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DR-DOS-OpenDOS/IBMDOS/BIN/FCBS.LST
Sepp J Morris 34b50d2a29 Upload
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PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 1
= 0001 __RASM__ EQU 1
title 'FCB - DOS file system FCB support'
; File : $FCBS.A86$
;
; Description :
;
; Original Author : DIGITAL RESEARCH
;
; Last Edited By : $CALDERA$
;
;-----------------------------------------------------------------------;
; Copyright Work of Caldera, Inc. All Rights Reserved.
;
; THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
; PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
; ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
; WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
; THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
; HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
; AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
; AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
; COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
; CONDENSED, EXPANDED, COLLECTED, COMPILED, LINKED, RECAST,
; TRANSFORMED OR ADAPTED WITHOUT THE PRIOR WRITTEN CONSENT OF
; CALDERA, INC. ANY USE OR EXPLOITATION OF THIS WORK WITHOUT
; AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND
; CIVIL LIABILITY.
;-----------------------------------------------------------------------;
;
; *** Current Edit History ***
; *** End of Current Edit History ***
; $Log$
; FCBS.A86 1.10 93/11/11 15:38:14
; Chart Master fix - fcb_readblk over > 64k is truncated to 64k and
; error 2 (Segment boundry overlap) is returned
; FCBS.A86 1.9 93/10/18 17:37:06
; fix for >255 open files (PNW Server)
; ENDLOG
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 2
= eject ! include i:fdos.equ
= ; File : $FDOS.EQU$
= ;
= ; Description :
= ;
= ; Original Author : DIGITAL RESEARCH
= ;
= ; Last Edited By : $CALDERA$
= ;
= ;-----------------------------------------------------------------------;
= ; Copyright Work of Caldera, Inc. All Rights Reserved.
= ;
= ; THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
= ; PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
= ; ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
= ; WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
= ; THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
= ; HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
= ; AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
= ; AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
= ; COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
= ; CONDENSED, EXPANDED, COLLECTED, COMPILED, LINKED, RECAST,
= ; TRANSFORMED OR ADAPTED WITHOUT THE PRIOR WRITTEN CONSENT OF
= ; CALDERA, INC. ANY USE OR EXPLOITATION OF THIS WORK WITHOUT
= ; AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND
= ; CIVIL LIABILITY.
= ;-----------------------------------------------------------------------;
= ;
= ; *** Current Edit History ***
= ; *** End of Current Edit History ***
= ;
= ; $Log$
= ;
= ; ENDLOG
= ;
= ; Structure of Buffer Control Blocks
= ; ----------------------------------
= ; These BCBs immediately preceed the data buffers. BCBs are
= ; always shared for all drives and therefore must be big
= ; enough for the largest drive.
= ;
=
= 0000 BCB_NEXT equ word ptr 00h ; link to next buffer
= 0002 BCB_PREV equ word ptr 02h ; link to previous buffer
= 0004 BCB_DRV equ byte ptr 04h ; drive of this buffer or 0FFh
= 0005 BCB_FLAGS equ byte ptr 05h ; buffer flags
= 0006 BCB_REC equ word ptr 06h ; low 16 bits of sector address
= 0008 BCB_REC2 equ byte ptr 08h ; top 8 bits of record address
= 000A BCB_COPIES equ byte ptr 0Ah ; number of copies to write
= 000B BCB_SEPARATION equ word ptr 0Bh ; # sectors copies are apart
= 000D BCB_DDSC equ dword ptr 0Dh ; DWORD ptr to DDSC_
= 0011 BCB_REMOTE equ word ptr 11h ; remote in-use count
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 3
= 0014 BCB_DATA equ byte ptr 14h ; buffer data
=
= 0002 BF_ISFAT equ 0002h ; buffer marked as FAT sector
= 0004 BF_ISDIR equ 0004h ; buffer marked as Directory sector
= 0008 BF_ISDAT equ 0008h ; buffer marked as Data sector
= 0040 BF_DIRTY equ 0040h ; buffer marked as modified
= 0080 BF_REMOTE equ 0080h ; buffer is remote
=
= 0FF6 MAX12 equ 0FF6h ; max. disk size w/ 12-bit media
=
= ; Structure of Hash Control Block
= ; -------------------------------
= ; Each hash control block refers to the hash codes of one
= ; disrectory cluster or a root directory.
=
= 0000 HCB_LINK equ word ptr 0 ; link to next control block
= 0002 HCB_DRV equ byte ptr 2 ; drive for this entry or 0FFh
= 0004 HCB_CLU equ word ptr 4 ; cluster number or 0000 if root
= 0006 HCB_CNT equ word ptr 6 ; number of hashed entries
= 0008 HCB_DATA equ word ptr 8 ; hash buffer data
=
=
= ; Structure of DOS FCB
= ; --------------------
= ; This is hopefully consistent with what DOS stores in an
= ; open file control block for DOS 1.x functions
=
= 0000 MSF_EXTFLG equ byte ptr 0 ; if this is 0xFF, skip 1st 7 byte
= 0006 MSF_ATTRIB equ byte ptr 6 ; file attributes if MSF_EXTFLG
= 0000 MSF_DRIVE equ byte ptr 0 ; 1st byte normally drive code
= 0001 MSF_NAME equ byte ptr 1 ; 8-bit ASCII file name, 11 characters
= 000C MSF_BLOCK equ word ptr 12 ; current block number
= 000E MSF_RECSIZE equ word ptr 14 ; current logical record size
= 0010 MSF_SIZE equ word ptr 16 ; 32-bit file size
= 0014 MSF_DATE equ word ptr 20 ; last date stamp
= 0016 MSF_TIME equ word ptr 22 ; last time stamp
= 0018 MSF_IFN equ byte ptr 24 ;; internal file number
= 0019 MSF_IOCTL equ byte ptr 25 ;; file status
= 001A MSF_BLOCK1 equ word ptr 26 ;; 1st block of file
= 001C MSF_DBLK equ word ptr 28 ;; directory block
= 001C MSF_DEVPTR equ dword ptr 28 ;; address of device driver
= 001E MSF_DCNT equ word ptr 30 ;; directory count
= 0020 MSF_CR equ byte ptr 32 ; current sequential record
= 0021 MSF_RR equ word ptr 33 ; random record address (3 or 4 byte)
= 0023 MSF_RR2 equ byte ptr 35 ; random record overflow
=
=
= ; Structure of DOS DPB
= ; --------------------
= ; The layout of this structure is a guess based on
= ; examples. It is returned by PC MODE on functions 1Fh and
= ; 32h and is required by various disk-related utilities
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 4
= ; like disk editors and CHKDSK.
=
= 0000 DDSC_UNIT equ byte ptr 0 ; absolute drive number
= 0001 DDSC_RUNIT equ byte ptr 1 ; relative unit number
= 0002 DDSC_SECSIZE equ word ptr 2 ; sector size in bytes
= 0004 DDSC_CLMSK equ byte ptr 4 ; sectors/cluster - 1
= 0005 DDSC_CLSHF equ byte ptr 5 ; log2 (sectors/cluster)
= 0006 DDSC_FATADDR equ word ptr 6 ; sector address of FAT
= 0008 DDSC_NFATS equ byte ptr 8 ; # of FAT copies
= 0009 DDSC_DIRENT equ word ptr 9 ; size of root directory
= 000B DDSC_DATADDR equ word ptr 11 ; sector address of cluster #2
= 000D DDSC_NCLSTRS equ word ptr 13 ; # of clusters on disk
= 000F DDSC_NFATRECS equ word ptr 15 ; # of sectors per FAT
= 0011 DDSC_DIRADDR equ word ptr 17 ; sector address of root dir
= 0013 DDSC_DEVHEAD equ dword ptr 19 ; device driver header
= 0013 DDSC_DEVOFF equ word ptr 19
= 0015 DDSC_DEVSEG equ word ptr 21
= 0017 DDSC_MEDIA equ byte ptr 23 ; current media byte
= 0018 DDSC_FIRST equ byte ptr 24 ; "drive never accessed" flag
= 0019 DDSC_LINK equ dword ptr 25 ; next drive's DDSC
= 001D DDSC_BLOCK equ word ptr 29 ; next block to allocate
= 001F DDSC_FREE equ word ptr 31 ; total free clusters on drive
= 0021 DDSC_LEN equ 33
=
=
=
= ; DELWATCH hooks called by OS
=
= 0000 DELW_RDMASK equ 0 ; delete dir search mask
= 0002 DELW_DELETE equ 2 ; delete this dir entry
= 0003 DELW_FREECLU equ 3 ; free some clusters
= 0004 DELW_FREERD equ 4 ; free root dir entry
= 0005 DELW_SPACE equ 5 ; add "deletes" to free space
= 0007 DELW_NEWDISK equ 7 ; new disk logged in
= 000E DELW_PURGE equ 14 ; perge pd file
= 000F DELW_UNDEL equ 15 ; undelete pd file
=
= ; SuperStore hook called by OS
=
= 0010 SSTOR_SPACE equ 10h ; enquire # physical free space
=
= ; Password hooks called by OS
=
= 0020 PASSWD_CREAT equ 20h ; initialise an entry
= 0021 PASSWD_CHMOD equ 21h ; change an entry
= 0022 PASSWD_CHECK equ 22h ; check an entry
=
= ; Share hooks in PCMODE data segment
= ;
= ; These point to a stub which does a "STC, RETF"
= ;
=
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 5
= 000F NUM_SHARE_STUB_ENTRIES equ 15
=
= 0000 S_LOCKS equ DWORD*0 ; share lock/unlock region
= 0004 S_UPDATE equ DWORD*1 ; update DHNDL from share
= 0008 S_RECORD equ DWORD*2 ; update share from DHNDL
= 000C S_FDOSRW equ DWORD*3 ; validate proposed operation
= 0010 S_DISCARD equ DWORD*4 ; discard all files on drive
= 0014 S_OPEN equ DWORD*5 ; files is opening, remember it
= 0018 S_CLOSE equ DWORD*6 ; files is closing, forget it
= 001C S_OM_COMPAT equ DWORD*7 ; check open mode compatible
= 0020 S_CLOSE_IF_OPEN equ DWORD*8 ; close if compat open, else deny
= 0024 S_DENY_IF_OPEN equ DWORD*9 ; deny if open shared/by others
= 0028 S_GET_LIST_ENTRY equ DWORD*10 ; get open file list entry
= 002C S_CLOSE_FILES equ DWORD*11 ; close all files for given PSP/UID
=
= ; struct dirfcb
=
= 0000 DNAME equ byte ptr 0 ;file name & type
= 000B DATTS equ byte ptr 11
= 0001 DA_RO equ 01h ; 0x01 - read/only
= 0002 DA_HIDDEN equ 02h ; 0x02 - hidden
= 0004 DA_SYSTEM equ 04h ; 0x04 - system
= 0008 DA_VOLUME equ 08h ; 0x08 - volume label
= 0010 DA_DIR equ 10h ; 0x10 - sub-directory
= 0020 DA_ARCHIVE equ 20h ; 0x20 - archive
= 0080 DA_CLUSTER equ 80h ; 0x80 - return starting cluster from search (API ex
tenti
= 0080 DA_DELWATCH equ 80h ; 0x88 - return pending delete files
= 00D8 DA_FIXED equ 11011000b ; can't CHMOD label, dir, unused bits
= FF27 DA_CHANGE equ not DA_FIXED ; all others are changeable
=
= ;DATTS2 equ 12 ;CP/M attributes
= ; ; 0x80 - f1' modify default open rules
= ; ; 0x40 - f2' partial close default
= ; ; 0x20 - f3' ignore close checksum errors
= ; ; 0x10 - f4' disable checksums
= ; ; 0x08 - (reserved)
= ; ; 0x04 - DELETE password
= ; ; 0x02 - WRITE password
= ; ; 0x01 - READ password
= 000D DUNDEL equ 13 ;1st letter of deleted file
= 000E DPWD equ word ptr 14 ;16-bit password hash code
= 0010 DMODTIME equ word ptr 16 ;delwatch time (hhhhhmmmmmmsssss)
= 0012 DMODDATE equ word ptr 18 ;delwatch date (yyyyyyymmmmddddd)
= ;DRECSIZE equ 16 ;FlexOS record size
= ;DUSER equ 18 ;FlexOS user ID of creator
= ;DGROUP equ 19 ;FlexOS group ID of creator
= 0014 DPWM equ word ptr 20 ;FlexOS access rights
= 0016 DTIME equ 22 ;time (hhhhhmmmmmmsssss)
= 0018 DDATE equ 24 ;date (yyyyyyymmmmddddd)
= 001A DBLOCK1 equ 26 ;first block in file
= 001C DSIZE equ 28 ;current file size
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 6
=
= ; DOS Media Password Definitions
= ; ------------------------------
=
= 000F PWM_OWNER equ 000Fh ; PWD Owner mask
= 00F0 PWM_GROUP equ 00F0h ; PWD Group mask
= 0F00 PWM_WORLD equ 0F00h ; PWD World mask
= 0888 PWM_R equ 0888h ; PWD required for reading
= 0444 PWM_W equ 0444h ; PWD required for writing
= 0222 PWM_E equ 0222h ; PWD req'd for executing
= 0111 PWM_D equ 0111h ; PWD required for deleting
= 0DDD PWM_ANY equ PWM_R+PWM_W+PWM_D ; PWD required for anything
=
=
= ; literal constants
=
= 0FFF FAT12 equ 00fffh ; 12 bit fat
= FFFF FAT16 equ 0ffffh ; 16 bit fat
=
= FFFF ENDDIR equ 0ffffh ;end of directory
=
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 7
= eject ! include i:msdos.equ
= ; File : $MSDOS.EQU$
= ;
= ; Description :
= ;
= ; Original Author : DIGITAL RESEARCH
= ;
= ; Last Edited By : $CALDERA$
= ;
= ;-----------------------------------------------------------------------;
= ; Copyright Work of Caldera, Inc. All Rights Reserved.
= ;
= ; THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
= ; PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
= ; ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
= ; WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
= ; THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
= ; HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
= ; AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
= ; AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
= ; COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
= ; CONDENSED, EXPANDED, COLLECTED, COMPILED, LINKED, RECAST,
= ; TRANSFORMED OR ADAPTED WITHOUT THE PRIOR WRITTEN CONSENT OF
= ; CALDERA, INC. ANY USE OR EXPLOITATION OF THIS WORK WITHOUT
= ; AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND
= ; CIVIL LIABILITY.
= ;-----------------------------------------------------------------------;
= ;
= ; *** Current Edit History ***
= ; *** End of Current Edit History ***
= ;
= ; $Log$
= ;
= ; ENDLOG
=
=
= 0000 MS_P_TERMCPM equ 00H
= 0001 MS_C_READ equ 01H
= 0002 MS_C_WRITE equ 02H
= 0003 MS_A_READ equ 03H
= 0004 MS_A_WRITE equ 04H
= 0005 MS_L_WRITE equ 05H
= 0006 MS_C_RAWIO equ 06H
= 0007 MS_C_RAWIN equ 07H
= 0008 MS_C_NOECHO equ 08H
= 0009 MS_C_WRITESTR equ 09H
= 000A MS_C_READSTR equ 0aH
= 000B MS_C_STAT equ 0bH
= 000C MS_C_FLUSH equ 0cH
= 000D MS_DRV_ALLRESET equ 0dH
= 000E MS_DRV_SET equ 0eH
= 000F MS_F_OPEN equ 0fH
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 8
= 0010 MS_F_CLOSE equ 10H
= 0011 MS_F_SFIRST equ 11H
= 0012 MS_F_SNEXT equ 12H
= 0013 MS_F_DELETE equ 13H
= 0014 MS_F_READ equ 14H
= 0015 MS_F_WRITE equ 15H
= 0016 MS_F_MAKE equ 16H
= 0017 MS_F_RENAME equ 17H
= 0019 MS_DRV_GET equ 19H
= 001A MS_F_DMAOFF equ 1aH
= 001B MS_DRV_ALLOC equ 1bH
= 001C MS_DRV_ALLOCSPEC equ 1cH
= 0021 MS_F_READRAND equ 21H
= 0022 MS_F_WRITERAND equ 22H
= 0023 MS_F_SIZE equ 23H
= 0024 MS_F_RANDREC equ 24H
= 0025 MS_S_SETINT equ 25H
= 0026 MS_P_MKPSP equ 26H
= 0027 MS_F_READBLK equ 27H
= 0028 MS_F_WRITEBLK equ 28H
= 0029 MS_F_PARSE equ 29H
= 002A MS_T_GETDATE equ 2aH
= 002B MS_T_SETDATE equ 2bH
= 002C MS_T_GETTIME equ 2cH
= 002D MS_T_SETTIME equ 2dH
= 002E MS_F_VERIFY equ 2eH
= 002F MS_F_DMAGET equ 2fH
= 0030 MS_S_BDOSVER equ 30H
= 0031 MS_P_TERMKEEP equ 31H
= 0033 MS_S_BREAK equ 33H
= 0035 MS_S_GETINT equ 35H
= 0036 MS_DRV_SPACE equ 36H
= 0038 MS_S_COUNTRY equ 38H
= 0039 MS_X_MKDIR equ 39H
= 003A MS_X_RMDIR equ 3aH
= 003B MS_X_CHDIR equ 3bH
= 003C MS_X_CREAT equ 3cH
= 003D MS_X_OPEN equ 3dH
= 003E MS_X_CLOSE equ 3eH
= 003F MS_X_READ equ 3fH
= 0040 MS_X_WRITE equ 40H
= 0041 MS_X_UNLINK equ 41H
= 0042 MS_X_LSEEK equ 42H
= 0043 MS_X_CHMOD equ 43H
= 0044 MS_X_IOCTL equ 44H
= 0045 MS_X_DUP equ 45H
= 0046 MS_X_DUP2 equ 46H
= 0047 MS_X_CURDIR equ 47H
= 0048 MS_M_ALLOC equ 48H
= 0049 MS_M_FREE equ 49H
= 004A MS_M_SETBLOCK equ 4aH
= 004B MS_X_EXEC equ 4bH
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 9
= 004C MS_X_EXIT equ 4cH
= 004D MS_X_WAIT equ 4dH
= 004E MS_X_FIRST equ 4eH
= 004F MS_X_NEXT equ 4fH
= 0050 MS_P_SETPSP equ 50H
= 0054 MS_F_GETVERIFY equ 54H
= 0056 MS_X_RENAME equ 56H
= 0057 MS_X_DATETIME equ 57H
= 0058 MS_M_STRATEGY equ 58h
= 0059 MS_F_ERROR equ 59H
= 005A MS_X_MKTEMP equ 5aH
= 005B MS_X_MKNEW equ 5bH
= 005C MS_F_LOCK equ 5cH
= 0060 MS_X_EXPAND equ 60H
= 0062 MS_P_GETPSP equ 62H
= 6601 MS_X_GETCP equ 6601h
= 6602 MS_X_SETCP equ 6602h
= 0067 MS_X_SETHC equ 67h
= 0068 MS_X_COMMIT equ 68h
=
= 0021 DOS_INT equ 21h ; DOS Entry Point
= ;
= 0000 STDIN equ 0 ; Standard Console Input Handle
= 0001 STDOUT equ 1 ; Standard Console Output Handle
= 0002 STDERR equ 2 ; Standard Error Output
= 0003 STDAUX equ 3 ; Auxilary Device Handle
= 0004 STDPRN equ 4 ; Printer Device Handle
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 10
= eject ! include i:mserror.equ
= ; File : $MSERROR.EQU$
= ;
= ; Description :
= ;
= ; Original Author : DIGITAL RESEARCH
= ;
= ; Last Edited By : $CALDERA$
= ;
= ;-----------------------------------------------------------------------;
= ; Copyright Work of Caldera, Inc. All Rights Reserved.
= ;
= ; THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
= ; PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
= ; ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
= ; WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
= ; THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
= ; HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
= ; AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
= ; AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
= ; COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
= ; CONDENSED, EXPANDED, COLLECTED, COMPILED, LINKED, RECAST,
= ; TRANSFORMED OR ADAPTED WITHOUT THE PRIOR WRITTEN CONSENT OF
= ; CALDERA, INC. ANY USE OR EXPLOITATION OF THIS WORK WITHOUT
= ; AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND
= ; CIVIL LIABILITY.
= ;-----------------------------------------------------------------------;
= ;
= ; *** Current Edit History ***
= ; *** End of Current Edit History ***
= ;
= ; $Log$
= ;
= ; ENDLOG
=
= FFFF ED_FUNCTION equ -01 ; invalid function number
= FFFE ED_FILE equ -02 ; file not found
= FFFD ED_PATH equ -03 ; path not found
= FFFC ED_HANDLE equ -04 ; too many open files
= FFFB ED_ACCESS equ -05 ; file access denied
= FFFA ED_H_MATCH equ -06 ; invalid handle number
= FFF9 ED_DMD equ -07 ; memory descriptor destroyed
= FFF8 ED_MEMORY equ -08 ; insufficient memory
= FFF7 ED_BLOCK equ -09 ; invalid memory block addr
= FFF6 ED_ENVIRON equ -10 ; invalid environment
= FFF5 ED_FORMAT equ -11 ; invalid format
= FFF4 ED_ACC_CODE equ -12 ; invalid access code
= FFF3 ED_DATA equ -13 ; invalid data
= FFF1 ED_DRIVE equ -15 ; invalid drive specified
= FFF0 ED_DIR equ -16 ; can't remove current dir
= FFEF ED_DEVICE equ -17 ; not same device
= FFEE ED_ROOM equ -18 ; no more files
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 11
=
= FFED ED_PROTECT equ -19 ; disk write protected
= FFEC ED_BADUNIT equ -20 ; invalid drive specified
= FFEB ED_NOTREADY equ -21 ; drive doesn't respond
= FFEA ED_BADCMD equ -22 ; invalid command to driver
= FFE9 ED_BADDATA equ -23 ; data CRC error
= FFE8 ED_BADRHLEN equ -24 ; (shouldn't happen)
= FFE7 ED_BADSEEK equ -25 ; can't seek to track
= FFE6 ED_BADMEDIA equ -26 ; unrecognizable medium
= FFE5 ED_RNF equ -27 ; record/sector not found
= FFE4 ED_NOPAPER equ -28 ; printer error
= FFE3 ED_WRFAIL equ -29 ; write failed
= FFE2 ED_RDFAIL equ -30 ; read failed
= FFE1 ED_GENFAIL equ -31 ; anything failed
= FFE0 ED_SHAREFAIL equ -32 ; sharing conflict
= FFDF ED_LOCKFAIL equ -33 ; locking conflict
= FFDE ED_DISKCHG equ -34 ; invalid disk change
= FFDD ED_NOFCBS equ -35 ; FCB table exhausted
= FFDC ED_NOLOCKS equ -36 ; lock list items exhausted
= FFCE ED_NET equ -50 ; Network Request Not Supported
=
= FFBF ED_NETACCESS equ -65 ; file access denied
=
= FFB7 ED_NETPWD equ -73 ; Server Password Error
= FFB6 ED_NETVER equ -74 ; Incorrect Server version
= FFB5 ED_NETREQ equ -75 ; No Local Network Resources
= FFB4 ED_NETTIME equ -76 ; Network Time Out Error
= FFB3 ED_NETCOMM equ -77 ; Network Communications Error
= FFB2 ED_NETSRVR equ -78 ; No Server Network Resources
= FFB1 ED_NETLOG equ -79 ; Server Not Logged In
=
= FFB0 ED_EXISTS equ -80 ; file already exists
= FFAE ED_MAKE equ -82 ; Cannot Make (Files ??)
= FFAD ED_FAIL equ -83 ; FAIL code returned from INT 24
= FFAC ED_STRUCT equ -84 ; Out of Structures
= FFAB ED_ASSIGN equ -85 ; Already Assigned
= FFAA ED_PASSWORD equ -86 ; Invalid Password
= FFA9 ED_PARAM equ -87 ; Invalid Parameter
= FFA8 ED_NETWRITE equ -88 ; Network write fault
= FFA7 ED_NETFUNC equ -89 ; Function not supported on network
= FFA6 ED_COMPONENT equ -90 ; system component not installed
= FFA6 ED_LASTERROR equ -90 ; Last Error Number Used
=
=
= 0001 CLASS_RESOURCE equ 1 ; Out of Resource
= 0002 CLASS_TEMP equ 2 ; Temporary Situation
= 0003 CLASS_AUTHOR equ 3 ; Authorization Error
= 0004 CLASS_INTERNAL equ 4 ; Internal System Software Error
= 0005 CLASS_HARDWARE equ 5 ; Hardware Failure
= 0006 CLASS_SYSTEM equ 6 ; Serious System Failure
= 0007 CLASS_APPLIC equ 7 ; Application Program Error
= 0008 CLASS_LOST equ 8 ; File/Item Not Found
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 12
= 0009 CLASS_FORMAT equ 9 ; File/Item Illegal Format
= 000A CLASS_LOCKED equ 10 ; File/Item Locked
= 000B CLASS_MEDIA equ 11 ; Media Failure
= 000C CLASS_EXISTS equ 12 ; Item Already Exists
= 000D CLASS_UNKNOWN equ 13 ; Unknown Classification
=
= 0001 ACT_RETRY equ 1 ; Retry a few times then prompt user
= 0002 ACT_DELAY equ 2 ; Delay then as ACT_RETRY
= 0003 ACT_USER equ 3 ; Prompt user to re-enter data
= 0004 ACT_ABORT equ 4 ; Clean Up then ABORT the process
= 0005 ACT_TERM equ 5 ; Terminate immeadiately NO CLEAN UP
= 0006 ACT_IGNORE equ 6 ; Ignore the Error
= 0007 ACT_URETRY equ 7 ; Retry the error after user intervention
=
= 0001 LOC_UNKNOWN equ 1 ; Unknown error location
= 0002 LOC_BLOCK equ 2 ; Block Device Failure
= 0003 LOC_NET equ 3 ; Network Failure
= 0004 LOC_CHAR equ 4 ; Related to Serial/Character devices
= 0005 LOC_MEMORY equ 5 ; Failure related to Memory
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 13
= eject ! include i:doshndl.def ; DOS Handle Structures
= ; File : $DOSHNDL.DEF$
= ;
= ; Description :
= ;
= ; Original Author : DIGITAL RESEARCH
= ;
= ; Last Edited By : $CALDERA$
= ;
= ;-----------------------------------------------------------------------;
= ; Copyright Work of Caldera, Inc. All Rights Reserved.
= ;
= ; THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
= ; PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
= ; ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
= ; WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
= ; THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
= ; HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
= ; AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
= ; AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
= ; COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
= ; CONDENSED, EXPANDED, COLLECTED, COMPILED, LINKED, RECAST,
= ; TRANSFORMED OR ADAPTED WITHOUT THE PRIOR WRITTEN CONSENT OF
= ; CALDERA, INC. ANY USE OR EXPLOITATION OF THIS WORK WITHOUT
= ; AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND
= ; CIVIL LIABILITY.
= ;-----------------------------------------------------------------------;
= ;
= ; *** Current Edit History ***
= ; *** End of Current Edit History ***
= ;
= ; $Log$
= ;
= ; ENDLOG
=
= 0000 DCNTRL_DSADD equ dword ptr 0000h
= 0000 DCNTRL_DSOFF equ word ptr 0000h
= 0002 DCNTRL_DSSEG equ word ptr 0002h
= 0004 DCNTRL_COUNT equ word ptr 0004h
= 0006 DCNTRL_LEN equ 6
=
= 0000 DHNDL_COUNT equ word ptr 00h ; 00 - Usage Count
= 0002 DHNDL_MODE equ word ptr 02h ; 02 - File Mode
=
= 8000 DHM_FCB equ 8000h ; marks as FCB
= 4000 DHM_COMMIT equ 4000h ; auto-commit file
= 2000 DHM_NOCRIT equ 2000h ; no critical errors
= 0080 DHM_LOCAL equ 10000000b ; file is not inherited
= 0070 DHM_SHAREMSK equ 01110000b ; sharing bits
= 0000 DHM_COMPAT equ 00000000b
= 0010 DHM_DENY_ALL equ 00010000b ; exclusive - deny all
= 0020 DHM_DENY_WRITE equ 00100000b
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 14
= 0030 DHM_DENY_READ equ 00110000b
= 0040 DHM_DENY_NONE equ 01000000b
= 000F DHM_RWMSK equ 00001111b ; read write bits
= 0002 DHM_RW equ 00000010b ; file opened read/write
= 0001 DHM_WO equ 00000001b ; file opened write only
= 0000 DHM_RO equ 00000000b ; file opened read only
=
= ;
= ; 01h to 03h To be Determined
= ;
= 0004 DHNDL_DATRB equ byte ptr 04h ; Disk attribute byte
= 0005 DHNDL_ATTR equ byte ptr 05h ; Attribute Byte
= 0005 DHNDL_WATTR equ word ptr 05h ; Attribute Word
=
= 8000 DHAT_REMOTE equ 8000h ; set if file remote
= 4000 DHAT_TIMEOK equ 4000h ; set if timestamp up to date
= 1000 DHAT_LOCAL equ 1000h ; file is not inherited
= 0800 DHAT_NETPRN equ 0800h ; device is networked printer
= 0080 DHAT_DEV equ 0080h ; device/file bit
= 0040 DHAT_READY equ 0040h ; ready/not ready bit
= 0040 DHAT_CLEAN equ 0040h ; this bit CLEAR if dirty
= 0020 DHAT_BIN equ 0020h ; raw/cooked bit
= 001F DHAT_DRVMSK equ 001Fh ; drive in bottom bits
= 0008 DHAT_CLK equ 0008h ; -reserved-
= 0004 DHAT_NUL equ 0004h ; handle is null device
= 0002 DHAT_COT equ 0002h ; handle is console output device
= 0001 DHAT_CIN equ 0001h ; handle is console input device
=
= 0007 DHNDL_DEVPTR equ dword ptr 07h ; 07 - pointer to device
= 0007 DHNDL_DEVOFF equ word ptr 07h ; 07 - offset of device
= 0009 DHNDL_DEVSEG equ word ptr 09h ; 09 - segment of device
= 000B DHNDL_BLK1 equ word ptr 0Bh ; 0B - first cluster in file
= 000D DHNDL_TIME equ word ptr 0Dh ; 0D - file time stamp
= 000F DHNDL_DATE equ word ptr 0Fh ; 0F - file date stamp
= 0011 DHNDL_SIZE equ dword ptr 11h ; 11 - file length
= 0011 DHNDL_SIZELO equ word ptr 11h
= 0013 DHNDL_SIZEHI equ word ptr 13h
= 0015 DHNDL_POS equ dword ptr 15h ; 15 - current file position
= 0015 DHNDL_POSLO equ word ptr 15h
= 0017 DHNDL_POSHI equ word ptr 17h
= 0019 DHNDL_IDX equ word ptr 19h ; 19 - relative cluster within file of last
read
= 001B DHNDL_DBLK equ word ptr 1Bh ; 1B - cluster # of dir entry
= 001E DHNDL_DCNTHI equ byte ptr 1Eh ; 1E - dir offset # within cluster
= 001F DHNDL_DCNTLO equ byte ptr 1Fh ; 1F - dir offset # within cluster
= 0020 DHNDL_NAME equ byte ptr 20h ; 20 - File/Device Name
= 0028 DHNDL_EXT equ byte ptr 28h ; 28 - File extension
= 002B DHNDL_SFT equ dword ptr 2Bh ; 2B - pointer to previous SFT
= 002F DHNDL_UID equ word ptr 2Fh ; 2F - Owning Machine ID
= 0031 DHNDL_PSP equ word ptr 31h ; 31 - Owning PSP
= 0033 DHNDL_SHARE equ word ptr 33h ; 33 - Offset of sharing record
= 0035 DHNDL_BLK equ word ptr 35h ; 35 - absolute cluster of last read
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 15
= ; 37 - dword reserved for IFS
= 003B DHNDL_LEN equ 3Bh
=
= ; With DOS 3 structures _DBLK is a 16 bit
=
=
= ; Logical Drive Table format
= 0000 LDT_NAME equ byte ptr 00h ; 00 - Ascii Name field
= 0043 LDT_FLAGS equ word ptr 43h ; 43 - Flag field
= 0045 LDT_PDT equ dword ptr 45h ; 45 - PDT for this drive
= 0049 LDT_BLK equ word ptr 49h ; 49 - directory sector
= 004B LDT_ROOT equ word ptr 4bh ; 4B - virtual block root
= 004D LDT_DRV equ byte ptr 4dh ; 4D - physical drive
= 004F LDT_ROOTLEN equ word ptr 4fh ; 4F - Length of root portion
= 0058 LDT_LEN equ 58h
=
= 8000 LFLG_NETWRKD equ 8000h
= 4000 LFLG_PHYSICAL equ 4000h
= 2000 LFLG_JOINED equ 2000h
= 1000 LFLG_SUBST equ 1000h
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 16
eject
BDOS_DATA dseg word
BDOS_CODE cseg
extrn ifn2dhndl:near
extrn parse_one:near
extrn fdos_entry:near
Public fdos_exit
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 17
eject
; TERMINATE CHILD (EXIT)
; +----+----+
; | 24 |
; +----+----+
; entry:
; ------
; -none-
; exit:
; -----
; -none-
; Close down all FCB handles associated with the current PSP
;
fdos_exit:
;---------
0000 1E push ds
0001 161F push ss ! pop ds ; DS -> PCM_DSEG
0003 2BC0 sub ax,ax ; start with first DHNDL_
fdos_exit10:
0005 E80000 E call ifn2dhndl ; get DHNDL_
0008 7238 0042 jc fdos_exit40 ; stop if we have run out
000A A30200 E mov fcb_pb+2,ax ; we may close this IFN
000D 50 push ax
000E 268B0F mov cx,es:DHNDL_COUNT[bx] ; get the open count
0011 E32A 003D jcxz fdos_exit30 ; skip if nothing to do
0013 A10000 E mov ax,current_psp ; get current PSP
0016 263B4731 cmp ax,es:DHNDL_PSP[bx] ; does it belong to this PSP
001A 7521 003D jne fdos_exit30
001C 36A10000 E mov ax,ss:machine_id ; get current process
0020 263B472F cmp ax,es:DHNDL_UID[bx]
0024 7517 003D jne fdos_exit30
0026 26F747020080 test es:DHNDL_MODE[bx],DHM_FCB
002C 740A 0038 jz fdos_exit20 ; skip close if not FCB
002E 06 push es
002F 53 push bx ; save the DHNDL
0030 B83E00 mov ax,MS_X_CLOSE
0033 E8DB04 0511 call fcb_fdos ; make the FDOS do the work
0036 5B pop bx
0037 07 pop es ; recover the DHNDL
fdos_exit20:
0038 26C7070000 mov es:DHNDL_COUNT[bx],0 ; always free the handle if it's ours
fdos_exit30:
003D 58 pop ax
003E FEC0 inc al ; onto next IFN
0040 75C3 0005 jnz fdos_exit10
fdos_exit40:
0042 1F pop ds
0043 C3 ret
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 18
Public fdos_fcb
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 19
eject
; GENERIC FCB FUNCTION (FCB)
; +----+----+----+----+----+----+----+----+
; | 22 | fcbadr | count |
; +----+----+----+----+----+----+----+----+
; | func |
; +----+----+
; entry:
; ------
; fcbadr: FCB address
; count: multi-sector count for read/write
; func: FCB sub-function
; exit:
; -----
; AX: return code or error code ( < 0)
fdos_fcb:
;--------
0044 8B5E02 mov bx,2[bp] ; BX -> parameter block
0047 8B5F08 mov bx,8[bx] ; get subfunction code
004A D1E3 shl bx,1 ; make it word index
004C 80EB1E sub bl,15*WORD ; adjust to base address
004F 721E 006F jc fcb_error ; reject if too low
0051 80FB12 cmp bl,FCB_MAX1 ; is it in 1st block
0054 720F 0065 jb fdos_fcb10
0056 80EB12 sub bl,(33-24)*WORD ; adjust for gap
0059 7214 006F jc fcb_error
005B 80FB1A cmp bl,FCB_MAX2 ; is it in 2nd block
005E 7205 0065 jb fdos_fcb10
0060 80EB04 sub bl,(39-37)*WORD ; adjust for gap
0063 720A 006F jc fcb_error
fdos_fcb10:
0065 83FB1E cmp bx,FCB_MAX3 ; check the range
0068 7305 006F jae fcb_error ; skip if invalid function
006A 2EFFA77300 R jmp fcb_table[bx] ; call the right function
fcb_error:
006F BBFFFF mov bx,ED_FUNCTION
0072 C3 ret
0073 9900 R fcb_table dw fcb_open ; 15-open file
0075 3001 R dw fcb_close ; 16-close file
0077 6001 R dw fcb_first ; 17-find first
0079 6801 R dw fcb_next ; 18-find next
007B 5801 R dw fcb_delete ; 19-delete file
007D 9E01 R dw fcb_read ; 20-read from file
007F 9901 R dw fcb_write ; 21-write to file
0081 9100 R dw fcb_make ; 22-make file
0083 4D01 R dw fcb_rename ; 23-rename file
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 20
0012 FCB_MAX1 equ (offset $ - offset fcb_table)
0085 3102 R dw fcb_readrand ; 33-read from file
0087 2C02 R dw fcb_writerand ; 34-write to file
0089 9602 R dw fcb_size ; 35-compute file size
008B 7901 R dw fcb_setrecord ; 36-set relative record
001A FCB_MAX2 equ (offset $ - offset fcb_table)
008D 5102 R dw fcb_readblk ; 39-read from file
008F 4C02 R dw fcb_writeblk ; 40-write to file
001E FCB_MAX3 equ (offset $ - offset fcb_table)
fcb_make:
;--------
0091 E8C302 0357 call fcb_path_prep ; build pathname
0094 B83C00 mov ax,MS_X_CREAT
0097 EB06 009F jmps fcb_open_make_common
fcb_open:
;--------
0099 E8BB02 0357 call fcb_path_prep ; build pathname
009C B83D00 mov ax,MS_X_OPEN
fcb_open_make_common:
009F C70606000280 E mov fcb_pb+6,DHM_RW+DHM_FCB ; open as an FCB for read/write
00A5 E86904 0511 call fcb_fdos ; lets try and open the file
00A8 7301 00AB jnc fcb_open10 ; skip if we can't
00AA C3 ret
fcb_open10:
00AB E80000 E call ifn2dhndl ; ES:BX -> DHNDL_ we have opened
00AE 1E push ds
00AF 0653 push es ! push bx ; save DHNDL_
00B1 E8E802 039C call fcb_point ; ES:BX = FCB
00B4 5E1F pop si ! pop ds ; DS:SI -> DHNDL_
00B6 26884718 mov es:MSF_IFN[bx],al ; store IFN away
00BA 26C7470C0000 mov es:MSF_BLOCK[bx],0 ; current block number
00C0 26C7470E8000 mov es:MSF_RECSIZE[bx],128 ; current logical record size
00C6 E83900 0102 call fcb_update ; update misc changing fields
00C9 8B4407 mov ax,ds:DHNDL_DEVOFF[si]
00CC 2689471C mov es:word ptr MSF_DEVPTR[bx],ax
00D0 8B4409 mov ax,ds:DHNDL_DEVSEG[si]
00D3 2689471E mov es:word ptr MSF_DEVPTR+2[bx],ax
00D7 8B440B mov ax,ds:DHNDL_BLK1[si]
00DA 2689471A mov es:MSF_BLOCK1[bx],ax
00DE 8A4405 mov al,ds:DHNDL_ATTR[si]
00E1 26884719 mov es:MSF_IOCTL[bx],al
00E5 268A07 mov al,es:MSF_DRIVE[bx] ; get drive from FCB
00E8 FEC8 dec al ; was absolute drive specified ?
00EA 7904 00F0 jns fcb_open20 ; if so use it
00EC 36A00000 E mov al,ss:current_dsk ; else use default drive
fcb_open20:
00F0 FEC0 inc al ; make drive 1 rather than 0 based
00F2 268807 mov es:MSF_DRIVE[bx],al ; drive code
if 0
test ds:DHNDL_DATRB[si],DA_VOLUME
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 21
else
00F5 36F706080008 E test ss:fcb_pb+8,DA_VOLUME
00 E
endif
00FC 1F pop ds
00FD 7531 0130 jnz fcb_close ; don't leave VOL label's open
00FF 33DB xor bx,bx ; no errors !
0101 C3 ret
fcb_update:
;----------
; On Entry:
; DS:SI -> DHNDL_
; ES:BX -> FCB
; On Exit:
; DATE/TIME/SIZE/DBLK/DCNT fields updated
;
0102 8B440D mov ax,ds:DHNDL_TIME[si]
0105 26894716 mov es:MSF_TIME[bx],ax
0109 8B440F mov ax,ds:DHNDL_DATE[si]
010C 26894714 mov es:MSF_DATE[bx],ax
0110 8B4411 mov ax,ds:DHNDL_SIZELO[si]
0113 26894710 mov es:MSF_SIZE[bx],ax
0117 8B4413 mov ax,ds:DHNDL_SIZEHI[si]
011A 26894712 mov es:MSF_SIZE+2[bx],ax
011E 8B441B mov ax,ds:DHNDL_DBLK[si]
0121 2689471C mov es:MSF_DBLK[bx],ax
0125 8A441F mov al,ds:DHNDL_DCNTLO[si]
0128 8A641E mov ah,ds:DHNDL_DCNTHI[si]
012B 2689471E mov es:MSF_DCNT[bx],ax
012F C3 ret
fcb_close:
;---------
; close file (DOS function 10h)
0130 E86902 039C call fcb_point ; ES:BX -> FCB
0133 B0FF mov al,0FFh
0135 263A4718 cmp al,es:MSF_IFN[bx] ; is it a multiple close ?
0139 740F 014A je fcb_fdos_common10 ; don't re-open for this...
013B E8A201 02E0 call fcb_handle_vfy ; verify we have a sensible handle
013E 26884718 mov es:MSF_IFN[bx],al ; mark FCB as closed (it will be)
0142 B83E00 mov ax,MS_X_CLOSE ; now close it
; jmps fcb_fdos_common
fcb_fdos_common:
;---------------
0145 E8C903 0511 call fcb_fdos ; make the FDOS do the work
0148 7202 014C jc fcb_fdos_common20 ; return any error codes
fcb_fdos_common10:
014A 33DB xor bx,bx ; else return zero
fcb_fdos_common20:
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 22
014C C3 ret
fcb_rename:
;----------
014D E80702 0357 call fcb_path_prep
0150 E8EE01 0341 call fcb_path2_prep
0153 B85600 mov ax,MS_X_RENAME ; it's a rename
0156 EBED 0145 jmps fcb_fdos_common
fcb_delete:
;----------
0158 E8FC01 0357 call fcb_path_prep
015B B84100 mov ax,MS_X_UNLINK ; it's a delete
015E EBE5 0145 jmps fcb_fdos_common
fcb_first:
;---------
0160 E8F401 0357 call fcb_path_prep ; prepare pathname
0163 B84E00 mov ax,MS_X_FIRST ; we want to search 1st
0166 EB06 016E jmps fcb_search_common
fcb_next:
;--------
0168 E88C03 04F7 call fcb_restore_search_state
016B B84F00 mov ax,MS_X_NEXT
fcb_search_common:
016E E8F502 0466 call fcb_search ; 0 of OK, otherwise ED_..
0171 7205 0178 jc fcb_search_common10
0173 E81503 048B call fcb_save_search_state ; save sucessful state
0176 33DB xor bx,bx ; return code in BX
fcb_search_common10:
0178 C3 ret
fcb_setrecord:
;-------------
0179 E82002 039C call fcb_point ; ES:BX -> FCB
017C B88000 mov ax,128 ; multiply current block by 128
017F 26F7670C mul es:MSF_BLOCK[bx] ; to give current record number
0183 33C9 xor cx,cx
0185 268A4F20 mov cl,es:MSF_CR[bx] ; Add in the current record
0189 03C1 add ax,cx ; to DX:AX to give the
018B 83D200 adc dx,0 ; relative record
018E 26894721 mov es:MSF_RR[bx],ax ; save the result
0192 26885723 mov es:MSF_RR2[bx],dl
0196 33DB xor bx,bx ; we did OK
0198 C3 ret
fcb_write:
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 23
;---------
0199 B84000 mov ax,MS_X_WRITE ; make it a write
019C EB03 01A1 jmps fcb_seq_rw
fcb_read:
;--------
019E B83F00 mov ax,MS_X_READ ; make it a read
fcb_seq_rw:
01A1 E83C01 02E0 call fcb_handle_vfy ; verify we have a sensible handle
01A4 50 push ax ; save the operation
01A5 E80402 03AC call fcb_get_count ; AX = bytes to read
01A8 50 push ax ; save byte count
01A9 E86402 0410 call fcb_seek_seq ; Seek to position in the file
01AC 59 pop cx ; recover byte to xfer
01AD 58 pop ax ; and the Operation Code
01AE 720A 01BA jc fcb_seq_rw10
01B0 E80800 01BB call fcb_rw ; do the Op
01B3 7205 01BA jc fcb_seq_rw10
01B5 53 push bx ; save the error code
01B6 E80102 03BA call fcb_update_seq ; update FCB filepos
01B9 5B pop bx ; recover error
fcb_seq_rw10:
01BA C3 ret
fcb_rw:
; On Entry:
; AX = operation code
; CX = count
; fcb_pb+2 = IFN
; On Exit:
; BX = error code
01BB 36C4160000 E les dx,ss:dword ptr dma_offset
01C0 03CA add cx,dx ; see if we overflow
01C2 7236 01FA jc fcb_rw20
01C4 2BCA sub cx,dx ; count back to normal
01C6 51 push cx ; save target count
01C7 89160400 E mov fcb_pb+4,dx
01CB 8C060600 E mov fcb_pb+6,es ; setup buffer address
01CF 890E0800 E mov fcb_pb+8,cx ; and target count
01D3 E83B03 0511 call fcb_fdos ; ask the FDOS to do the read/write
01D6 7220 01F8 jc fcb_rw10 ; we got a real error...
01D8 1E push ds
01D9 06 push es
01DA A10200 E mov ax,fcb_pb+2 ; get IFN
01DD E80000 E call ifn2dhndl ; ES:BX -> DHNDL_ we have open
01E0 0653 push es ! push bx ; save DHNDL_
01E2 E8B701 039C call fcb_point ; ES:BX = FCB
01E5 5E1F pop si ! pop ds ; DS:SI -> DHNDL_
01E7 E818FF 0102 call fcb_update ; update file size/time-stamp
01EA 07 pop es
01EB 1F pop ds
01EC 58 pop ax ; recover target count
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 24
01ED 8B0E0800 E mov cx,fcb_pb+8 ; we xfered this much
01F1 3BC8 cmp cx,ax ; did we xfer enough
01F3 7209 01FE jb fcb_rw30 ; nope..
01F5 33DB xor bx,bx ; xfer went OK
01F7 C3 ret
fcb_rw10:
01F8 58 pop ax ; discard target count
01F9 C3 ret
fcb_rw20:
; Our DTA is too small - return 2
01FA BB0200 mov bx,2 ; indicate the DTA is too small
; stc ; error - don't update FCB
01FD C3 ret
fcb_rw30:
; We have some form of EOF - lets look into it
01FE E89B01 039C call fcb_point ; ES:BX = FCB
0201 268B5F0E mov bx,es:MSF_RECSIZE[bx] ; BX = record size
0205 8BC1 mov ax,cx
0207 33D2 xor dx,dx ; DX:AX = bytes xfer'd
0209 F7F3 div bx ; did we xfer a complete
020B 85D2 test dx,dx ; number of records ?
020D 7419 0228 jz fcb_rw40 ; if so return 1
; Partial data was read - fill out with zero's and return 3
020F 40 inc ax ; allow for incomplete record
0210 50 push ax ; save rounded up xfer count
0211 36C43E0000 E les di,ss:dword ptr dma_offset
0216 03F9 add di,cx ; point to 1st byte after xfer
0218 8BCB mov cx,bx ; this many in a record
021A 2BCA sub cx,dx ; so this many weren't xfer'd
021C 33C0 xor ax,ax ; fill them with zero's
021E F3AA rep stosb ; zap the bytes we didn't xfer to
0220 58 pop ax ; recover xfer count
0221 F7E3 mul bx ; and work out # bytes xfered
0223 91 xchg ax,cx ; return bytes in CX
0224 BB0300 mov bx,3 ; indicate EOF (partial read)
; clc ; update FCB
0227 C3 ret
fcb_rw40:
; No Data was xfered - return 1
0228 BB0100 mov bx,1 ; indicate EOF (no data read)
; clc ; update FCB
022B C3 ret
fcb_writerand:
;-------------
022C B84000 mov ax,MS_X_WRITE ; make it a write
022F EB03 0234 jmps fcb_random_rw
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 25
fcb_readrand:
;------------
0231 B83F00 mov ax,MS_X_READ ; make it a read
fcb_random_rw:
0234 E8A900 02E0 call fcb_handle_vfy ; check the handle is OK
0237 50 push ax ; save the code
0238 E87101 03AC call fcb_get_count ; AX = bytes to read
023B 50 push ax ; save byte count
023C 33C9 xor cx,cx ; cause update of seq posn from
023E E8A101 03E2 call fcb_update_rr ; random record position
0241 E8ED01 0431 call fcb_seek_rr ; Seek to position in the file
0244 59 pop cx ; recover byte to xfer
0245 58 pop ax ; and the Operation Code
0246 7203 024B jc fcb_random_rw10
0248 E870FF 01BB call fcb_rw ; do the Op
fcb_random_rw10:
024B C3 ret
fcb_writeblk:
;------------
024C B84000 mov ax,MS_X_WRITE ; make it a write
024F EB03 0254 jmps fcb_block_rw
fcb_readblk:
;-----------
0251 B83F00 mov ax,MS_X_READ ; make it a read
fcb_block_rw:
0254 E88900 02E0 call fcb_handle_vfy ; check the handle is OK
0257 50 push ax ; save the code
0258 E85101 03AC call fcb_get_count ; AX = bytes per record, CX = # records
025B 91 xchg ax,cx ; CX = bytes per record
025C F7E1 mul cx ; AX = bytes to xfer
025E 85D2 test dx,dx ; more than 64K ?
0260 740F 0271 jz fcb_block_rw10 ; then we should truncate it
0262 B80F00 mov ax,15 ; AX = handy mask
0265 99 cwd ; DX = 0
0266 3623060000 E and ax,ss:dma_offset ; get dma offset for para
026B F7D0 not ax ; DX/AX = maximum bytes we can xfer
026D F7F1 div cx ; AX = maximum blocks we can xfer
026F F7E1 mul cx ; AX = bytes to xfer (now < 64K)
fcb_block_rw10:
0271 50 push ax ; save byte count
0272 E8BC01 0431 call fcb_seek_rr ; Seek to position in the file
0275 59 pop cx ; recover byte to xfer
0276 58 pop ax ; and the Operation Code
0277 721C 0295 jc fcb_block_rw20
0279 E83FFF 01BB call fcb_rw ; do the Op
027C 7217 0295 jc fcb_block_rw20
027E 53 push bx ; save the error code
027F E86001 03E2 call fcb_update_rr ; update FCB filepos, get records xferd
0282 8B5E02 mov bx,2[bp] ; BX -> parameter block
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 26
0285 874F06 xchg cx,6[bx] ; update amount xfered
0288 2B4F06 sub cx,6[bx] ; CX = # we didn't xfer (normally 0)
028B 5B pop bx ; recover (possible) error
028C E307 0295 jcxz fcb_block_rw20 ; skip if we read all we wanted to
028E 85DB test bx,bx ; did we have a partial read for
0290 7503 0295 jnz fcb_block_rw20 ; a reason like EOF ?
0292 BB0200 mov bx,2 ; no, we must have truncated it
fcb_block_rw20:
0295 C3 ret
fcb_size:
;--------
0296 E8BE00 0357 call fcb_path_prep
0299 B84300 mov ax,MS_X_CHMOD ; it's a get info
029C C70606000000 E mov fcb_pb+6,0
02A2 E86C02 0511 call fcb_fdos
02A5 7238 02DF jc fcb_size40
02A7 E8F200 039C call fcb_point ; ES:BX = FCB
02AA 268B4F0E mov cx,es:MSF_RECSIZE[bx] ; get the record size
02AE 85C9 test cx,cx ; is it non-zero ?
02B0 7503 02B5 jnz fcb_size10 ; if not
02B2 B98000 mov cx,128 ; make it 128 bytes
fcb_size10:
02B5 A10A00 E mov ax,fcb_pb+10
02B8 8B160C00 E mov dx,fcb_pb+12 ; DX:AX = file length in bytes
02BC E87002 052F call div_32 ; DX:AX = file length in records
02BF E306 02C7 jcxz fcb_size20 ; was there an overflow
02C1 050100 add ax,1
02C4 83D200 adc dx,0 ; include an extra record
fcb_size20:
02C7 E8D200 039C call fcb_point ; ES:BX = FCB
02CA 26894721 mov es:MSF_RR[bx],ax ; low word of size
02CE 26885723 mov es:MSF_RR2[bx],dl ; hi byte of size
02D2 26837F0E40 cmp es:MSF_RECSIZE[bx],64 ; if record size < 64 bytes
02D7 7304 02DD jae fcb_size30 ; then we use a 4 byte
02D9 26887724 mov es:MSF_RR2+1[bx],dh ; random record position
fcb_size30:
02DD 33DB xor bx,bx ; good return
fcb_size40:
02DF C3 ret
; Utility FCB subroutines
;========================
fcb_handle_vfy:
;--------------
; Verify FCB is valid and open, do not return if it isn't
; nb. Called with nothing on stack
;
; On Entry:
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 27
; FCB address in parameter block
; On Exit:
; AX preserved
; ES:BX -> FCB (skipping EXT bit if present)
; fcb_pb+2 = IFN of handle
; On Error - blow away caller and return error in BX
;
; DEBUG - on reopen we could do more checks to ensure we are re-opening the
; same file
02E0 50 push ax
02E1 E8B800 039C call fcb_point
02E4 26837F0E00 cmp es:MSF_RECSIZE[bx],0
02E9 7506 02F1 jne fcb_handle_vfy10
02EB 26C7470E8000 mov es:MSF_RECSIZE[bx],128
fcb_handle_vfy10:
02F1 268A4718 mov al,es:MSF_IFN[bx] ; get IFN
02F5 E80000 E call ifn2dhndl ; ES:BX -> DHNDL_
02F8 720E 0308 jc fcb_handle_vfy20 ; it must be a valid IFN
02FA 26F747020080 test es:DHNDL_MODE[bx],DHM_FCB
0300 7406 0308 jz fcb_handle_vfy20 ; it must be an FCB..
0302 26833F00 cmp es:DHNDL_COUNT[bx],0
0306 7520 0328 jne fcb_handle_vfy30 ; it must also be open..
fcb_handle_vfy20:
0308 E89100 039C call fcb_point
030B 26FF770E push es:MSF_RECSIZE[bx] ; save current record size
030F 26FF770C push es:MSF_BLOCK[bx] ; save current block number
0313 0653 push es ! push bx
0315 E881FD 0099 call fcb_open ; try to re-open the file
0318 5B07 pop bx ! pop es ; point back at FCB
031A 268F470C pop es:MSF_BLOCK[bx] ; restore current block number
031E 268F470E pop es:MSF_RECSIZE[bx] ; restore record size
0322 720F 0333 jc fcb_handle_err
0324 268A4718 mov al,es:MSF_IFN[bx] ; get new IFN
fcb_handle_vfy30:
0328 32E4 xor ah,ah
032A A30200 E mov fcb_pb+2,ax ; set parameter block accordingly
032D E86C00 039C call fcb_point ; ES:BX -> MSF_
0330 58 pop ax
0331 F8 clc
0332 C3 ret
fcb_handle_err:
0333 83C404 add sp,2*WORD ; discard AX and near return address
0336 3DFCFF cmp ax,ED_HANDLE ; if we have run out of handles then
0339 7503 033E jne fcb_handle_err10 ; say no FCB's, else return error
033B B8DDFF mov ax,ED_NOFCBS
fcb_handle_err10:
033E 93 xchg ax,bx ; error code in BX
033F F9 stc
0340 C3 ret
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 28
fcb_path2_prep:
;--------------
; On Entry:
; FCB address in parameter block
; On Exit:
; ES:BX -> FCB (skipping EXT bit if present)
; fcb_pb+6/8 -> unparse name from FCB
;
0341 E85800 039C call fcb_point ; point at the FCB
0344 268A07 mov al,es:MSF_DRIVE[bx] ; get drive
0347 83C310 add bx,16 ; point at 2nd name in FCB
034A BF0000 E mov di,offset fcb_path2
034D 893E0600 E mov fcb_pb+6,di
0351 8C1E0800 E mov fcb_pb+8,ds ; point at buffer we want
0355 EB26 037D jmps fcb_path_prep_common
fcb_path_prep:
;-------------
; On Entry:
; FCB address in parameter block
; On Exit:
; ES:BX -> FCB (skipping EXT bit if present)
; fcb_pb+2/4 -> unparse name from FCB
;
0357 33C0 xor ax,ax ; assume no attribute
0359 8B5E02 mov bx,2[bp] ; BX -> parameter block
035C C45F02 les bx,2[bx] ; ES:BX -> FCB
035F 26803FFF cmp es:MSF_EXTFLG[bx],0ffh ; is it an extended FCB
0363 7507 036C jne fcb_path_prep10
0365 260A4706 or al,es:MSF_ATTRIB[bx] ; we can use file mode from XFCB
0369 83C307 add bx,7 ; skip EXT bit of FCB
fcb_path_prep10:
036C A30800 E mov fcb_pb+8,ax ; remember the attribute
036F 268A07 mov al,es:MSF_DRIVE[bx] ; get drive
0372 BF0000 E mov di,offset fcb_path
0375 893E0200 E mov fcb_pb+2,di
0379 8C1E0400 E mov fcb_pb+4,ds ; point at buffer we want
fcb_path_prep_common:
037D FEC8 dec al ; 0 = default drive
037F 7903 0384 jns fcb_path_prep20
0381 A00000 E mov al,current_dsk ; use default drive
fcb_path_prep20:
0384 1E push ds
0385 1E06 push ds ! push es
0387 1F07 pop ds ! pop es ; ES:DI -> name buffer
0389 0441 add al,'A' ; make drive ASCII
038B AA stosb
038C B03A mov al,':'
038E AA stosb ; now we have 'd:'
038F 8D7701 lea si,MSF_NAME[bx] ; DS:SI -> source name
0392 A5A5 movsw ! movsw
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 29
0394 A5A5 movsw ! movsw ; copy the name leaving spaces intact
0396 B02E mov al,'.'
0398 AA stosb
0399 A5A4 movsw ! movsb ; copy the extention
039B 1F pop ds
; jmps fcb_point ; point ES:BX at FCB again
fcb_point:
;---------
; On Entry:
; FCB address in parameter block
; On Exit:
; ES:BX -> FCB (skipping EXT bit if present)
; (All other regs preserved)
;
039C 8B5E02 mov bx,2[bp] ; BX -> parameter block
039F C45F02 les bx,2[bx] ; ES:BX -> FCB
03A2 26803FFF cmp es:MSF_EXTFLG[bx],0ffh ; is it an extended FCB
03A6 7503 03AB jne fcb_point10
03A8 83C307 add bx,7 ; skip EXT bit of FCB
fcb_point10:
03AB C3 ret
fcb_get_count:
;-------------
; On Entry:
; none
; On Exit:
; AX = bytes per record
; CX = callers CX count
; All regs fair game
;
03AC E8EDFF 039C call fcb_point ; ES:BX -> FCB
03AF 8B7602 mov si,2[bp] ; SI -> parameter block
03B2 8B4C06 mov cx,6[si] ; CX = count
03B5 268B470E mov ax,es:MSF_RECSIZE[bx] ; get record size
03B9 C3 ret
fcb_update_seq:
;--------------
; On Entry:
; CX = byte count actually transferred
; On Exit:
; CX = record count transferred
; All other regs fair game
; CR/BLOCK updated with new value
;
03BA 8BC1 mov ax,cx
03BC 33D2 xor dx,dx ; DX:AX = byte count transfered
03BE E8DBFF 039C call fcb_point ; ES:BX -> FCB
03C1 26F7770E div es:MSF_RECSIZE[bx] ; make records xfered
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 30
03C5 50 push ax ; save records xfered
03C6 91 xchg ax,cx ; also in CX for later
03C7 B88000 mov ax,128
03CA 26F7670C mul es:MSF_BLOCK[bx] ; DX:AX = record of block
03CE 03C1 add ax,cx
03D0 83D200 adc dx,0 ; add in amount just xfered
03D3 268A4F20 mov cl,es:MSF_CR[bx]
03D7 32ED xor ch,ch ; now add in CR as a word
03D9 03C1 add ax,cx
03DB 83D200 adc dx,0 ; DX:AX = record
03DE 8AF2 mov dh,dl ; DH:AX = record for common code
03E0 EB1C 03FE jmps fcb_update_common
fcb_update_rr:
;-------------
; On Entry:
; CX = byte count actually transferred
; On Exit:
; CX = record count transferred
; All other regs fair game
; Random Record and CR/BLOCK updated with new value
;
03E2 91 xchg ax,cx
03E3 33D2 xor dx,dx ; DX:AX = byte count transfered
03E5 E8B4FF 039C call fcb_point ; ES:BX -> FCB
03E8 26F7770E div es:MSF_RECSIZE[bx] ; make records xfered
03EC 50 push ax ; save records xfered
03ED 26014721 add es:MSF_RR[bx],ax ; update the RR field
03F1 2680572300 adc es:MSF_RR2[bx],0 ; and the overflow
03F6 268B4721 mov ax,es:MSF_RR[bx] ; get low part of RR
03FA 268A7723 mov dh,es:MSF_RR2[bx] ; and the hi part
fcb_update_common:
03FE 8AD4 mov dl,ah ; DX will be block number
0400 D0E0 shl al,1 ; get top bit of CR into CY
0402 13D2 adc dx,dx ; then into DX
0404 D0E8 shr al,1 ; AL = CR (remember mod 128)
0406 26884720 mov es:MSF_CR[bx],al ; set the CR field
040A 2689570C mov es:MSF_BLOCK[bx],dx ; and the block field
040E 59 pop cx ; recover records xfered
040F C3 ret
fcb_seek_seq:
;------------
; Seek to position in file indicated by the RR position
; On Entry:
; ES:BX -> FCB_
; On Exit:
; CY clear if no problem, fcb_pb+2=IFN
; else
; CY set, AX = BX = error code
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 31
; All other regs fair game
;
0410 E889FF 039C call fcb_point ; ES:BX -> FCB_
0413 B88000 mov ax,128
0416 26F7670C mul es:MSF_BLOCK[bx] ; get record in DX:AX
041A 268A4F20 mov cl,es:MSF_CR[bx]
041E 32ED xor ch,ch
0420 03C1 add ax,cx ; add in CR
0422 83D200 adc dx,0 ; so DX:AX is really the record
0425 50 push ax ; save low word of record
0426 8BC2 mov ax,dx
0428 26F7670E mul es:MSF_RECSIZE[bx] ; DX:AX = byte offset in file/10000h
042C 8BC8 mov cx,ax ; save the important word
042E 58 pop ax ; recover low word of record
042F EB13 0444 jmps fcb_seek_common
fcb_seek_rr:
;-----------
; Seek to position in file indicated by the RR position
; On Entry:
; ES:BX -> FCB_
; On Exit:
; CY clear if no problem, fcb_pb+2=IFN
; else
; CY set, AX = BX = error code
; All other regs fair game
;
0431 E868FF 039C call fcb_point ; ES:BX -> FCB_
0434 268A4723 mov al,es:MSF_RR2[bx]
0438 32E4 xor ah,ah
043A 26F7670E mul es:MSF_RECSIZE[bx] ; DX:AX = byte offset in file/10000h
043E 8BC8 mov cx,ax ; save the important word
0440 268B4721 mov ax,es:MSF_RR[bx]
fcb_seek_common:
0444 26F7670E mul es:MSF_RECSIZE[bx] ; DX:AX = byte offset in file
0448 03D1 add dx,cx ; add the two bits together
044A A30400 E mov fcb_pb+4,ax
044D 89160600 E mov fcb_pb+6,dx ; save position
0451 C70608000000 E mov fcb_pb+8,0 ; seek from start
0457 33C0 xor ax,ax
0459 268A4718 mov al,es:MSF_IFN[bx] ; AX = IFN
045D A30200 E mov fcb_pb+2,ax ; save IFN
0460 B84200 mov ax,MS_X_LSEEK
0463 E9AB00 0511 jmp fcb_fdos ; try and seek to this position
fcb_search:
;----------
; On Entry:
; AX = operation to perform
; On Exit:
; AX = 0, or ED_ error code (CY set if error)
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 32
0466 FF360000 E push dma_offset
046A FF360000 E push dma_segment
046E C70600000000 E mov dma_offset,offset fcb_search_buf
0474 8C1E0000 E mov dma_segment,ds
0478 E89600 0511 call fcb_fdos ; do the search
047B 8F060000 E pop dma_segment
047F 8F060000 E pop dma_offset
0483 85C0 test ax,ax ; was there an error
0485 F9 stc ; assume there was
0486 7802 048A js fcb_search10 ; return the error
0488 33C0 xor ax,ax ; no problems
fcb_search10:
048A C3 ret
fcb_save_search_state:
;---------------------
; On entry DS=PCMODE
048B E80EFF 039C call fcb_point
048E 8D7F01 lea di,MSF_NAME[bx] ; ES:DI -> FCB name
0491 BE0000 E mov si,offset fcb_search_buf
0494 AC lodsb ; get 1st byte = drive info
0495 B90A00 mov cx,20/WORD ; copy 20 bytes to FCB
0498 F3A5 rep movsw ; (the rest of the search template)
049A AA stosb ; drive info byte follow them
049B C43E0000 E les di,dword ptr dma_offset ; ES:DI -> search state in DMA address
049F 8B7602 mov si,2[bp] ; SI -> parameter block
04A2 C57402 lds si,2[si] ; DS:SI -> FCB_
04A5 803CFF cmp ds:MSF_EXTFLG[si],0ffh ; extended FCB ?
04A8 7505 04AF jne fcb_sss10
04AA B90700 mov cx,7 ; copy extended FCB portions too
04AD F3A4 rep movsb ; we have copied up to name
fcb_sss10:
04AF AA stosb ; save drive byte info
04B0 57 push di
04B1 B020 mov al,' ' ; space fill name
04B3 B90B00 mov cx,11
04B6 F3AA rep stosb ; all blanks now
04B8 5F pop di
04B9 161F push ss ! pop ds ; DS:SI -> pathname
04BB BE1E00 E mov si,offset fcb_search_buf+1Eh
04BE 57 push di ; unparse knowing name is good
04BF B90800 mov cx,8 ; length of name field
fcb_sss20:
04C2 AC lodsb ; treat '.' and '..' specially
04C3 3C2E cmp al,'.' ; is either possible ?
04C5 7505 04CC jne fcb_sss30 ; no, continue as normal
04C7 AA stosb ; copy the '.'
04C8 E2F8 04C2 loop fcb_sss20 ; go around for another '.'
04CA EB04 04D0 jmps fcb_sss40 ; this name is rubbish!!
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 33
fcb_sss30:
04CC 4E dec si ; forget the non '.'
04CD E80000 E call parse_one ; parse just the name
fcb_sss40:
04D0 5F pop di
04D1 83C708 add di,8 ; di -> fcb ext field
04D4 3C2E cmp al,'.' ; do we have an extention ?
04D6 7508 04E0 jne fcb_sss50
04D8 B90300 mov cx,3 ; length of ext field
04DB 57 push di
04DC E80000 E call parse_one ; parse just extension
04DF 5F pop di
fcb_sss50:
04E0 83C703 add di,3 ; di -> rest of fcb
04E3 BE1500 E mov si,offset fcb_search_buf+15h
04E6 A4 movsb ; copy the attribute field
04E7 33C0 xor ax,ax
04E9 B90500 mov cx,10/WORD
04EC F3AB rep stosw ; 10 bytes of zeros
04EE A5 movsw ; copy time
04EF A5 movsw ; copy date
04F0 A12F00 E mov ax,word ptr srch_buf+21+DBLOCK1
04F3 AB stosw ; 1st block
04F4 A5A5 movsw ! movsw ; copy filesize
04F6 C3 ret
fcb_restore_search_state:
;------------------------
; On entry DS=PCMODE
04F7 1E push ds
04F8 E8A1FE 039C call fcb_point ; ES:BX -> FCB_
04FB 061E push es ! push ds
04FD 071F pop es ! pop ds ; swap DS/ES
04FF BF0100 E mov di,offset fcb_search_buf+1
; ES:DI -> internal state
0502 8D7701 lea si,1[bx] ; DS:SI -> FCB+1
0505 B90A00 mov cx,10
0508 F3A5 rep movsw ; copy info from FCB
050A AC lodsb ; get "drive" info
050B 26A20000 E mov es:fcb_search_buf,al ; it's the 1st byte in the srch state
050F 1F pop ds
0510 C3 ret
fcb_fdos:
;--------
; Make an FDOS call (NB. We don't have MX here, so it's OK)
; Set top bit of remote_call flag so we use IFN's not XFN's
; On Entry:
; AX = FDOS operation
; fcb_pb -> FDOS parameter block
; On Exit:
; As FDOS call
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 34
;
0511 A30000 E mov fcb_pb,ax ; save operation type
0514 810E00000080 E or remote_call,DHM_FCB ; forget about PSP during FCB call
051A BA0000 E mov dx,offset fcb_pb ; DS:DX -> parameter block
051D 1E push ds
051E 55 push bp
051F E80000 E call fdos_entry ; call the FDOS
0522 5D pop bp
0523 1F pop ds
0524 81260000FF7F E and remote_call,not DHM_FCB ; FCB operation over
052A 3DA6FF cmp ax,ED_LASTERROR
052D F5 cmc ; CY set if an error occurred
052E C3 ret
div_32:
; Entry: DX,AX = long dividend
; CX = word divisor
; Exit: DX,AX = long result
; CX = remainder
052F E31F 0550 jcxz div0 ; divide by 0
0531 83F901 cmp cx,1
0534 7420 0556 je div1 ; divide by 1
0536 57 push di
0537 53 push bx
0538 33DB xor bx,bx ; BX = 0
053A 93 xchg ax,bx ; low word in BX, AX = 0
053B 92 xchg ax,dx ; high word in DX:AX
053C 50 push ax ; save high word
053D F7F1 div cx ; divide high part
053F 8BF8 mov di,ax ; save result
0541 F7E1 mul cx ; AX = even divisor part
0543 5A pop dx ; old high in DX
0544 2BD0 sub dx,ax ; eliminate even part
0546 93 xchg ax,bx ; AX = low word
0547 F7F1 div cx ; low part in AX
0549 8BCA mov cx,dx ; CX = remainder
054B 8BD7 mov dx,di ; high result in DX
054D 5B pop bx
054E 5F pop di
054F C3 ret
div0:
0550 B8FFFF mov ax,-1
0553 8BD0 mov dx,ax
0555 C3 ret
div1:
0556 49 dec cx ; CX = remainder = 0
0557 C3 ret
PCMODE_DATA DSEG WORD
PC-DOS RASM-86 1.4a Source: FCBS.A86 FCB - DOS file system FCB supp Page 35
extrn fcb_pb:word
extrn fcb_path:byte
extrn fcb_path2:byte
extrn fcb_search_buf:byte
extrn current_dsk:byte
extrn current_psp:word
extrn dma_offset:word
extrn dma_segment:word
extrn machine_id:word
extrn remote_call:word
extrn srch_buf:byte
end
End of assembly. Number of errors: 0. Use factor: 23%
 extrn fcb_search_buf:byte
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