jrb@wdl1.UUCP (John R Blaker) (02/17/84)
/*===========================================================================*
* == R T 1 1 . H == *
*===========================================================================*
* John R Blaker -- Ford Aerospace & Communications Corporation -- Oct. 1982 *
*===========================================================================*
* This file contains a number of global definitions *
*===========================================================================*
*/
/*
* Include file
*/
#include <stdio.h> /* Standard I/O headers */
/*
* Values for boolean flags
*/
#define TRUE 1
#define FALSE 0
#define ZERO 0 /* For DRIVE flag */
#define ONE 1 /* For DRIVE flag */
/*
* Boolean flags
*/
int TRACE; /* Tracing turned on if TRUE */
int VERBOSE; /* Verbose mode turned on if TRUE */
int EXTRACT; /* Extract files from disc if TRUE */
int WRITE; /* Write files on disc if TRUE */
int CREATE; /* Create a new disc if TRUE */
int LIST; /* List disc directory if TRUE */
int DRIVE; /* Select drive 0 if ZERO and 1 if ONE */
/*
* Holds list of filenames
* The size is large and arbitrary
*/
char *FILES[512];
/*
* Number of files on command line
*/
int COUNT;
/*
* Structures for directories and
* directory entries
*/
typedef struct dir_header {
unsigned dh_segs; /* Total segments in directory */
unsigned dh_next; /* Segment number of next segment */
unsigned dh_highest; /* Segment number of last segment */
unsigned dh_extra; /* Extra bytes per entry (zero) */
unsigned dh_addr; /* Start of data referred to */
} DIR_HEADER;
typedef struct dir_entry {
unsigned de_status; /* Status word */
unsigned de_fln1; /* Chars 1-3 of filename */
unsigned de_fln2; /* Chars 4-6 of filename */
unsigned de_type; /* File type */
unsigned de_length; /* Total file length */
unsigned de_unused; /* Unused */
unsigned de_date; /* File creation date */
} DIR_ENTRY;
/*
* Valid statuses for de_status field
*/
#define ST_TENT 0000400 /* File is tentative */
#define ST_EMPT 0001000 /* Empty area defined */
#define ST_PERM 0002000 /* File is permanent */
#define ST_PROT 0102000 /* File is protected from being overwritten */
#define ST_EOSG 0004000 /* End of segment */
/*
* Structure for a directory segment
*/
typedef struct dir_segmnt {
DIR_HEADER ds_header; /* Segment header */
DIR_ENTRY ds_direct[72]; /* Entries (larger than max used) */
} DIR_SEGMNT;
/*
* Structure of an entry in the in-memory directory. The in-memory
* directory is implemented as a linked list with nodes as
* follows:
*/
typedef struct mem_dir {
char md_name[15]; /* Name of file */
unsigned md_addr; /* Block number of start of file */
unsigned md_size; /* Size of file (in bytes) */
unsigned md_date; /* File creation date */
struct mem_dir *md_next; /* Pointer to next node */
} MEM_DIR;
MEM_DIR *dir_header; /* Pointer to the head of the directory */
/*
* Useful definitions
*/
#define BLOCKSIZE 512 /* Size of a block */
#define SEGSIZE (2 * BLOCKSIZE) /* Size of a segment */
#define IO_RD 0 /* Read only open() mode */
#define IO_WT 1 /* Write only open() mode */
#define IO_RW 2 /* Read/write open() mode */