2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2005 Richard Kettlewell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 /** @file lib/charset.c @brief Character set conversion */
33 #include "configuration.h"
37 /** @brief Low-level converstion routine
38 * @param from Source encoding
39 * @param to Destination encoding
40 * @param ptr First byte to convert
41 * @param n Number of bytes to convert
42 * @return Converted text, 0-terminated; or NULL on error.
44 static void *convert(const char *from
, const char *to
,
45 const void *ptr
, size_t n
) {
48 char *buf
= 0, *s
, *d
;
49 size_t bufsize
= 0, sl
, dl
;
51 if((i
= iconv_open(to
, from
)) == (iconv_t
)-1)
52 fatal(errno
, "error calling iconv_open");
54 bufsize
= bufsize ?
2 * bufsize
: 32;
55 buf
= xrealloc_noptr(buf
, bufsize
);
61 /* (void *) to work around FreeBSD's nonstandard iconv prototype */
62 len
= iconv(i
, (void *)&s
, &sl
, &d
, &dl
);
63 } while(len
== (size_t)-1 && errno
== E2BIG
);
65 if(len
== (size_t)-1) {
66 error(errno
, "error converting from %s to %s", from
, to
);
72 /** @brief Convert UTF-8 to UCS-4
73 * @param mb Pointer to 0-terminated UTF-8 string
74 * @return Pointer to 0-terminated UCS-4 string
76 * Not everybody's iconv supports UCS-4, and it's inconvenient to have to know
77 * our endianness, and it's easy to convert it ourselves, so we do. See also
80 uint32_t *utf82ucs4(const char *mb
) {
87 error(0, "invalid UTF-8 sequence"); return 0;);
88 dynstr_ucs4_append(&d
, c
);
90 dynstr_ucs4_terminate(&d
);
94 /** @brief Convert UCS-4 to UTF-8
95 * @param u Pointer to 0-terminated UCS-4 string
96 * @return Pointer to 0-terminated UTF-8 string
98 * See @ref utf82ucs4().
100 char *ucs42utf8(const uint32_t *u
) {
107 dynstr_append(&d
, c
);
109 dynstr_append(&d
, 0xC0 | (c
>> 6));
110 dynstr_append(&d
, 0x80 | (c
& 0x3F));
111 } else if(c
< 0x10000) {
112 dynstr_append(&d
, 0xE0 | (c
>> 12));
113 dynstr_append(&d
, 0x80 | ((c
>> 6) & 0x3F));
114 dynstr_append(&d
, 0x80 | (c
& 0x3F));
115 } else if(c
< 0x110000) {
116 dynstr_append(&d
, 0xF0 | (c
>> 18));
117 dynstr_append(&d
, 0x80 | ((c
>> 12) & 0x3F));
118 dynstr_append(&d
, 0x80 | ((c
>> 6) & 0x3F));
119 dynstr_append(&d
, 0x80 | (c
& 0x3F));
121 error(0, "invalid UCS-4 character");
125 dynstr_terminate(&d
);
129 /** @brief Convert from the local multibyte encoding to UTF-8 */
130 char *mb2utf8(const char *mb
) {
131 return convert(nl_langinfo(CODESET
), "UTF-8", mb
, strlen(mb
) + 1);
134 /** @brief Convert from UTF-8 to the local multibyte encoding */
135 char *utf82mb(const char *utf8
) {
136 return convert("UTF-8", nl_langinfo(CODESET
), utf8
, strlen(utf8
) + 1);
139 /** @brief Convert from encoding @p from to UTF-8 */
140 char *any2utf8(const char *from
, const char *any
) {
141 return convert(from
, "UTF-8", any
, strlen(any
) + 1);
144 /** @brief Convert from encoding @p from to the local multibyte encoding */
145 char *any2mb(const char *from
, const char *any
) {
146 if(from
) return convert(from
, nl_langinfo(CODESET
), any
, strlen(any
) + 1);
147 else return xstrdup(any
);
150 /** @brief Convert from encoding @p from to encoding @p to */
151 char *any2any(const char *from
,
154 if(from
|| to
) return convert(from
, to
, any
, strlen(any
) + 1);
155 else return xstrdup(any
);
158 /** @brief strlen workalike for UCS-4 strings
160 * We don't rely on the local @c wchar_t being UCS-4.
162 int ucs4cmp(const uint32_t *a
, const uint32_t *b
) {
163 while(*a
&& *b
&& *a
== *b
) ++a
, ++b
;
164 if(*a
> *b
) return 1;
165 else if(*a
< *b
) return -1;