Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 1 | /* |
| 2 | * The authors of this software are Rob Pike and Ken Thompson. |
| 3 | * Copyright (c) 2002 by Lucent Technologies. |
| 4 | * Permission to use, copy, modify, and distribute this software for any |
| 5 | * purpose without fee is hereby granted, provided that this entire notice |
| 6 | * is included in all copies of any software which is or includes a copy |
| 7 | * or modification of this software and in all copies of the supporting |
| 8 | * documentation for such software. |
| 9 | * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 10 | * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY |
| 11 | * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 12 | * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. |
| 13 | */ |
| 14 | #include <stdarg.h> |
| 15 | #include <string.h> |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 16 | #include "utf.h" |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 17 | #include "utfdef.h" |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 18 | |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 19 | const |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 20 | char* |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 21 | utfrune(const char *s, Rune c) |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 22 | { |
| 23 | long c1; |
| 24 | Rune r; |
| 25 | int n; |
| 26 | |
| 27 | if(c < Runesync) /* not part of utf sequence */ |
| 28 | return strchr(s, c); |
| 29 | |
| 30 | for(;;) { |
| 31 | c1 = *(uchar*)s; |
| 32 | if(c1 < Runeself) { /* one byte rune */ |
| 33 | if(c1 == 0) |
| 34 | return 0; |
| 35 | if(c1 == c) |
| 36 | return s; |
| 37 | s++; |
| 38 | continue; |
| 39 | } |
| 40 | n = chartorune(&r, s); |
| 41 | if(r == c) |
| 42 | return s; |
| 43 | s += n; |
| 44 | } |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 45 | return 0; |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 46 | } |