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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
cca89d7c | 3 | * Copyright (C) 2004, 2005, 2007, 2008, 2013 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
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. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
14ad73b9 | 18 | /** @file lib/charset.c @brief Character set conversion */ |
460b9539 | 19 | |
05b75f8d | 20 | #include "common.h" |
460b9539 | 21 | |
cca89d7c RK |
22 | #if HAVE_ICONV_H |
23 | # include <iconv.h> | |
24 | #endif | |
460b9539 | 25 | #include <errno.h> |
cca89d7c RK |
26 | #if HAVE_LANGINFO_H |
27 | # include <langinfo.h> | |
28 | #endif | |
460b9539 | 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 | |
9e42afcd RK |
37 | #if _WIN32 |
38 | // TODO WIN32 we assume UTF-8 here, which is *definitely wrong* | |
39 | char *mb2utf8(const char *mb) { | |
40 | return xstrdup(mb); | |
41 | } | |
42 | ||
43 | char *utf82mb(const char *utf8) { | |
44 | return xstrdup(utf8); | |
45 | } | |
46 | #else | |
47 | ||
14ad73b9 RK |
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. | |
54 | */ | |
460b9539 | 55 | static void *convert(const char *from, const char *to, |
56 | const void *ptr, size_t n) { | |
57 | iconv_t i; | |
58 | size_t len; | |
59 | char *buf = 0, *s, *d; | |
60 | size_t bufsize = 0, sl, dl; | |
61 | ||
62 | if((i = iconv_open(to, from)) == (iconv_t)-1) | |
2e9ba080 | 63 | disorder_fatal(errno, "error calling iconv_open"); |
460b9539 | 64 | do { |
65 | bufsize = bufsize ? 2 * bufsize : 32; | |
66 | buf = xrealloc_noptr(buf, bufsize); | |
67 | iconv(i, 0, 0, 0, 0); | |
68 | s = (char *)ptr; | |
69 | sl = n; | |
70 | d = buf; | |
71 | dl = 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); | |
75 | iconv_close(i); | |
76 | if(len == (size_t)-1) { | |
2e9ba080 | 77 | disorder_error(errno, "error converting from %s to %s", from, to); |
460b9539 | 78 | return 0; |
79 | } | |
80 | return buf; | |
81 | } | |
82 | ||
34d37b3e RK |
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 | |
86 | */ | |
460b9539 | 87 | char *mb2utf8(const char *mb) { |
88 | return convert(nl_langinfo(CODESET), "UTF-8", mb, strlen(mb) + 1); | |
89 | } | |
90 | ||
34d37b3e RK |
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 | |
94 | */ | |
460b9539 | 95 | char *utf82mb(const char *utf8) { |
96 | return convert("UTF-8", nl_langinfo(CODESET), utf8, strlen(utf8) + 1); | |
97 | } | |
98 | ||
34d37b3e RK |
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 | |
103 | */ | |
460b9539 | 104 | char *any2utf8(const char *from, const char *any) { |
105 | return convert(from, "UTF-8", any, strlen(any) + 1); | |
106 | } | |
107 | ||
34d37b3e RK |
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 | |
112 | */ | |
460b9539 | 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); | |
116 | } | |
117 | ||
34d37b3e RK |
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 | |
123 | */ | |
460b9539 | 124 | char *any2any(const char *from, |
125 | const char *to, | |
126 | const char *any) { | |
127 | if(from || to) return convert(from, to, any, strlen(any) + 1); | |
128 | else return xstrdup(any); | |
129 | } | |
130 | ||
9e42afcd RK |
131 | #endif |
132 | ||
61507e3c RK |
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) | |
137 | * | |
11f598d1 RK |
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 | |
140 | * appended. | |
141 | * | |
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. | |
61507e3c RK |
145 | */ |
146 | const char *truncate_for_display(const char *s, long max) { | |
11f598d1 RK |
147 | uint32_t *s32; |
148 | size_t l32, cut; | |
149 | utf32_iterator it; | |
baee3e3a | 150 | long graphemes; |
61507e3c | 151 | |
11f598d1 RK |
152 | /* Convert to UTF-32 for processing */ |
153 | if(!(s32 = utf8_to_utf32(s, strlen(s), &l32))) | |
154 | return 0; | |
155 | it = utf32_iterator_new(s32, l32); | |
156 | cut = l32; | |
baee3e3a RK |
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); | |
11f598d1 RK |
161 | utf32_iterator_advance(it, 1); |
162 | if(utf32_iterator_grapheme_boundary(it)) | |
baee3e3a | 163 | ++graphemes; |
11f598d1 | 164 | } |
baee3e3a | 165 | if(graphemes > max) { /* we need to cut */ |
11f598d1 RK |
166 | s32[cut] = 0x2026; /* HORIZONTAL ELLIPSIS */ |
167 | l32 = cut + 1; | |
168 | s = utf32_to_utf8(s32, l32, 0); | |
61507e3c | 169 | } |
11f598d1 RK |
170 | xfree(s32); |
171 | return s; | |
61507e3c RK |
172 | } |
173 | ||
460b9539 | 174 | /* |
175 | Local Variables: | |
176 | c-basic-offset:2 | |
177 | comment-column:40 | |
11f598d1 RK |
178 | fill-column:79 |
179 | indent-tabs-mode:nil | |
460b9539 | 180 | End: |
181 | */ |