8a731dfa |
1 | /* |
2 | * locale.c: try very hard to figure out the libcharset charset |
3 | * identifier corresponding to the current C library locale. |
4 | * |
5 | * This function works by calling nl_langinfo(CODESET) if |
6 | * available; failing that, it will try to figure it out manually |
7 | * by examining the locale environment variables. Code for the |
8 | * latter is adapted from Markus Kuhn's public-domain |
9 | * implementation of nl_langinfo(CODESET), available at |
10 | * |
11 | * http://www.cl.cam.ac.uk/~mgk25/ucs/langinfo.c |
12 | */ |
13 | |
14 | #include <stdlib.h> |
15 | #include <string.h> |
16 | #include "charset.h" |
17 | |
18 | #ifdef HAS_LANGINFO_CODESET |
19 | #include "langinfo.h" |
20 | #endif |
21 | |
22 | int charset_from_locale(void) |
23 | { |
24 | char *l, *p; |
25 | |
26 | #ifdef HAS_LANGINFO_CODESET |
27 | int charset; |
28 | char const *csname; |
29 | |
30 | csname = nl_langinfo(CODESET); |
31 | if (csname && |
32 | (charset = charset_from_localenc(csname)) != CS_NONE) |
33 | return charset; |
34 | #endif |
35 | |
36 | if (((l = getenv("LC_ALL")) && *l) || |
37 | ((l = getenv("LC_CTYPE")) && *l) || |
38 | ((l = getenv("LANG")) && *l)) { |
39 | /* check standardized locales */ |
40 | if (!strcmp(l, "C") || !strcmp(l, "POSIX")) |
41 | return CS_ASCII; |
42 | /* check for encoding name fragment */ |
43 | if (strstr(l, "UTF") || strstr(l, "utf")) |
44 | return CS_UTF8; |
45 | if ((p = strstr(l, "8859-"))) { |
46 | char buf[16]; |
47 | int charset; |
48 | |
49 | memcpy(buf, "ISO-8859-\0\0", 12); |
50 | p += 5; |
51 | if ((*p) >= '0' && (*p) <= '9') { |
52 | buf[9] = *p++; |
53 | if ((*p) >= '0' && (*p) <= '9') buf[10] = *p++; |
54 | if ((charset = charset_from_localenc(buf)) != CS_NONE) |
55 | return charset; |
56 | } |
57 | } |
58 | if (strstr(l, "KOI8-RU")) return CS_KOI8_RU; |
59 | if (strstr(l, "KOI8-R")) return CS_KOI8_R; |
60 | if (strstr(l, "KOI8-U")) return CS_KOI8_U; |
61 | /* if (strstr(l, "620")) return "TIS-620"; */ |
62 | if (strstr(l, "2312")) return CS_EUC_CN; |
63 | /* if (strstr(l, "HKSCS")) return "Big5HKSCS"; */ |
64 | if (strstr(l, "Big5") || strstr(l, "BIG5")) return CS_BIG5; |
65 | /* if (strstr(l, "GBK")) return "GBK"; */ |
66 | /* if (strstr(l, "18030")) return "GB18030"; */ |
67 | if (strstr(l, "Shift_JIS") || strstr(l, "SJIS")) return CS_SHIFT_JIS; |
68 | /* check for conclusive modifier */ |
69 | if (strstr(l, "euro")) return CS_ISO8859_15; |
70 | /* check for language (and perhaps country) codes */ |
71 | if (strstr(l, "zh_TW")) return CS_BIG5; |
72 | /* if (strstr(l, "zh_HK")) return "Big5HKSCS"; */ |
73 | if (strstr(l, "zh")) return CS_EUC_CN; |
74 | if (strstr(l, "ja")) return CS_EUC_JP; |
75 | if (strstr(l, "ko")) return CS_EUC_KR; |
76 | if (strstr(l, "ru")) return CS_KOI8_R; |
77 | if (strstr(l, "uk")) return CS_KOI8_U; |
78 | if (strstr(l, "pl") || strstr(l, "hr") || |
79 | strstr(l, "hu") || strstr(l, "cs") || |
80 | strstr(l, "sk") || strstr(l, "sl")) return CS_ISO8859_2; |
81 | if (strstr(l, "eo") || strstr(l, "mt")) return CS_ISO8859_3; |
82 | if (strstr(l, "el")) return CS_ISO8859_7; |
83 | if (strstr(l, "he")) return CS_ISO8859_8; |
84 | if (strstr(l, "tr")) return CS_ISO8859_9; |
85 | /* if (strstr(l, "th")) return "TIS-620"; */ |
86 | if (strstr(l, "lt")) return CS_ISO8859_13; |
87 | if (strstr(l, "cy")) return CS_ISO8859_14; |
88 | if (strstr(l, "ro")) return CS_ISO8859_2; /* or ISO-8859-16 */ |
89 | if (strstr(l, "am") || strstr(l, "vi")) return CS_UTF8; |
90 | return CS_ISO8859_1; |
91 | } |
92 | return CS_ASCII; |
93 | } |