farbfeld

suckless image format with conversion tools
git clone git://git.suckless.org/farbfeld
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arg.h (2504B)


      1 /*
      2  * ISC-License
      3  *
      4  * Copyright 2004-2017 Christoph Lohmann <20h@r-36.net>
      5  * Copyright 2017-2018 Laslo Hunhold <dev@frign.de>
      6  *
      7  * Permission to use, copy, modify, and/or distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 #ifndef ARG_H
     20 #define ARG_H
     21 
     22 extern char *argv0;
     23 
     24 /* int main(int argc, char *argv[]) */
     25 #define ARGBEGIN for (argv0 = *argv, *argv ? (argc--, argv++) : ((void *)0);      \
     26                       *argv && (*argv)[0] == '-' && (*argv)[1]; argc--, argv++) { \
     27                  	int i_, argused_;                                         \
     28                  	if ((*argv)[1] == '-' && !(*argv)[2]) {                   \
     29                  		argc--, argv++;                                   \
     30                  		break;                                            \
     31                  	}                                                         \
     32                  	for (i_ = 1, argused_ = 0; (*argv)[i_]; i_++) {           \
     33                  		switch((*argv)[i_])
     34 #define ARGEND   		if (argused_) {                                   \
     35                  			if ((*argv)[i_ + 1]) {                    \
     36                  				break;                            \
     37                  			} else {                                  \
     38                  				argc--, argv++;                   \
     39                  				break;                            \
     40                  			}                                         \
     41                  		}                                                 \
     42                  	}                                                         \
     43                  }
     44 #define ARGC()   ((*argv)[i_])
     45 #define ARGF_(x) (((*argv)[i_ + 1]) ? (argused_ = 1, &((*argv)[i_ + 1])) :        \
     46                   (*(argv + 1))     ? (argused_ = 1, *(argv + 1))        : (x))
     47 #define EARGF(x) ARGF_(((x), exit(1), (char *)0))
     48 #define ARGF()   ARGF_((char *)0)
     49 
     50 #endif