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comparison mcabber/src/utf8.c @ 930:a75f7a13df7b

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UTF-8 terminal support (Reimar Döffinger) This is a patch from Reimar Döffinger, slightly modified, which makes mcabber work better on UTF-8 terminals.
author Mikael Berthe <mikael@lilotux.net>
date Sat, 08 Jul 2006 09:40:05 +0200
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929:f4bf564893b5 930:a75f7a13df7b
1 /*
2 * utf8.c -- UTF-8 routines
3 *
4 * Copyright (C) 2006 Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 * USA
20 */
21
22 #include "utf8.h"
23
24 char *prev_char(char *str, const char *limit)
25 {
26 if (str <= limit)
27 return str;
28 str--;
29 if (utf8_mode)
30 while ((str > limit) && ((*str & 0xc0) == 0x80))
31 str--;
32 return str;
33 }
34
35 char *next_char(char *str)
36 {
37 if (!*str)
38 return str;
39 str++;
40 if (utf8_mode)
41 while ((*str & 0xc0) == 0x80)
42 str++;
43 return str;
44 }
45
46 unsigned get_char(const char *str)
47 {
48 unsigned char *strp = (unsigned char *)str;
49 unsigned c = *strp++;
50 unsigned mask = 0x80;
51 int len = -1;
52 if (!utf8_mode)
53 return c;
54 while (c & mask) {
55 mask >>= 1;
56 len++;
57 }
58 if (len <= 0 || len > 4)
59 goto no_utf8;
60 c &= mask - 1;
61 while ((*strp & 0xc0) == 0x80) {
62 if (len-- <= 0)
63 goto no_utf8;
64 c = (c << 6) | (*strp++ & 0x3f);
65 }
66 if (len)
67 goto no_utf8;
68 return c;
69
70 no_utf8:
71 return *str;
72 }
73
74 char *put_char(char *str, unsigned c)
75 {
76 int mask = 0xffffffc0;
77 int i = 4;
78 char code[5];
79 if (!utf8_mode || c < 128) {
80 *str++ = c;
81 return str;
82 }
83 while (c & mask) {
84 code[i--] = 0x80 | (c & 0x3f);
85 c >>= 6;
86 mask >>= 1;
87 if (i < 0) {
88 *str++ = '?';
89 return str;
90 }
91 }
92 code[i] = (mask << 1) | c;
93 for (; i < 5; i++)
94 *str++ = code[i];
95 return str;
96 }
97
98 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */