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/*
* Copyright (c) 2026 Dylan Araps
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef DYLAN_ARG
#define DYLAN_ARG
struct argv {
const char *const *argv;
int c;
};
struct arg {
const char *pos;
int sign;
int name;
};
static inline struct argv
arg_init(int argc, char *a[])
{
(void) argc;
return (struct argv) { .argv = (const char *const *) ++a };
}
static inline struct arg
arg_next(struct argv *s)
{
static const signed char t[256] = {
['-'] = '-' - 1, ['+'] = '+' - 1,
};
struct arg a = {0};
a.pos = *s->argv;
a.sign = a.pos ? t[(unsigned char) **s->argv] + 1 : -1;
if (a.sign > 1) {
s->c |= !s->c;
a.name = (unsigned char) (a.pos[s->c] ? a.pos[s->c] : a.sign);
s->c += !!a.pos[s->c];
s->c *= !!a.pos[s->c];
}
s->argv += !s->c;
return a;
}
static inline const char *
arg_next_positional(struct argv *s)
{
const char *a = *s->argv;
if (!a) return a;
a += s->c;
s->c = 0;
s->argv++;
return a;
}
#endif // DYLAN_ARG
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