2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2005, 2007, 2008, 2013 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 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU 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, see <http://www.gnu.org/licenses/>.
18 /** @file lib/charset.c @brief Character set conversion */
27 # include <langinfo.h>
33 #include "configuration.h"
38 // TODO WIN32 we assume UTF-8 here, which is *definitely wrong*
39 char *mb2utf8(const char *mb) {
43 char *utf82mb(const char *utf8) {
48 /** @brief Low-level converstion routine
49 * @param from Source encoding
50 * @param to Destination encoding
51 * @param ptr First byte to convert
52 * @param n Number of bytes to convert
53 * @return Converted text, 0-terminated; or NULL on error.
55 static void *convert(const char *from, const char *to,
56 const void *ptr, size_t n) {
59 char *buf = 0, *s, *d;
60 size_t bufsize = 0, sl, dl;
62 if((i = iconv_open(to, from)) == (iconv_t)-1)
63 disorder_fatal(errno, "error calling iconv_open");
65 bufsize = bufsize ? 2 * bufsize : 32;
66 buf = xrealloc_noptr(buf, bufsize);
72 /* (void *) to work around FreeBSD's nonstandard iconv prototype */
73 len = iconv(i, (void *)&s, &sl, &d, &dl);
74 } while(len == (size_t)-1 && errno == E2BIG);
76 if(len == (size_t)-1) {
77 disorder_error(errno, "error converting from %s to %s", from, to);
83 /** @brief Convert from the local multibyte encoding to UTF-8
84 * @param mb String in current locale's multibyte encoding
85 * @return Same string in UTF-8
87 char *mb2utf8(const char *mb) {
88 return convert(nl_langinfo(CODESET), "UTF-8", mb, strlen(mb) + 1);
91 /** @brief Convert from UTF-8 to the local multibyte encoding
92 * @param utf8 String in UTF-8
93 * @return Same string in current locale's multibyte encoding
95 char *utf82mb(const char *utf8) {
96 return convert("UTF-8", nl_langinfo(CODESET), utf8, strlen(utf8) + 1);
99 /** @brief Convert from encoding @p from to UTF-8
100 * @param from Source encoding
101 * @param any String in encoding @p from
102 * @return @p any converted to UTF-8
104 char *any2utf8(const char *from, const char *any) {
105 return convert(from, "UTF-8", any, strlen(any) + 1);
108 /** @brief Convert from encoding @p from to the local multibyte encoding
109 * @param from Source encoding
110 * @param any String in encoding @p from
111 * @return @p any converted to current locale's multibyte encoding
113 char *any2mb(const char *from, const char *any) {
114 if(from) return convert(from, nl_langinfo(CODESET), any, strlen(any) + 1);
115 else return xstrdup(any);
118 /** @brief Convert from encoding @p from to encoding @p to
119 * @param from Source encoding
120 * @param to Destination encoding
121 * @param any String in encoding @p from
122 * @return @p any converted to encoding @p to
124 char *any2any(const char *from,
127 if(from || to) return convert(from, to, any, strlen(any) + 1);
128 else return xstrdup(any);
133 /** @brief Truncate a string for display purposes
134 * @param s Pointer to UTF-8 string
135 * @param max Maximum number of columns
136 * @return @p or truncated string (never NULL)
138 * Returns a string that is no longer than @p max graphemes long and is either
139 * (canonically) equal to @p s or is a truncated form of it with an ellipsis
142 * We don't take display width into account (tricky for HTML!) and we don't
143 * attempt to implement the Bidi algorithm. If you have track names for which
144 * either of these matter in practice then get in touch.
146 const char *truncate_for_display(const char *s, long max) {
152 /* Convert to UTF-32 for processing */
153 if(!(s32 = utf8_to_utf32(s, strlen(s), &l32)))
155 it = utf32_iterator_new(s32, l32);
157 graphemes = 0; /* # of graphemes left of it */
158 while(graphemes <= max && utf32_iterator_where(it) < l32) {
159 if(graphemes == max - 1)
160 cut = utf32_iterator_where(it);
161 utf32_iterator_advance(it, 1);
162 if(utf32_iterator_grapheme_boundary(it))
165 if(graphemes > max) { /* we need to cut */
166 s32[cut] = 0x2026; /* HORIZONTAL ELLIPSIS */
168 s = utf32_to_utf8(s32, l32, 0);