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 | |
| 19 | |
| 20 | /* |
| 21 | * Return pointer to first occurrence of s2 in s1, |
| 22 | * 0 if none |
| 23 | */ |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 24 | const |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 25 | char* |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 26 | utfutf(const char *s1, const char *s2) |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 27 | { |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 28 | const char *p; |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 29 | long f, n1, n2; |
| 30 | Rune r; |
| 31 | |
| 32 | n1 = chartorune(&r, s2); |
| 33 | f = r; |
| 34 | if(f <= Runesync) /* represents self */ |
| 35 | return strstr(s1, s2); |
| 36 | |
| 37 | n2 = strlen(s2); |
Alexander Gutkin | 96039b7 | 2014-03-04 17:22:31 +0000 | [diff] [blame] | 38 | for(p=s1; (p=utfrune(p, f)) != 0; p+=n1) |
Alexander Gutkin | 439f3d1 | 2014-02-28 11:33:45 +0000 | [diff] [blame] | 39 | if(strncmp(p, s2, n2) == 0) |
| 40 | return p; |
| 41 | return 0; |
| 42 | } |