d8fa82cb91
Almost nothing changes here except moving braces to the same line as the function declaration. Everything else is largely whitespace changes and a few dangling files with tab indents. See scripts/codestyle
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <stdlib.h>
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void *bsearch(const void *key, const void *base, size_t num_elems, size_t size,
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int (*compare)(const void *, const void *)) {
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size_t low = 0, high = num_elems - 1;
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if (num_elems == 0) {
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return NULL;
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}
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for (;;) {
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size_t mid = low + ((high - low) / 2);
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const void *mid_elem = ((unsigned char *) base) + mid*size;
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int r = compare(key, mid_elem);
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if (r < 0) {
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if (mid == 0) {
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return NULL;
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}
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high = mid - 1;
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} else if (r > 0) {
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low = mid + 1;
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if (low < mid || low > high) {
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return NULL;
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}
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} else {
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return (void *) mid_elem;
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}
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}
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}
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