Colin Cross | 7bb052a | 2015-02-03 12:59:37 -0800 | [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 |
| 10 | * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY |
| 11 | * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY |
| 12 | * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. |
| 13 | */ |
| 14 | #include <u.h> |
| 15 | #include <libc.h> |
| 16 | #include "utf.h" |
| 17 | #include "utfdef.h" |
| 18 | |
| 19 | |
| 20 | /* |
| 21 | * Return pointer to first occurrence of s2 in s1, |
| 22 | * 0 if none |
| 23 | */ |
| 24 | const |
| 25 | char* |
| 26 | utfutf(const char *s1, const char *s2) |
| 27 | { |
| 28 | const char *p; |
| 29 | long f, n1; |
| 30 | size_t n2; |
| 31 | Rune r; |
| 32 | |
| 33 | n1 = chartorune(&r, s2); |
| 34 | f = r; |
| 35 | if(f <= Runesync) /* represents self */ |
| 36 | return strstr(s1, s2); |
| 37 | |
| 38 | n2 = strlen(s2); |
| 39 | for(p=s1; (p=utfrune(p, r)) != 0; p+=n1) |
| 40 | if(strncmp(p, s2, n2) == 0) |
| 41 | return p; |
| 42 | return 0; |
| 43 | } |