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atr.c
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/* Atari diskette access
* Copyright
* (C) 2011 Joseph H. Allen
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 1, or (at your option) any later version.
*
* It is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this software; see the file COPYING. If not, write to the Free Software Foundation,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Atari disk access */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Disks: .ATR file has a 16 byte header, then data:
*
* DOS 2.0S single density (40 tracks, 18 sectors, 128 byte sectors): 92160 bytes
*
* Drive numbers sectors 1..720 but allocation map numbers sectors
* 0..719. Since there is no sector 0, it's always marked in-use in the
* allocation map. Sector 720 can not be allocated since there is no
* allocation map bit for it.
*
* Boot sectors = 1..3. These are allocated and written on newly
* formatted disks even if there is no dos.sys.
*
* VTOC sector = 360 (0x168)
*
* Directory sectors = 361..368 (0x169..0x170)
*
* Out of reach sector = 720 (no bitmap bit for it)
*
* VTOC:
* 0: DOS version code: 2 for Atari DOS 2.0
* 1..2: Initial number of free sectors in allocation map. Excludes pre-allocated
* sectors including sector 0, boot, VTOC, and directory. Should be 707.
*
* 3..4: Current number of free sectors 0..707
* 5..9: unused
* 10..99: allocation bitmap for sectors 0..719. 0 means in use.
* 100-127: unused
*
* Directory entry: (8 entries per 128 byte sector)
* 0: flag byte (0 means unused, 0x42 means in use)
* bit 0: opened for output
* bit 1: created by DOS 2
* bit 5: file locked
* bit 6: this entry in use
* bit 7: this entry has been deleted
* 1..2: number of sectors in file
* 3..4: starting sector number
* 5..12: 8 byte file name
* 13..15: 3 byte extension
*
* Data sectors:
* 0..124 Contain data
* 125 File number in upper 6 bits. Upper 2 bits of next
* sector number in lower two bits.
* 126 Lower 8 bits of next sector number.
* 127 Number of data bytes in sector: Usually 125 except for last sector
*
* DOS 2.5 Enhanced density (40 tracks, 26 sectors, 128 byte sectors): 133120 bytes
*
* Drive numbers sectors 1..1040 but allocation map numbers sectors
* 0..1023. Since there is no sector 0, it's always marked in-use in the
* allocation map. Out of reach sector 1024 is used for VTOC2. Sectors
* 1025..1040 not used because next sector number is only 10 bits.
*
* Note: on new disks, DOS 2.5 allocates sector 720 even though it is not used
* for anything. I think this is to enhance backward compatibility with DOS 2.0s
* (where some programs might use sector 720, knowing that the OS will not normally use
* use it).
*
* Boot sectors = 1..3. These are allocated and written on newly formatted disks
* even if there is no dos.sys written.
*
* VTOC sector = 360 (0x168)
*
* Directory sectors = 361..368
*
* VTOC2 = 1024 (has more bitmap bits)
*
* Out of reach sectors = 1024..1040 (because next sector number is 10 bits).
*
* VTOC: Same as 2.0s, except:
*
* Initial number of free sectors in allocation map. Excludes pre-allocated
* sector 0, boot, VTOC, directory and sector 720. Should be 1010 but 1011
* is probably OK as well (for a format without pre-allocating 720).
*
* Current number of free sectors below 720. Should be 707 on a new disk since
* sector 0, boot sectors, VTOC and directory sectors are pre-allocated.
*
* VTOC2:
* 0..83: Repeat VTOC bitmap for sectors 48..719 (write these, do not read them)
* 84..121: Bitmap for sectors 720..1023
* 122..123: Current number of free sectors above sector 719. Should be 303 on a new
* disk because sector 720 is pre-allocated.
* 124..127: Unused.
*
* Directory: same as DOS 2.0s
*
* Data sectors: same as DOS 2.0s
*
* DOS 2.0d Double density (40 tracks, 18 sectors, 256 byte sectors):
* 184320 - 384 = 183936 bytes (subtract 384 because first three sectors have 128 bytes).
*
* Sector numbering: Same as DOS 2.0s
*
* Boot sectors = 1..3 Only first 128 bytes of each used even though on the disk they
* are 256 bytes. Usually these sectors use 128 bytes in the .ATR file, but not
* always.
*
* VTOC sector = 360 (0x168)
*
* Directory sectors = 361..368 (0x169..0x170)
*
* Out of reach sector = 720 (out of reach because no bitmap bit for it)
*
* VTOC: Same as DOS 2.0s, except balance of 256 byte sector is left unused.
*
* Directory: Same as DOS 2.0s. Note that each directory sector has 8
* entries even though 16 would fit. Bytes 128 - 255 of each directory sector
* are left unused.
*
* Data sectors:
* 0..252 Contain data
* 253 File number in upper 6 bits. Upper 2 bits of next
* sector number in lower two bits.
* 254 Lower 8 bits of next sector number.
* 255 Number of data bytes in sector: Usually 253 except for last sector
*/
/* Error status */
int status = 0;
/* Set if fixes were made */
int fixes = 0;
/* Sector size in bytes */
#define SECTOR_SIZE 128
#define DD_SECTOR_SIZE 256
/* True if disk is double-density */
int disk_dd = 0;
int sector_size = SECTOR_SIZE;
/* Largest reachable sector + 1 */
int disk_size = 720;
#define SD_DISK_SIZE 720
#define ED_DISK_SIZE 1024
#define DD_DISK_SIZE 720
/* Specific sectors */
#define SECTOR_VTOC 0x168 /* VTOC / free space bitmap */
#define SECTOR_VTOC2 0x400 /* VTOC2 */
#define SECTOR_DIR 0x169 /* First directory sector */
/* Number of directory sectors */
#define SECTOR_DIR_SIZE 8
/* Directory entry */
#define FLAG_NEVER_USED 0x00
#define FLAG_DELETED 0x80
#define FLAG_IN_USE 0x40
#define FLAG_LOCKED 0x20
#define FLAG_DOS2 0x02
#define FLAG_OPENED 0x01
/* Directory entry */
struct dirent {
unsigned char flag;
unsigned char count_lo;
unsigned char count_hi;
unsigned char start_lo;
unsigned char start_hi;
unsigned char name[8];
unsigned char suffix[3];
};
/* Size of a directory entry */
#define ENTRY_SIZE 16
/* Bytes within data sectors */
/* First 125 bytes are used for data */
#define DATA_SIZE 125
#define DD_DATA_SIZE 253
int data_size = DATA_SIZE;
/* Byte 125 has file number in upper 6 bits */
#define DATA_FILE_NUM 125 /* Upper 6 bits (0..63) */
#define DD_DATA_FILE_NUM 253
int data_file_num = DATA_FILE_NUM;
/* Byte 125 and 126 have next sector number: valid values (1..719) or (1..1023) */
#define DATA_NEXT_HIGH 125 /* Lower 2 bits */
#define DD_DATA_NEXT_HIGH 253
int data_next_high = DATA_NEXT_HIGH;
#define DATA_NEXT_LOW 126 /* All 8 bits */
#define DD_DATA_NEXT_LOW 254 /* All 8 bits */
int data_next_low = DATA_NEXT_LOW;
/* Byte 127 has number of bytes used */
#define DATA_BYTES 127
#define DD_DATA_BYTES 255
int data_bytes = DATA_BYTES;
void set_density(int dd)
{
if (dd) {
sector_size = DD_SECTOR_SIZE;
data_size = DD_DATA_SIZE;
data_file_num = DD_DATA_FILE_NUM;
data_next_high = DD_DATA_NEXT_HIGH;
data_next_low = DD_DATA_NEXT_LOW;
data_bytes = DD_DATA_BYTES;
disk_dd = 1;
} else {
sector_size = SECTOR_SIZE;
data_size = DATA_SIZE;
data_file_num = DATA_FILE_NUM;
data_next_high = DATA_NEXT_HIGH;
data_next_low = DATA_NEXT_LOW;
data_bytes = DATA_BYTES;
disk_dd = 0;
}
}
/* Bytes within VTOC */
/* Bytes 0 - 9 is a header */
#define VTOC_TYPE 0
#define VTOC_NUM_SECTS 1
#define VTOC_NUM_UNUSED 3
#define VTOC_RESERVED 5
#define VTOC_UNUSED 6
/* Location of bitmap in VTOC */
#define VTOC_BITMAP 10
/* Bytes 10 - 99 used
If the bit is a 1, the sector is free.
If the bit is a 0, the sector is in use.
Left most bit of byte 10 is sector 0 (does not exist)
Right most bit of byte 99 is sector 719
Sector 720 can not be used by DOS.
First real sector is sector 1.
*/
/* Bytes 100 - 127 unused */
/* VTOC2 format */
/* Size of bitmap */
#define SD_BITMAP_SIZE 90
#define ED_BITMAP_SIZE 128
/* Offset to first bitmap byte copied to VTOC2 */
#define ED_BITMAP_START 6
/* ED disks have 128 bytes for their bitmap:
* VTOC has bytes 0 - 99 and is located at offset 10 within the VTOC sector
* VTOC2 has bytes 6 - 127 and is located at offset 0 within the VTOC2 sector
*/
#define VTOC2_NUM_UNUSED 122
FILE *disk;
int getsect(unsigned char *buf, int sect)
{
int offset;
size_t size;
if (!sect) {
fprintf(stderr,"Oops, tried to read sector 0\n");
return -1;
}
sect -= 1;
if (disk_dd) {
if (sect < 3) {
size = SECTOR_SIZE;
offset = SECTOR_SIZE * sect;
} else {
size = DD_SECTOR_SIZE;
offset = SECTOR_SIZE * 3 + DD_SECTOR_SIZE * (sect - 3);
}
} else {
size = SECTOR_SIZE;
offset = SECTOR_SIZE * sect;
}
if (fseek(disk, offset + 16, SEEK_SET)) {
fprintf(stderr,"Oops, tried to seek past end (sector %d)\n", sect + 1);
status = 1;
return -1;
}
if (size != fread((char *)buf, 1, size, disk)) {
fprintf(stderr,"Oops, read error (sector %d)\n", sect + 1);
status = 1;
return -1;
}
return 0;
}
void putsect(unsigned char *buf, int sect)
{
int offset;
size_t size;
if (!sect) {
fprintf(stderr,"Oops, requested sector 0\n");
exit(-1);
}
sect -= 1;
if (disk_dd) {
if (sect < 3) {
size = SECTOR_SIZE;
offset = SECTOR_SIZE * sect;
} else {
size = DD_SECTOR_SIZE;
offset = SECTOR_SIZE * 3 + DD_SECTOR_SIZE * (sect - 3);
}
} else {
size = SECTOR_SIZE;
offset = SECTOR_SIZE * sect;
}
if (fseek(disk, offset + 16, SEEK_SET)) {
fprintf(stderr,"Oops, seek error during write (sector %d)\n", sect + 1);
exit(-1);
}
if (size != fwrite((char *)buf, 1, size, disk)) {
fprintf(stderr,"Oops, write error (sector %d)\n", sect + 1);
exit(-1);
}
}
/* Count number of free sectors in a bitmap */
int count_free(unsigned char *bitmap, int len)
{
int count = 0;
int x;
while (len--) {
for (x = 1; x != 256; x *= 2) {
if (*bitmap & x)
++count;
}
++bitmap;
}
return count;
}
/* Fix it? */
int fix;
int fixit()
{
if (!fix)
return 0;
for (;;) {
char buf[80];
printf("Fix it (y,n)? ");
fflush(stdout);
if (fgets(buf,sizeof(buf),stdin)) {
if (buf[0] == 'y' || buf[0] == 'Y')
return 1;
else if (buf[0] == 'n' || buf[0] == 'N')
return 0;
}
}
}
/* Get allocation bitmap */
void getmap(unsigned char *bitmap, int check)
{
unsigned char vtoc[DD_SECTOR_SIZE];
unsigned char vtoc2[DD_SECTOR_SIZE];
int upd = 0;
if (getsect(vtoc, SECTOR_VTOC)) {
fprintf(stderr," (trying to read VTOC)\n");
exit(-1);
}
memcpy(bitmap, vtoc + VTOC_BITMAP, SD_BITMAP_SIZE);
if (check) {
int count = count_free(bitmap, SD_BITMAP_SIZE);
int vtoc_count = vtoc[VTOC_NUM_UNUSED] + (256 * vtoc[VTOC_NUM_UNUSED + 1]);
int vtoc_total = vtoc[VTOC_NUM_SECTS] + (256 * vtoc[VTOC_NUM_SECTS + 1]);
int expected_size;
printf(" Checking that VTOC current free sector count matches bitmap...\n");
if (count != vtoc_count) {
fprintf(stderr," ** It doesn't match: bitmap has %d free, but VTOC count is %d\n", count, vtoc_count);
status = 1;
if (fixit()) {
vtoc[VTOC_NUM_UNUSED] = (0xFF & count);
vtoc[VTOC_NUM_UNUSED + 1] = (0xFF & (count >> 8));
upd = 1;
}
} else {
printf(" It's OK (count is %d)\n", count);
}
if (disk_size == ED_DISK_SIZE)
expected_size = 1010; /* 1011 if we don't pre-allocate 720 */
else
expected_size = 707;
printf(" Checking that VTOC initial free sector count is %d...\n", expected_size);
if (vtoc_total != expected_size) {
fprintf(stderr," ** It's wrong, we found: %d\n", vtoc_total);
status = 1;
if (fixit()) {
vtoc[VTOC_NUM_SECTS] = (0xFF & expected_size);
vtoc[VTOC_NUM_SECTS + 1] = (0xFF & (expected_size >> 8));
upd = 1;
}
} else
printf(" It's OK\n");
printf(" Checking that VTOC type code is 2...\n");
if (vtoc[VTOC_TYPE] == 2)
printf(" It's OK\n");
else {
fprintf(stderr, " ** It's wrong, we found: %d\n", vtoc[VTOC_TYPE]);
status = 1;
if (fixit()) {
vtoc[VTOC_TYPE] = 2;
upd = 1;
}
}
if (upd) {
printf("Saving VTOC1 fixes...\n");
putsect(vtoc, SECTOR_VTOC);
printf(" done.\n");
upd = 0;
fixes = 1;
}
}
if (disk_size == ED_DISK_SIZE) {
if (getsect(vtoc2, SECTOR_VTOC2)) {
printf(" (trying to read VTOC2)\n");
exit(-1);
}
memcpy(
bitmap + SD_BITMAP_SIZE,
vtoc2 + (SD_BITMAP_SIZE - ED_BITMAP_START),
ED_BITMAP_SIZE - SD_BITMAP_SIZE
);
if (check) {
int count = count_free(bitmap + SD_BITMAP_SIZE, ED_BITMAP_SIZE - SD_BITMAP_SIZE);
int vtoc2_count = vtoc2[VTOC2_NUM_UNUSED] + 256 * vtoc2[VTOC2_NUM_UNUSED + 1];
printf(" Checking that VTOC2 current free sector count matches bitmap...\n");
if (count != vtoc2_count) {
fprintf(stderr," ** It doesn't match: bitmap has %d free, but VTOC2 count is %d\n", count, vtoc2_count);
status = 1;
if (fixit()) {
vtoc2[VTOC2_NUM_UNUSED] = (count & 0xFF);
vtoc2[VTOC2_NUM_UNUSED + 1] = (0xFF & (count >> 8));
upd = 1;
}
} else {
printf(" It's OK (count is %d)\n", count);
}
if (upd) {
printf("Saving VTOC2 fixes...\n");
putsect(vtoc2, SECTOR_VTOC2);
printf(" done.\n");
upd = 0;
fixes = 1;
}
}
}
}
/* Write back allocation bitmap */
void putmap(unsigned char *bitmap)
{
unsigned char vtoc[DD_SECTOR_SIZE];
int count;
unsigned char vtoc2[DD_SECTOR_SIZE];
if (getsect(vtoc, SECTOR_VTOC)) {
fprintf(stderr," (trying to read VTOC)\n");
exit(-1);
}
memcpy(vtoc + VTOC_BITMAP, bitmap, SD_BITMAP_SIZE);
/* Update free count */
count = count_free(bitmap, SD_BITMAP_SIZE);
vtoc[VTOC_NUM_UNUSED] = count;
vtoc[VTOC_NUM_UNUSED + 1] = (count >> 8);
putsect(vtoc, SECTOR_VTOC);
if (disk_size == ED_DISK_SIZE) {
if (getsect(vtoc2, SECTOR_VTOC2)) {
fprintf(stderr," (trying to read VTOC2)\n");
exit(-1);
}
memcpy(vtoc2, bitmap + ED_BITMAP_START, ED_BITMAP_SIZE - ED_BITMAP_START);
/* Update free count */
count = count_free(bitmap + SD_BITMAP_SIZE, ED_BITMAP_SIZE - SD_BITMAP_SIZE);
vtoc2[VTOC2_NUM_UNUSED] = count;
vtoc2[VTOC2_NUM_UNUSED + 1] = (count >> 8);
putsect(vtoc2, SECTOR_VTOC2);
}
}
/* Segment list */
struct segment
{
struct segment *next;
int start; /* 2E0=RUN, 2E2=INIT */
int size;
int init;
int run;
};
/* File stored internally for nice formatting */
struct name
{
char *name;
/* From directory entry */
int locked; /* Set if write-protected */
int sector; /* Starting sector of file */
int sects; /* Sector count */
int is_sys; /* Set if it's a .SYS file */
int is_cm; /* Set if it's a .COM file */
/* From file itself */
struct segment *segments;
int size;
};
/* Array of internal file names for formatting */
struct name *names[(SECTOR_DIR_SIZE * SECTOR_SIZE) / ENTRY_SIZE];
int name_n;
/* For qsort */
int comp(struct name **l, struct name **r)
{
return strcmp((*l)->name, (*r)->name);
}
/* Fine an empty directory entry to use for a new file */
int find_empty_entry()
{
unsigned char buf[DD_SECTOR_SIZE];
int x;
for (x = SECTOR_DIR; x != SECTOR_DIR + SECTOR_DIR_SIZE; ++x) {
int y;
if (getsect(buf, x)) {
fprintf(stderr," (trying to read directory sector)\n");
exit(-1);
}
for (y = 0; y != SECTOR_SIZE; y += ENTRY_SIZE) {
struct dirent *d = (struct dirent *)(buf + y);
if (!(d->flag & FLAG_IN_USE)) {
return (x - SECTOR_DIR) * SECTOR_SIZE / ENTRY_SIZE + (y / ENTRY_SIZE);
}
}
}
return -1;
}
int lower(int c)
{
if (c >= 'A' && c <= 'Z')
return c - 'A' + 'a';
else
return c;
}
/* Convert file name from directory into UNIX zero-terminated C string name */
char *getname(struct dirent *d)
{
static char s[50];
int p = 0;
int r;
int i;
/* Get name */
for (i = 0; i != sizeof(d->name); i++) {
s[p++] = lower(d->name[i]);
}
/* Zap trailing spaces */
while (p && s[p - 1] == ' ') --p;
/* Append '.' */
s[p++] = '.';
r = p;
/* Get extension */
for (i = 0; i != sizeof(d->suffix); i++) {
s[p++] = lower(d->suffix[i]);
}
/* Zap tailing spaces */
while (p && s[p - 1] == ' ') --p;
/* Zap '.' if no extension */
if (p == r) --p;
/* Terminate */
s[p] = 0;
return s;
}
/* Write UNIX name into Atari directory entry */
void putname(struct dirent *d, char *name)
{
int x;
/* Copy file name into directory entry */
x = 0;
while (*name && *name != '.' && x < 8) {
if (*name >= 'a' && *name <= 'z')
d->name[x++] = *name++ - 'a' + 'A';
else
d->name[x++] = *name++;
}
while (x < 8) {
d->name[x++] = ' ';
}
x = 0;
while (*name && *name != '.')
++name;
if (*name == '.') {
++name;
while (*name && x < 3) {
if (*name >= 'a' && *name <= 'z')
d->suffix[x++] = *name++ - 'a' + 'A';
else
d->suffix[x++] = *name++;
}
}
while (x < 3) {
d->suffix[x++] = ' ';
}
}
/* Find a file, return number of its first sector */
/* If del is set, mark directory for deletion */
int find_file(char *filename, int del, char *new_name)
{
unsigned char buf[DD_SECTOR_SIZE];
int x;
for (x = SECTOR_DIR; x != SECTOR_DIR + SECTOR_DIR_SIZE; ++x) {
int y;
if (getsect(buf, x)) {
fprintf(stderr," (trying to read directory)\n");
goto done;
}
for (y = 0; y != SECTOR_SIZE; y += ENTRY_SIZE) {
struct dirent *d = (struct dirent *)(buf + y);
/* OSS OS/A+ disks put junk after first never used directory entry */
if (!(d->flag & (FLAG_IN_USE | FLAG_DELETED)))
goto done;
if (d->flag & FLAG_IN_USE) {
char *s = getname(d);
if (!strcmp(s, filename)) {
if (del) {
d->flag = 0x80;
putsect(buf, x);
}
if (new_name) {
putname(d, new_name);
putsect(buf, x);
}
return (d->start_hi << 8) + d->start_lo;
}
}
}
}
done:
return -1;
}
/* Read a file */
int cvt_ending = 0;
void read_file(int sector, FILE *f)
{
int count = 0;
do {
unsigned char buf[DD_SECTOR_SIZE];
int next;
int file_no;
int bytes;
if (count == 2048) {
fprintf(stderr," (file too long)\n");
status = 1;
break;
}
if (getsect(buf, sector)) {
fprintf(stderr," (trying to read from file)\n");
status = 1;
return;
}
++count;
next = (int)buf[data_next_low] + ((int)(0x3 & buf[data_next_high]) << 8);
file_no = ((buf[data_file_num] >> 2) & 0x3F);
bytes = buf[data_bytes];
/* printf("Sector %d: next=%d, bytes=%d, file_no=%d, short=%d\n",
sector, next, bytes, file_no, short_sect); */
if (cvt_ending) {
int x;
for (x = 0; x != bytes; ++x)
if (buf[x] == 0x9b) {
buf[x] = '\n';
}
}
fwrite(buf, bytes, 1, f);
sector = next;
} while(sector);
}
/* cat a file */
void cat(char *name)
{
int sector = find_file(name, 0, NULL);
if (sector == -1) {
fprintf(stderr,"File '%s' not found\n", name);
exit(-1);
} else {
/* printf("Found file. First sector of file is %d\n", sector); */
read_file(sector, stdout);
}
}
/* get a file from the disk */
int get_file(char *atari_name, char *local_name)
{
int sector = find_file(atari_name, 0, NULL);
if (sector == -1) {
fprintf(stderr,"File '%s' not found\n", atari_name);
return -1;
} else {
FILE *f = fopen(local_name, "w");
if (!f) {
fprintf(stderr,"Couldn't open local file '%s'\n", local_name);
return -1;
}
/* printf("Found file. First sector of file is %d\n", sector); */
read_file(sector, f);
if (fclose(f)) {
fprintf(stderr,"Couldn't close local file '%s'\n", local_name);
return -1;
}
return status;
}
}
/* Mark a sector as allocated or free */
void mark_space(unsigned char *bitmap, int start, int alloc)
{
if (alloc) {
bitmap[start >> 3] &= ~(1 << (7 - (start & 7)));
} else {
bitmap[start >> 3] |= (1 << (7 - (start & 7)));
}
}
/* Delete file */
int del_file(int sector)
{
unsigned char bitmap[ED_BITMAP_SIZE];
int count = 0;
getmap(bitmap, 0);
do {
unsigned char buf[DD_SECTOR_SIZE];
int next;
int file_no;
int bytes;
if (count == 2048) {
fprintf(stderr," (file too long)\n");
break;
}
if (getsect(buf, sector)) {
fprintf(stderr," (while deleting a file)\n");
break;
}
++count;
next = (int)buf[data_next_low] + ((int)(0x3 & buf[data_next_high]) << 8);
file_no = ((buf[data_file_num] >> 2) & 0x3F);
bytes = buf[data_bytes];
/* printf("Sector %d: next=%d, bytes=%d, file_no=%d, short=%d\n", sector, next, bytes, file_no, short_sect); */
mark_space(bitmap, sector, 0);
sector = next;
} while(sector);
putmap(bitmap);
return 0;
}
/* Delete file name */
int rm(char *name, int ignore)
{
int first_sect = find_file(name, 1, NULL);
if (first_sect != -1) {
if (del_file(first_sect)) {
fprintf(stderr,"Error deleting file '%s'\n", name);
return -1;
} else {
return status;
}
} else {
if (!ignore) {
fprintf(stderr,"File '%s' not found\n", name);
status = 1;
}
return -1;
}
}
/* Count free sectors */
int amount_free(unsigned char *bitmap)
{
int total = 0;
int x;
for (x = 0; x != disk_size; ++x) {
if (bitmap[(x >> 3)] & (1 << (7 - (x & 7))))
++total;
}
return total;
}
/* Free command */
int do_free(void)
{
int amount;
unsigned char bitmap[ED_BITMAP_SIZE];
getmap(bitmap, 0);
amount = amount_free(bitmap);
printf("%d free sectors, %d free bytes\n", amount, amount * sector_size);
return 0;
}
/* Check a single file */
int check_file(struct dirent *d, int y, int x, char *map, char *name[])
{
unsigned char fbuf[DD_SECTOR_SIZE];
char *filename = strdup(getname(d));
int upddir = 0;
int sector;
int sects;
int count = 0;
int upd = 0;
int file_no = (y / ENTRY_SIZE) + ((x - SECTOR_DIR) * SECTOR_SIZE / ENTRY_SIZE);
sector = (d->start_hi << 8) + d->start_lo;
sects = (d->count_hi << 8) + d->count_lo;
printf("Checking %s (file_no %d)\n", filename, file_no);
if (d->flag & FLAG_OPENED) {
printf(" ** Warning: file is marked as opened\n");
if (fixit()) {
d->flag &= ~FLAG_OPENED;
upddir = 1;
}
}
do {
int next;
int sector_file_no;
++count;
if (count == 2048) {
fprintf(stderr," (file too long)\n");
status = 1;
break;
}
if (getsect(fbuf, sector)) {
fprintf(stderr," (reading file)\n");
exit(-1);
}
if (map[sector] != -1) {
fprintf(stderr," ** Uh oh.. sector %d already in use by %s (%d)\n", sector, name[sector] ? name[sector] : "reserved", map[sector]);
status = 1;
}
if (map[sector] == file_no) {
fprintf(stderr," ** Warning: Infinite linked list detected\n");
status = 1;
break;
} else {
int dsize;
map[sector] = file_no;
name[sector] = filename;
next = (int)fbuf[data_next_low] + ((int)(0x3 & fbuf[data_next_high]) << 8);
sector_file_no = ((int)fbuf[data_file_num] >> 2);
if (sector_file_no != file_no) {
fprintf(stderr," ** Warning: Sector %d claims to belong to file %d\n", sector, sector_file_no);
status = 1;
if (fixit()) {
fbuf[data_file_num] = (fbuf[data_file_num] & 0x3) | (file_no << 2);
upd = 1;
}
}
dsize = (int)fbuf[data_bytes];
if (next) {
if (dsize != data_size) {
fprintf(stderr, " ** Warning: Sector %d is short\n", sector);
}
} else {
if (dsize == 0) {
fprintf(stderr, " ** Warning: Sector %d (last sector of file) is empty\n", sector);
}
}
}
if (upd) {
putsect(fbuf, sector);
fixes = 1;
upd = 0;
}
sector = next;
} while (sector);
if (count != sects) {
fprintf(stderr," ** Warning: size in directory (%d) does not match size on disk (%d) for file %s\n",
sects, count, filename);
status = 1;
if (fixit()) {
d->count_hi = (0xFF & (count >> 8));
d->count_lo = (0xFF & count);
upddir = 1;
}
}
printf(" Found %d sectors\n", count);
return upddir;
}
/* Check disk: regen bit map */
int do_check()
{
unsigned char bitmap[ED_BITMAP_SIZE];
unsigned char buf[DD_SECTOR_SIZE];
int x;
int total;
int ok;
int found_eod = 0;
char map[ED_DISK_SIZE];
char *name[ED_DISK_SIZE];
if (disk_size == ED_DISK_SIZE)
printf("Checking DOS 2.5 enhanced density disk...\n");
else if (disk_dd)
printf("Checking DOS 2.0d double density disk...\n");
else
printf("Checking DOS 2.0s single density disk...\n");
/* Mark all as free */
for (x = 0; x != ED_DISK_SIZE; ++x) {
map[x] = -1;
name[x] = 0;
}
/* Mark non-existent sector 0 as allocated */
map[0] = 64;
/* Mark VTOC and DIR */
map[SECTOR_VTOC] = 64;
for (x = SECTOR_DIR; x != SECTOR_DIR + SECTOR_DIR_SIZE; ++x)
map[x] = 64;