Code

61d7dac70dbcbb3ef4774b34c2c0189a8a914c29
[ncmpc.git] / src / charset.c
1 /* ncmpc (Ncurses MPD Client)
2  * (c) 2004-2010 The Music Player Daemon Project
3  * Project homepage: http://musicpd.org
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,
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  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
20 #include "charset.h"
22 #include <assert.h>
23 #include <string.h>
24 #include <glib.h>
26 #ifdef ENABLE_LOCALE
27 static bool noconvert = true;
28 static const char *charset;
30 const char *
31 charset_init(void)
32 {
33         noconvert = g_get_charset(&charset);
34         return charset;
35 }
36 #endif
38 #ifdef HAVE_CURSES_ENHANCED
39 static inline unsigned
40 unicode_char_width(gunichar ch)
41 {
42         if (g_unichar_iszerowidth(ch))
43                 return 0;
45         if (g_unichar_iswide(ch))
46                 return 2;
48         return 1;
49 }
50 #endif /* HAVE_CURSES_ENHANCED */
52 unsigned
53 utf8_width(const char *str)
54 {
55         assert(str != NULL);
57 #if defined(ENABLE_MULTIBYTE) && !defined(HAVE_CURSES_ENHANCED)
58         return g_utf8_strlen(str, -1);
59 #else
60 #ifdef HAVE_CURSES_ENHANCED
61         if (g_utf8_validate(str, -1, NULL)) {
62                 size_t len = g_utf8_strlen(str, -1);
63                 unsigned width = 0;
64                 gunichar c;
66                 while (len--) {
67                         c = g_utf8_get_char(str);
68                         width += unicode_char_width(c);
69                         str += g_unichar_to_utf8(c, NULL);
70                 }
72                 return width;
73         } else
74 #endif
75                 return strlen(str);
76 #endif
77 }
79 unsigned
80 locale_width(const char *p)
81 {
82 #if defined(ENABLE_LOCALE) && defined(ENABLE_MULTIBYTE)
83         char *utf8;
84         unsigned width;
86         if (noconvert)
87                 return utf8_width(p);
89         utf8 = locale_to_utf8(p);
90         width = utf8_width(utf8);
91         g_free(utf8);
93         return width;
94 #else
95         return strlen(p);
96 #endif
97 }
99 static inline unsigned
100 ascii_cut_width(char *p, unsigned max_width)
102         size_t length = strlen(p);
103         if (length <= (size_t)max_width)
104                 return (unsigned)length;
106         p[max_width] = 0;
107         return max_width;
110 static inline unsigned
111 narrow_cut_width(char *p, unsigned max_width)
113         size_t length = g_utf8_strlen(p, -1);
114         if (length <= (size_t)max_width)
115                 return (unsigned)length;
117         *g_utf8_offset_to_pointer(p, max_width) = 0;
118         return max_width;
121 static inline unsigned
122 wide_cut_width(char *p, unsigned max_width)
124         size_t length = g_utf8_strlen(p, -1);
125         unsigned width = 0, prev_width;
127         while (length-- > 0) {
128                 gunichar c = g_utf8_get_char(p);
129                 prev_width = width;
130                 width += g_unichar_iswide(c) ? 2 : 1;
131                 if (width > max_width) {
132                         /* too wide - cut the rest off */
133                         *p = 0;
134                         return prev_width;
135                 }
137                 p += g_unichar_to_utf8(c, NULL);
138         }
140         return width;
143 unsigned
144 utf8_cut_width(char *p, unsigned max_width)
146         assert(p != NULL);
148 #ifdef HAVE_CURSES_ENHANCED
149         if (!g_utf8_validate(p, -1, NULL))
150                 return ascii_cut_width(p, max_width);
152         return wide_cut_width(p, max_width);
153 #elif defined(ENABLE_MULTIBYTE) && !defined(HAVE_CURSES_ENHANCED)
154         return narrow_cut_width(p, max_width);
155 #else
156         return ascii_cut_width(p, max_width);
157 #endif
160 char *
161 utf8_to_locale(const char *utf8str)
163 #ifdef ENABLE_LOCALE
164         assert(utf8str != NULL);
166         if (noconvert)
167                 return g_strdup(utf8str);
169         gchar *str = g_convert_with_fallback(utf8str, -1,
170                                              charset, "utf-8",
171                                              NULL, NULL, NULL, NULL);
172         if (str == NULL)
173                 return g_strdup(utf8str);
175         return str;
176 #else
177         return g_strdup(utf8str);
178 #endif
181 char *
182 locale_to_utf8(const char *localestr)
184 #ifdef ENABLE_LOCALE
185         assert(localestr != NULL);
187         if (noconvert)
188                 return g_strdup(localestr);
190         gchar *str = g_convert_with_fallback(localestr, -1,
191                                              "utf-8", charset,
192                                              NULL, NULL, NULL, NULL);
193         if (str == NULL)
194                 return g_strdup(localestr);
196         return str;
197 #else
198         return g_strdup(localestr);
199 #endif
202 char *
203 replace_utf8_to_locale(char *src)
205 #ifdef ENABLE_LOCALE
206         assert(src != NULL);
208         if (noconvert)
209                 return src;
211         return utf8_to_locale(src);
212 #else
213         return src;
214 #endif
218 char *
219 replace_locale_to_utf8(char *src)
221 #ifdef ENABLE_LOCALE
222         assert(src != NULL);
224         if (noconvert)
225                 return src;
227         return locale_to_utf8(src);
228 #else
229         return src;
230 #endif