utfnlen.c - 9base - revived minimalist port of Plan 9 userland to Unix | |
git clone git://git.suckless.org/9base | |
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utfnlen.c (1111B) | |
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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 int | |
20 utfnlen(char *s, long m) | |
21 { | |
22 int c; | |
23 long n; | |
24 Rune rune; | |
25 char *es; | |
26 | |
27 es = s + m; | |
28 for(n = 0; s < es; n++) { | |
29 c = *(uchar*)s; | |
30 if(c < Runeself){ | |
31 if(c == '\0') | |
32 break; | |
33 s++; | |
34 continue; | |
35 } | |
36 if(!fullrune(s, es-s)) | |
37 break; | |
38 s += chartorune(&rune, s); | |
39 } | |
40 return n; | |
41 } |