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- #include <u.h>
- #include <libc.h>
- /*
- * Return pointer to first occurrence of s2 in s1,
- * 0 if none
- */
- Rune*
- runestrstr(Rune *s1, Rune *s2)
- {
- Rune *p, *pa, *pb;
- int c0, c;
- c0 = *s2;
- if(c0 == 0)
- return s1;
- s2++;
- for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) {
- pa = p;
- for(pb=s2;; pb++) {
- c = *pb;
- if(c == 0)
- return p;
- if(c != *++pa)
- break;
- }
- }
- return 0;
- }
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