/******* MUD MAIL SYSTEM HEADER FILE *************************
 ***     written by Rasmussen (jelson@server.cs.jhu.edu)   ***
 ****   compliments of CircleMUD (circle.cs.jhu.edu 4000) ****
 ************************************************************/

/* INSTALLATION INSTRUCTIONS in MAIL.C */

/* You can modify the following constants to fit your own MUD.  */

/* command numbers of the "mail", "check", and "receive" commands
   in your interpreter. */
#define CMD_MAIL	247
#define CMD_CHECK	248
#define CMD_RECEIVE	249

/* minimum level a player must be to send mail	*/
#define MIN_MAIL_LEVEL 2

/* # of gold coins required to send mail	*/
#define STAMP_PRICE 150

/* Maximum size of mail in bytes (arbitrary)	*/
#define MAX_MAIL_SIZE 4000

/* Max size of player names			*/
#define NAME_SIZE  15

/* size of mail file allocation blocks		*/
#define BLOCK_SIZE 100

/* NOTE:  Make sure that your block size is	*/
/*  big enough -- if not, HEADER_BLOCK_DATASIZE	*/
/*  will end up negative.  Check the define	*/
/*  below to make sure it is >0 when choosing	*/
/*  NAME_SIZE and BLOCK_SIZE values.  100 is	*/
/*  a nice round number for BLOCK_SIZE.		*/
/*    The mail system will always allocate disk */
/*  space in chunks of size BLOCK_SIZE.		*/

/* USER CHANGABLE DEFINES ABOVE **
***************************************************************************
**   DONT TOUCH DEFINES BELOW   */

int	scan_file(void);
int	has_mail(char *recipient);
void	store_mail(char *to, char *from, char *message_pointer);
char	*read_delete(char *recipient, char *recipient_formatted);

#define INT_SIZE  sizeof(int)
#define CHAR_SIZE sizeof(char)
#define LONG_SIZE sizeof(long)

#define HEADER_BLOCK_DATASIZE (BLOCK_SIZE-1-((CHAR_SIZE*(NAME_SIZE+1)*2)+(3*LONG_SIZE)))
/* size of the data part of a header block */

#define DATA_BLOCK_DATASIZE (BLOCK_SIZE-LONG_SIZE-1)
/* size of the data part of a data block */

/* note that an extra space is allowed in all string fields for the
   terminating null character.  */

#define HEADER_BLOCK  -1
#define LAST_BLOCK    -2
#define DELETED_BLOCK -3

struct header_block_type_d {
   long	block_type;  	/* is this a header block or data block? */
   long	next_block;	/* if header block, link to next block   */
   /* note: next_block is part of header_blk*/
   /* in a data block; we can't combine them*/
   /* here because we have to be able to    */
   /* differentiate a data block from a     */
   /* header block when booting mail system */
   char	from[NAME_SIZE+1]; /* who is this letter from?		 */
   char	to[NAME_SIZE+1];/* who is this letter to?		 */
   long	mail_time;	/* when was the letter mailed?		 */
   char	txt[HEADER_BLOCK_DATASIZE+1]; /* the actual text	*/
};

struct data_block_type_d {
   long	block_type;  	/* -1 if header block, -2 if last data block
      				   in mail, otherwise a link to the next */
   char	txt[DATA_BLOCK_DATASIZE+1]; /* the actual text		 */
};

typedef struct header_block_type_d header_block_type;
typedef struct data_block_type_d data_block_type;

struct position_list_type_d {
   long	position;
   struct position_list_type_d *next;
};

typedef struct position_list_type_d position_list_type;

struct mail_index_type_d {
   char	recipient[NAME_SIZE+1]; /* who the mail is for */
   position_list_type   	 * list_start;  /* list of mail positions    */
   struct mail_index_type_d *next;
};

typedef struct mail_index_type_d mail_index_type;