blob: b9daac5be016a63866db0bb05ae3892efa47669f (
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
Copyright 2021 Gabriel Jensen
This file is part of u8c.
u8c is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
u8c is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with u8c.
If not, see <https://www.gnu.org/licenses/>.
*/
# include <stdbool.h>
# include <stdlib.h>
# include <u8c/SIZE_C.h>
# include <u8c/str.h>
# include <uchar.h>
struct u8c_strsubstr_tuple u8c_strsubstr(size_t const _start,size_t const _len,char32_t const * const restrict _in) {
struct u8c_strsubstr_tuple ret = {
.stat = false,
};
size_t insz = u8c_strsz(_in).sz;
size_t len = _len;
if(_len == SIZE_C(0x0)) {
len = insz - _start;
}
if(insz < _start + len) {
return ret;
}
size_t const outsz = len + SIZE_C(0x2);
char32_t * out = NULL;
{
struct u8c_stralloc_tuple const tuple = u8c_stralloc(outsz);
if(tuple.stat) {
ret.stat = true;
return ret;
}
out = tuple.str;
}
for(register size_t n = SIZE_C(0x0);n <= len;n += SIZE_C(0x1)) {
out[n] = _in[n + _start];
}
ret.str = out;
return ret;
}
|
