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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/* Determine a canonical name for the current locale's character encoding.
Copyright (C) 2000 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA. */
/* Written by Bruno Haible <haible@clisp.cons.org>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_LANGINFO_CODESET
# include <langinfo.h>
#else
# if HAVE_SETLOCALE
# include <locale.h>
# endif
#endif
char *xmalloc ();
char *xrealloc ();
/* Pointer to the contents of the charset.alias file, if it has already been
read, else NULL. Its format is:
ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */
static char * volatile charset_aliases;
/* Return a pointer to the contents of the charset.alias file. */
static const char *
get_charset_aliases ()
{
char *cp;
cp = charset_aliases;
if (cp == NULL)
{
FILE *fp;
fp = fopen (LIBDIR "/" "charset.alias", "r");
if (fp == NULL)
/* File not found, treat it as empty. */
cp = "";
else
{
/* Parse the file's contents. */
int c;
char buf1[50+1];
char buf2[50+1];
char *res_ptr = NULL;
size_t res_size = 0;
size_t l1, l2;
for (;;)
{
c = getc (fp);
if (c == EOF)
break;
if (c == '\n' || c == ' ' || c == '\t')
continue;
if (c == '#')
{
/* Skip comment, to end of line. */
do
c = getc (fp);
while (!(c == EOF || c == '\n'));
if (c == EOF)
break;
continue;
}
ungetc (c, fp);
if (fscanf(fp, "%50s %50s", buf1, buf2) < 2)
break;
l1 = strlen (buf1);
l2 = strlen (buf2);
if (res_size == 0)
{
res_size = l1 + 1 + l2 + 1;
res_ptr = xmalloc (res_size + 1);
}
else
{
res_size += l1 + 1 + l2 + 1;
res_ptr = xrealloc (res_ptr, res_size + 1);
}
strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
strcpy (res_ptr + res_size - (l2 + 1), buf2);
}
fclose (fp);
if (res_size == 0)
cp = "";
else
{
*(res_ptr + res_size) = '\0';
cp = res_ptr;
}
}
charset_aliases = cp;
}
return cp;
}
/* Determine the current locale's character encoding, and canonicalize it
into one of the canonical names listed in config.charset.
The result must not be freed; it is statically allocated.
If the canonical name cannot be determined, the result is a non-canonical
name or NULL. */
#ifdef STATIC
STATIC
#endif
const char *
locale_charset ()
{
const char *codeset;
const char *aliases;
#if HAVE_LANGINFO_CODESET
/* Most systems support nl_langinfo (CODESET) nowadays. */
codeset = nl_langinfo (CODESET);
#else
/* On old systems which lack it, use setlocale and getenv. */
const char *locale = NULL;
# if HAVE_SETLOCALE
locale = setlocale (LC_CTYPE, NULL);
# endif
if (locale == NULL)
{
locale = getenv ("LC_ALL");
if (locale == NULL)
{
locale = getenv ("LC_CTYPE");
if (locale == NULL)
locale = getenv ("LANG");
}
}
/* On some old systems, one used to set locale = "iso8859_1". On others,
you set it to "language_COUNTRY.charset". In any case, we resolve it
through the charset.alias file. */
codeset = locale;
#endif
if (codeset != NULL)
{
/* Resolve alias. */
for (aliases = get_charset_aliases ();
*aliases != '\0';
aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
if (!strcmp (codeset, aliases))
{
codeset = aliases + strlen (aliases) + 1;
break;
}
}
return codeset;
}
|
