ref: b7ee84c65da44dfed3d8ceca424da511b0c1412f
dir: /sys/src/libc/port/utfutf.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; }