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btn.c
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1994-03-13
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/**** BTNtape Handler for SCSI tape drives ****/
/**** Author: Bob Rethemeyer (drBob@cup.portal.com) ****/
#define VERSDATE "(03.14.94)" /* (DD.MM.YY) */
#define VERSNAME "BTNtape-RAR 3.0 "
/* (If you recompile BTN, ^^^ put your initials here!) */
/*--------------------------------------------------------------------------
* (c) Copyright 1990,1994 Robert Rethemeyer.
* This software may be freely distributed and redistributed,
* for non-commercial purposes, provided this notice is included.
*--------------------------------------------------------------------------
* BTNtape is an AmigaDOS device handler to make a simple DOS TAPE: device.
* It converts DOS packets for the device into I/O requests to a
* "SCSI-direct" compatible device driver. It is based on "my.handler"
* by Phillip Lindsay and a SCSI-direct program by Robert Mitchell.
* Seek() handling derived from code by Dennis J. Brueni, 8-24-91.
* Source is ANSI C compliant. Compile with SAS/C v6.
*
* This handler works in conjunction with the accompanying TapeMon program.
*--------------------------------------------------------------------------
*/
#define _STRICT_ANSI
#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/lists.h>
#include <exec/ports.h>
#include <exec/tasks.h>
#include <exec/libraries.h>
#include <exec/io.h>
#include <exec/memory.h>
#include <devices/scsidisk.h>
#include <intuition/intuition.h>
#include <libraries/dos.h>
#include <libraries/dosextens.h>
#include <libraries/filehandler.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include "btn.h"
#include "tplink.h"
#include <proto/exec.h>
#include <proto/intuition.h>
#include <pragmas/exec_pragmas.h>
#include <pragmas/intuition_pragmas.h>
/* sense keys of interest */
#define NOS 0x00 /* no sense */
#define RCV 0x01 /* recovered error */
#define ILL 0x05 /* illegal request */
#define UAT 0x06 /* unit attention */
#define BLC 0x08 /* blank check */
#define VOF 0x0d /* volume overflow */
/* pseudo sense keys returned by DoSense */
#define FMK 0x10 /* filemark */
#define EOM 0x11 /* end of tape */
#define ILI 0x12 /* incorr leng */
#define SERR 0x13 /* SCSI error */
/*======== Global data */
struct ExecBase *SysBase;
struct IntuitionBase *IntuitionBase=NULL;
UBYTE *cdb; /* pointer to SCSI command buffer */
UBYTE *sns; /* pointer to sense data buffer */
UBYTE *inq; /* pointer to inquiry data */
struct SCSICmd *cmd; /* pointer to scsidirect command */
struct IOStdReq *ior; /* pointer to io request structure*/
UBYTE *TapeBuff[2]={NULL,NULL};/* pointers to 2 tape buffers */
struct Process *myproc; /* ptr to handler's process struct*/
struct DosPacket *mypkt; /* ptr to dos packet sent */
struct tplink *linktp; /* pointer to link structure */
struct MsgPort *monport=NULL; /* ptr to mon communication msg port */
struct MsgPort *btnport; /* ptr to btn communication msg port */
struct BTNmsg monmsg; /* message we will send to tapemon*/
ULONG blknum; /* block number for io operation */
ULONG blksize = 512; /* bytes per tape block */
ULONG numblks = 1; /* number of blocks per io oper */
ULONG TBSize; /* bytes in a tape buffer */
ULONG rwlen; /* bytes in a tape read/write */
ULONG rdlen; /* bytes/blks in a read */
ULONG expect; /* expect num of bytes transferred*/
ULONG bugmask = 0; /* 2090A bug circumvention */
long filenum = -1; /* current file position on tape */
long lastwrtn= -1; /* last filenum written */
long actual; /* actual num of bytes transferred*/
long res1; /* #bytes xfered packet return */
long Boff; /* current offset in tape buffer */
long tpsize ; /* tape size in blocks */
long reserved = 0; /* number of reserved blks at BOT */
int tapenum; /* tape volume number */
BOOL inprog = FALSE; /* io operation in progress flag */
BOOL reten = FALSE; /* retension-on-UAT flag */
BOOL mbusy = FALSE; /* waiting for reply from tapemon */
BOOL bswap = FALSE; /* swap-bytes flag */
BOOL dbug = FALSE; /* print debug info */
char *z; /* scratch */
char *devname, nbuf[32]; /* file name reference from Open()*/
char dbb[80]; /* buffer for monitor messages */
UBYTE Lun = 0; /* Logical Unit number << 5 */
UBYTE varblk = 0; /* variable-block flag for SEQ */
UBYTE fixedbit = 0; /* fixed-block mode bit for SEQ */
UBYTE versiontag[] = "$VER: " VERSNAME VERSDATE;
char *cpywr = "(c) Copyright 1990-1994 R. Rethemeyer";
/*********************** Main program ********************************/
void _main(char *nu)
{
struct SCSICmd scsicmd; /* SCSIdirect command buffer */
UBYTE snsarea[64]; /* sense data buffer */
UBYTE cmdbuff[16]; /* SCSI command buffer */
UBYTE inqdata[40]; /* inquiry data buffer */
struct tplink tpl; /* structure to link hndlr & mon */
struct DeviceNode *mynode; /* ptr to devnode passed in pkt Arg3 */
struct MsgPort *mp; /* ptr to io message port */
struct MsgPort *pktport; /* ptr to process message port */
struct Message *m;
struct BTNmsg *b;
ULONG dvnode; /* ptr to devnode passed in pkt Arg3 */
ULONG unit=99999; /* device SCSI unit address */
ULONG bufmemtype=0; /* type of mem for dynamic buffers */
ULONG gotopos=0; /* position to open at (blk/filemark)*/
ULONG fmarks=1; /* # file marks for write/skip */
ULONG pktsig; /* signal mask for process msg port */
ULONG btnsig=0; /* signal mask for mon comm msg port */
char *driver; /* name of SCSI device driver */
UBYTE *dptr; /* ptr to next byte in dos buffer */
long dflags=0; /* device flags */
long iostat; /* status of previous read */
long dcnt; /* count of dos packet bytes to move */
long mcnt; /* count of bytes to move */
long rcnt; /* count of bytes moved for read */
long current; /* current byte position in file */
long remain; /* bytes remaining in tape buffer */
long pkcnt; /* flag to indicate data written */
long x;
int y=0;
int opmode=0; /* how has the handler been opened */
#define CLOSED 0 /* not doing anything */
#define READING 1 /* reading tape */
#define WRITING 2 /* writing tape */
#define CURRPOS 3 /* read current file position */
#define RAWMODE 4 /* raw command mode */
#define UMODSEL 5 /* user mode select */
int Bn; /* current buffer number, 0 or 1 */
int position; /* how to position tape at Open */
#define POSREW 0 /* rewind to beginning */
#define POSNREW 1 /* don't move */
#define POSAPP 2 /* append to eod (seq) */
#define POSEND 3 /* append to eod (seq) */
#define POSSKIP 4 /* skip to file/block */
int nrflag=POSREW; /* rewind behavior of TAPE: */
BOOL rewcl = FALSE; /* rewind-on-close flag */
BOOL eject = FALSE; /* eject-on-close flag */
BOOL dirty = FALSE; /* buffer has unwritten data in it */
BOOL atend; /* flags filemark encountered */
BOOL eot; /* flags end-of-tape encountered */
BOOL rderr; /* flags error during read */
BOOL errec = FALSE; /* attempt error recovery flag */
BOOL aonly = FALSE; /* append-only flag */
BOOL rdonly =FALSE; /* read-only flag */
BOOL starting=FALSE;/* flag detects first open message */
BOOL dos2=FALSE; /* indicates if later OS version */
int Ctl=CTLIMM; /* Controls overlapped dos/scsi I/O */
char *termn8 = " TERMINATE BTN ";
char portname[32] = "BTN_";
char monpname[32] = "TMON_";
/*======== Startup */
SysBase = *((struct ExecBase **) (4));
IntuitionBase = (struct IntuitionBase *)OpenLibrary("intuition.library",0);
myproc = (struct Process *) FindTask(0L); /* find this process */
pktport= &myproc->pr_MsgPort;
pktsig = 1L << pktport->mp_SigBit;
WaitPort(pktport); /* wait for startup packet */
m = GetMsg(pktport);
mypkt = PKTADR(m);
/* packet: Arg1=BSTR to name, Arg2=BSTR to startup string, Arg3=BPTR devnode*/
mynode = (struct DeviceNode *) BADDR(mypkt->dp_Arg3);
dvnode = (ULONG) mypkt->dp_Arg3;
/*======== Create linkage block for tapemon.
*/
tpl.cpyw = cpywr;
tpl.version = "XXXXX " VERSNAME "(" __DATE__ ")";
tpl.devnode = (void *)mynode;
tpl.dbb = dbb;
tpl.unit = &unit;
tpl.Lun = &Lun;
tpl.sense = NULL;
tpl.badparm = FALSE;
linktp = &tpl;
/*======== Extract info from mountlist Startup parameter. It may be
======== enclosed in quotes, and each item is separated by a single '/'.
======== First item is always the driver name, others may be in any order.
*/
z = (char *)BADDR(mypkt->dp_Arg2)+1 ; /* Arg2= BSTR to mountlist 'Startup'*/
if(*z=='\"') { /* remove quotes if any */
z++;
z[strlen(z)-1]= '\0' ;
}
driver = tpl.driver = z;
for(; *z != '/'; z++);
*(z++) = '\0';
toUPPER(z);
while (y!=100) {
switch(y=getstart(&x)) {
case 0: /* UN */ unit = (ULONG) x; break;
case 1: /* BS */ blksize = (ULONG) x; break;
case 2: /* NB */ numblks = (ULONG) x; break;
case 3: /* RB */ reserved = x; break;
case 4: /* BT */ bufmemtype = (ULONG) x; break;
case 5: /* FM */ fmarks = x & 0xff; break;
case 6: /* ER */ errec = (x!=0); break;
case 7: /* OV */ if(!x) Ctl = CTLWAIT; break;
case 8: /* DF */ dflags = x; break;
case 9: /* C9 */ if(x) bugmask = 0x01000000; break;
case 10: /* NR */ nrflag = x ? POSNREW : POSREW; break;
case 11: /* RT */ reten = (x!=0); break;
case 12: /* RC */ rewcl = (x!=0); break;
case 13: /* EC */ eject = (x!=0); break;
case 14: /* SW */ bswap = (x!=0); break;
case 15: /* RO */ rdonly= (x!=0); break;
case 16: /* AO */ aonly = (x!=0); break;
case 17: /* MR */ starting = (x!=0); break;
case 18: /* DB */ dbug = (x!=0); break;
/***case -: * VB * if(x) varblk = 1; break; sorry, vb mode disabled */
case 99: /* ?? */ tpl.badparm = TRUE; break;
default: ;
}
}
Lun = (UBYTE) unit; Lun = ((Lun/10-(Lun/100)*10) & 7) << 5;
rwlen = TBSize = numblks * blksize; /* size of a tape buffer */
cdb = cmdbuff;
sns = snsarea;
inq = tpl.inquiry = inqdata;
cmd = &scsicmd;
ior = (struct IOStdReq *) CreateExtIO( mp=CreatePort(NULL,0),
sizeof(struct IOStdReq));
/*======== Open the SCSIdirect device */
if ( OpenDevice(driver,unit,(struct IORequest *)ior,dflags) ) {
ask("Can't open SCSI-direct",termn8,NULL);
LEAVE:
returnpkt(DOSFALSE,ERROR_INVALID_COMPONENT_NAME);
if(ior) DeleteExtIO((struct IORequest *)ior);
if(mp) DeletePort(mp);
CloseLibrary((struct Library *)IntuitionBase);
return;
}
/*======== Create the port that TapeMon will
======== use to acknowledge Mprintf() requests.
*/
if( btnport = CreatePort(
strcat(portname,myproc->pr_Task.tc_Node.ln_Name), 0) )
{
btnsig = 1L << btnport->mp_SigBit;
monmsg.bmsg.mn_ReplyPort = btnport;
/*======== If TapeMon is already running, send it a wakeup message. */
Forbid();
if(monport = FindPort(strcat(monpname,myproc->pr_Task.tc_Node.ln_Name)) )
PutMsg(monport,&monmsg.bmsg);
Permit();
if(monport) { WaitPort(btnport); GetMsg(btnport); }
monport = NULL;
}
/*======= Find the SCSI device type by INQUIRY. Sequential or direct access?
*/
if(x=TapeIO(INQUIRY,0,CTLWAIT)) {
if(x <= HFERR_SelTimeout) {
ask("Can't select tape drive",termn8,NULL);
goto LEAVE;
}
TapeIO(TSENSE,0,CTLWAIT);
inq[0] = 0x01; /* assume SEQ */
inq[8] = 0;
}
inq[36] = 0; /* null-terminate vendor info */
if(SEQ) {
reserved = 0;
fixedbit = varblk ^ 0x01; /* fixed or variable block mode */
rdlen = (fixedbit) ? numblks : TBSize;
}
else if(DAC) rdlen = numblks;
else { ask("UNit is not a tape drive",termn8,NULL); goto LEAVE; }
mynode->dn_Task = &myproc->pr_MsgPort; /* install handler taskid */
returnpkt(DOSTRUE,0); /* reply to initial packet */
/* =========== The main packet processing loop =============== */
for(;;) {
if( m = GetMsg(pktport) ) /* Check for packet from DOS */
mypkt = PKTADR(m);
else if( m = GetMsg(btnport) ) { /* Check for message from TapeMon */
if(m->mn_Node.ln_Type == NT_MESSAGE) {
b = (struct BTNmsg *)m;
/* Tapemon will send addr of port if it is starting up,
or NULL if it is shutting down. */
if(monport && b->mptr) b->mptr = NULL; /* reject extra TapeMon */
else { monport = b->mptr; b->mptr = linktp; }
ReplyMsg(m);
if(!monport) mbusy=FALSE;
}
else /*NT_REPLYMSG*/ mbusy=FALSE;
continue;
}
else { /* Nothing to do but Wait() */
Wait(pktsig | btnsig);
continue;
}
#ifdef DBUG
if(dbug) Mprintf("PACKET=%d %08X %08X %08X\n", mypkt->dp_Type,
mypkt->dp_Arg1, mypkt->dp_Arg2, mypkt->dp_Arg3);
#endif
switch(mypkt->dp_Type) {
case ACTION_FINDINPUT: /*----------- Open() ------------*/
case ACTION_FINDOUTPUT:
case ACTION_FINDUPDATE:
if(opmode != CLOSED) {
returnpkt(DOSFALSE,ERROR_OBJECT_IN_USE);
Mprintf("Already open\n");
break;
}
/* Determine open mode */
z = (char *)BADDR(mypkt->dp_Arg3);
x = (UBYTE)(*z);
devname = (char *)memcpy(nbuf, z+1, x);
*(devname+x) = '\0';
toUPPER(devname);
z = devname;
if(strchr(devname,':')) while(*(z++)!=':'); /*thx Tero Manninen*/
if (!strcmp(z,"RAWCMD")) opmode=RAWMODE;
else if(!strcmp(z,"MODESEL")) opmode=UMODSEL;
else if(!strcmp(z,"POS")) opmode=CURRPOS;
else { /* normal read/write */
opmode = (mypkt->dp_Type==ACTION_FINDINPUT) ? READING : WRITING;
if (!strcmp(z,"*")) position=POSNREW; /* current position */
else if(!strcmp(z,"NR")) position=POSNREW; /* current position */
else if(!strcmp(z,"R")) position=POSREW; /* beginning of tape */
else if(!strcmp(z,"APP")) position=POSAPP; /* append at end */
else if(!strcmp(z,"END")) position=POSEND; /* append at end,slow*/
else if(*z>='0' && *z<='9') { /* specific position */
gotopos = strtoul(z,NULL,0);
position=POSSKIP;
}
else if(*z=='\0') position = nrflag; /* TAPE: */
else goto BADNAME;
}
if(starting) goto FASTOPEN; /* skip stuff on first open from mount */
/* detect illegal combinations */
if((opmode>=RAWMODE && mypkt->dp_Type==ACTION_FINDINPUT)
|| (opmode==CURRPOS && mypkt->dp_Type!=ACTION_FINDINPUT)
|| (opmode==READING && (position==POSAPP||position==POSEND))
|| (SEQ && opmode==WRITING && position==POSSKIP)
|| (DAC && (position==POSEND||position==POSAPP)) )
{ BADNAME:
Mprintf("Invalid open name/combo %s\n",devname);
NOOPEN:
freestuff();
opmode=CLOSED;
returnpkt(DOSFALSE,ERROR_ACTION_NOT_KNOWN);
break;
}
if(SEQ && aonly && opmode==WRITING) {
if((position==POSNREW && lastwrtn>=0)
|| position==POSAPP
|| position==POSEND) ;
else { Mprintf("%s is append-only\n",devname);
goto NOOPEN; }
}
if(opmode==WRITING && rdonly) {
Mprintf("%s is read-only\n",devname);
goto NOOPEN;
}
/* Allocate storage for buffers */
TapeBuff[0] = (UBYTE *) AllocMem(TBSize, bufmemtype | MEMF_CLEAR);
TapeBuff[1] = (UBYTE *) AllocMem(TBSize, bufmemtype | MEMF_CLEAR);
if (!TapeBuff[0] || !TapeBuff[1]) {
freestuff();
opmode=CLOSED;
returnpkt(DOSFALSE,ERROR_NO_FREE_STORE);
Mprintf("Can't get %lu bytes for tape buffers\n",TBSize*2);
break;
}
if(opmode<=WRITING) {
/* Check device ready */
if(x=TapeIO(TREADY,0,CTLWAIT)) {
y=DoSense(x);
if(y==UAT) {
blknum = filenum = reserved; lastwrtn = -1;
if(reten) if(x=TapeIO(TRETEN,0,CTLWAIT)) DoSense(x);
}
else if(y==NOS) ;
else if(y==ILL) ;
else {
GIVEUP:
freestuff();
opmode=CLOSED;
filenum = lastwrtn = -1;
returnpkt(DOSFALSE,ERROR_DEVICE_NOT_MOUNTED);
break;
}
}
/* Check write-prot, block length */
if(x=TapeIO(MDSNS,0,CTLWAIT)) DoSense(x);
else {
if(opmode==WRITING && (sns[2] & 0x80)) {
freestuff();
opmode=CLOSED;
returnpkt(DOSFALSE,ERROR_DISK_WRITE_PROTECTED);
break;
}
if(sns[3] >= 8) {
x = *((long *) &sns[8]) & 0x00ffffff; /* get block len */
if(x != blksize) { /* set block size with Mode Select */
Mprintf("Current block size = %lu\n",x);
if(x=TapeIO(MDSET,varblk,CTLWAIT)) DoSense(x);
else TapeIO(TSENSE,0,CTLWAIT);
}
}
}
/* position the medium at starting spot */
if(position==POSNREW) gotopos=blknum;
if(postape(position,fmarks,gotopos)) goto GIVEUP;
/* Get capacity for 3M tape */
if(DAC) {
tpsize = 0x7fffffff;
if(TapeIO(RDCAP,0,CTLWAIT)) TapeIO(TSENSE,0,CTLWAIT);
else {
tpsize = (((long)sns[2] << 8) | sns[3]) + 1;
Mprintf("Capacity: %ld blocks\n", tpsize);
}
Mprintf("%s Opened at block %lu\n",devname,blknum);
}
else Mprintf("%s Opened at file %ld\n",devname,filenum);
}
FASTOPEN:
dirty=FALSE; inprog=FALSE; Boff=0; pkcnt=0; tapenum=1;
iostat=0; Bn=0; remain=TBSize; current=0; atend=eot=rderr=FALSE;
returnpkt(DOSTRUE,0);
break;
case ACTION_END: /*----------- Close() -----------*/
dcnt=DOSTRUE; mcnt=0; iostat=0;
switch(opmode) {
case WRITING:
if(inprog) iostat = TapeIO(TFINISH,0,CTLWAIT);
if(iostat) iostat = wrteot(Bn^1,1,iostat);
if(iostat==0) {
if(dirty) {
memset(TapeBuff[Bn]+Boff,0,remain);
iostat = TapeIO(TWRITE,Bn,CTLWAIT);
}
if(iostat) iostat = wrteot(Bn,0,iostat);
}
if(iostat) { dcnt=DOSFALSE; Mprintf("Error during write\n"); }
else if(pkcnt) {
blknum += actual; x=0;
if(SEQ) {
x=TapeIO(WFMARK,fmarks,CTLWAIT);
lastwrtn = filenum++;
} else filenum = blknum;
if(x) DoSense(x);
}
break;
case READING:
if(inprog) iostat = TapeIO(TFINISH,0,CTLWAIT);
if(iostat) { if(FMK==DoSense(iostat)) atend=TRUE; }
if(DAC) filenum = blknum;
else filenum = atend ? filenum+1 : -1 ;
lastwrtn = -1;
break;
case RAWMODE:
if(x=TapeIO(RAWCMD,Bn,CTLWAIT)) DoSense(x); break;
case UMODSEL:
if(x=TapeIO(USRMODE,Bn,CTLWAIT)) DoSense(x); break;
case CLOSED:
dcnt=DOSFALSE; mcnt=ERROR_ACTION_NOT_KNOWN; break;
case CURRPOS: break;
}
returnpkt(dcnt,mcnt);
freestuff();
if(starting) starting=FALSE;
else if(opmode<=WRITING) {
Mprintf("Closed at block %lu, next file= %ld\n\n",
blknum,filenum);
if(rewcl) if(x=(TapeIO(TREWIND,0,CTLWAIT))) DoSense(x);
if(eject) if(x=(TapeIO(TEJECT,0,CTLWAIT))) DoSense(x);
}
opmode=CLOSED;
break;
case ACTION_READ: /*------- Read(), Seek() --------*/
case ACTION_SEEK:
if(opmode!=READING && opmode!=CURRPOS) {
Mprintf("Function/mode error\n");
res1 = -1;
goto RDEND;
}
if(opmode==CURRPOS && !atend) { /* reading file position */
remain = 1 + sprintf(TapeBuff[Bn],"%ld",filenum);
dirty=atend=TRUE;
}
if(mypkt->dp_Type == ACTION_READ) {
dptr = (UBYTE *) mypkt->dp_Arg2;
dcnt = res1 = mypkt->dp_Arg3;
rcnt = 0;
}
else { /* ACTION_SEEK */
if(opmode==CURRPOS) goto BADSEEK;
rcnt = -1;
dcnt = mypkt->dp_Arg2; /* offset */
x = mypkt->dp_Arg3; /* type */
if(atend || eot || varblk) goto BADSEEK;
if(x==OFFSET_END) goto BADSEEK;
if(x==OFFSET_BEGINNING) dcnt -= current;
/* x==OFFSET_CURRENT, dcnt is correct */
res1 = current;
if(dcnt<0) { /* backwards seek, must be to BOF */
if((dcnt+current)==0) {
if(SEQ && position == POSNREW) goto BADSEEK;
if((dcnt+Boff)<0) { /* still in buffer? */
if(inprog) TapeIO(TFINISH,0,CTLWAIT);
if(postape(position,fmarks,gotopos)) goto BADSEEK;
dirty=FALSE; Bn=0;
}
current=0; dcnt=0; Boff=0; remain=TBSize;
}
else {
BADSEEK:
Mprintf("Disallowed seek type=%ld off=%ld curr=%ld\n",
x,dcnt,current);
res1 = -1;
goto RDEND;
}
}
}
while(dcnt) {
if(!dirty) { /* need to prefetch first buffer */
iostat = TapeIO(TREAD,Bn,CTLWAIT);
remain=0; Bn=1; dirty=TRUE;
}
if(remain==0) { /* current buffer exhausted */
if(rderr) {
Mprintf("Error during read\n");
if(errec)
if(ask(" Ignore READ ERROR?", "IGNORE", "FAIL"))
rderr=FALSE;
if(rderr) { res1 = -1; goto RDEND; }
}
if(eot) { /* end-of-tape */
TapeIO(TREWIND,0,CTLWAIT);
if(NewTape()) {
iostat=TapeIO(TREAD,(Bn^1),CTLWAIT);
eot=atend=FALSE;
}
else atend=TRUE;
}
if(atend) { res1 = rcnt; goto RDEND; }
if(inprog) iostat = TapeIO(TFINISH,0,CTLWAIT);
if(iostat) /* check status of previous read */
switch(DoSense(iostat)) {
case EOM: eot=TRUE; /* & fall thru */
case FMK: atend=TRUE; /* & fall thru */
case RCV: break;
default: rderr=TRUE;
}
remain = actual;
blknum += actual/blksize; /* numblks; */
if(!(atend || eot || rderr)) /* start refilling this buffer */
iostat = TapeIO(TREAD,Bn,Ctl);
Bn ^= 1; /* switch to other (full) buffer */
Boff = 0;
if(bswap) swapbytes(TapeBuff[Bn]);
}
mcnt = (dcnt>remain) ? remain : dcnt;
if(mypkt->dp_Type == ACTION_READ) {
memcpy (dptr, TapeBuff[Bn]+Boff, mcnt);
rcnt += mcnt ;
}
dcnt -= mcnt ;
Boff += mcnt ;
dptr += mcnt ;
current += mcnt;
remain -= mcnt ;
}
RDEND:
returnpkt(res1,0);
break;
case ACTION_WRITE: /*----------- Write() -----------*/
if(opmode < WRITING) {
Mprintf("Function/mode error\n");
res1 = -1;
goto WRTEND;
}
pkcnt++;
dptr = (UBYTE *) mypkt->dp_Arg2;
dcnt = res1 = mypkt->dp_Arg3;
while (dcnt) {
if(dcnt >= remain) {
memcpy (TapeBuff[Bn]+Boff, dptr, remain);
if(inprog) iostat = TapeIO(TFINISH,0,CTLWAIT);
if(iostat) /* check status of previous write */
if(iostat = wrteot(Bn^1,1,iostat)) { /* possible EOT */
Mprintf("Error during write\n");
if(errec)
if(ask(" Ignore WRITE ERROR?", "IGNORE", "FAIL"))
iostat=0;
if(iostat) {
res1 = -1;
iostat=0; dirty=FALSE; pkcnt=0;
goto WRTEND;
}
}
Boff += remain;
iostat = TapeIO(TWRITE,Bn,Ctl); /* start writing full buffer */
blknum += actual;
dcnt -= remain;
dptr += remain;
Boff = 0;
remain= TBSize;
Bn ^= 1; /* switch to other (empty) buffer */
dirty = FALSE;
}
else {
memcpy (TapeBuff[Bn]+Boff, dptr, dcnt);
remain -= dcnt;
Boff += dcnt;
dcnt = 0;
dirty = TRUE;
}
}
WRTEND:
returnpkt(res1,0);
break;
case ACTION_IS_FILESYSTEM: /* DOS 2+ only */
dos2 = TRUE;
returnpkt(DOSFALSE,0);
break;
case ACTION_CURRENT_VOLUME:
returnpkt(dvnode,0);
break;
case ACTION_FLUSH: /* flush buffers, NOOP */
returnpkt(DOSTRUE,0);
break;
case ACTION_LOCATE_OBJECT: /* lock */
if(dos2) returnpkt(DOSFALSE,ERROR_ACTION_NOT_KNOWN);
else returnpkt(mypkt->dp_Arg1,0);
break;
case ACTION_FREE_LOCK: /* unlock */
if(dos2) returnpkt(DOSFALSE,ERROR_ACTION_NOT_KNOWN);
else returnpkt(DOSTRUE,0);
break;
case ACTION_SET_PROTECT: /* SetProtection */
case ACTION_DISK_INFO: /* info */
returnpkt(DOSFALSE,ERROR_ACTION_NOT_KNOWN);
break;
default: /* others not supported */
returnpkt(DOSFALSE,ERROR_ACTION_NOT_KNOWN);
Mprintf("Unsupported_Pkt=%ld\n",mypkt->dp_Type);
} /* end of switch */
} /* end of loop */
} /* end of _main() */
/**************************************************************************/
int DoSense(long iocode)
{
UBYTE snskey;
static char *snstext[] = {
"NONE" , "RECOVERED ERROR", "NOT READY", "MEDIUM ERROR",
"HARDWARE ERROR", "ILLEGAL REQUEST", "UNIT ATTENTION", "DATA PROTECT",
"BLANK CHECK", "KEY=9", "COPY ABORTED", "ABORTED COMMAND", "KEY=C",
"VOLUME OVERFLOW", "KEY=E", "KEY=F", "FILEMARK", "END-OF-MEDIUM",
"INCORRECT BLOCK LENGTH"
};
static char *sderror[] = {
"SELF-UNIT", "DMA", "PHASE", "PARITY", "SELECT-TIMEOUT", "BADSTATUS"
};
if(iocode==0 || iocode==HFERR_BadStatus) {
TapeIO(TSENSE,0,CTLWAIT);
if((sns[0] & 0x70)==0x70) { /* extended */
snskey = sns[2] & 0x0f; /* real sense key */
if(snskey==0) { /* pseudo sense keys */
if(sns[2] & 0x20) snskey = ILI;
if(sns[2] & 0x80) snskey = FMK;
if(sns[2] & 0x40) snskey = EOM;
}
}
else snskey = sns[0] & 0x0f; /* non-extended */
linktp->sense = snstext[snskey]; /* keep last error info */
linktp->xsns1 = sns[12];
linktp->xsns2 = sns[13];
linktp->sns = sns; /* flag for tapemon to print all data */
Mprintf("Sense: %s, other= %02X,%02X\n", snstext[snskey], sns[12],sns[13]);
linktp->sns = NULL;
return((int)snskey);
}
else if(iocode==FAKEOM) return(EOM); /* DAC only */
else {
if(iocode>=40 && iocode<=45)
Mprintf("SCSI %s ERROR\n",sderror[iocode-40]);
else Mprintf("SCSI DRIVER ERROR CODE %lu\n",iocode);
return(SERR);
}
}
/**************************************************************************/
/* postape(): position the tape medium at the place we want to open it
*/
int postape(int how, int fm, long where)
{
long x; int y=0; BOOL slow=TRUE;
switch(how) {
case POSNREW: /* TAPE:* */
if(filenum>=0) {
if(SEQ) blknum = 0;
break;
} /* else pos unknown, fall thru and rewind */
case POSREW: /* TAPE: */
if(x=TapeIO(TREWIND,0,CTLWAIT)) y=DoSense(x);
blknum = reserved;
break;
case POSAPP: /* TAPE:APP */
if(x=TapeIO(TSKIPE,0,CTLWAIT)) y=DoSense(x);
if(lastwrtn<0) filenum = -1;
slow=FALSE; /* & fall thru */
case POSEND: /* TAPE:END */
if((slow && lastwrtn<0) || y==ILL) {
/* drive doesn't support skip-eod, or tape:end */
y=0;
if(!slow) Mprintf("(doing it the hard way)\n");
if(x=TapeIO(TREWIND,0,CTLWAIT)) DoSense(x);
while(y==0) { /* skip files until we hit a blank spot */
Mprintf("Skipping over file %ld\n",filenum);
if(x=TapeIO(TSKIPF,fm,CTLWAIT)) y=DoSense(x);
if(y==FMK) y=0;
filenum++;
}
if(y==BLC) { y=0; filenum--; }
}
blknum = 0;
break;
case POSSKIP: /* TAPE:n */
if(DAC) blknum = where;
else { /* SEQ */
if(x=TapeIO(TREWIND,0,CTLWAIT)) { y=DoSense(x); break; }
if(fm==0) break;
Mprintf("Skipping to file %ld\n",where);
if(x=TapeIO(TSKIPF,where*fm,CTLWAIT)) y=DoSense(x);
if(y==FMK) y=0;
blknum = 0;
}
filenum = where;
lastwrtn = -1;
break;
}
if(y) Mprintf("Unable to position tape\n");
return(y);
}
/**************************************************************************/
/* wrteot: handle messiness that happens when writing at end of tape.
Returns non-zero status if not EOT or tape swap unsuccessful. */
long wrteot(int bfn, int dec, long stat)
{
extern long actual;
long saveboff, nn;
long residue=0;
long ios = stat;
int s = DoSense(ios);
if(s==EOM || s==VOF) { /* EOT? */
if(s==VOF && (sns[0]&0xF0)==0xF0) residue = ((long)sns[5]<<8) + sns[6];
if(residue) Mprintf("Holding %ld unwritten blocks\n",residue);
if(residue>numblks) { Mprintf("OOPS, data lost!\n"); residue=0; }
TapeIO(TREWIND,0,CTLWAIT);
if(NewTape()) { /* ask for new tape */
/* shift unwritten bytes to start of buffer and rewrite on new tape */
if(residue) {
nn = (numblks-residue)*blksize;
saveboff = Boff;
Boff = residue*blksize;
if(nn) memmove(TapeBuff[bfn],TapeBuff[bfn]+nn,Boff);
blknum = reserved;
ios=TapeIO(TWRITE,bfn,CTLWAIT);
if(ios) s=DoSense(ios);
blknum += actual;
Boff = saveboff;
}
else ios=0;
}
}
if(s==RCV) ios=0; /* ignore recoveries */
return(ios);
}
/**************************************************************************/
void freestuff(void)
{
if(TapeBuff[0]) FreeMem(TapeBuff[0],TBSize);
if(TapeBuff[1]) FreeMem(TapeBuff[1],TBSize);
TapeBuff[0] = TapeBuff[1] = NULL;
return;
}
/**************************************************************************/
/* getstart:
Given pointer (z) to a string of the form "SS-nn/..."
returns a number corresponding to SS, the binary value of nn,
and the pointer is updated to point after the slash.
*/
int getstart(long *num)
{
extern char *z;
#define NOTFND 99
#define ENDLST 100
#define NKEYS 19 /* number of keywords */
static char *keys[NKEYS] =
{ "UN","BS","NB","RB","BT","FM","ER","OV","DF","C9",
/* 0 1 2 3 4 5 6 7 8 9 */
"NR","RT","RC","EC","SW","RO","AO","MR","DB"};
/* 10 11 12 13 14 15 16 17 18 */
char *ii, *jj; int kk;
if (*z == '\0') return(ENDLST); /* return if end of string */
for (ii=z; *ii != '-'; ii++); /* find the dash */
for (jj=z; *jj != '/' && *jj !='\0'; jj++); /* find the slash */
*ii = '\0'; *jj = '\0'; /* null-terminate name & number */
*num = (long) strtoul (++ii,NULL,0); /* return converted number */
ii = z; z = ++jj; /* update ptr to next item */
for (kk=0; kk <= NKEYS; kk++) { /* search for keyword */
if (*ii == *keys[kk] && *(ii+1) == *(keys[kk]+1) )
return(kk); /* return index of keyword if found */
}
return(NOTFND); /* didn't find keyword */
}
/**************************************************************************
Mprintf requests that the TapeMon program print the message in 'dbb'.
Since this handler cannot do DOS I/O, it must beg the TapeMon program,
possibly running in a CLI somewhere, to do the printf for it. If the
TapeMon is running, it will have sent us a message containing the port
pointer for TapeMon, so we can send messages to it.
*/
void Mprintf(char *format, ...)
{
va_list ap;
va_start(ap,format);
if(monport) {
if(mbusy) { /* still waiting for reply from tapemon? Wait.*/
WaitPort(btnport);
GetMsg(btnport);
}
vsprintf(linktp->dbb,format,ap);
monmsg.mptr = linktp;
PutMsg(monport,&monmsg.bmsg);
mbusy=TRUE;
}
va_end(ap);
return;
}
/**************************************************************************/
/* toUPPER: convert string to upper case */
void toUPPER(char *zz)
{
for(; *zz != '\0'; zz++) if(*zz >= 'a') *zz -= 0x20;
return;
}
/**************************************************************************
/* swapbytes: swap byte pairs */
void swapbytes(char *zz)
{
char x;
int n;
long len = TBSize/2;
for(n=0; n<len; n++) {
x = *zz;
*zz = *(zz+1);
*(zz+1) = x;
zz += 2;
}
return;
}
/**************************************************************************
* NewTape() Handles transition to a new tape.
*/
long NewTape(void)
{
long choice,s,t,v;
static char rqm[40];
Mprintf("Time to insert tape# %d\n",++tapenum);
sprintf(rqm," Insert tape %d for %s",tapenum,devname);
do {
s=NOS;
choice= ask(rqm," Continue ", " Quit ");
if(choice)
do {
if(t=TapeIO(TREADY,0,CTLWAIT)) s=DoSense(t); /* eat unit-atten */
else s=NOS;
if(s==UAT && reten) if(v=TapeIO(TRETEN,0,CTLWAIT)) DoSense(v);
} while(s==UAT);
} while(s!=NOS);
if(choice) {
if(s=TapeIO(TREWIND,0,CTLWAIT)) DoSense(s);
if(DAC) blknum=reserved; /* reset block number */
}
return(choice);
}
/**************************************************************************
* ask() Displays a yes/no requester.
*/
long ask(char *txt, char *yes, char *no)
{
#define ITXT { AUTOFRONTPEN,AUTOBACKPEN,AUTODRAWMODE,AUTOLEFTEDGE, \
AUTOTOPEDGE, AUTOITEXTFONT, NULL, NULL }
static struct IntuiText rtxt[3] = { ITXT, ITXT, ITXT };
if(!IntuitionBase) return(0);
rtxt[0].IText = (UBYTE *) txt;
rtxt[1].IText = (UBYTE *) yes;
rtxt[2].IText = (UBYTE *) no;
return(AutoRequest(NULL,&rtxt[0],&rtxt[1],&rtxt[2],NULL,NULL,300,50));
}
/**************************************************************************
* returnpkt() - reply DOS packet.
* Adapted from "misc.c" code by Phillip Lindsay (C) Commodore 1986
*/
void returnpkt(ULONG res1, ULONG res2)
{
struct Message *mess;
struct MsgPort *replyport;
#ifdef DBUG
if(dbug) Mprintf("REPLY %08X %08X\n", res1, res2);
#endif
mypkt->dp_Res1 = res1;
mypkt->dp_Res2 = res2;
replyport = mypkt->dp_Port;
mess = mypkt->dp_Link;
mypkt->dp_Port = &myproc->pr_MsgPort;
mess->mn_Node.ln_Name = (char *) mypkt;
mess->mn_Node.ln_Succ = NULL;
mess->mn_Node.ln_Pred = NULL;
PutMsg(replyport,mess);
}