/*
* Copyright 2009 Red Hat Inc., Durham, North Carolina.
* All Rights Reserved.
*
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Lukas Kuklinek <lkuklinek@redhat.com>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stddef.h>
#ifdef OS_WINDOWS
#include <io.h>
#else
#include <unistd.h>
#endif
#include <stdint.h>
#include <assert.h>
#include "bfind.h"
void *oscap_bfind(void *ptr, size_t nmemb, size_t size, void *key, int cmpfn(void *, void *))
{
size_t w, s;
int cmp;
uint8_t *p;
w = nmemb;
s = 0;
p = (uint8_t *) ptr;
while (w > 0) {
cmp = cmpfn(key, p + (size * (s + w / 2)));
if (cmp > 0) {
s += w / 2 + 1;
w = w - w / 2 - 1;
} else if (cmp < 0) {
w = w / 2;
} else {
return ((void *)(p + (size * (s + w / 2))));
}
}
return (NULL);
}
int32_t oscap_bfind_i(void *ptr, size_t nmemb, size_t size, void *key, int cmpfn(void *, void *), size_t *save)
{
size_t w, s;
int cmp;
uint8_t *p;
w = nmemb;
s = 0;
p = (uint8_t *) ptr;
while (w > 0) {
cmp = cmpfn(key, p + (size * (s + w / 2)));
if (cmp > 0) {
s += w / 2 + 1;
w = w - w / 2 - 1;
} else if (cmp < 0) {
w = w / 2;
} else {
assert((s + w / 2) <= INT32_MAX);
return ((int32_t) (s + w / 2));
}
}
if (save != NULL)
*save = s;
return INT32_C(-1);
}