1 #include <u.h> 2 #include <libc.h> 3 4 char* utfrrune(char * s,long c)5utfrrune(char *s, long c) 6 { 7 long c1; 8 Rune r; 9 char *s1; 10 11 if(c < Runesync) /* not part of utf sequence */ 12 return strrchr(s, c); 13 14 s1 = 0; 15 for(;;) { 16 c1 = *(uchar*)s; 17 if(c1 < Runeself) { /* one byte rune */ 18 if(c1 == 0) 19 return s1; 20 if(c1 == c) 21 s1 = s; 22 s++; 23 continue; 24 } 25 c1 = chartorune(&r, s); 26 if(r == c) 27 s1 = s; 28 s += c1; 29 } 30 } 31