#include	<sys/types.h>#include	<sys/stat.h>	/* open() & mail_open() mode */#include	<fcntl.h>		/* open() & mail_open() flags */#include	<stddef.h>		/* NULL */#include	<time.h>#include	"ourhdr.h"#include	"pass.h"		/* flags for mail_store() */#define  TMPMSGFILE  "message" #define ANYIDX 		0                 /*any index(writew_lock(mail->idxfd,*/#define	FREEIDX 	1		 /* free index*/ #define	REALIDX 	2		 /* not free index*/		/* magic numbers */#define	IDXLEN_SZ	   4	/* #ascii chars for length of index record */#define	IDXLEN_MIN	   6	/* key, sep, start, sep, length, newline */#define	IDXLEN_MAX	1024	/* arbitrary */#define	SEP		'|'	/* separator character in index record */#define	DATLEN_MIN	   2	/* data byte, newline */#define	DATLEN_MAX	1024	/* arbitrary */		/* following definitions are for hash chains and free list chain		   in index file */#define	PTR_SZ		   6	/* size of ptr field in hash chain */#define	PTR_MAX   999999	/* max offset (file size) = 10**PTR_SZ - 1 */#define	NHASH_DEF	 137	/* default hash table size */#define	FREE_OFF	   0	/* offset of ptr to free list in index file */#define	HASH_OFF  PTR_SZ	/* offset of hash table in index file */char *hint;/*const for message hint*//*struct message **msgpp;point to the content of the message for client to get message*/typedef struct {	/* our internal structure */  int	idxfd;	/* fd for index file */  int	datfd;	/* fd for data file */  int	oflag;	/* flags for open()/mail_open(): O_xxx */  char  *keybuf;  char	*idxbuf;/* malloc'ed buffer for index record */  char	*datbuf;/* malloc'ed buffer for data record*/  char	*name;	/* name mail was opened under */  off_t	idxoff;	/* offset in index file of index record */				/* actual key is at (idxoff + PTR_SZ + IDXLEN_SZ) */  size_t idxlen;/* length of index record */				/* excludes IDXLEN_SZ bytes at front of index record */				/* includes newline at end of index record */  off_t	datoff;	/* offset in data file of data record */  size_t datlen;/* length of data record */				/* includes newline at end */  off_t	ptrval;	/* contents of chain ptr in index record */  off_t	ptroff;	/* offset of chain ptr that points to this index record */  off_t	chainoff;/* offset of hash chain for this index record */  off_t	hashoff;/* offset in index file of hash table */  int	nhash;	/* current hash table size */  long	cnt_delok;	/* delete OK */  long	cnt_delerr;	/* delete error */  long	cnt_fetchok;/* fetch OK */  long	cnt_fetcherr;/* fetch error */  long	cnt_nextrec;/* nextrec */ /* long	cnt_stor1;	 store: mail_INSERT, no empty, appended */ /*long	cnt_stor2;	 store: mail_INSERT, found empty, reused */ /*long	cnt_stor3;	 store: mail_REPLACE, diff data len, appended */ /*long	cnt_stor4;	 store: mail_REPLACE, same data len, overwrote */ /*long	cnt_storerr; store error */} MAIL;typedef	unsigned long	hash_t;	/* hash values */			/* user-callable functions */MAIL	*mail_open(const char *, int, int);void	 mail_close(MAIL *);char	*mail_fetch(MAIL *, struct message *);int	 mail_store(MAIL *, struct message *);int	 mail_delete(MAIL *, const char *);void	 mail_rewind(MAIL *);char	*mail_nextrec(MAIL *, char *);void	 mail_stats(MAIL *);			/* internal functions */MAIL		*_mail_alloc(int);int		 _mail_checkfree(MAIL *);int		 _mail_dodelete(MAIL *);int		 _mail_emptykey(char *);int		 _mail_find(MAIL *, const char *, int);int		 _mail_findfree(MAIL *, int, int);int		 _mail_free(MAIL *);hash_t	 _mail_hash(MAIL *, const char *);char	*_mail_nextkey(MAIL *);char	*_mail_readdat(MAIL *);off_t	 _mail_readidx(MAIL *, off_t,int);off_t	 _mail_readptr(MAIL *, off_t);void	 _mail_writedat(MAIL *, const char *, off_t, int);void	 _mail_writeidx(MAIL *, struct message *, off_t, int, off_t);void	 _mail_writeptr(MAIL *, off_t, off_t);void     _mail_gethint(struct message*); #include	"interface.h"