#include <u.h>#include <libc.h>#include <bio.h>#include "diff.h" Biobuf	stdout;char	mode;			/* '\0', 'e', 'f', 'h' */char	bflag;			/* ignore multiple and trailing blanks */char	rflag;			/* recurse down directory trees */char	mflag;			/* pseudo flag: doing multiple files, one dir */int	anychange; static char *tmp[] = {"/tmp/diff1XXXXXXXXXXX", "/tmp/diff2XXXXXXXXXXX"};static int whichtmp; void *emalloc(unsigned n){	register void *p; 	if ((p = malloc(n)) == 0)		sysfatal("malloc: %r");	return p;} void *erealloc(void *p, unsigned n){	void *rp; 	if ((rp = realloc(p, n)) == 0)		sysfatal("realloc: %r");	return rp;} intmkpathname(char *pathname, char *path, char *name){	if (strlen(path) + strlen(name) > MAXPATHLEN)		sysfatal("pathname %s/%s too long", path, name);	sprint(pathname, "%s/%s", path, name);	return 0;} char *mktmpfile(int input, Dir **sb){	int fd, i;	char *p;	char buf[8192]; 	p = mktemp(tmp[whichtmp++]);	/*	 * Because we want this file to stick around	 * for the entire run of the program, we leak	 * the fd intentionally here; when we exit,	 * the system will remove the file for us.	 */	fd = create(p, OWRITE|ORCLOSE, 0600);	if (fd < 0)		sysfatal("cannot create %s: %r", p);	while ((i = read(input, buf, sizeof(buf))) > 0) {		if ((i = write(fd, buf, i)) < 0)			break;	}	*sb = dirfstat(fd);	if (i < 0)		sysfatal("cannot read/write %s: %r", p);	return p;} char *statfile(char *file, Dir **sb){	Dir *dir;	int input; 	dir = dirstat(file);	if(dir == nil) {		if (strcmp(file, "-") || (dir = dirfstat(0)) == nil)			sysfatal("cannot stat %s: %r", file);		free(dir);		return mktmpfile(0, sb);	} else if (!REGULAR_FILE(dir) && !DIRECTORY(dir)) {		free(dir);		if ((input = open(file, OREAD)) == -1)			sysfatal("cannot open %s: %r", file);		file = mktmpfile(input, sb);		close(input);	} else		*sb = dir;	return file;}