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