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