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minix/commands/ibm/dosread.c
Ben Gras 9865aeaa79 Initial revision
2005-04-21 14:53:53 +00:00

1156 lines
29 KiB
C
Executable file
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/* dos{dir|read|write} - {list|read|write} MS-DOS disks Author: M. Huisjes */
/* Dosdir - list MS-DOS directories. doswrite - write stdin to DOS-file
* dosread - read DOS-file to stdout
*
* Author: Michiel Huisjes.
*
* Usage: dos... [-lra] drive [file/dir]
* l: Give long listing.
* r: List recursively.
* a: Set ASCII bit.
*/
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/times.h>
#include <unistd.h>
#define MAX_CLUSTER_SIZE 4096
#define MAX_ROOT_ENTRIES 512
#define FAT_START 512L /* After bootsector */
#define ROOTADDR (FAT_START + 2L * fat_size)
#define clus_add(cl_no) ((long) (((long) cl_no - 2L) \
* (long) cluster_size \
+ data_start \
))
struct dir_entry {
unsigned char d_name[8];
unsigned char d_ext[3];
unsigned char d_attribute;
unsigned char d_reserved[10];
unsigned short d_time;
unsigned short d_date;
unsigned short d_cluster;
unsigned long d_size;
};
typedef struct dir_entry DIRECTORY;
#define NOT_USED 0x00
#define ERASED 0xE5
#define DIR 0x2E
#define DIR_SIZE (sizeof (struct dir_entry))
#define SUB_DIR 0x10
#define NIL_DIR ((DIRECTORY *) 0)
#define LAST_CLUSTER12 0xFFF
#define LAST_CLUSTER 0xFFFF
#define FREE 0x000
#define BAD 0xFF0
#define BAD16 0xFFF0
typedef int BOOL;
#define TRUE 1
#define FALSE 0
#define NIL_PTR ((char *) 0)
#define DOS_TIME 315532800L /* 1970 - 1980 */
#define READ 0
#define WRITE 1
#define FIND 3
#define LABEL 4
#define ENTRY 5
#define find_entry(d, e, p) directory(d, e, FIND, p)
#define list_dir(d, e, f) (void) directory(d, e, f, NIL_PTR)
#define label() directory(root, root_entries, LABEL, NIL_PTR)
#define new_entry(d, e) directory(d, e, ENTRY, NIL_PTR)
#define is_dir(d) ((d)->d_attribute & SUB_DIR)
#define STD_OUT 1
char *cmnd;
static int disk; /* File descriptor for disk I/O */
static DIRECTORY root[MAX_ROOT_ENTRIES];
static DIRECTORY save_entry;
static char drive[] = "/dev/dosX";
#define DRIVE_NR (sizeof (drive) - 2)
static char null[MAX_CLUSTER_SIZE], *device = drive, path[128];
static long data_start;
static long mark; /* offset of directory entry to be written */
static unsigned short total_clusters, cluster_size, root_entries, sub_entries;
static unsigned long fat_size;
static BOOL Rflag, Lflag, Aflag, dos_read, dos_write, dos_dir, fat_16 = 0;
static BOOL big_endian;
/* maximum size of a cooked 12bit FAT. Also Size of 16bit FAT cache
* if not enough memory for whole FAT
*/
#define COOKED_SIZE 8192
/* raw FAT. Only used for 12bit FAT to make conversion easier
*/
static unsigned char *raw_fat;
/* Cooked FAT. May be only part of the FAT for 16 bit FATs
*/
static unsigned short *cooked_fat;
/* lowest and highest entry in fat cache
*/
static unsigned short fat_low = USHRT_MAX,
fat_high = 0;
static BOOL fat_dirty = FALSE;
static unsigned int cache_size;
/* Prototypes. */
_PROTOTYPE(void usage, (char *prog_name) );
_PROTOTYPE(unsigned c2u2, (unsigned char *ucarray) );
_PROTOTYPE(unsigned long c4u4, (unsigned char *ucarray) );
_PROTOTYPE(void determine, (void));
_PROTOTYPE(int main, (int argc, char *argv []));
_PROTOTYPE(DIRECTORY *directory, (DIRECTORY *dir, int entries, BOOL function, char *pathname) );
_PROTOTYPE(void extract, (DIRECTORY *entry) );
_PROTOTYPE(void make_file, (DIRECTORY *dir_ptr, int entries, char *name) );
_PROTOTYPE(void fill_date, (DIRECTORY *entry) );
_PROTOTYPE(char *make_name, (DIRECTORY *dir_ptr, int dir_fl) );
_PROTOTYPE(int fill, (char *buffer, size_t size) );
_PROTOTYPE(void xmodes, (int mode) );
_PROTOTYPE(void show, (DIRECTORY *dir_ptr, char *name) );
_PROTOTYPE(void free_blocks, (void));
_PROTOTYPE(DIRECTORY *read_cluster, (unsigned int cluster) );
_PROTOTYPE(unsigned short free_cluster, (BOOL leave_fl) );
_PROTOTYPE(void link_fat, (unsigned int cl_1, unsigned int cl_2) );
_PROTOTYPE(unsigned short next_cluster, (unsigned int cl_no) );
_PROTOTYPE(char *slash, (char *str) );
_PROTOTYPE(void add_path, (char *file, BOOL slash_fl) );
_PROTOTYPE(void disk_io, (BOOL op, unsigned long seek, void *address, unsigned bytes) );
_PROTOTYPE(void flush_fat, (void));
_PROTOTYPE(void read_fat, (unsigned int cl_no));
_PROTOTYPE(BOOL free_range, (unsigned short *first, unsigned short *last));
_PROTOTYPE(long lmin, (long a, long b));
void usage(prog_name)
register char *prog_name;
{
fprintf (stderr, "Usage: %s [%s\n", prog_name,
(dos_dir ? "-lr] drive [dir]" : "-a] drive file"));
exit(1);
}
unsigned c2u2(ucarray)
unsigned char *ucarray;
{
return ucarray[0] + (ucarray[1] << 8); /* parens vital */
}
unsigned long c4u4(ucarray)
unsigned char *ucarray;
{
return ucarray[0] + ((unsigned long) ucarray[1] << 8) +
((unsigned long) ucarray[2] << 16) +
((unsigned long) ucarray[3] << 24);
}
void determine()
{
struct dosboot {
unsigned char cjump[2]; /* unsigneds avoid bugs */
unsigned char nop;
unsigned char name[8];
unsigned char cbytepers[2]; /* don't use shorts, etc */
unsigned char secpclus; /* to avoid struct member */
unsigned char creservsec[2]; /* alignment and byte */
unsigned char fats; /* order bugs */
unsigned char cdirents[2];
unsigned char ctotsec[2];
unsigned char media;
unsigned char csecpfat[2];
unsigned char csecptrack[2];
unsigned char cheads[2];
unsigned char chiddensec[2];
unsigned char dos4hidd2[2];
unsigned char dos4totsec[4];
/* Char fill[476]; */
} boot;
unsigned short boot_magic; /* last of boot block */
unsigned bytepers, reservsec, dirents;
unsigned secpfat, secptrack, heads, hiddensec;
unsigned long totsec;
unsigned char fat_info, fat_check;
unsigned short endiantest = 1;
int errcount = 0;
big_endian = !(*(unsigned char *)&endiantest);
/* Read Bios-Parameterblock */
disk_io(READ, 0L, &boot, sizeof boot);
disk_io(READ, 0x1FEL, &boot_magic, sizeof boot_magic);
/* Convert some arrays */
bytepers = c2u2(boot.cbytepers);
reservsec = c2u2(boot.creservsec);
dirents = c2u2(boot.cdirents);
totsec = c2u2(boot.ctotsec);
if (totsec == 0) totsec = c4u4(boot.dos4totsec);
secpfat = c2u2(boot.csecpfat);
secptrack = c2u2(boot.csecptrack);
heads = c2u2(boot.cheads);
/* The `hidden sectors' are the sectors before the partition.
* The calculation here is probably wrong (I think the dos4hidd2
* bytes are the msbs), but that doesn't matter, since the
* value isn't used anyway
*/
hiddensec = c2u2(boot.chiddensec);
if (hiddensec == 0) hiddensec = c2u2 (boot.dos4hidd2);
/* Safety checking */
if (boot_magic != 0xAA55) {
fprintf (stderr, "%s: magic != 0xAA55\n", cmnd);
++errcount;
}
/* Check sectors per track instead of inadequate media byte */
if (secptrack < 15 && /* assume > 15 hard disk & wini OK */
#ifdef SECT10 /* BIOS modified for 10 sec/track */
secptrack != 10 &&
#endif
#ifdef SECT8 /* BIOS modified for 8 sec/track */
secptrack != 8 &&
#endif
secptrack != 9) {
fprintf (stderr, "%s: %d sectors per track not supported\n", cmnd, secptrack);
++errcount;
}
if (bytepers == 0) {
fprintf (stderr, "%s: bytes per sector == 0\n", cmnd);
++errcount;
}
if (boot.secpclus == 0) {
fprintf (stderr, "%s: sectors per cluster == 0\n", cmnd);
++errcount;
}
if (boot.fats != 2 && dos_write) {
fprintf (stderr, "%s: fats != 2\n", cmnd);
++errcount;
}
if (reservsec != 1) {
fprintf (stderr, "%s: reserved != 1\n", cmnd);
++errcount;
}
if (errcount != 0) {
fprintf (stderr, "%s: Can't handle disk\n", cmnd);
exit(2);
}
/* Calculate everything. */
if (boot.secpclus == 0) boot.secpclus = 1;
total_clusters =
(totsec - boot.fats * secpfat - reservsec -
dirents * 32L / bytepers ) / boot.secpclus + 2;
/* first 2 entries in FAT aren't used */
cluster_size = bytepers * boot.secpclus;
fat_size = (unsigned long) secpfat * (unsigned long) bytepers;
data_start = (long) bytepers + (long) boot.fats * fat_size
+ (long) dirents *32L;
root_entries = dirents;
sub_entries = boot.secpclus * bytepers / 32;
if (total_clusters > 4096) fat_16 = 1;
/* Further safety checking */
if (cluster_size > MAX_CLUSTER_SIZE) {
fprintf (stderr, "%s: cluster size too big\n", cmnd);
++errcount;
}
disk_io(READ, FAT_START, &fat_info, 1);
disk_io(READ, FAT_START + fat_size, &fat_check, 1);
if (fat_check != fat_info) {
fprintf (stderr, "%s: Disk type in FAT copy differs from disk type in FAT original.\n", cmnd);
++errcount;
}
if (errcount != 0) {
fprintf (stderr, "%s: Can't handle disk\n", cmnd);
exit(2);
}
}
int main(argc, argv)
int argc;
register char *argv[];
{
register char *arg_ptr = slash(argv[0]);
DIRECTORY *entry;
short idx = 1;
char dev_nr = '0';
cmnd = arg_ptr; /* needed for error messages */
if (!strcmp(arg_ptr, "dosdir"))
dos_dir = TRUE;
else if (!strcmp(arg_ptr, "dosread"))
dos_read = TRUE;
else if (!strcmp(arg_ptr, "doswrite"))
dos_write = TRUE;
else {
fprintf (stderr, "%s: Program should be named dosread, doswrite or dosdir.\n", cmnd);
exit(1);
}
if (argc == 1) usage(argv[0]);
if (argv[1][0] == '-') {
for (arg_ptr = &argv[1][1]; *arg_ptr; arg_ptr++) {
if (*arg_ptr == 'l' && dos_dir) {
Lflag = TRUE;
} else if (*arg_ptr == 'r' && dos_dir) {
Rflag = TRUE;
} else if (*arg_ptr == 'a' && !dos_dir) {
assert ('\n' == 10);
assert ('\r' == 13);
Aflag = TRUE;
} else {
usage(argv[0]);
}
}
idx++;
}
if (idx == argc) usage(argv[0]);
if (strlen(argv[idx]) > 1) {
device = argv[idx++];
/* If the device does not contain a / we assume that it
* is the name of a device in /dev. Instead of prepending
* /dev/ we try to chdir there.
*/
if (strchr(device, '/') == NULL && chdir("/dev") < 0) {
perror("/dev");
exit(1);
}
} else {
if ((dev_nr = toupper (*argv[idx++])) < 'A' || dev_nr > 'Z')
usage(argv[0]);
device[DRIVE_NR] = dev_nr;
}
if ((disk = open(device, dos_write ? O_RDWR : O_RDONLY)) < 0) {
fprintf (stderr, "%s: cannot open %s: %s\n",
cmnd, device, strerror (errno));
exit(1);
}
determine();
disk_io(READ, ROOTADDR, root, DIR_SIZE * root_entries);
if (dos_dir && Lflag) {
entry = label();
printf ("Volume in drive %c ", dev_nr);
if (entry == NIL_DIR)
printf("has no label.\n\n");
else
printf ("is %.11s\n\n", entry->d_name);
}
if (argv[idx] == NIL_PTR) {
if (!dos_dir) usage(argv[0]);
if (Lflag) printf ("Root directory:\n");
list_dir(root, root_entries, FALSE);
if (Lflag) free_blocks();
fflush (stdout);
exit(0);
}
for (arg_ptr = argv[idx]; *arg_ptr; arg_ptr++)
if (*arg_ptr == '\\') *arg_ptr = '/';
else *arg_ptr = toupper (*arg_ptr);
if (*--arg_ptr == '/') *arg_ptr = '\0'; /* skip trailing '/' */
add_path(argv[idx], FALSE);
add_path("/", FALSE);
if (dos_dir && Lflag) printf ( "Directory %s:\n", path);
entry = find_entry(root, root_entries, argv[idx]);
if (dos_dir) {
list_dir(entry, sub_entries, FALSE);
if (Lflag) free_blocks();
} else if (dos_read)
extract(entry);
else {
if (entry != NIL_DIR) {
fflush (stdout);
if (is_dir(entry))
fprintf (stderr, "%s: %s is a directory.\n", cmnd, path);
else
fprintf (stderr, "%s: %s already exists.\n", cmnd, argv[idx]);
exit(1);
}
add_path(NIL_PTR, TRUE);
if (*path) make_file(find_entry(root, root_entries, path),
sub_entries, slash(argv[idx]));
else
make_file(root, root_entries, argv[idx]);
}
(void) close(disk);
fflush (stdout);
exit(0);
return(0);
}
/* General directory search routine.
*
* dir:
* Points to one or more directory entries
* entries:
* number of entries
* if entries == root_entries, dir points to the entire
* root directory. Otherwise it points to a single directory
* entry describing the directory to be searched.
*
* function:
* FIND ... find pathname relative to directory dir.
* LABEL ... find first label entry in dir.
* ENTRY ... create a new empty entry.
* FALSE ... list directory
*
* pathname:
* name of the file to be found or directory to be listed.
* must be in upper case, pathname components must be
* separated by slashes, but can be longer than than
* 8+3 characters (The rest is ignored).
*/
DIRECTORY *directory(dir, entries, function, pathname)
DIRECTORY *dir;
int entries;
int function;
register char *pathname;
{
register DIRECTORY *dir_ptr = dir;
DIRECTORY *mem = NIL_DIR;
unsigned short cl_no = dir->d_cluster;
unsigned short type, last = 0;
char file_name[14];
char *name;
int i = 0;
if (function == FIND) {
while (*pathname != '/' && *pathname != '.' && *pathname &&
i < 8) {
file_name[i++] = *pathname++;
}
if (*pathname == '.') {
int j = 0;
file_name[i++] = *pathname++;
while (*pathname != '/' && *pathname != '.' && *pathname &&
j++ < 3) {
file_name[i++] = *pathname++;
}
}
while (*pathname != '/' && *pathname) pathname++;
file_name[i] = '\0';
}
do {
if (entries != root_entries) {
mem = dir_ptr = read_cluster(cl_no);
last = cl_no;
cl_no = next_cluster(cl_no);
}
for (i = 0; i < entries; i++, dir_ptr++) {
type = dir_ptr->d_name[0] & 0x0FF;
if (function == ENTRY) {
if (type == NOT_USED || type == ERASED) {
if (!mem)
mark = ROOTADDR + (long) i *(long) DIR_SIZE;
else
mark = clus_add(last) + (long) i *(long) DIR_SIZE;
return dir_ptr;
}
continue;
}
if (type == NOT_USED) break;
if (dir_ptr->d_attribute & 0x08) {
if (function == LABEL) return dir_ptr;
continue;
}
if (type == DIR || type == ERASED || function == LABEL)
continue;
type = is_dir(dir_ptr);
name = make_name(dir_ptr,
(function == FIND) ? FALSE : type);
if (function == FIND) {
if (strcmp(file_name, name) != 0) continue;
if (!type) {
if (dos_dir || *pathname) {
fflush (stdout);
fprintf (stderr, "%s: Not a directory: %s\n", cmnd, file_name);
exit(1);
}
} else if (*pathname == '\0' && dos_read) {
fflush (stdout);
fprintf (stderr, "%s: %s is a directory.\n", cmnd, path);
exit(1);
}
if (*pathname) {
dir_ptr = find_entry(dir_ptr,
sub_entries, pathname + 1);
}
if (mem) {
if (dir_ptr) {
memcpy((char *)&save_entry, (char *)dir_ptr, DIR_SIZE);
dir_ptr = &save_entry;
}
free( (void *) mem);
}
return dir_ptr;
} else {
if (function == FALSE) {
show(dir_ptr, name);
} else if (type) { /* Recursive */
printf ( "Directory %s%s:\n", path, name);
add_path(name, FALSE);
list_dir(dir_ptr, sub_entries, FALSE);
add_path(NIL_PTR, FALSE);
}
}
}
if (mem) free( (void *) mem);
} while (cl_no != LAST_CLUSTER && mem);
switch (function) {
case FIND:
if (dos_write && *pathname == '\0') return NIL_DIR;
fflush (stdout);
fprintf (stderr, "%s: Cannot find `%s'.\n", cmnd, file_name);
exit(1);
case LABEL:
return NIL_DIR;
case ENTRY:
if (!mem) {
fflush (stdout);
fprintf (stderr, "%s: No entries left in root directory.\n", cmnd);
exit(1);
}
cl_no = free_cluster(TRUE);
link_fat(last, cl_no);
link_fat(cl_no, LAST_CLUSTER);
disk_io(WRITE, clus_add(cl_no), null, cluster_size);
return new_entry(dir, entries);
case FALSE:
if (Rflag) {
printf ("\n");
list_dir(dir, entries, TRUE);
}
}
return NULL;
}
void extract(entry)
register DIRECTORY *entry;
{
register unsigned short cl_no = entry->d_cluster;
char buffer[MAX_CLUSTER_SIZE];
int rest, i;
if (entry->d_size == 0) /* Empty file */
return;
do {
disk_io(READ, clus_add(cl_no), buffer, cluster_size);
rest = (entry->d_size > (long) cluster_size) ? cluster_size : (short) entry->d_size;
if (Aflag) {
for (i = 0; i < rest; i ++) {
if (buffer [i] != '\r') putchar (buffer [i]);
}
if (ferror (stdout)) {
fprintf (stderr, "%s: cannot write to stdout: %s\n",
cmnd, strerror (errno));
exit (1);
}
} else {
if (fwrite (buffer, 1, rest, stdout) != rest) {
fprintf (stderr, "%s: cannot write to stdout: %s\n",
cmnd, strerror (errno));
exit (1);
}
}
entry->d_size -= (long) rest;
cl_no = next_cluster(cl_no);
if (cl_no == BAD16) {
fflush (stdout);
fprintf (stderr, "%s: reserved cluster value %x encountered.\n",
cmnd, cl_no);
exit (1);
}
} while (entry->d_size && cl_no != LAST_CLUSTER);
if (cl_no != LAST_CLUSTER)
fprintf (stderr, "%s: Too many clusters allocated for file.\n", cmnd);
else if (entry->d_size != 0)
fprintf (stderr, "%s: Premature EOF: %ld bytes left.\n", cmnd,
entry->d_size);
}
/* Minimum of two long values
*/
long lmin (a, b)
long a, b;
{
if (a < b) return a;
else return b;
}
void make_file(dir_ptr, entries, name)
DIRECTORY *dir_ptr;
int entries;
char *name;
{
register DIRECTORY *entry = new_entry(dir_ptr, entries);
register char *ptr;
char buffer[MAX_CLUSTER_SIZE];
unsigned short cl_no = 0;
int i, r;
long size = 0L;
unsigned short first_cluster, last_cluster;
long chunk;
memset (&entry->d_name[0], ' ', 11); /* clear entry */
for (i = 0, ptr = name; i < 8 && *ptr != '.' && *ptr; i++)
entry->d_name[i] = *ptr++;
while (*ptr != '.' && *ptr) ptr++;
if (*ptr == '.') ptr++;
for (i = 0; i < 3 && *ptr != '.' && *ptr; i++) entry->d_ext[i] = *ptr++;
for (i = 0; i < 10; i++) entry->d_reserved[i] = '\0';
entry->d_attribute = '\0';
entry->d_cluster = 0;
while (free_range (&first_cluster, &last_cluster)) {
do {
unsigned short nr_clus;
chunk = lmin ((long) (last_cluster - first_cluster + 1) *
cluster_size,
(long) MAX_CLUSTER_SIZE);
r = fill(buffer, chunk);
if (r == 0) goto done;
nr_clus = (r + cluster_size - 1) / cluster_size;
disk_io(WRITE, clus_add(first_cluster), buffer, r);
for (i = 0; i < nr_clus; i ++) {
if (entry->d_cluster == 0)
cl_no = entry->d_cluster = first_cluster;
else {
link_fat(cl_no, first_cluster);
cl_no = first_cluster;
}
first_cluster ++;
}
size += r;
} while (first_cluster <= last_cluster);
}
fprintf (stderr, "%s: disk full. File truncated\n", cmnd);
done:
if (entry->d_cluster != 0) link_fat(cl_no, LAST_CLUSTER);
entry->d_size = size;
fill_date(entry);
disk_io(WRITE, mark, entry, DIR_SIZE);
if (fat_dirty) flush_fat ();
}
#define SEC_MIN 60L
#define SEC_HOUR (60L * SEC_MIN)
#define SEC_DAY (24L * SEC_HOUR)
#define SEC_YEAR (365L * SEC_DAY)
#define SEC_LYEAR (366L * SEC_DAY)
unsigned short mon_len[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
void fill_date(entry)
DIRECTORY *entry;
{
register long cur_time = time((long *) 0) - DOS_TIME;
unsigned short year = 0, month = 1, day, hour, minutes, seconds;
int i;
long tmp;
if (cur_time < 0) /* Date not set on booting ... */
cur_time = 0;
for (;;) {
tmp = (year % 4 == 0) ? SEC_LYEAR : SEC_YEAR;
if (cur_time < tmp) break;
cur_time -= tmp;
year++;
}
day = (unsigned short) (cur_time / SEC_DAY);
cur_time -= (long) day *SEC_DAY;
hour = (unsigned short) (cur_time / SEC_HOUR);
cur_time -= (long) hour *SEC_HOUR;
minutes = (unsigned short) (cur_time / SEC_MIN);
cur_time -= (long) minutes *SEC_MIN;
seconds = (unsigned short) cur_time;
mon_len[1] = (year % 4 == 0) ? 29 : 28;
i = 0;
while (day >= mon_len[i]) {
month++;
day -= mon_len[i++];
}
day++;
entry->d_date = (year << 9) | (month << 5) | day;
entry->d_time = (hour << 11) | (minutes << 5) | seconds;
}
char *make_name(dir_ptr, dir_fl)
register DIRECTORY *dir_ptr;
short dir_fl;
{
static char name_buf[14];
register char *ptr = name_buf;
short i;
for (i = 0; i < 8; i++) *ptr++ = dir_ptr->d_name[i];
while (*--ptr == ' ');
assert (ptr >= name_buf);
ptr++;
if (dir_ptr->d_ext[0] != ' ') {
*ptr++ = '.';
for (i = 0; i < 3; i++) *ptr++ = dir_ptr->d_ext[i];
while (*--ptr == ' ');
ptr++;
}
if (dir_fl) *ptr++ = '/';
*ptr = '\0';
return name_buf;
}
int fill(buffer, size)
register char *buffer;
size_t size;
{
static BOOL nl_mark = FALSE;
char *last = &buffer[size];
char *begin = buffer;
register int c;
while (buffer < last) {
if (nl_mark) {
*buffer ++ = '\n';
nl_mark = FALSE;
} else {
c = getchar();
if (c == EOF) break;
if (Aflag && c == '\n') {
*buffer ++ = '\r';
nl_mark = TRUE;
} else {
*buffer++ = c;
}
}
}
return (buffer - begin);
}
#define HOUR 0xF800 /* Upper 5 bits */
#define MIN 0x07E0 /* Middle 6 bits */
#define YEAR 0xFE00 /* Upper 7 bits */
#define MONTH 0x01E0 /* Mid 4 bits */
#define DAY 0x01F /* Lowest 5 bits */
char *month[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
void xmodes(mode)
int mode;
{
printf ( "\t%c%c%c%c%c", (mode & SUB_DIR) ? 'd' : '-',
(mode & 02) ? 'h' : '-', (mode & 04) ? 's' : '-',
(mode & 01) ? '-' : 'w', (mode & 0x20) ? 'a' : '-');
}
void show(dir_ptr, name)
DIRECTORY *dir_ptr;
char *name;
{
register unsigned short e_date = dir_ptr->d_date;
register unsigned short e_time = dir_ptr->d_time;
unsigned short next;
char bname[20];
short i = 0;
while (*name && *name != '/') bname[i++] = *name++;
bname[i] = '\0';
if (!Lflag) {
printf ( "%s\n", bname);
return;
}
xmodes( (int) dir_ptr->d_attribute);
printf ( "\t%s%s", bname, strlen(bname) < 8 ? "\t\t" : "\t");
i = 1;
if (is_dir(dir_ptr)) {
next = dir_ptr->d_cluster;
while ((next = next_cluster(next)) != LAST_CLUSTER) i++;
printf ("%8ld", (long) i * (long) cluster_size);
} else
printf ("%8ld", dir_ptr->d_size);
printf (" %02d:%02d %2d %s %d\n", ((e_time & HOUR) >> 11),
((e_time & MIN) >> 5), (e_date & DAY),
month[((e_date & MONTH) >> 5) - 1], ((e_date & YEAR) >> 9) + 1980);
}
void free_blocks()
{
register unsigned short cl_no;
long nr_free = 0;
long nr_bad = 0;
for (cl_no = 2; cl_no < total_clusters; cl_no++) {
switch (next_cluster(cl_no)) {
case FREE: nr_free++; break;
case BAD16: nr_bad++; break;
}
}
printf ("Free space: %ld bytes.\n", nr_free * (long) cluster_size);
if (nr_bad != 0)
printf ("Bad sectors: %ld bytes.\n", nr_bad * (long) cluster_size);
}
DIRECTORY *read_cluster(cluster)
register unsigned int cluster;
{
register DIRECTORY *sub_dir;
if ((sub_dir = malloc(cluster_size)) == NULL) {
fprintf (stderr, "%s: Cannot set break!\n", cmnd);
exit(1);
}
disk_io(READ, clus_add(cluster), sub_dir, cluster_size);
return sub_dir;
}
static unsigned short cl_index = 2;
/* find a range of consecutive free clusters. Return TRUE if found
* and return the first and last cluster in the |*first| and |*last|.
* If no free clusters are left, return FALSE.
*
* Warning: Assumes that all of the range is used before the next call
* to free_range or free_cluster.
*/
BOOL free_range (first, last)
unsigned short *first, *last;
{
while (cl_index < total_clusters && next_cluster(cl_index) != FREE)
cl_index++;
if (cl_index >= total_clusters) return FALSE;
*first = cl_index;
while (cl_index < total_clusters && next_cluster(cl_index) == FREE)
cl_index++;
*last = cl_index - 1;
return TRUE;
}
/* find a free cluster.
* Return the number of the free cluster or a number > |total_clusters|
* if none is found.
* If |leave_fl| is TRUE, the the program will be terminated if
* no free cluster can be found
*
* Warning: Assumes that the cluster is used before the next call
* to free_range or free_cluster.
*/
unsigned short free_cluster(leave_fl)
BOOL leave_fl;
{
while (cl_index < total_clusters && next_cluster(cl_index) != FREE)
cl_index++;
if (leave_fl && cl_index >= total_clusters) {
fprintf (stderr, "%s: Diskette full. File not added.\n", cmnd);
exit(1);
}
return cl_index++;
}
/* read a portion of the fat containing |cl_no| into the cache
*/
void read_fat (cl_no)
unsigned int cl_no;
{
if (!cooked_fat) {
/* Read the fat for the first time. We have to allocate all the
* buffers
*/
if (fat_16) {
/* FAT consists of little endian shorts. Easy to convert
*/
if ((cooked_fat = malloc (fat_size)) == NULL) {
/* Oops, FAT doesn't fit into memory, just read
* a chunk
*/
if ((cooked_fat = malloc (COOKED_SIZE)) == NULL) {
fprintf (stderr, "%s: not enough memory for FAT cache. Use chmem\n",
cmnd);
exit (1);
}
cache_size = COOKED_SIZE / 2;
} else {
cache_size = fat_size / 2;
}
} else {
/* 12 bit FAT. Difficult encoding, but small. Keep
* both raw FAT and cooked version in memory.
*/
if ((cooked_fat = malloc (total_clusters * sizeof (short))) == NULL ||
(raw_fat = malloc (fat_size)) == NULL) {
fprintf (stderr, "%s: not enough memory for FAT cache. Use chmem\n",
cmnd);
exit (1);
}
cache_size = total_clusters;
}
}
fat_low = cl_no / cache_size * cache_size;
fat_high = fat_low + cache_size - 1;
if (!fat_16) {
unsigned short *cp;
unsigned char *rp;
unsigned short i;
disk_io (READ, FAT_START, raw_fat, fat_size);
for (rp = raw_fat, cp = cooked_fat, i = 0;
i < cache_size;
rp += 3, i += 2) {
*cp = *rp + ((*(rp + 1) & 0x0f) << 8);
if (*cp == BAD) *cp = BAD16;
else if (*cp == LAST_CLUSTER12) *cp = LAST_CLUSTER;
cp ++;
*cp = ((*(rp + 1) & 0xf0) >> 4) + (*(rp + 2) << 4);
if (*cp == BAD) *cp = BAD16;
else if (*cp == LAST_CLUSTER12) *cp = LAST_CLUSTER;
cp ++;
}
} else {
assert (sizeof (short) == 2);
assert (CHAR_BIT == 8); /* just in case */
disk_io (READ, FAT_START + fat_low * 2, (void *)cooked_fat, cache_size * 2);
if (big_endian) {
unsigned short *cp;
unsigned char *rp;
unsigned short i;
for (i = 0, rp = (unsigned char *)cooked_fat /* sic */, cp = cooked_fat;
i < cache_size;
rp += 2, cp ++, i ++) {
*cp = c2u2 (rp);
}
}
}
}
/* flush the fat cache out to disk
*/
void flush_fat ()
{
if (fat_16) {
if (big_endian) {
unsigned short *cp;
unsigned char *rp;
unsigned short i;
for (i = 0, rp = (unsigned char *)cooked_fat /* sic */, cp = cooked_fat;
i < cache_size;
rp += 2, cp ++, i ++) {
*rp = *cp;
*(rp + 1) = *cp >> 8;
}
}
disk_io (WRITE, FAT_START + fat_low * 2, (void *)cooked_fat, cache_size * 2);
disk_io (WRITE, FAT_START + fat_size + fat_low * 2, (void *)cooked_fat, cache_size * 2);
} else {
unsigned short *cp;
unsigned char *rp;
unsigned short i;
for (rp = raw_fat, cp = cooked_fat, i = 0;
i < cache_size;
rp += 3, cp += 2, i += 2) {
*rp = *cp;
*(rp + 1) = ((*cp & 0xf00) >> 8) |
((*(cp + 1) & 0x00f) << 4);
*(rp + 2) = ((*(cp + 1) & 0xff0) >> 4);
}
disk_io (WRITE, FAT_START, raw_fat, fat_size);
disk_io (WRITE, FAT_START + fat_size, raw_fat, fat_size);
}
}
/* make cl_2 the successor of cl_1
*/
void link_fat(cl_1, cl_2)
unsigned int cl_1;
unsigned int cl_2;
{
if (cl_1 < fat_low || cl_1 > fat_high) {
if (fat_dirty) flush_fat ();
read_fat (cl_1);
}
cooked_fat [cl_1 - fat_low] = cl_2;
fat_dirty = TRUE;
}
unsigned short next_cluster(cl_no)
register unsigned int cl_no;
{
if (cl_no < fat_low || cl_no > fat_high) {
if (fat_dirty) flush_fat ();
read_fat (cl_no);
}
return cooked_fat [cl_no - fat_low];
}
char *slash(str)
register char *str;
{
register char *result = str;
while (*str)
if (*str++ == '/') result = str;
return result;
}
void add_path(file, slash_fl)
char *file;
BOOL slash_fl;
{
register char *ptr = path;
while (*ptr) ptr++;
if (file == NIL_PTR) {
if (ptr != path) ptr--;
if (ptr != path) do {
ptr--;
} while (*ptr != '/' && ptr != path);
if (ptr != path && !slash_fl) *ptr++ = '/';
*ptr = '\0';
} else
strcpy (ptr, file);
}
void disk_io(op, seek, address, bytes)
register BOOL op;
unsigned long seek;
void *address;
register unsigned bytes;
{
unsigned int r;
if (lseek(disk, seek, SEEK_SET) < 0L) {
fflush (stdout);
fprintf (stderr, "%s: Bad lseek: %s\n", cmnd, strerror (errno));
exit(1);
}
if (op == READ)
r = read(disk, (char *) address, bytes);
else {
r = write(disk, (char *) address, bytes);
}
if (r != bytes) {
fprintf (stderr, "%s: read error: %s\n", cmnd, strerror (errno));
exit (1);
}
}
char dosread_c_rcs_id [] =
"$Id$";
/* $Log$
* Revision 1.1 2005/04/21 14:54:57 beng
* Initial revision
*
/* Revision 1.1.1.1 2005/04/20 13:33:07 beng
/* Initial import of minix 2.0.4
/*
* Revision 1.8 1994/05/14 21:53:08 hjp
* filenames with more than 3 characters and extension work again.
* removed debugging stuff and b_copy.
*
* Revision 1.7 1994/04/09 03:09:01 hjp
* (posted to comp.os.minix)
* merged branch 1.5.387 with stem.
* changed treatment of drive parameter
*
* Revision 1.5.387.9 1994/04/09 02:07:51 hjp
* Disk full no longer produces lost clusters but a truncated file.
* Truncated file names to 8+3 before comparisons to avoid duplicate
* files and filenames containing dots in the extension.
* Replaced sbrk and brk by malloc and free (mixing brk and malloc causes
* heap corruption which sometimes lead to core dumps. It may also have
* been the cause of data corruption Kees reported).
* Made global variables static and removed some unused ones.
* Error messages now contain program name.
*
* Revision 1.5.387.8 1993/11/13 00:38:45 hjp
* Posted to comp.os.minix and included in Minix-386vm 1.6.25.1.
* Speed optimizations for 1.44 MB disks.
* Replaced lowlevel I/O by stdio.
* Simplified -a: Now only removes resp. adds CRs
* Cleaned up.
*
* Revision 1.5.387.1 1993/01/15 19:32:29 ast
* Released with 1.6.24b
*/
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