utfutf.c (1198B) download
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 notice
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 IMPLIED
10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13 */
14#include "utf.h"
15
16#include "plan9.h"
17
18#include <stdarg.h>
19#include <string.h>
20
21
22/*
23 * Return pointer to first occurrence of s2 in s1,
24 * 0 if none
25 */
26char* utfutf(char* s1, char* s2) {
27 char* p;
28 long f, n1, n2;
29 Rune r;
30
31 n1 = chartorune(&r, s2);
32 f = r;
33 if (f <= Runesync) /* represents self */
34 return strstr(s1, s2);
35
36 n2 = strlen(s2);
37 for (p = s1; (p = utfrune(p, f)); p += n1)
38 if (strncmp(p, s2, n2) == 0)
39 return p;
40 return 0;
41}