conterm/libc/utfutf.c

27 lines
391 B
C

#include <u.h>
#include <libc.h>
/*
* Return pointer to first occurrence of s2 in s1,
* 0 if none
*/
char*
utfutf(char *s1, char *s2)
{
char *p;
long f, n1, n2;
Rune r;
n1 = chartorune(&r, s2);
f = r;
if(f <= Runesync) /* represents self */
return strstr(s1, s2);
n2 = strlen(s2);
for(p=s1; (p=utfrune(p, f)); p+=n1)
if(strncmp(p, s2, n2) == 0)
return p;
return 0;
}