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21 lines
397 B
C
21 lines
397 B
C
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#include <stdlib.h>
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void *bsearch(const void *key, const void *base, size_t nel, size_t width, int (*cmp)(const void *, const void *))
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{
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void *try;
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int sign;
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while (nel > 0) {
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try = (char *)base + width*(nel/2);
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sign = cmp(key, try);
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if (sign < 0) {
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nel /= 2;
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} else if (sign > 0) {
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base = (char *)try + width;
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nel -= nel/2+1;
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} else {
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return try;
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}
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}
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return NULL;
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}
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