dillon@CORY.BERKELEY.EDU (Matt Dillon) (10/23/87)
Thanks to Steve Beats and Andy Finkel, I've gotten ACTION_INFO working properly. Here's the update... plus the docs which somehow got left out of the original distribution. -Matt #! /bin/sh # This is a shell archive, meaning: # 1. Remove everything above the #! /bin/sh line. # 2. Save the resulting text in a file. # 3. Execute the file with /bin/sh (not csh) to create: # DOSDEV.DOC # Makefile # bset.asm # device.c # device.uue # dos.h # flush.c # mountlist # This archive created: Thu Oct 22 16:16:12 1987 export PATH; PATH=/bin:/usr/bin:$PATH echo shar: "extracting 'DOSDEV.DOC'" '(3865 characters)' if test -f 'DOSDEV.DOC' then echo shar: "will not over-write existing file 'DOSDEV.DOC'" else cat << \!Funky!Stuff! > 'DOSDEV.DOC' DOS device driver example for AZTEC C By Matthew Dillon ... for all those people out there (including me!) who have been struggling with DOS devices. Placed in PUBLIC DOMAIN. Documentation is sorely lacking... even the RKM examples are sorely lacking. What programmers need is a working example ... as full an implementation as possible to figure out all the little DOS quirks that the manuals don't tell you about... Little things like when the driver stores a string in a structure it must be in BCPL 'length first' format. There are literally hundreds of these babies! REQUIREMENTS: -Aztec C compiler -A precompiled symbol table of all sub-directory include's (*/*.H). i.e. one which does NOT include top level stuff like <stdio.h>. Remember to compile with the +L option when generating the symbol table. The LARGE data and code model will be used... It makes life *much* easier. This will NOT effect performance as there are very few global elements anyway. *Alternately, no requirements if you just want to look at the source. MOUNTLIST: You will want to change this to a more permanent file path, obviously, though to run the example you might as well leave the driver in RAM: THE EXAMPLE: How 'bout a RAM disk? RAM disks use most DOS packet types... Since my RAM disk is not meant for normal usage, There will be a lot of minor items I will leave unimplimented: -Date stamps are not kept up. In fact, they are garbage. -I don't check out-of-memory conditions (remember! This is ONLY an example!) -The driver EXIT's if no files exist and no references exist. This allows you to FLUSH (make flush), which should remove all knowlege of the driver allowing you to make source changes, recompile, and re-reference without changing the name or rebooting. Normally, disk-like devices are permanent fixtures. -The ARCHIVE protection bit is not supported All packet types normally associated with a RAM disk are supported, Most especially LOCKS, which *many* people have not been able to figure out in the past. DEBUGGING: Since this is an example, FULL Debugging has been implemented. Since the DOS device driver cannot make DOS library calls itself (confusion on the message port), CreatProc() is used to create a secondary process which will do actual printing of the debugger messages. The messages are then sent to the debug process via a dedicated message port. Since Debugging causes a huge efficiency decrease, and since you are going to want to fool around with the device, you can turn off debug error message output by: CD test: type debugoff (will get an error, but debugging will be turned off) alternately, 'type debugon' will turn it back on. The debugging code itself is a good example. DOS: Remember that most addresses are passed as BPTR's, and most strings are passed as BPTR's to a BSTR (length in byte 0, string in bytes 1..N, no 'end' bytes). The exceptions are obvious by looking at the code (at least of the packet types supported). DOS PECULARITIES NOT ADDRESSED: Newcli assumes it can open the file '*' on whatever device you specify for the control terminal to get a duplicate stream. This is how it gets around CON-like devices which like to create separate processes for each invocation. ACTION_DISK_INFO, when sent to a CONSOLE device, will return the window associated with the console as follows: id_VolumeNode = console window id_InUse = console IO blvock There are probably many more. Matthew Dillon ARPA: dillon@ucbvax.berkeley.edu UUCP: ..!ihnp4!ucbvax!dillon SNAIL: Matthew Dillon 891 Regal Rd. Berkeley, Ca. 94708 !Funky!Stuff! fi # end of overwriting check echo shar: "extracting 'Makefile'" '(237 characters)' if test -f 'Makefile' then echo shar: "will not over-write existing file 'Makefile'" else cat << \!Funky!Stuff! > 'Makefile' CFLAGS= +BCDL +Ivd0:include/symbols.m OBJS= device.o bset.o .c.o: cc $(CFLAGS) $*.c all: $(OBJS) ln +Q $(OBJS) -lcl32 -O ram:device flush: cc +L +Ivd0:include/symbols.m flush.c -o ram:flush.o ln +Q ram:flush.o -lc32 !Funky!Stuff! fi # end of overwriting check echo shar: "extracting 'bset.asm'" '(1076 characters)' if test -f 'bset.asm' then echo shar: "will not over-write existing file 'bset.asm'" else cat << \!Funky!Stuff! > 'bset.asm' ;BSET.ASM ;BZERO.ASM ; ; Uses longword operations if data is aligned on a longword boundry ; and the size is a mulitple of 4. Otherwise, uses byte operations. xdef _bset xdef _bzero _bzero clr.l D1 bra begin _bset move.b 15(A7),D1 ;12(A7)-> msb . . lsb (D1 = data) begin move.l 4(A7),A0 ;A0 = address move.l 8(A7),D0 ;D0 = byte count andi.b #3,11(A7) ;byte count on long word boundry? bne drop andi.b #3,7(A7) ;address on longword boundry? bne drop bra lwb loop move.b D1,(A0)+ ;BYTE SET LOOP drop dbf.w D0,loop ;remember, only effects lower word sub.l #$10000,D0 ;for buffers >65535 bpl loop ;branch to loop because D0.W now is FFFF rts lwb lsr.l #2,D0 ;byte count / 4 (longword chunks) tst.l D1 ;BZERO beq dropl move.b D1,14(A7) ;15(A7) already contains the byte move.w 14(A7),D1 ;D1 0..15 set swap D1 move.w 14(A7),D1 ;D1 16..31 set bra dropl loopl move.l D1,(A0)+ ;BYTE SET LOOP dropl dbf.w D0,loopl ;remember, only effects lower word sub.l #$10000,D0 ;for buffers >65535 bpl loopl ;branch to loop because D0.W now is FFFF rts !Funky!Stuff! fi # end of overwriting check echo shar: "extracting 'device.c'" '(27017 characters)' if test -f 'device.c' then echo shar: "will not over-write existing file 'device.c'" else cat << \!Funky!Stuff! > 'device.c' /* * DOSDEVICE.C * * EXAMPLE DOS DEVICE DRIVER FOR AZTEC.C PUBLIC DOMAIN. * * By Matthew Dillon. * * Debugging routines are disabled by simply attempting to access the * file "debugoff" */ #include "dos.h" /* * Since this code might be called as a processes multiple times, or * might exit and be recalled later by DOS, you CANNOT ASSUME GLOBALS * HAVE BEEN ZERO'D!!!. This also goes for static assignments that * running the code might change. */ PROC *DosProc; DEVNODE *DosNode; long SysBase; long DOSBase; RAMFILE RFRoot; /* Directory/File structure (root node) */ LIST FHBase; /* Open Files */ LIST LCBase; /* Open Locks */ long TotalBytes; /* DEBUGGING */ PORT *Dbport; /* owned by the debug process */ PORT *Dback; /* owned by the DOS device driver */ short DBDisable; MSG DummyMsg; void noname() { register PACKET *packet; register short error; MSG *msg; ubyte notdone; ubyte buf[256]; void *tmp; /* * Initialize all global variables. SysBase MUST be initialized before * we can make Exec calls. AbsExecBase is a library symbol * referencing absolute memory location 4. The DOS library is openned * for the debug process. */ DBDisable = 0; Dbport = Dback = NULL; TotalBytes = 0; SysBase = AbsExecBase; DOSBase = OpenLibrary("dos.library",0); DosProc = FindTask(NULL); { WaitPort(&DosProc->pr_MsgPort); /* Startup Packet */ msg = GetMsg(&DosProc->pr_MsgPort); packet = (PACKET *)msg->mn_Node.ln_Name; /* * Loading DosNode->dn_Task causes DOS *NOT* to startup a new * instance of the device driver for every reference. E.G. if * you were writing a CON device you would want this field to * be NULL. */ if (DOSBase) { DosNode = BTOC(packet->dp_Arg3); DosNode->dn_Task = &DosProc->pr_MsgPort; packet->dp_Res1 = DOS_TRUE; packet->dp_Res2 = 0; } else { packet->dp_Res1 = DOS_FALSE; returnpacket(packet); return; } returnpacket(packet); } /* DEBUGGING */ dbinit(); /* this can be removed */ /* Initialize RAM disk */ { ubyte *ptr = BTOC(DosNode->dn_Name); short len = *ptr; NewList(&FHBase); NewList(&LCBase); bzero(&RFRoot,sizeof(RFRoot)); RFRoot.type = FILE_DIR; NewList(&RFRoot.list); RFRoot.name = AllocMem(len+1, MEMF_PUBLIC); bmov(ptr+1,RFRoot.name,len); RFRoot.name[len] = 0; dbprintf("ROOT NAME: %ld '%s'\n", len, RFRoot.name); } top: for (notdone = 1; notdone;) { WaitPort(&DosProc->pr_MsgPort); stats(); while (msg = GetMsg(&DosProc->pr_MsgPort)) { register ubyte *ptr; packet = (PACKET *)msg->mn_Node.ln_Name; packet->dp_Res1 = DOS_TRUE; packet->dp_Res2 = 0; error = 0; dbprintf("Packet: %3ld %08lx %08lx %08lx %08lx\n", packet->dp_Type, packet->dp_Arg1, packet->dp_Arg2, packet->dp_Arg3, packet->dp_Arg4 ); switch(packet->dp_Type) { case ACTION_DIE: /* attempt to die? */ notdone = 0; break; case ACTION_OPENRW: /* FileHandle,Lock,Name Bool */ case ACTION_OPENOLD: /* FileHandle,Lock,Name Bool */ case ACTION_OPENNEW: /* FileHandle,Lock,Name Bool */ { register RAMFILE *ramfile; RAMFILE *parentdir = getlockfile(packet->dp_Arg2); char *ptr; btos(packet->dp_Arg3,buf); if (strcmp(buf,"debugoff") == 0) DBDisable = 1; if (strcmp(buf,"debugon") == 0) DBDisable = 0; if (ramfile = searchpath(&parentdir,buf,&ptr)) { dbprintf("Found: parentdir %08lx tail '%s'\n", parentdir, ptr); if (ramfile->type == FILE_DIR) { error = ERROR_OBJECT_WRONG_TYPE; goto openbreak; } if (ramfile->locks < 0) { error = ERROR_OBJECT_IN_USE; goto openbreak; } if (packet->dp_Type == ACTION_OPENOLD) { ++ramfile->locks; } else { if (ramfile->locks > 0) { error = ERROR_OBJECT_IN_USE; } else { if (packet->dp_Type == ACTION_OPENNEW) freedata(ramfile); --ramfile->locks; } } } else { dbprintf("Not found.."); if (!parentdir) { error = ERROR_INVALID_COMPONENT_NAME; goto openbreak; } if (packet->dp_Type == ACTION_OPENNEW) { ramfile = createramfile(parentdir, FILE_FILE, ptr); --ramfile->locks; dbprintf("adding file %08lx '%s'\n", ramfile, ramfile->name); } else { error = ERROR_OBJECT_NOT_FOUND; } } if (!error) { register MYFH *mfh = AllocMem(sizeof(MYFH), MEMF_PUBLIC|MEMF_CLEAR); ((FH *)BTOC(packet->dp_Arg1))->fh_Arg1 = (long)mfh; dbprintf("SET FH-ARG1 to %08lx\n", mfh); mfh->file = ramfile; mfh->fentry = GetHead(&ramfile->list); AddHead(&FHBase,mfh); } } openbreak: if (!GetHead(&FHBase) && !GetHead(&LCBase)) notdone = 0; break; case ACTION_READ: /* FHArg1,CPTRBuffer,Length ActLength */ { register MYFH *mfh = (MYFH *)packet->dp_Arg1; register FENTRY *fen = mfh->fentry; register ubyte *ptr = (ubyte *)packet->dp_Arg2; register long left = packet->dp_Arg3; register long scr; dbprintf("READ Seek:%ld MFH:%08lx FEN:%08lx\n", mfh->base + mfh->offset, mfh, fen); while (left && fen) { scr = fen->bytes - mfh->offset; dbprintf(" %ld bytes avail to read. req %ld\n", scr, left); if (left < scr) { bmov(fen->buf + mfh->offset, ptr, left); mfh->offset += left; left = 0; } else { bmov(fen->buf + mfh->offset, ptr, scr); left -= scr; ptr += scr; mfh->base += fen->bytes; mfh->offset = 0; fen = NextNode(fen); } } mfh->fentry = fen; packet->dp_Res1 = packet->dp_Arg3 - left; } break; case ACTION_WRITE: /* FHArg1,CPTRBuffer,Length ActLength */ { register MYFH *mfh = (MYFH *)packet->dp_Arg1; register FENTRY *fen = (FENTRY *)mfh->fentry; register ubyte *ptr = (ubyte *)packet->dp_Arg2; register long left = packet->dp_Arg3; register long scr; dbprintf("MFH: %08lx\n", mfh); while (left) { if (fen) { dbprintf("WRITE: %ld FEN %ld\n", left, fen->bytes); scr = fen->bytes - mfh->offset; if (left < scr) { bmov(ptr, fen->buf + mfh->offset, left); mfh->offset += left; left = 0; } else { bmov(ptr, fen->buf + mfh->offset, scr); ptr += scr; left -= scr; mfh->base += fen->bytes; mfh->offset = 0; fen = NextNode(fen); } } else { dbprintf("WRITE: %ld NOFEN\n", left); fen = AllocMem(sizeof(FENTRY), MEMF_PUBLIC); fen->buf = AllocMem(left, MEMF_PUBLIC); fen->bytes = left; mfh->file->bytes += left; mfh->base += left; mfh->offset = 0; TotalBytes += left; AddTail(&mfh->file->list, fen); bmov(ptr, fen->buf, left); left = 0; fen = NULL; /* cause append */ } } packet->dp_Res1 = packet->dp_Arg3 - left; mfh->fentry = fen; } break; case ACTION_CLOSE: /* FHArg1 Bool:TRUE */ { register MYFH *mfh = (MYFH *)packet->dp_Arg1; register RAMFILE *file = mfh->file; Remove(mfh); FreeMem(mfh,sizeof(*mfh)); if (--file->locks < 0) file->locks = 0; } if (!GetHead(&FHBase) && !GetHead(&LCBase)) notdone = 0; break; case ACTION_SEEK: /* FHArg1,Position,Mode OldPosition*/ { register MYFH *mfh = (MYFH *)packet->dp_Arg1; register FENTRY *fen; register long absseek; packet->dp_Res1 = mfh->base + mfh->offset; absseek = packet->dp_Arg2; if (packet->dp_Arg3 == 0) absseek += mfh->base + mfh->offset; if (packet->dp_Arg3 == 1) absseek = mfh->file->bytes + absseek; if (absseek < 0 || absseek > mfh->file->bytes) { error = ERROR_SEEK_ERROR; break; } mfh->base = mfh->offset = 0; /* * Stupid way to do it but.... */ for (fen = GetHead(&mfh->file->list); fen; fen = NextNode(fen)) { if (mfh->base + fen->bytes > absseek) { mfh->offset = absseek - mfh->base; break; } mfh->base += fen->bytes; } mfh->fentry = fen; } break; case ACTION_EXAMINE_NEXT: /* Lock,Fib Bool */ { register FIB *fib = BTOC(packet->dp_Arg2); register RAMFILE *file = getlockfile(packet->dp_Arg1); if (file->type == FILE_FILE) { error = ERROR_OBJECT_WRONG_TYPE; break; } if (fib->fib_DiskKey == NULL) { error = ERROR_NO_MORE_ENTRIES; break; } file = (RAMFILE *)fib->fib_DiskKey; fib->fib_DiskKey = (long)NextNode(file); tmp = file; error = -1; } /* fall through */ case ACTION_EXAMINE_OBJECT: /* Lock,Fib Bool */ { register FIB *fib; register RAMFILE *file; fib = BTOC(packet->dp_Arg2); if (error) { file = tmp; } else { file = getlockfile(packet->dp_Arg1); fib->fib_DiskKey = (long)GetHead(&file->list); } error = 0; fib->fib_DirEntryType = file->type; strcpy(fib->fib_FileName+1, file->name); fib->fib_FileName[0] = strlen(file->name); fib->fib_Protection = file->protection; fib->fib_EntryType = NULL; fib->fib_Size = file->bytes; fib->fib_NumBlocks = file->bytes >> 9; fib->fib_Date = file->date; if (file->comment) { strcpy(fib->fib_Comment+1, file->comment); fib->fib_Comment[0] = strlen(file->comment); } else { fib->fib_Comment[0] = 0; } } break; case ACTION_INFO: /* Lock, InfoData Bool:TRUE */ tmp = BTOC(packet->dp_Arg2); error = -1; /* fall through */ case ACTION_DISK_INFO: /* InfoData Bool:TRUE */ { register INFODATA *id; /* * Note: id_NumBlocks is never 0, but only to get * around a bug I found in my shell (where I divide * by id_NumBlocks) */ (error) ? (id = tmp) : (id = BTOC(packet->dp_Arg1)); error = 0; bzero(id, sizeof(*id)); id->id_DiskState = ID_VALIDATED; id->id_NumBlocks = (TotalBytes >> 9) + 1; id->id_NumBlocksUsed = (TotalBytes >> 9) + 1; id->id_BytesPerBlock = 512; id->id_DiskType = ID_DOS_DISK; id->id_VolumeNode = (long)CTOB(DosNode); id->id_InUse = (long)GetHead(&LCBase); } break; case ACTION_PARENT: /* Lock ParentLock */ { register RAMFILE *file = getlockfile(packet->dp_Arg1); if (file->type == FILE_FILE) { error = ERROR_OBJECT_NOT_FOUND; break; } if (file->locks < 0) { error = ERROR_OBJECT_IN_USE; break; } if (file->parent) packet->dp_Res1 = (long)CTOB(ramlock(file->parent, ACCESS_READ)); else error = ERROR_OBJECT_NOT_FOUND; } break; case ACTION_DELETE_OBJECT: /*Lock,Name Bool */ { RAMFILE *parentdir = getlockfile(packet->dp_Arg1); RAMFILE *ramfile; btos(packet->dp_Arg2, buf); if (ramfile = searchpath(&parentdir,buf,NULL)) { if (ramfile->locks || ramfile == &RFRoot) { error = ERROR_OBJECT_IN_USE; break; } if (ramfile->type == FILE_DIR) { if (GetHead(&ramfile->list)) error = ERROR_DIRECTORY_NOT_EMPTY; } else { freedata(ramfile); } if (!error) freeramfile(ramfile); } else { if (!parentdir) error = ERROR_INVALID_COMPONENT_NAME; else error = ERROR_OBJECT_NOT_FOUND; } } if (!GetHead(&FHBase) && !GetHead(&LCBase)) notdone = 0; break; case ACTION_CREATE_DIR: /* Lock,Name Lock */ { RAMFILE *parentdir = getlockfile(packet->dp_Arg1); RAMFILE *ramfile; char *ptr; btos(packet->dp_Arg2, buf); if (ramfile = searchpath(&parentdir,buf,&ptr)) { error = ERROR_OBJECT_EXISTS; break; } if (!parentdir) { error = ERROR_INVALID_COMPONENT_NAME; break; } ramfile = createramfile(parentdir, FILE_DIR, ptr); packet->dp_Res1 = (long)CTOB(ramlock(ramfile, ACCESS_WRITE)); } break; case ACTION_LOCATE_OBJECT: /* Lock,Name,Mode Lock */ { RAMFILE *parentdir = getlockfile(packet->dp_Arg1); RAMFILE *ramfile; btos(packet->dp_Arg2, buf); if (ramfile = searchpath(&parentdir,buf,NULL)) { if (ramfile->locks < 0 || (ramfile->locks && packet->dp_Arg3 == ACCESS_WRITE)) { error = ERROR_OBJECT_IN_USE; break; } packet->dp_Res1 = (long)CTOB(ramlock(ramfile, packet->dp_Arg3)); } else { if (!parentdir) error = ERROR_INVALID_COMPONENT_NAME; else error = ERROR_OBJECT_NOT_FOUND; } } break; case ACTION_COPY_DIR: /* Lock, Lock */ { register RAMFILE *ramfile = getlockfile(packet->dp_Arg1); if (ramfile->locks < 0) error = ERROR_OBJECT_IN_USE; else packet->dp_Res1 = (long)CTOB(ramlock(ramfile, ACCESS_READ)); } break; case ACTION_FREE_LOCK: /* Lock, Bool */ if (packet->dp_Arg1); ramunlock(BTOC(packet->dp_Arg1)); if (!GetHead(&FHBase) && !GetHead(&LCBase)) notdone = 0; break; case ACTION_SET_PROTECT:/* -,Lock,Name,Mask Bool */ { register RAMFILE *ramfile; RAMFILE *parentdir = getlockfile(packet->dp_Arg2); char *ptr; btos(packet->dp_Arg3, buf); if (ramfile = searchpath(&parentdir,buf,&ptr)) { ramfile->protection = packet->dp_Arg4; } else { if (parentdir) error = ERROR_OBJECT_NOT_FOUND; else error = ERROR_INVALID_COMPONENT_NAME; } } break; case ACTION_SET_COMMENT:/* -,Lock,Name,Comment Bool */ { register RAMFILE *ramfile; RAMFILE *parentdir = getlockfile(packet->dp_Arg2); char *ptr; btos(packet->dp_Arg3, buf); if (ramfile = searchpath(&parentdir,buf,&ptr)) { btos(packet->dp_Arg4, buf); if (ramfile->comment) FreeMem(ramfile->comment,strlen(ramfile->comment)+1); ramfile->comment = AllocMem(strlen(buf)+1, MEMF_PUBLIC); strcpy(ramfile->comment, buf); } else { if (parentdir) error = ERROR_OBJECT_NOT_FOUND; else error = ERROR_INVALID_COMPONENT_NAME; } } break; case ACTION_RENAME_OBJECT:/* SLock,SName,DLock,DName Bool */ { register RAMFILE *file1, *file2; RAMFILE *sourcedir = getlockfile(packet->dp_Arg1); RAMFILE *destdir = getlockfile(packet->dp_Arg3); char *ptr; btos(packet->dp_Arg2,buf); if (file1 = searchpath(&sourcedir,buf,NULL)) { btos(packet->dp_Arg4,buf); if (file2 = searchpath(&destdir,buf,&ptr)) { error = ERROR_OBJECT_EXISTS; } else { if (destdir) { Remove(file1); AddTail(&destdir->list, file1); FreeMem(file1->name,strlen(file1->name)+1); file1->name = AllocMem(strlen(ptr)+1,MEMF_PUBLIC); strcpy(file1->name,ptr); } else { error = ERROR_INVALID_COMPONENT_NAME; } } } else { if (sourcedir) error = ERROR_OBJECT_NOT_FOUND; else error = ERROR_INVALID_COMPONENT_NAME; } } break; /* * A few other packet types which we do not support */ case ACTION_RENAME_DISK:/* BSTR:NewName Bool */ case ACTION_MORECACHE: /* #BufsToAdd Bool */ case ACTION_INHIBIT: /* Bool Bool */ case ACTION_WAIT_CHAR: /* Timeout, ticks Bool */ case ACTION_FLUSH: /* writeout bufs, disk motor off */ case ACTION_RAWMODE: /* Bool(-1:RAW 0:CON) OldState */ default: error = ERROR_ACTION_NOT_KNOWN; break; } if (packet) { if (error) { packet->dp_Res1 = DOS_FALSE; packet->dp_Res2 = error; } returnpacket(packet); } } } dbprintf("REMOVING DOS DEVICE"); Delay(50); /* I wanna even see the debug message! */ Forbid(); if (packetsqueued(DosProc) || GetHead(&FHBase) || GetHead(&LCBase) || GetHead(&RFRoot.list)) { Permit(); dbprintf("Not ready to die yet!\n"); goto top; /* sorry... can't exit */ } DosNode->dn_Task = FALSE; dbuninit(); CloseLibrary(DOSBase); } /* * PACKET ROUTINES. Dos Packets are in a rather strange format as you * can see by this and how the PACKET structure is extracted in the * GetMsg() of the main routine. */ void returnpacket(packet) register struct DosPacket *packet; { register struct Message *mess; register struct MsgPort *replyport; replyport = packet->dp_Port; mess = packet->dp_Link; packet->dp_Port = &DosProc->pr_MsgPort; mess->mn_Node.ln_Name = (char *)packet; mess->mn_Node.ln_Succ = NULL; mess->mn_Node.ln_Pred = NULL; PutMsg(replyport, mess); } /* * Are there any packets queued to our device? */ packetsqueued() { return ((void *)DosProc->pr_MsgPort.mp_MsgList.lh_Head != (void *)&DosProc->pr_MsgPort.mp_MsgList.lh_Tail); } /* * DOS MEMORY ROUTINES * * DOS makes certain assumptions about LOCKS. A lock must minimally be * a FileLock structure, with additional private information after the * FileLock structure. The longword before the beginning of the structure * must contain the length of structure + 4. */ void * dosalloc(bytes) register ulong bytes; { register ulong *ptr; bytes += 4; ptr = AllocMem(bytes, MEMF_PUBLIC|MEMF_CLEAR); *ptr = bytes; return(ptr+1); } dosfree(ptr) register ulong *ptr; { --ptr; FreeMem(ptr, *ptr); } /* * Convert a BSTR into a normal string.. copying the string into buf */ void btos(bstr,buf) ubyte *bstr; ubyte *buf; { bstr = BTOC(bstr); bmov(bstr+1,buf,*bstr); buf[*bstr] = 0; dbprintf("btos: %ld %s\n", *bstr, buf); } void * NextNode(node) NODE *node; { node = node->mln_Succ; if (node->mln_Succ == NULL) return(NULL); return(node); } void * GetHead(list) LIST *list; { if ((void *)list->mlh_Head != (void *)&list->mlh_Tail) return(list->mlh_Head); return(NULL); } nccmp(p1,p2,n) register ubyte *p1, *p2; register short n; { while (--n >= 0) { if ((p1[n]|0x20) != (p2[n]|0x20)) return(0); } return(1); } /* * Create a file or directory and link it into it's parent directory. */ RAMFILE * createramfile(parentdir, type, name) RAMFILE *parentdir; char *name; { register RAMFILE *ramfile; ramfile = AllocMem(sizeof(RAMFILE), MEMF_CLEAR|MEMF_PUBLIC); AddTail(&parentdir->list, ramfile); ramfile->parent = parentdir; ramfile->name = AllocMem(strlen(name)+1, MEMF_PUBLIC); strcpy(ramfile->name, name); ramfile->type = type; ramfile->protection = 0; NewList(&ramfile->list); /* SET DATE! */ return(ramfile); } /* * Free all data associated with a file */ void freedata(ramfile) RAMFILE *ramfile; { FENTRY *fen; TotalBytes -= ramfile->bytes; while (fen = RemHead(&ramfile->list)) { FreeMem(fen->buf, fen->bytes); FreeMem(fen, sizeof(*fen)); } ramfile->bytes = 0; } /* * Any data associated with the file or directory has already been * freed up. */ void freeramfile(ramfile) RAMFILE *ramfile; { Remove(ramfile); /* unlink from parent directory */ FreeMem(ramfile->name,strlen(ramfile->name)+1); if (ramfile->comment) FreeMem(ramfile->comment,strlen(ramfile->comment)+1); FreeMem(ramfile,sizeof(*ramfile)); } MYLOCK * ramlock(ramfile, mode) RAMFILE *ramfile; { MYLOCK *lock = dosalloc(sizeof(MYLOCK)); AddHead(&LCBase,&lock->node); lock->lock.fl_Access = mode; lock->lock.fl_Task = &DosProc->pr_MsgPort; lock->lock.fl_Volume = (BPTR)CTOB(DosNode); lock->file = ramfile; if (mode == ACCESS_READ) ++ramfile->locks; else ramfile->locks = -1; return(lock); } void ramunlock(lock) MYLOCK *lock; { RAMFILE *file = lock->file; Remove(&lock->node); if (lock->lock.fl_Access == ACCESS_READ) --file->locks; else file->locks = 0; dosfree(lock); } /* * GETLOCKFILE(bptrlock) * * Return the RAMFILE entry (file or directory) associated with the * given lock, which is passed as a BPTR. * * According to the DOS spec, the only way a NULL lock will ever be * passed to you is if the DosNode->dn_Lock is NULL, but I'm not sure. * In anycase, If a NULL lock is passed to me I simply assume it means * the root directory of the RAM disk. */ RAMFILE * getlockfile(lock) void *lock; /* actually BPTR to MYLOCK */ { if (lock) return(((MYLOCK *)BTOC(lock))->file); return(&RFRoot); } /* * Search the specified path beginning at the specified directory. * The directory pointer is updated to the directory containing the * actual file. Return the file node or NULL if not found. If the * path is illegal (an intermediate directory was not found), set *ppar * to NULL and return NULL. * * *ppar may also be set to NULL if the search path IS the root. * * If pptr not NULL, Set *pptr to the final component in the path. */ RAMFILE * searchpath(ppar,buf,pptr) RAMFILE **ppar; char *buf; char **pptr; { RAMFILE *file = *ppar; RAMFILE *srch; short len; char *ptr; dbprintf("searchpath: '%s'\n", buf); *ppar = NULL; for (;*buf && file;) { ptr = getpathelement(&buf,&len); if (buf[0] == ':') { /* go to root */ dbprintf("colon element\n"); ++buf; file = &RFRoot; continue; } if (*ptr == '/') { /* go back a directory */ if (!file->parent) { /* no parent directory */ dbprintf("Backdir.. no parent\n"); return(NULL); } file = file->parent; dbprintf("backdir: file %08lx (%s)\n", file, file->name); continue; } if (file->type == FILE_FILE) return(NULL); for (srch = GetHead(&file->list); srch; srch = NextNode(srch)) { if (strlen(srch->name) == len && nccmp(srch->name, ptr, len)) { file = srch; /* element found */ break; } } if (srch == NULL) { if (*buf == 0) { /* Element not found. If it was the final */ *ppar = file; /* element the parent directory is valid */ dbprintf("element not found.. ok\n"); } else { dbprintf("element not found.. path error\n"); } if (pptr) *pptr = ptr; return(NULL); } } if (pptr) *pptr = ptr; *ppar = file->parent; dbprintf("DONE. File %08lx (%s) parent %08lx\n", file, file->name, file->parent); return(file); } /* * Return the next path element in the string. The routine effectively * removes any trailing '/'s, but treats ':' as part of the next component * (i.e. ':' is checked and skipped in SEARCHPATH()). */ char * getpathelement(pstr,plen) char **pstr; short *plen; { char *base; register char *ptr = *pstr; register short len = 0; if (*(base = ptr)) { if (*ptr == '/') { ++ptr; ++len; } else { while (*ptr && *ptr != '/' && *ptr != ':') { ++ptr; ++len; } if (*ptr == '/') ++ptr; } } *pstr = ptr; *plen = len; dbprintf("PATH ELEMENT: %ld '%s' next@ '%s'\n", len, base, ptr); return(base); } stats() { register RAMFILE *file; register MYFH *mfh; for (file = GetHead(&RFRoot.list); file; file = NextNode(file)) { dbprintf("Root entry: %08lx %s %ld\n", file, file->name, file->bytes); } for (mfh = GetHead(&FHBase); mfh; mfh = NextNode(mfh)) { dbprintf("Openfile: %08lx %s @%ld %ld\n", mfh->file, mfh->file->name, mfh->base, mfh->offset); } /* * Note that the NODE entry in the MYLOCK structure is not (cannot) be * at the beginning of the structure and thus if you want to traverse * the active lock list you must subtract it's position in the * structure from any list pointers. */ if (GetHead(&LCBase)) { dbprintf("ACTIVE LOCKS DO EXIST\n"); } dbprintf("\n"); } /* * DEBUGGING CODE. You cannot make DOS library calls that access other * devices from within a DOS device driver because they use the same * message port as the driver. If you need to make such calls you must * create a port and construct the DOS messages yourself. I do not * do this. To get debugging info out another PROCESS is created to which * debugging messages can be sent. * * You want the priority of the debug process to be larger than the * priority of your DOS handler. This is so if your DOS handler crashes * you have a better idea of where it died from the debugging messages * (remember that the two processes are asyncronous from each other). */ extern void debugproc(); dbinit() { TASK *task = FindTask(NULL); Dback = CreatePort(NULL,NULL); CreateProc("DEV_DB", task->tc_Node.ln_Pri+1, CTOB(debugproc), 4096); WaitPort(Dback); /* handshake startup */ GetMsg(Dback); /* remove dummy msg */ dbprintf("Debugger running V1.00\n"); } dbuninit() { MSG killmsg; if (Dbport) { killmsg.mn_Length = 0; /* 0 means die */ PutMsg(Dbport,&killmsg); WaitPort(Dback); /* He's dead jim! */ GetMsg(Dback); DeletePort(Dback); /* * Since the debug process is running at a greater priority, I * am pretty sure that it is guarenteed to be completely removed * before this task gets control again. Still, it doesn't hurt... */ Delay(50); /* ensure he's dead */ } } dbprintf(a,b,c,d,e,f,g,h,i,j) { char buf[256]; MSG *msg; if (Dbport && !DBDisable) { sprintf(buf,a,b,c,d,e,f,g,h,i,j); msg = AllocMem(sizeof(MSG)+strlen(buf)+1, MEMF_PUBLIC|MEMF_CLEAR); msg->mn_Length = strlen(buf)+1; /* Length NEVER 0 */ strcpy(msg+1,buf); PutMsg(Dbport,msg); } } /* * BTW, the DOS library used by debugmain() was actually openned by * the device driver. Note: DummyMsg cannot be on debugmain()'s stack * since debugmain() goes away on the final handshake. */ debugmain() { MSG *msg; short len; void *fh; Dbport = CreatePort(NULL,NULL); fh = Open("con:0/0/640/100/debugwindow", 1006); PutMsg(Dback, &DummyMsg); for (;;) { WaitPort(Dbport); msg = GetMsg(Dbport); len = msg->mn_Length; if (len == 0) break; --len; /* Fix length up */ Write(fh, msg+1, len); FreeMem(msg,sizeof(MSG)+len+1); } Close(fh); DeletePort(Dbport); PutMsg(Dback,&DummyMsg); /* Kill handshake */ } /* * The assembly tag for the DOS process: CNOP causes alignment problems * with the Aztec assembler for some reason. I assume then, that the * alignment is unknown. Since the BCPL conversion basically zero's the * lower two bits of the address the actual code may start anywhere * within 8 bytes of address (remember the first longword is a segment * pointer and skipped). Sigh.... (see CreatProc() above). */ #asm public _debugproc public _debugmain cseg _debugproc: nop nop nop nop nop movem.l D2-D7/A2-A6,-(sp) jsr _debugmain movem.l (sp)+,D2-D7/A2-A6 rts #endasm !Funky!Stuff! fi # end of overwriting check echo shar: "extracting 'device.uue'" '(14139 characters)' if test -f 'device.uue' then echo shar: "will not over-write existing file 'device.uue'" else cat << \!Funky!Stuff! > 'device.uue' begin 644 device M```#\P`````````#``````````(```C>````1P````$```/I```(WDY5_NI( MYP\P0GD```"80KD```"R0KD```"N0KD```"J(_D````$````HD*G2'H.[$ZY M```C"%!/(\````"F0J=.N0``(IA83R/`````FB!Y````FDAH`%Q.N0``(V18 M3R!Y````FDAH`%Q.N0``(N)83RM`__P@;?_\)&@`"DJY````IF<P("H`'.6` M(\````">('D```">(#D```":T+P```!<(4``""5\_____P`,0JH`$&`40JH` M#"\*3KH/M%A/3-\,\$Y=3G4O"DZZ#Z183TZZ%W(@>0```)X@*``HY8`K0/[R M(&W^\G``$!`[0/[P2'D```"V3KD``"+V6$](>0```,).N0``(O983TAX`#A( M>0```.).N0``&OY03S/\``$```#V2'D```$"3KD``"+V6$](>``!,"W^\$C` M4H`O`$ZY```B<E!/(\````#N,"W^\$C`+P`O.0```.X@;?[R4H@O"$ZY```A M6D_O``PP+?[P('D```#N0C```"\Y````[C`M_O!(P"\`2'H-EDZZ%ZA/[P`, M&WP``?_[('D```":2&@`7$ZY```C9%A/3KH5G"!Y````FDAH`%Q.N0``(N)8 M3RM`__QG``RT(&W__"1H``HE?/____\`#$*J`!!X`"\J`"`O*@`<+RH`&"\J M`!0O*@`(2'H-/TZZ%SQ/[P`8("H`"&``"ZY"+?_[8``,3B\J`!A.NA(<6$\K M0/[R2&W^^R\J`!Q.N@[X4$](>@TM2&W^^TZY```;5E!/2H!F"#/\``$```"8 M2'H-&DAM_OM.N0``&U903TJ`9@9">0```)A(;?[N2&W^^TAM_O).NA'F3^\` M#"H`9W`O+?[N+RW^\DAZ#.A.NA:N3^\`#"!%#&@``0`49@@X/`#48```_"!% M2F@`%FP(.#P`RF```.P,J@```^T`"&8(($52:``68"8@14IH`!9O!C@\`,I@ M&`RJ```#[@`(9@@O!4ZZ#ZY83R!%4V@`%F!82'H,HTZZ%D983TJM_O)F"#@\ M`-)@``":#*H```/N``AF,B\M_NY(>/__+RW^\DZZ#O)/[P`,*@`@15-H`!8@ M12\H``PO!4AZ#&E.NA8`3^\`#&`$.#P`S4I$9E1(>0`!``%(>``83KD``")R M4$\L`"`J`!3E@"!`(48`)"\&2'H,24ZZ%<A03R!&(44`""!%2&@`($ZZ#BI8 M3R!&(4``#"\&2'D```"V3KD``"*(4$](>0```+9.N@X(6$]*@&842'D```#" M3KH-^%A/2H!F!$(M__M@``J<*BH`%"!%+"@`#"XJ`!@K:@`<_O(O!B\%($4B M12`H`!#0J0`4+P!(>@O?3KH52$_O`!!*K?[R9P``KDJ&9P``J"!&(D4@*``, MD*D`%"M`_NXO+?[R+RW^[DAZ"]!.NA463^\`#"`M_O*PK?[N;"XO+?[R+P<@ M12)&+&@`%-WI``@O#DZY```A6D_O``P@12`M_O+1J``40JW^\F!&+RW^[B\' M($4B1BQH`!3=Z0`(+PY.N0``(5I/[P`,("W^[I&M_O+>K?[N($4B1B`I``S1 MJ``0($5"J``4+P9.N@SL6$\L`&``_TX@12%&``P@*@`<D*W^\B5```Q@``F@ M*BH`%"!%+"@`#"XJ`!@K:@`<_O(O!4AZ"SE.NA1<4$]*K?[R9P`!2DJ&9P`` MJB!&+R@`#"\M_O)(>@LC3KH4.D_O``P@1B)%("@`#)"I`!0K0/[N("W^\K"M M_NYL+B\M_O(@12)&+&@`%-WI``@O#B\'3KD``"%:3^\`#"!%("W^\M&H`!1" MK?[R8$8O+?[N($4B1BQH`!3=Z0`(+PXO!TZY```A6D_O``S>K?[N("W^[I&M M_O(@12)&("D`#-&H`!`@14*H`!0O!DZZ#`!83RP`8```F"\M_O)(>@J53KH3 MF%!/2'@``4AX`!!.N0``(G)03RP`2'@``2\M_O).N0``(G)03R!&(4``""!& M(6W^\@`,($4B:``(("W^\M&I`!P@12`M_O+1J``0($5"J``4("W^\M&Y```` MJB\&($4B:``(2&D`($ZY```A-E!/+RW^\B!&+R@`""\'3KD``"%:3^\`#$*M M_O)\`&``_K(@*@`<D*W^\B5```P@12%&``Q@``@:*BH`%"!%+"@`""\%3KD` M`"-(6$](>``8+P5.N0``(KQ03R!&4V@`%DIH`!9L!B!&0F@`%DAY````MDZZ M"RI83TJ`9A1(>0```,).N@L:6$]*@&8$0BW_^V``![XJ*@`4($4B12`H`!#0 MJ0`4)4``#"XJ`!A*J@`<9@X@12)%("@`$-"I`!3>@`RJ`````0`<9@H@12)H M``C>J0`<2H=M#"!%(F@`"+ZI`!QC"#@\`-M@``=F($5"J``4(D5"J0`0($4B M:``(2&D`($ZZ"II83RP`8#8@12)&("@`$-"I``RPAV,0($4B12`'D*D`$"%` M`!1@&B!%(D8@*0`,T:@`$"\&3KH*0EA/+`!*AF;&($4A1@`,8``'`B`J`!CE M@"H`+RH`%$ZZ#,A83RP`($8,:/__`!1F"#@\`-1@``;<($5*D&8(.#P`Z&`` M!LX@12P0+P9.N@GR6$\@12"`*T;^]GC_("H`&.6`*@!*1&<&+"W^]F`<+RH` M%$ZZ#'183RP`($9(:``@3KH)WEA/($4@@'@`($8P*``42,`B12-```0@1B\H M``PB14AI``E.N0``&X903R!&+R@`#$ZY```@G%A/($410``(($8B12-H`!@` M="!%0J@`>"!&(D4C:``<`'P@12)&("D`''()XJ@A0`"`($71_````(0B1M/\ M````+"#9(-D@V2!&2J@`$&<J($8O*``0(D5(:0"13KD``!N&4$\@1B\H`!!. 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