text: typedef unsigned short Rune;		/* 16 bits */
  typedef unsigned char uchar;
  #define		Runeerror	0x80	/* decoding error in UTF */
  #define		Runeself	0x80	/* rune and UTF sequences are the same (<) */
  #define		UTFmax		6	/* maximum bytes per rune */
  
  /*
  	plan 9 argument parsing
  */
  #define	ARGBEGIN	for((argv0? 0: (argv0= *argv)),argv++,argc--;\
  			    argv[0] && argv[0][0]=='-' && argv[0][1];\
  			    argc--, argv++) {\
  				char *_args, *_argt, _argc;\
  				_args = &argv[0][1];\
  				if(_args[0]=='-' && _args[1]==0){\
  					argc--; argv++; break;\
  				}\
  				_argc=0;while(*_args) switch(_argc= *_args++)
  #define	ARGEND		}
  #define	ARGF()		(_argt=_args, _args="",\
  				(*_argt? _argt: argv[1]? (argc--, *++argv): 0))
  #define	ARGC()		_argc
  extern char *argv0;
  