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;extern Biobuf	stdout;extern int	binary; #define MALLOC(t, n)		((t *)emalloc((n)*sizeof(t)))#define REALLOC(p, t, n)	((t *)erealloc((void *)(p), (n)*sizeof(t)))#define FREE(p)			free((void *)(p)) #define MAXPATHLEN	1024 int mkpathname(char *, char *, char *);void *emalloc(unsigned);void *erealloc(void *, unsigned);void diff(char *, char *, int);void diffdir(char *, char *, int);void diffreg(char *, char *);Biobuf *prepare(int, char *);void panic(int, char *, ...);void check(Biobuf *, Biobuf *);void change(int, int, int, int);void flushchanges(void);