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25 lines
543 B
C
25 lines
543 B
C
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// -*- c++ -*-
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#ifndef COSMOPOLITAN_LIBC_STR_HAS_CHAR_H_
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#define COSMOPOLITAN_LIBC_STR_HAS_CHAR_H_
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#ifdef __cplusplus
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template <typename T>
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static bool has_char(const T (*ranges)[2], size_t n, T c) {
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unsigned l = 0;
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unsigned r = n;
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while (l < r) {
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unsigned m = (l & r) + ((l ^ r) >> 1); // floor((a+b)/2)
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if (c < ranges[m][0]) {
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r = m;
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} else if (c > ranges[m][1]) {
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l = m + 1;
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} else {
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return true;
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}
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}
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return false;
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}
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#endif /* __cplusplus */
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#endif /* COSMOPOLITAN_LIBC_STR_HAS_CHAR_H_ */
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