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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stddef.h>
#include "internal/cryptlib.h"
const void *ossl_bsearch(const void *key, const void *base, int num,
int size, int (*cmp) (const void *, const void *),
int flags)
{
const char *base_ = base;
int l, h, i = 0, c = 0;
const char *p = NULL;
if (num == 0)
return NULL;
l = 0;
h = num;
while (l < h) {
i = (l + h) / 2;
p = &(base_[i * size]);
c = (*cmp) (key, p);
if (c < 0)
h = i;
else if (c > 0)
l = i + 1;
else
break;
}
if (c != 0 && !(flags & OSSL_BSEARCH_VALUE_ON_NOMATCH))
p = NULL;
else if (c == 0 && (flags & OSSL_BSEARCH_FIRST_VALUE_ON_MATCH)) {
while (i > 0 && (*cmp) (key, &(base_[(i - 1) * size])) == 0)
i--;
p = &(base_[i * size]);
}
return p;
}
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