30 lines
669 B
C
30 lines
669 B
C
|
/* 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
|