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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2004, 2005 Richard Kettlewell | |
4 | * | |
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. | |
9 | * | |
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. | |
14 | * | |
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 | |
18 | * USA | |
19 | */ | |
14ad73b9 | 20 | /** @file lib/charset.c @brief Character set conversion */ |
460b9539 | 21 | |
22 | #include <config.h> | |
23 | #include "types.h" | |
24 | ||
25 | #include <iconv.h> | |
26 | #include <string.h> | |
27 | #include <errno.h> | |
28 | #include <langinfo.h> | |
29 | ||
30 | #include "mem.h" | |
31 | #include "log.h" | |
32 | #include "charset.h" | |
33 | #include "configuration.h" | |
460b9539 | 34 | #include "vector.h" |
11f598d1 | 35 | #include "unicode.h" |
460b9539 | 36 | |
14ad73b9 RK |
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. | |
43 | */ | |
460b9539 | 44 | static void *convert(const char *from, const char *to, |
45 | const void *ptr, size_t n) { | |
46 | iconv_t i; | |
47 | size_t len; | |
48 | char *buf = 0, *s, *d; | |
49 | size_t bufsize = 0, sl, dl; | |
50 | ||
51 | if((i = iconv_open(to, from)) == (iconv_t)-1) | |
52 | fatal(errno, "error calling iconv_open"); | |
53 | do { | |
54 | bufsize = bufsize ? 2 * bufsize : 32; | |
55 | buf = xrealloc_noptr(buf, bufsize); | |
56 | iconv(i, 0, 0, 0, 0); | |
57 | s = (char *)ptr; | |
58 | sl = n; | |
59 | d = buf; | |
60 | dl = 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); | |
64 | iconv_close(i); | |
65 | if(len == (size_t)-1) { | |
66 | error(errno, "error converting from %s to %s", from, to); | |
67 | return 0; | |
68 | } | |
69 | return buf; | |
70 | } | |
71 | ||
14ad73b9 | 72 | /** @brief Convert from the local multibyte encoding to UTF-8 */ |
460b9539 | 73 | char *mb2utf8(const char *mb) { |
74 | return convert(nl_langinfo(CODESET), "UTF-8", mb, strlen(mb) + 1); | |
75 | } | |
76 | ||
14ad73b9 | 77 | /** @brief Convert from UTF-8 to the local multibyte encoding */ |
460b9539 | 78 | char *utf82mb(const char *utf8) { |
79 | return convert("UTF-8", nl_langinfo(CODESET), utf8, strlen(utf8) + 1); | |
80 | } | |
81 | ||
14ad73b9 | 82 | /** @brief Convert from encoding @p from to UTF-8 */ |
460b9539 | 83 | char *any2utf8(const char *from, const char *any) { |
84 | return convert(from, "UTF-8", any, strlen(any) + 1); | |
85 | } | |
86 | ||
14ad73b9 | 87 | /** @brief Convert from encoding @p from to the local multibyte encoding */ |
460b9539 | 88 | char *any2mb(const char *from, const char *any) { |
89 | if(from) return convert(from, nl_langinfo(CODESET), any, strlen(any) + 1); | |
90 | else return xstrdup(any); | |
91 | } | |
92 | ||
14ad73b9 | 93 | /** @brief Convert from encoding @p from to encoding @p to */ |
460b9539 | 94 | char *any2any(const char *from, |
95 | const char *to, | |
96 | const char *any) { | |
97 | if(from || to) return convert(from, to, any, strlen(any) + 1); | |
98 | else return xstrdup(any); | |
99 | } | |
100 | ||
61507e3c RK |
101 | /** @brief Truncate a string for display purposes |
102 | * @param s Pointer to UTF-8 string | |
103 | * @param max Maximum number of columns | |
104 | * @return @p or truncated string (never NULL) | |
105 | * | |
11f598d1 RK |
106 | * Returns a string that is no longer than @p max graphemes long and is either |
107 | * (canonically) equal to @p s or is a truncated form of it with an ellipsis | |
108 | * appended. | |
109 | * | |
110 | * We don't take display width into account (tricky for HTML!) and we don't | |
111 | * attempt to implement the Bidi algorithm. If you have track names for which | |
112 | * either of these matter in practice then get in touch. | |
61507e3c RK |
113 | */ |
114 | const char *truncate_for_display(const char *s, long max) { | |
11f598d1 RK |
115 | uint32_t *s32; |
116 | size_t l32, cut; | |
117 | utf32_iterator it; | |
61507e3c | 118 | |
11f598d1 RK |
119 | /* Convert to UTF-32 for processing */ |
120 | if(!(s32 = utf8_to_utf32(s, strlen(s), &l32))) | |
121 | return 0; | |
122 | it = utf32_iterator_new(s32, l32); | |
123 | cut = l32; | |
124 | while(max && utf32_iterator_where(it) < l32) { | |
125 | utf32_iterator_advance(it, 1); | |
126 | if(utf32_iterator_grapheme_boundary(it)) | |
127 | --max; | |
128 | if(max == 1) | |
129 | cut = utf32_iterator_where(it); | |
130 | } | |
131 | if(max == 0) { /* we need to cut */ | |
132 | s32[cut] = 0x2026; /* HORIZONTAL ELLIPSIS */ | |
133 | l32 = cut + 1; | |
134 | s = utf32_to_utf8(s32, l32, 0); | |
61507e3c | 135 | } |
11f598d1 RK |
136 | xfree(s32); |
137 | return s; | |
61507e3c RK |
138 | } |
139 | ||
460b9539 | 140 | /* |
141 | Local Variables: | |
142 | c-basic-offset:2 | |
143 | comment-column:40 | |
11f598d1 RK |
144 | fill-column:79 |
145 | indent-tabs-mode:nil | |
460b9539 | 146 | End: |
147 | */ |