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https://github.com/PDP-10/its.git
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53f2a2eba9
Binary-only compiler and library, plus documentation and include files for compiling new programs.
105 lines
3.6 KiB
C
Executable File
105 lines
3.6 KiB
C
Executable File
/* -*-C-*-
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* ITS filesystem definitions
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*
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* Defines the format of binary MFDs and UFDs for use by C programs.
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*/
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/*
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** MFD INFO
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*/
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/* RANDOM INFO IN MFD */
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#define MDNUM 0 /* ASCENDING DIR NUM */
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#define MDNAMP 1 /* PNTR TO ORG OF USER NAME BLOCK AREA */
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#define MDYEAR 2 /* CURRENT YEAR */
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#define MPDOFF 3 /* DE-CORIOLIS CLOCK OFFSET */
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#define MPDWDK 4 /* PREFERRED WRITING DISK (PHYSICAL DRIVE #) */
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#define MDCHK 5 /* THIS WORD MUST BE M.F.D. (FOR CHECKING) */
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#define MDNUDS 6 /* NUMBER USER DIRECTORIES (FOR CHECKING ONLY) */
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#define LMIBLK 7 /* TOTAL STG USED BY HACKS LIKE THIS */
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/* USER NAME BLKS FROM C(MDNAMP) TO END */
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#define LMNBLK 2 /* # WDS/BLK */
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#define MNUNAM 0 /* 6BIT USER NAME */
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/*
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** UFD INFO
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*/
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#define UFDBYT 6 /* SIZE OF BYTES */
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#define UFDBPW (36 / UFDBYT) /* NUMBER OF BYTES PER WORD */
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/* RANDOM INFO IN UFD */
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#define UDESCP 0 /* FS PNTR TO DESC AREA */
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#define UDNAMP 1 /* PNTR TO ORG OF NAME AREA */
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#define UDNAME 2 /* USER NAME (FOR CHECKING) */
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#define UDBLKS 3 /* LEFT HALF HAS AMOUNT OF SPACE ALLOCATED (NOT */
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/* USED CURRENTLY BY SYSTEM), RIGHT HALF HAS */
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/* NUMBER OF BLOCKS USED. */
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#define UDALLO 4 /* IF NONZERO, LEFT HALF HAS DISK NUMBER, RIGHT */
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/* HALF HAS AMOUNT OF SPACE ALLOCATED */
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#define UDDESC 11 /* FIRST LOC AVAIL FOR DESC */
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/* UFD DESCRIPTORS
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** 0 => FREE 1-UDTKMX => TAKE NEXT N
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** UDTKMX+1 THRU UDWPH-1 => SKIP N-UDTKMX AND TAKE ONE
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** UDWPH => WRITE-PLACE-HOLDER
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** 040 BIT SET => LOAD ADDRESS. LOWER 5 BITS PLUS NEXT NXLBYT (2)
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** CHARS (17 BITS IN ALL)
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** 040 BIT & 020 BIT => "FUNNY" BLOCK IF DMDSK. WHAT IS THIS, ANYWAY?
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** END BY 0
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**
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** IF LINK DESCR
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** 6 CHAR OR UNTIL ; = SYS NAME. MUST HAVE NO CHAR = 0 IN THIS OR
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** NEXT 2 NAMES
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** NEXT CHAR QUOTED BY : (FOR NAMES WITH : OR ;)
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** NEXT CHAR N1
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** NEXT CHAR N2
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** END BY 0
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*/
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#define UDTKMX 12 /* HIGHEST "TAKE N" CODE */
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#define UDWPH 31 /* PLACE HOLDER ON WRITE (OR NULL FILE) */
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#define UDSKMX (UDWPH - UDTKMX - 1) /* # BLOCKS THAT CAN BE SKIPPED */
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#define NXLBYT 2 /* # ADDITIONAL BYTES FOR LOAD ADDR */
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/* NAME AREA DATA */
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#define LUNBLK 5 /* WDS/NAME BLK */
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#define UNFN1 0 /* FIRST FN */
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#define UNFN2 1 /* SECOND FN */
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#define UNRNDM 2 /* ALL KINDS OF RANDOM INFO */
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#define UNDSCP 0001500000000 /* PNTR TO DESC */
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#define UNPKN 0150500000000 /* PACK # */
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#define UNLINK 01000000 /* LINK BIT */
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#define UNREAP 02000000 /* IF 1, DONT REAP FILE */
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#define UNWRIT 04000000 /* OPEN FOR WRITING */
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#define UNMARK 010000000 /* GC MARK BIT */
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#define UNCDEL 020000000 /* DEL WHEN CLOSED */
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#define DELBTS 020000000 /* DELETED -- IGNORE */
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#define UNIGFL 024000000 /* BITS TO IGNORE FILE */
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#define UNWRDC 0301200000000 /* WORD COUNT OF LAST BLOCK MOD 2000 */
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#define UNDUMP 0400000000000 /* HAS BEEN DUMPED */
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#define UNDATE 3 /* DATE ETC. */
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#define UNTIM 0002200000000 /* COMPACTED TIME OF CREATION */
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#define UNYMD 0222000000000 /* Y,M,D OF CREATION */
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#define UNMON 0270400000000 /* MONTH */
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#define UNDAY 0220500000000 /* DAY */
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#define UNYRB 0330700000000 /* YEAR */
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#define UNREF 4 /* REFERENCE DATE SAME AS LEFT HALF OF UNDATE */
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#define UNREFD 0222000000000 /* REFERENCE DATE */
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#define UNAUTH 0111100000000 /* MFD INDEX OF AUTHOR, ALL 1=> NO */
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/* DIRECTORY */
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#define UNBYTE 0001100000000 /* FILE BYTE SIZE AND LENGTH INFO. */
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/* LET S=BITS PER BYTE, C=COUNT OF UNUSED BYTES
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** IN LAST WD
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** 400+100xS+C S=1 TO 3 C=0 TO 35.
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** 200+20xS+C S=4 TO 7 C=0 TO 8
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** 44+4xS+C S=8 TO 18. C=0 TO 3
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** 44-S S=19. TO 36. C=0
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** NOTE THAT OLD FILES HAVE UNBYTE=0 => S=36.
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*/
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