#include <u.h>#include <libc.h>#include <bio.h>#include "diff.h" void	done(int status){	switch(status)	{	case 0:		exits("");	case 1:		exits("some");	default:		exits("error");	}} voidusage(void){	fprint(2, "usage: %s [-abcefmnrw] file1 ... file2\n", argv0);	exits("usage");} voidmain(int argc, char *argv[]){	int i;	Dir *fsb, *tsb; 	Binit(&stdout, 1, OWRITE);	ARGBEGIN{	case 'e':	case 'f':	case 'n':	case 'c':	case 'a':	case 'u':		mode = ARGC();		break;	case 'w':		bflag = 2;		break; 	case 'b':		bflag = 1;		break; 	case 'r':		rflag = 1;		break; 	case 'm':		mflag = 1;			break; 	case 'h':	default:		usage();	}ARGEND;	if (argc < 2)		usage();	if ((tsb = dirstat(argv[argc-1])) == nil)		sysfatal("can't stat %s", argv[argc-1]);	if (argc > 2) {		if (!DIRECTORY(tsb))			sysfatal("not directory: %s", argv[argc-1]);		mflag = 1;	} else {		if ((fsb = dirstat(argv[0])) == nil)			sysfatal("can't stat %s", argv[0]);		if (DIRECTORY(fsb) && DIRECTORY(tsb))			mflag = 1;		free(fsb);	}	free(tsb);	for (i = 0; i < argc-1; i++)		diff(argv[i], argv[argc-1], 0);			done(anychange);	/*NOTREACHED*/}