conterm/libc/runestrstr.c

30 lines
397 B
C

#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;
}