utfrune.c - 9base - revived minimalist port of Plan 9 userland to Unix | |
git clone git://git.suckless.org/9base | |
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utfrune.c (1184B) | |
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1 /* | |
2 * The authors of this software are Rob Pike and Ken Thompson. | |
3 * Copyright (c) 2002 by Lucent Technologies. | |
4 * Permission to use, copy, modify, and distribute this software for any | |
5 * purpose without fee is hereby granted, provided that this entire noti… | |
6 * is included in all copies of any software which is or includes a copy | |
7 * or modification of this software and in all copies of the supporting | |
8 * documentation for such software. | |
9 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLI… | |
10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES… | |
11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABI… | |
12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. | |
13 */ | |
14 #include <stdarg.h> | |
15 #include <string.h> | |
16 #include "plan9.h" | |
17 #include "utf.h" | |
18 | |
19 char* | |
20 utfrune(char *s, long c) | |
21 { | |
22 long c1; | |
23 Rune r; | |
24 int n; | |
25 | |
26 if(c < Runesync) /* not part of utf sequence */ | |
27 return strchr(s, c); | |
28 | |
29 for(;;) { | |
30 c1 = *(uchar*)s; | |
31 if(c1 < Runeself) { /* one byte rune */ | |
32 if(c1 == 0) | |
33 return 0; | |
34 if(c1 == c) | |
35 return s; | |
36 s++; | |
37 continue; | |
38 } | |
39 n = chartorune(&r, s); | |
40 if(r == c) | |
41 return s; | |
42 s += n; | |
43 } | |
44 } |