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FishMarket 1.0
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FishMarket v1.0.iso
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disk_128
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mrbackup
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formatdisk.c
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C/C++ Source or Header
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1992-05-06
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8KB
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318 lines
/* Format a floppy disk (880k drive).
* Author: Mark R. Rinfret
* Date: 06/28/87
* Description:
* This set of routines may be incorporated into a program which
* has need of formatting a floppy disk. I wrote it to support my
* hard disk backup utility.
*
* History: (most recent change first)
*
* 08/26/87 -MRR- Modified FormatDisk to delay 5 seconds after
* uninhibiting the drive. This should give enough time
* for the validator to do its thing and prevent the
* "Insert disk..." requester from rearing its ugly head
* if the application attempts to access the disk as
* soon as we return.
*/
#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/lists.h>
#include <exec/memory.h>
#include <exec/interrupts.h>
#include <exec/ports.h>
#include <exec/libraries.h>
#include <exec/io.h>
#include <exec/tasks.h>
#include <exec/execbase.h>
#include <exec/devices.h>
#include <devices/trackdisk.h>
#include <libraries/dosextens.h>
#include <intuition/intuition.h>
#include <functions.h>
extern struct IOExtTD *CreateExtIO();
static int CkIOErr();
/* #define DEBUG */
#define MAX_NAME 30L
#define TD_WRITE CMD_WRITE
#define TRACKSIZE NUMSECS * TD_SECTOR
/* Format a floppy disk - hardwired for the 3.5" 880k floppy drives.
* Called with:
* drivename: device name (DF0, etc.)
* name: new volume name
* Returns:
* Zero on success, 1 on failure
* Note:
* This routine does not currently perform a verification, as
* recommended by the RKM. Perhaps later...
* I also discovered that there's some erroneous crap in
* "The Amiga Programmer's Workbook, Vol. II", by
* Eugene P. Mortimore. On page 339, he states that only 512
* bytes of track data are required for formatting. The RKM
* correctly states that a "track's worth of data" is required.
* It took some playing with DiskEd to discover this error.
*/
int
FormatDisk(drivename,name)
char *drivename; char *name;
{
long checksum;
char *dos_id = "DOS";
long dosword = 0;
SHORT error;
struct MsgPort *diskport = NULL;
struct IOExtTD *diskreq = NULL;
ULONG diskchangecount;
struct Process *myprocess;
struct Window *mywindow;
USHORT status = 0, i, retry, track;
int unit;
char *volname;
char *diskbuffer;
ULONG *diskblock; /* alias for diskbuffer, ULONG type */
if (strlen(name) >= MAX_NAME) {
#ifdef DEBUG
printf("Disk name is too long!\n");
#endif
status = ERROR_INVALID_COMPONENT_NAME;
goto cleanup;
}
if ((unit = (drivename[2]-'0')) < 0 || unit >= NUMUNITS) {
#ifdef DEBUG
printf("FormatDisk: invalid drive specification!\n");
#endif
status = ERROR_INVALID_COMPONENT_NAME;
goto cleanup;
}
if (!(diskbuffer =
AllocMem((long) TRACKSIZE, MEMF_PUBLIC | MEMF_CHIP))) {
status = ERROR_NO_FREE_STORE;
goto cleanup;
}
/* Store DOS "magic word" in disk block to be written during
* formatting.
*/
diskblock = (ULONG *) diskbuffer;/* we'll need this later */
for (i = 0; i < 3; ++i)
dosword = (dosword << 8) | dos_id[i];
dosword = dosword << 8;
#ifdef DEBUG
printf("dosword is %lx\n",dosword);
#endif
for (i = 0; i < TRACKSIZE / 4; ++i)
diskblock[i] = (dosword | (long) (i & 0xff));
if ((diskport = CreatePort(0L, 0L)) == NULL) {
#ifdef DEBUG
printf("FormatDisk can't create port!\n");
#endif
status = 1; /* is there a better error code? */
goto cleanup;
}
if (!(diskreq = (struct IOExtTD *)
CreateExtIO(diskport, (long) sizeof(struct IOExtTD)))) {
status = 1;
goto cleanup;
}
if (status = OpenDevice(TD_NAME, (long) unit, diskreq, 0L)) {
#ifdef DEBUG
printf("FormatDisk: OpenDevice error: %d\n",error);
#endif
goto cleanup;
}
if (status = Inhibit(drivename, 1)) {
#ifdef DEBUG
printf("FormatDisk: unable to inhibit drive!\n");
#endif
goto cleanup;
}
/* Get the current disk change count. This allows the trackdisk
* driver to detect unwanted disk changes later on.
*/
diskreq->iotd_Req.io_Command = TD_CHANGENUM;
DoIO(diskreq);
/* Save a copy of the disk change count. */
diskchangecount = diskreq->iotd_Req.io_Actual;
#ifdef DEBUG
printf("Current disk change count is %ld\n", diskchangecount);
#endif
/* Format the disk, one track at a time. */
for (track = 0; track < NUMTRACKS; ++track) {
diskreq->iotd_Req.io_Command = TD_FORMAT;
diskreq->iotd_Req.io_Flags = 0;
diskreq->iotd_Req.io_Data = (APTR) diskbuffer;
diskreq->iotd_Count = diskchangecount;
diskreq->iotd_Req.io_Length = NUMSECS * TD_SECTOR;
diskreq->iotd_Req.io_Offset = track * NUMSECS * TD_SECTOR;
DoIO(diskreq);
if (status = CkIOErr(diskreq,"Formatting error")) {
#ifdef DEBUG
printf(" Track: %d\n",track);
#endif
goto cleanup;
}
}
/* Now comes some real KLUDGING. Fill in the root block and the
* first hash block. The information for this was gathered from
* the "AmigaDos Technical Reference Manual" and some sleuthing
* with DiskEd.
*/
for (i = 0; i < 128; ++i)
diskblock[i] = 0;
diskblock[0] = 2; /* T.SHORT (type) */
diskblock[3] = 128 - 56; /* hashtable size */
diskblock[78] = 0xffffffff; /* BMFLAG */
diskblock[79] = 881; /* first bitmap block */
DateStamp(&diskblock[105]); /* volume last altered date/time */
DateStamp(&diskblock[121]); /* volume creation date/time */
volname = (char *) &diskblock[108];
/* convert input name to BSTR */
*volname = strlen(name);
for (i = 0; i < *volname; ++i)
*(volname + 1 + i) = *(name + i);
diskblock[127] = 1; /* ST.ROOT (secondary type) */
checksum = 0;
for (i = 0; i < 128; ++i)
checksum += diskblock[i];
diskblock[5] = - checksum;
/* Write the root block out to the disk. */
diskreq->iotd_Req.io_Command = TD_WRITE;
diskreq->iotd_Req.io_Length = TD_SECTOR;
diskreq->iotd_Req.io_Offset = TD_SECTOR * 880L;
DoIO(diskreq);
if (status = CkIOErr(diskreq, "Error writing root block")) {
goto cleanup;
}
/* Write the first bitmap block. */
for (i = 0; i < 56; ++i)
diskblock[i] = 0xffffffff;
for (i = 56; i < 128; ++i)
diskblock[i] = 0;
diskblock[0] = 0xc000c037; /* hint: x37 = 55 (last word of map?) */
diskblock[28] = 0xffff3fff; /* blocks 880, 881 used */
diskblock[55] = 0x3fffffff; /* blocks 1760, 1761 used? */
diskreq->iotd_Req.io_Length = TD_SECTOR;
diskreq->iotd_Req.io_Offset = 881L * TD_SECTOR;
DoIO(diskreq); /* write out the bitmap */
if (status = CkIOErr(diskreq, "Error writing bitmap")) {
goto cleanup;
}
diskreq->iotd_Req.io_Command = ETD_UPDATE;
diskreq->iotd_Req.io_Flags = 0;
DoIO(diskreq);
/* Turn the disk motor off. */
diskreq->iotd_Req.io_Command = TD_MOTOR;
diskreq->iotd_Req.io_Length = 0;
DoIO(diskreq);
Inhibit(drivename, 0); /* enable disk validator */
Delay(3L * TICKS_PER_SECOND); /* Give it a chance */
cleanup:
CloseDevice(diskreq);
if (diskbuffer) FreeMem(diskbuffer, (long) TRACKSIZE);
if (diskreq) DeleteExtIO(diskreq, (long) sizeof(*diskreq));
if (diskport) DeletePort(diskport);
return status;
}
/* Check the disk request block for an error code. If an error
* occurred, print the argument string.
* Called with:
* req: pointer to I/O request structure
* msg: error message string
* Returns:
* error code from request structure
*/
static int CkIOErr(req, msg)
struct IOStdReq *req; char *msg;
{
register int code;
if (code = req->io_Error) {
#ifdef DEBUG
printf("%s, code: %d\n",msg,code);
#endif
}
return code;
}
#ifdef DEBUG
main(argc, argv)
int argc; char *argv[];
{
char *diskname;
char *volname;
int unit;
if (argc < 3)
volname = "GoodJob!";
else
volname = argv[2];
if (argc < 2)
diskname = "DF1:";
else {
diskname = argv[1];
if (strlen(diskname) != 4 ||
(strncmp(diskname,"df",2) && strncmp(diskname,"DF",2))) {
bad_drive:
printf("Drive name may only be df0: through df3:!\n");
exit(1);
}
if ((unit = (diskname[2] - '0')) < 0 || unit > 3)
goto bad_drive;
}
printf("Insert disk in %s, then hit return\n",diskname);
while (getchar() != '\n');
if (FormatDisk(diskname,volname))
printf("FormatDisk failed\n");
else {
printf("FormatDisk succeeded\n");
}
}
#endif