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git-subtree-dir: contrib/wireguard-tools git-subtree-mainline:9142a2a37bgit-subtree-split:7e00bf8773
30 lines
676 B
C
30 lines
676 B
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* Specialized constant-time ctype.h reimplementations that aren't locale-specific.
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*/
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#ifndef CTYPE_H
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#define CTYPE_H
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#include <stdbool.h>
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static inline bool char_is_space(int c)
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{
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unsigned char d = c - 9;
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return (0x80001FU >> (d & 31)) & (1U >> (d >> 5));
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}
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static inline bool char_is_digit(int c)
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{
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return (unsigned int)(('0' - 1 - c) & (c - ('9' + 1))) >> (sizeof(c) * 8 - 1);
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}
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static inline bool char_is_alpha(int c)
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{
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return (unsigned int)(('a' - 1 - (c | 32)) & ((c | 32) - ('z' + 1))) >> (sizeof(c) * 8 - 1);
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}
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#endif
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