xref: /freebsd/contrib/less/charset.h (revision d9a42747950146bf03cda7f6e25d219253f8a57a)
1 /*
2  * Copyright (C) 1984-2022  Mark Nudelman
3  *
4  * You may distribute under the terms of either the GNU General Public
5  * License or the Less License, as specified in the README file.
6  *
7  * For more information, see the README file.
8  */
9 
10 #define IS_ASCII_OCTET(c)   (((c) & 0x80) == 0)
11 #define IS_UTF8_TRAIL(c)    (((c) & 0xC0) == 0x80)
12 #define IS_UTF8_LEAD2(c)    (((c) & 0xE0) == 0xC0)
13 #define IS_UTF8_LEAD3(c)    (((c) & 0xF0) == 0xE0)
14 #define IS_UTF8_LEAD4(c)    (((c) & 0xF8) == 0xF0)
15 #define IS_UTF8_LEAD5(c)    (((c) & 0xFC) == 0xF8)
16 #define IS_UTF8_LEAD6(c)    (((c) & 0xFE) == 0xFC)
17 #define IS_UTF8_INVALID(c)  (((c) & 0xFE) == 0xFE)
18 #define IS_UTF8_LEAD(c)     (((c) & 0xC0) == 0xC0 && !IS_UTF8_INVALID(c))
19