65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
|
/*
|
||
|
|
* Initial implementation:
|
||
|
|
* Copyright (c) 2002 Robert Drehmel
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* As long as the above copyright statement and this notice remain
|
||
|
|
* unchanged, you can do what ever you want with this file.
|
||
|
|
*/
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/cdefs.h>
|
||
|
|
__FBSDID("$FreeBSD$");
|
||
|
|
|
||
|
|
#define _SEARCH_PRIVATE
|
||
|
|
#include <search.h>
|
||
|
|
#include <stdint.h> /* for uint8_t */
|
||
|
|
#include <stdlib.h> /* for NULL */
|
||
|
|
#include <string.h> /* for memcpy() prototype */
|
||
|
|
|
||
|
|
static void *lwork(const void *, const void *, size_t *, size_t,
|
||
|
|
int (*)(const void *, const void *), int);
|
||
|
|
|
||
|
|
void *lsearch(const void *key, void *base, size_t *nelp, size_t width,
|
||
|
|
int (*compar)(const void *, const void *))
|
||
|
|
{
|
||
|
|
|
||
|
|
return (lwork(key, base, nelp, width, compar, 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
void *lfind(const void *key, const void *base, size_t *nelp, size_t width,
|
||
|
|
int (*compar)(const void *, const void *))
|
||
|
|
{
|
||
|
|
|
||
|
|
return (lwork(key, base, nelp, width, compar, 0));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void *
|
||
|
|
lwork(const void *key, const void *base, size_t *nelp, size_t width,
|
||
|
|
int (*compar)(const void *, const void *), int addelem)
|
||
|
|
{
|
||
|
|
uint8_t *ep, *endp;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Cast to an integer value first to avoid the warning for removing
|
||
|
|
* 'const' via a cast.
|
||
|
|
*/
|
||
|
|
ep = (uint8_t *)(uintptr_t)base;
|
||
|
|
for (endp = (uint8_t *)(ep + width * *nelp); ep < endp; ep += width) {
|
||
|
|
if (compar(key, ep) == 0)
|
||
|
|
return (ep);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* lfind() shall return when the key was not found. */
|
||
|
|
if (!addelem)
|
||
|
|
return (NULL);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* lsearch() adds the key to the end of the table and increments
|
||
|
|
* the number of elements.
|
||
|
|
*/
|
||
|
|
memcpy(endp, key, width);
|
||
|
|
++*nelp;
|
||
|
|
|
||
|
|
return (endp);
|
||
|
|
}
|