DOS 3.30 source code leak
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; SCCSID = @(#)dossym.asm 1.1 85/04/10; SCCSID = @(#)dossym.asm 1.1 85/04/10 PAGE 80,132TRUE EQU 0FFFFhFALSE EQU 0
Installed = TRUEIFNDEF DEBUG DEBUG = FALSEENDIF
include dosmac.INC
include VERSIONA.INC
;;IF2;; %OUT DOSSYM in Pass 2;;ENDIF
BREAK <Control character definitions>
c_DEL EQU 7Fh ; ASCII rubout or delete previous charc_BS EQU 08h ; ^H ASCII backspacec_CR EQU 0Dh ; ^M ASCII carriage returnc_LF EQU 0Ah ; ^J ASCII linefeedc_ETB EQU 17h ; ^W ASCII end of transmissionc_NAK EQU 15h ; ^U ASCII negative acknowledgec_ETX EQU 03h ; ^C ASCII end of textc_HT EQU 09h ; ^I ASCII tab
BREAK <Read This and Weep>
;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;; ;; C A V E A T P R O G R A M M E R ;; ;; Certain structures, constants and system calls below are private to ;; the DOS and are extremely version-dependent. They may change at any ;; time at the implementors' whim. As a result, they must not be ;; documented to the general public. If an extreme case arises, they ;; must be documented with this warning. ;; ;; Those structures and constants that are subject to the above will be ;; marked and bracketed with the flag: ;; ;; C A V E A T P R O G R A M M E R ;; ;;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
include bpb.INC
include buffer.INC
BREAK <User stack inside of system call and SysVars>; Location of user registers relative user stack pointer
user_environ STRUCuser_AX DW ?user_BX DW ?user_CX DW ?user_DX DW ?user_SI DW ?user_DI DW ?user_BP DW ?user_DS DW ?user_ES DW ?user_IP DW ?user_CS DW ?user_F DW ?user_environ ENDS
include sysvar.INC
include vector.INC
include mult.INC
BREAK <Disk map>; MSDOS partitions the disk into 4 sections:;; phys sector 0: +-------------------+; | | boot/reserved |; | +-------------------+; | | File allocation |; v | table(s) |; | (multiple copies |; | are kept) |; +-------------------+; | Directory |; +-------------------+; | File space |; +-------------------+; | Unaddressable |; | (to end of disk) |; +-------------------+;; All partition boundaries are sector boundaries. The size of the FAT is; adjusted to maximize the file space addressable.
include dirent.INC
BREAK <File allocation Table information>;; The File Allocation Table uses a 12-bit entry for each allocation unit on; the disk. These entries are packed, two for every three bytes. The contents; of entry number N is found by 1) multiplying N by 1.5; 2) adding the result; to the base address of the Allocation Table; 3) fetching the 16-bit word; at this address; 4) If N was odd (so that N*1.5 was not an integer), shift; the word right four bits; 5) mask to 12 bits (AND with 0FFF hex). Entry; number zero is used as an end-of-file trap in the OS and is passed to the; BIOS to help determine disk format. Entry 1 is reserved for future use.; The first available allocation unit is assigned entry number two, and even; though it is the first, is called cluster 2. Entries greater than 0FF8H; (12-bit fats) or 0FFF8H (16-bit fats) are end of file marks; entries of zero; are unallocated. Otherwise, the contents of a FAT entry is the number of; the next cluster in the file.;; Clusters with bad sectors are tagged with FF7H. Any non-zero number would; do because these clusters show as allocated, but are not part of any; allocation chain and thus will never be allocated to a file. A particular; number is selected so that disk checking programs know what to do (ie. a; cluster with entry FF7H which is not in a chain is not an error).
include dpb.INC
include curdir.INC
include cpmfcb.INC
include find.INC
include pdb.INC
include exe.INC
include sf.INC
include arena.INC
include intnat.INC
include mi.INC
fChk equ 1fDelim equ 2fSpChk equ 4fFCB equ 8
include filemode.INC
include error.INC
include syscall.INC
SUBTTL
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