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][0] == '-') {\
					if (argv[0][1] == '-' && argv[0][2] == '\0') {\
						argv++;\
						argc--;\
						break;\
					}\
					for (brk_ = 0, argv[0]++, argv_ = argv;\
							argv[0][0] && !brk_;\
							argv[0]++) {\
						if (argv_ != argv)\
							break;\
						argc_ = argv[0][0];\
						switch (argc_)

/* Handles obsolete -NUM syntax */
#define ARGNUM					case '0':\
						case '1':\
						case '2':\
						case '3':\
						case '4':\
						case '5':\
						case '6':\
						case '7':\
						case '8':\
						case '9'

#define ARGALT(SYMBOL)			}\
				} else if (argv[0][0] == SYMBOL) {\
					for (brk_ = 0, argv[0]++, argv_ = argv;\
							argv[0][0] && !brk_;\
							argv[0]++) {\
						if (argv_ != argv)\
							break;\
						argc_ = argv[0][0];\
						switch (argc_)

#define ARGEND				}\
				} else {\
					break;\
				}\
			}

#define ARGC()		argc_

#define ARGNUMF()	(brk_ = 1, estrtonum(argv[0], 0, INT_MAX))

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

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

#define UARGF()		EARGF(usage())

#define LNGARG()	&argv[0][0]

#define UNOFLAGS(...)	ARGBEGIN {\
			default:\
				usage();\
			} ARGEND;\
			if (__VA_ARGS__)\
				usage()


#endif