84d9c625bf
- Fix for possible unset uid/gid in toproto
- Fix for default mtree style
- Update libelf
- Importing libexecinfo
- Resynchronize GCC, mpc, gmp, mpfr
- build.sh: Replace params with show-params.
This has been done as the make target has been renamed in the same
way, while a new target named params has been added. This new
target generates a file containing all the parameters, instead of
printing it on the console.
- Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
get getservbyport() out of the inner loop
Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
85 lines
3.5 KiB
C
85 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static const char sccsid[] = "@(#)bsearch.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "port.h"
|
|
|
|
/*
|
|
* Perform a binary search.
|
|
*
|
|
* The code below is a bit sneaky. After a comparison fails, we
|
|
* divide the work in half by moving either left or right. If lim
|
|
* is odd, moving left simply involves halving lim: e.g., when lim
|
|
* is 5 we look at item 2, so we change lim to 2 so that we will
|
|
* look at items 0 & 1. If lim is even, the same applies. If lim
|
|
* is odd, moving right again involes halving lim, this time moving
|
|
* the base up one item past p: e.g., when lim is 5 we change base
|
|
* to item 3 and make lim 2 so that we will look at items 3 and 4.
|
|
* If lim is even, however, we have to shrink it by one before
|
|
* halving: e.g., when lim is 4, we still looked at item 2, so we
|
|
* have to make lim 3, then halve, obtaining 1, so that we will only
|
|
* look at item 3.
|
|
*
|
|
* PUBLIC: #ifndef HAVE_BSEARCH
|
|
* PUBLIC: void *bsearch __P((const void *, const void *, size_t,
|
|
* PUBLIC: size_t, int (*)(const void *, const void *)));
|
|
* PUBLIC: #endif
|
|
*/
|
|
void *
|
|
bsearch(register const void *key, const void *base0, size_t nmemb, register size_t size, register int (*compar) (const void *, const void *))
|
|
{
|
|
register const char *base = base0;
|
|
register size_t lim;
|
|
register int cmp;
|
|
register const void *p;
|
|
|
|
for (lim = nmemb; lim != 0; lim >>= 1) {
|
|
p = base + (lim >> 1) * size;
|
|
cmp = (*compar)(key, p);
|
|
if (cmp == 0)
|
|
return ((void *)p);
|
|
if (cmp > 0) { /* key > p: move right */
|
|
base = (char *)p + size;
|
|
lim--;
|
|
} /* else move left */
|
|
}
|
|
return (NULL);
|
|
}
|