about summary refs log tree commit diff
path: root/src/multibyte/internal.h
blob: cc017fa27761638c1bdb97a600bf447bd7a1dfdf (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
/* 
 * This code was written by Rich Felker in 2010; no copyright is claimed.
 * This code is in the public domain. Attribution is appreciated but
 * unnecessary.
 */

#define bittab __fsmu8

#include <stdint.h>

#ifdef __PIC__
__attribute__((__visibility__("hidden")))
#endif
extern const uint32_t bittab[];

/* Upper 6 state bits are a negative integer offset to bound-check next byte */
/*    equivalent to: ( (b-0x80) | (b+offset) ) & ~0x3f      */
#define OOB(c,b) (((((b)>>3)-0x10)|(((b)>>3)+((int32_t)(c)>>26))) & ~7)

/* Interval [a,b). Either a must be 80 or b must be c0, lower 3 bits clear. */
#define R(a,b) ((uint32_t)((a==0x80 ? 0x40-b : -a) << 23))
#define FAILSTATE R(0x80,0x80)

#define SA 0xc2u
#define SB 0xf4u