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