zap/source/any/mem/utf8enclen.c


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
26
27
28
29
30
31
32

/*
	Copyright 2022-2023 Gabriel Jensen.
	This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
	If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>.
*/

#include <zap/mem.h>

zap_sz zap_utf8enclen(zap_chr02 const * const _buf) {
	zap_sz len = 0x0u;
	zap_chr02 const * pos;
	for (pos = _buf;;++pos) {
		zap_chr02 const chr = *pos;
		if (chr == 0x0u) {
			break;
		}
		if (chr >= 0x10000u) {
			len += 0x4u;
			continue;
		}
		if (chr >= 0x800u) {
			len += 0x3u;
			continue;
		}
		if (chr >= 0x80u) {
			len += 0x2u;
			continue;
		}
		++len;
	}
	return len;
}