#define USED(x) ((void)x)
#define ARGBEGIN for((argv0||(argv0=*argv)),argv++,argc--;\
argv[0] && argv[0][0]=='-' && argv[0][1];\
if(_args[0]=='-' && _args[1]==0){\
while(*_args && (_argc = *_args++))\
#define ARGEND SET(_argt);USED(_argt);USED(_argc);USED(_args);}USED(argv);USED(argc);
#define ARGF() (_argt=_args, _args=(char*)"",\
(*_argt? _argt: argv[1]? (argc--, *++argv): 0))
#define EARGF(x) (_argt=_args, _args=(char*)"",\
(*_argt? _argt: argv[1]? (argc--, *++argv): ((x), abort(), (char*)0)))