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/*
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 <assert.h>
# include <stdbool.h>
# include <stdlib.h>
# include <u8c/SIZE_C.h>
# include <u8c/u32alloc.h>
# include <u8c/u32free.h>
# include <u8c/u32substr.h>
# include <u8c/u32sz.h>
# include <uchar.h>
bool u8c_u32substr(char32_t const * * const _out,size_t const _start,size_t const _len,char32_t const * const _in) {
assert(_out != NULL);
assert(_in != NULL);
u8c_u32free(_out);
size_t insz = SIZE_C(0x0);
u8c_u32sz(&insz,_in);
size_t len = _len;
if(_len == SIZE_C(0x0)) {
len = insz - _start;
}
if(insz < _start + len) {
return true;
}
size_t const outsz = len + SIZE_C(0x2);
char32_t * out = NULL;
if(u8c_u32alloc(&out,outsz)) {
return true;
}
for(register size_t n = SIZE_C(0x0);n <= len;n += SIZE_C(0x1)) {
out[n] = _in[n + _start];
}
*_out = out;
return false;
}
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