| /* |
| * The authors of this software are Rob Pike and Ken Thompson. |
| * Copyright (c) 2002 by Lucent Technologies. |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose without fee is hereby granted, provided that this entire notice |
| * is included in all copies of any software which is or includes a copy |
| * or modification of this software and in all copies of the supporting |
| * documentation for such software. |
| * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE |
| * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY |
| * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. |
| */ |
| #include <stdarg.h> |
| #include <string.h> |
| #include "plan9.h" |
| #include "utf.h" |
| |
| /* |
| * Return pointer to first occurrence of s2 in s1, |
| * 0 if none |
| */ |
| Rune* |
| runestrstr(Rune *s1, Rune *s2) |
| { |
| Rune *p, *pa, *pb; |
| int c0, c; |
| |
| c0 = *s2; |
| if(c0 == 0) |
| return s1; |
| s2++; |
| for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) { |
| pa = p; |
| for(pb=s2;; pb++) { |
| c = *pb; |
| if(c == 0) |
| return p; |
| if(c != *++pa) |
| break; |
| } |
| } |
| return 0; |
| } |