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28 lines
546 B
C
28 lines
546 B
C
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#include <string.h>
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/*
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* @implemented
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*/
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void *
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bsearch(const void *key, const void *base0, size_t nelem,
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size_t size, int (*cmp)(const void *ck, const void *ce))
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{
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const char *base = base0;
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int lim, cmpval;
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const void *p;
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for (lim = nelem; lim != 0; lim >>= 1)
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{
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p = base + (lim >> 1) * size;
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cmpval = (*cmp)(key, p);
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if (cmpval == 0)
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return (void*)((size_t)p);
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if (cmpval > 0)
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{ /* key > p: move right */
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base = (const char *)p + size;
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lim--;
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} /* else move left */
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}
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return 0;
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}
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