| /* Copyright (C) 1991,92,97,2000,02 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <stdlib.h> |
| |
| |
| /* Perform a binary search for KEY in BASE which has NMEMB elements |
| of SIZE bytes each. The comparisons are done by (*COMPAR)(). */ |
| void * |
| bsearch (const void *key, const void *base, size_t nmemb, size_t size, |
| int (*compar) (const void *, const void *)) |
| { |
| size_t l, u, idx; |
| const void *p; |
| int comparison; |
| |
| l = 0; |
| u = nmemb; |
| while (l < u) |
| { |
| idx = (l + u) / 2; |
| p = (void *) (((const char *) base) + (idx * size)); |
| comparison = (*compar) (key, p); |
| if (comparison < 0) |
| u = idx; |
| else if (comparison > 0) |
| l = idx + 1; |
| else |
| return (void *) p; |
| } |
| |
| return NULL; |
| } |
| libc_hidden_def (bsearch) |