1*40ef9009SDavid du Colombier /*
2*40ef9009SDavid du Colombier * The authors of this software are Rob Pike and Ken Thompson.
3*40ef9009SDavid du Colombier * Copyright (c) 2002 by Lucent Technologies.
4*40ef9009SDavid du Colombier * Permission to use, copy, modify, and distribute this software for any
5*40ef9009SDavid du Colombier * purpose without fee is hereby granted, provided that this entire notice
6*40ef9009SDavid du Colombier * is included in all copies of any software which is or includes a copy
7*40ef9009SDavid du Colombier * or modification of this software and in all copies of the supporting
8*40ef9009SDavid du Colombier * documentation for such software.
9*40ef9009SDavid du Colombier * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
10*40ef9009SDavid du Colombier * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
11*40ef9009SDavid du Colombier * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12*40ef9009SDavid du Colombier * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13*40ef9009SDavid du Colombier */
14*40ef9009SDavid du Colombier #include <stdarg.h>
15*40ef9009SDavid du Colombier #include <string.h>
16*40ef9009SDavid du Colombier #include "utf.h"
17*40ef9009SDavid du Colombier #include "utfdef.h"
18*40ef9009SDavid du Colombier
19*40ef9009SDavid du Colombier /*
20*40ef9009SDavid du Colombier * Return pointer to first occurrence of s2 in s1,
21*40ef9009SDavid du Colombier * 0 if none
22*40ef9009SDavid du Colombier */
23*40ef9009SDavid du Colombier Rune*
runestrstr(Rune * s1,Rune * s2)24*40ef9009SDavid du Colombier runestrstr(Rune *s1, Rune *s2)
25*40ef9009SDavid du Colombier {
26*40ef9009SDavid du Colombier Rune *p, *pa, *pb;
27*40ef9009SDavid du Colombier int c0, c;
28*40ef9009SDavid du Colombier
29*40ef9009SDavid du Colombier c0 = *s2;
30*40ef9009SDavid du Colombier if(c0 == 0)
31*40ef9009SDavid du Colombier return s1;
32*40ef9009SDavid du Colombier s2++;
33*40ef9009SDavid du Colombier for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) {
34*40ef9009SDavid du Colombier pa = p;
35*40ef9009SDavid du Colombier for(pb=s2;; pb++) {
36*40ef9009SDavid du Colombier c = *pb;
37*40ef9009SDavid du Colombier if(c == 0)
38*40ef9009SDavid du Colombier return p;
39*40ef9009SDavid du Colombier if(c != *++pa)
40*40ef9009SDavid du Colombier break;
41*40ef9009SDavid du Colombier }
42*40ef9009SDavid du Colombier }
43*40ef9009SDavid du Colombier return 0;
44*40ef9009SDavid du Colombier }
45