| /* 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 |
