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- #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;
- }
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