1 #include <plan9.h> 2 3 char* utfrune(char * s,long c)4utfrune(char *s, long c) 5 { 6 long c1; 7 Rune r; 8 int n; 9 10 if(c < Runesync) /* not part of utf sequence */ 11 return strchr(s, c); 12 13 for(;;) { 14 c1 = *(uchar*)s; 15 if(c1 < Runeself) { /* one byte rune */ 16 if(c1 == 0) 17 return 0; 18 if(c1 == c) 19 return s; 20 s++; 21 continue; 22 } 23 n = chartorune(&r, s); 24 if(r == c) 25 return s; 26 s += n; 27 } 28 return 0; 29 } 30