summaryrefslogtreecommitdiff
path: root/localeinit.c
blob: cea2e309f50cd8cb7af909b69686cf81bf604346 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/**********************************************************************

  localeinit.c -

  $Author$
  created at: Thu Jul 11 22:09:57 JST 2013

  Copyright (C) 2013 Yukihiro Matsumoto

**********************************************************************/

#include "ruby/encoding.h"
#include "internal.h"
#include "encindex.h"
#ifdef __CYGWIN__
#include <windows.h>
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif

#if defined _WIN32 || defined __CYGWIN__
#define SIZEOF_CP_NAME ((sizeof(UINT) * 8 / 3) + 4)
#define CP_FORMAT(buf, codepage) snprintf(buf, sizeof(buf), "CP%u", (codepage))

extern UINT ruby_w32_codepage[2];
#endif

#ifndef NO_LOCALE_CHARMAP
# if defined _WIN32 || defined __CYGWIN__ || defined HAVE_LANGINFO_H
#   define NO_LOCALE_CHARMAP 0
# else
#   define NO_LOCALE_CHARMAP 1
# endif
#endif

#if !NO_LOCALE_CHARMAP
static VALUE
locale_charmap(VALUE (*conv)(const char *))
{
    const char *codeset = 0;
#if defined _WIN32 || defined __CYGWIN__
    char cp[SIZEOF_CP_NAME];
# ifdef __CYGWIN__
    const char *nl_langinfo_codeset(void);
    codeset = nl_langinfo_codeset();
# endif
    if (!codeset) {
        UINT codepage = ruby_w32_codepage[0];
        if (!codepage) codepage = GetConsoleCP();
        if (!codepage) codepage = GetACP();
        CP_FORMAT(cp, codepage);
        codeset = cp;
    }
#elif defined HAVE_LANGINFO_H
    codeset = nl_langinfo(CODESET);
    ASSUME(codeset);
#else
# error locale_charmap() is not implemented
#endif
    return (*conv)(codeset);
}
#endif

/*
 * call-seq:
 *   Encoding.locale_charmap -> string
 *
 * Returns the locale charmap name.
 * It returns nil if no appropriate information.
 *
 *   Debian GNU/Linux
 *     LANG=C
 *       Encoding.locale_charmap  #=> "ANSI_X3.4-1968"
 *     LANG=ja_JP.EUC-JP
 *       Encoding.locale_charmap  #=> "EUC-JP"
 *
 *   SunOS 5
 *     LANG=C
 *       Encoding.locale_charmap  #=> "646"
 *     LANG=ja
 *       Encoding.locale_charmap  #=> "eucJP"
 *
 * The result is highly platform dependent.
 * So Encoding.find(Encoding.locale_charmap) may cause an error.
 * If you need some encoding object even for unknown locale,
 * Encoding.find("locale") can be used.
 *
 */
VALUE
rb_locale_charmap(VALUE klass)
{
#if NO_LOCALE_CHARMAP
    return rb_usascii_str_new_cstr("US-ASCII");
#else
    return locale_charmap(rb_usascii_str_new_cstr);
#endif
}

#if !NO_LOCALE_CHARMAP
static VALUE
enc_find_index(const char *name)
{
    return (VALUE)rb_enc_find_index(name);
}
#endif

int
rb_locale_charmap_index(void)
{
#if NO_LOCALE_CHARMAP
    return ENCINDEX_US_ASCII;
#else
    return (int)locale_charmap(enc_find_index);
#endif
}

int
Init_enc_set_filesystem_encoding(void)
{
    int idx;
#if NO_LOCALE_CHARMAP
    idx = ENCINDEX_US_ASCII;
#elif defined _WIN32
    char cp[SIZEOF_CP_NAME];
    const UINT codepage = ruby_w32_codepage[1];
    if (!codepage) return ENCINDEX_UTF_8;
    /* for debugging */
    CP_FORMAT(cp, codepage);
    idx = rb_enc_find_index(cp);
    if (idx < 0) idx = ENCINDEX_ASCII_8BIT;
#elif defined __CYGWIN__
    idx = ENCINDEX_UTF_8;
#else
    idx = rb_enc_to_index(rb_default_external_encoding());
#endif
    return idx;
}