a/arg.h

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

#ifndef ARG_H__
#define ARG_H__

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])))

#endif