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/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
#include <stdlib.h>
#include <libc/unconst.h>
void *
bsearch(const void *key
, const void *base0
, size_t nelem
,
size_t size, int (*cmp)(const void *ck, const void *ce))
{
char *base = unconst(base0, char *);
int lim, cmpval;
void *p;
for (lim = nelem; lim != 0; lim >>= 1)
{
p = base + (lim >> 1) * size;
cmpval = (*cmp)(key, p);
if (cmpval == 0)
return p;
if (cmpval > 0)
{ /* key > p: move right */
base = (char *)p + size;
lim--;
} /* else move left */
}
return 0;
}