getenv("LC_CTYPE");
191 if (!env || !*env)
192 env = getenv("LANG");
193 if (!env)
194 env = "";
195 if (strchr(env, '.'))
196 env = strchr(env, '.') + 1;
197 charset = xstrdup(env);
198 }
199#endif
200 return is_encoding_utf8(charset);
201}