93 lines
3.2 KiB
C
93 lines
3.2 KiB
C
|
/*
|
||
|
|
* Copyright (c) 1989, 1993
|
||
|
|
* The Regents of the University of California. All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to Berkeley by
|
||
|
|
* Roger L. Snyder.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
static char sccsid[] = "@(#)lsearch.c 8.1 (Berkeley) 6/4/93";
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
static char *linear_base();
|
||
|
|
|
||
|
|
char *
|
||
|
|
lsearch(key, base, nelp, width, compar)
|
||
|
|
char *key, *base;
|
||
|
|
u_int *nelp, width;
|
||
|
|
int (*compar)();
|
||
|
|
{
|
||
|
|
return(linear_base(key, base, nelp, width, compar, 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
char *
|
||
|
|
lfind(key, base, nelp, width, compar)
|
||
|
|
char *key, *base;
|
||
|
|
u_int *nelp, width;
|
||
|
|
int (*compar)();
|
||
|
|
{
|
||
|
|
return(linear_base(key, base, nelp, width, compar, 0));
|
||
|
|
}
|
||
|
|
|
||
|
|
static char *
|
||
|
|
linear_base(key, base, nelp, width, compar, add_flag)
|
||
|
|
char *key, *base;
|
||
|
|
u_int *nelp, width;
|
||
|
|
int (*compar)(), add_flag;
|
||
|
|
{
|
||
|
|
register char *element, *end;
|
||
|
|
|
||
|
|
end = base + *nelp * width;
|
||
|
|
for (element = base; element < end; element += width)
|
||
|
|
if (!compar(element, key)) /* key found */
|
||
|
|
return(element);
|
||
|
|
|
||
|
|
if (!add_flag) /* key not found */
|
||
|
|
return(NULL);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The UNIX System User's Manual, 1986 edition claims that
|
||
|
|
* a NULL pointer is returned by lsearch with errno set
|
||
|
|
* appropriately, if there is not enough room in the table
|
||
|
|
* to add a new item. This can't be done as none of these
|
||
|
|
* routines have any method of determining the size of the
|
||
|
|
* table. This comment was isn't in the 1986-87 System V
|
||
|
|
* manual.
|
||
|
|
*/
|
||
|
|
++*nelp;
|
||
|
|
bcopy(key, end, (int)width);
|
||
|
|
return(end);
|
||
|
|
}
|