feuille/arg.h

/*
 * arg.h
 *  Arg parsing.
 *
 * Copyright (c) 2016
 *     Christoph Lohmann <20h at r-36 dot net>
 *
 * This file is licensed under the MIT License.
 *
 * 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.
 */

/*
 * Copy me if you can.
 * by 20h
 */

#pragma once

#ifndef COSMOPOLITAN
#include <stdlib.h>
#include <stddef.h>
#endif

extern char *argv0;

/* use main(int argc, char *argv[]) */
#define ARGBEGIN    for (argv0 = *argv, argv++, argc--;\
                    argv[0] && argv[0][0] == '-'\
                    && argv[0][1];\
                    argc--, argv++) {\
                char argc_;\
                char **argv_;\
                int brk_;\
                if (argv[0][1] == '-' && argv[0][2] == '\0') {\
                    argv++;\
                    argc--;\
                    break;\
                }\
                int i_;\
                for (i_ = 1, brk_ = 0, argv_ = argv;\
                        argv[0][i_] && !brk_;\
                        i_++) {\
                    if (argv_ != argv)\
                        break;\
                    argc_ = argv[0][i_];\
                    switch (argc_)

#define ARGEND          }\
            }

#define ARGC()      argc_

#define EARGF(x)    ((argv[0][i_+1] == '\0' && argv[1] == NULL)?\
                ((x), abort(), (char *)0) :\
                (brk_ = 1, (argv[0][i_+1] != '\0')?\
                    (&argv[0][i_+1]) :\
                    (argc--, argv++, argv[0])))

#define ARGF()      ((argv[0][i_+1] == '\0' && argv[1] == NULL)?\
                (char *)0 :\
                (brk_ = 1, (argv[0][i_+1] != '\0')?\
                    (&argv[0][i_+1]) :\
                    (argc--, argv++, argv[0])))