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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/errno.h>
#include <unistd.h>
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
char *optarg;
int optind, opterr, optopt;
int
getopt(int argc, char *argv[], const char *optstring)
{
size_t optstr_len;
char *arg;
bool has_arg = false;
if (argc == 0 || optstring == NULL) {
opterr = -EINVAL;
return -1;
}
if (optind >= argc) {
return -1;
}
arg = argv[optind];
optstr_len = strlen(optstring);
/* Non option argument? */
if (arg[0] != '-') {
return -1;
}
/*
* We will look through each possible flag/option
* in the optstring and match it against our arg.
*/
for (size_t i = 0; i < optstr_len; ++i) {
if (arg[1] != optstring[i]) {
continue;
}
/*
* If this option has a ':' right next to it,
* it also has an argument.
*/
if (i < optstr_len - 1) {
if (optstring[i + 1] == ':') {
has_arg = true;
}
}
break;
}
/*
* Handle cases where the option has an argument
* with it (-opt=arg)
*/
if (has_arg && optind < argc ) {
if (arg[2] != '=') {
opterr = -EINVAL;
return -1;
}
optarg = &arg[3];
++optind;
}
++optind;
return arg[1];
}
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