| /* |
| * 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 "utf.h" |
| #include "utfdef.h" |
| |
| const |
| char* |
| utfrune(const char *s, Rune c) |
| { |
| long c1; |
| Rune r; |
| int n; |
| |
| if(c < Runesync) /* not part of utf sequence */ |
| return strchr(s, c); |
| |
| for(;;) { |
| c1 = *(uchar*)s; |
| if(c1 < Runeself) { /* one byte rune */ |
| if(c1 == 0) |
| return 0; |
| if(c1 == c) |
| return s; |
| s++; |
| continue; |
| } |
| n = chartorune(&r, s); |
| if(r == c) |
| return s; |
| s += n; |
| } |
| return 0; |
| } |