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6c84d0b1a5
the compatibility library libcompat. - Add new implementations of lsearch() and lfind() which conform to IEEE Std 1003.1-2001 to libc. Add a new manual page for them and add them to the makefile. - Add function prototypes for lsearch() and lfind() to the search.h header.
65 lines
1.6 KiB
C
65 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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*
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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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*/
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#include <sys/types.h>
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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void *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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void *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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/*
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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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*/
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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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}
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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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/*
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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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*/
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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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