arg.h

/*
 * ISC-License
 *
 * Copyright 2004-2017 Christoph Lohmann <20h@r-36.net>
 * Copyright 2017-2018 Laslo Hunhold <dev@frign.de>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef ARG_H
#define ARG_H

extern char *argv0;

/* int main(int argc, char *argv[]) */
#define ARGBEGIN for (argv0 = *argv, *argv ? (argc--, argv++) : 0;            \
                      *argv && (*argv)[0] == '-' && (                         \
                          (*argv)[1] == '-' && !(*argv)[2] ?                  \
                          (argc--, argv++, 0) : (*argv)[1]);                  \
                      argc--, argv++)                                         \
                 {                                                            \
                    char *arg_;                                           \
                    int argused_;                                         \
                    for (arg_ = *argv + 1, argused_ = 0; *arg_; arg_++) { \
                        switch(*arg_)
#define ARGEND          if (argused_) {                               \
                            if (! arg_[1])                        \
                                argc--, argv++;               \
                            break;                                \
                        }                                             \
                    }                                                     \
                 }
#define ARGC()   (*arg_)
#define ARGF_(x) (arg_[1] ? (argused_ = 1, arg_ + 1) :                        \
                  argv[1] ? (argused_ = 1, argv[1] ) : (x))
#define EARGF(x) ARGF_(( (x), exit(1), NULL))
#define ARGF()   ARGF_(NULL)

#endif