mirror of https://github.com/janet-lang/janet
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Copyright (c) 2018 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef DST_STRBINSEARCH_H_defined
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#define DST_STRBINSEARCH_H_defined
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/* Do a binary search on a static array of structs. Each struct must
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* have a string as its first element, and the struct must be sorted
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* lexogrpahically by that element. */
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static const void *dst_strbinsearch(
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const void *tab,
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size_t tabcount,
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size_t itemsize,
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const uint8_t *key) {
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size_t low = 0;
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size_t hi = tabcount;
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const char *t = (const char *)tab;
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while (low < hi) {
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size_t mid = low + ((hi - low) / 2);
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const char **item = (const char **)(t + mid * itemsize);
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const char *name = *item;
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int comp = dst_cstrcmp(key, name);
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if (comp < 0) {
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hi = mid;
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} else if (comp > 0) {
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low = mid + 1;
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} else {
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return (const void *)item;
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}
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}
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return NULL;
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}
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#endif
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