29 lines
693 B
C
29 lines
693 B
C
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
/* $Id$ */
|
|
|
|
#include <stdlib.h>
|
|
|
|
void *
|
|
bsearch(register const void *key, register const void *base,
|
|
register size_t nmemb, register size_t size,
|
|
int (*compar)(const void *, const void *))
|
|
{
|
|
register const void *mid_point;
|
|
register int cmp;
|
|
|
|
while (nmemb > 0) {
|
|
mid_point = (char *)base + size * (nmemb >> 1);
|
|
if ((cmp = (*compar)(key, mid_point)) == 0)
|
|
return (void *)mid_point;
|
|
if (cmp >= 0) {
|
|
base = (char *)mid_point + size;
|
|
nmemb = (nmemb - 1) >> 1;
|
|
} else
|
|
nmemb >>= 1;
|
|
}
|
|
return (void *)NULL;
|
|
}
|