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7-sources/edt-helper.mac
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TITLE HELPER - OBTAIN HELP
SEARCH MONSYM,MACSYM
SALL
TWOSEG
;******************************************************************************
;* *
;* COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATIO 1975, 1988 ALL RIGHTS RESERVED.*
;* *
;* THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED *
;* ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE *
;* INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER *
;* COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY *
;* OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY *
;* TRANSFERRED. *
;* *
;* THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE *
;* AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT *
;* CORPORATION. *
;* *
;* DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS *
;* SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL. *
;* *
;******************************************************************************
;
;This module searches a structured help library file for information on
;a given topic and subtopic. The structure of the file is described in
;the source file for the librarian.
;
;On entry the user must supply a FORTRAN or COBOL type argument block in
;the following format:
;
; -CNT,,0
; AP-> [Pointer to command string]
; [Pointer to facility name]
; [Pointer to filespec to search or jfn of file]
; [Pointer to flags,,terminal width]
; [Address of error code]
;
;Defaults are as follows:
;
;Command string: null - this supplies only level-0 text
;Facility name: program name
;File specification: first - HLP:SYSHLP.HLB
; then - HLP:facility.HLB
; then - DSK:facility.HLB
;Flags and width: 0,,80.
;Errors: returned in AC0
;
;Edit history:
;
;1 Don't check for ambiguities on an exact match. CJG 6-Jul-1983
;2 Fix a format problem in ALSO:. CJG 6-Jul-1983
SUBTTL DEFINITIONS
;User settable flags
HL.NFC==1B0 ;Don't list facility name in title
HL.NLT==1B1 ;Don't list title
HL.NLS==1B2 ;Don't list sub-levels after main text
HL.NSD==1B3 ;Don't search default files
;Internal flags
HL.SHT==1B9 ;Entered via .HELPR
HL.ERR==1B10 ;Error code address was given
HL.FSP==1B11 ;Filespec was given
HL.FAC==1B12 ;Facility name was given
HL.STR==1B13 ;Command string was given
HL.NRJ==1B14 ;Don't release the jfn
HL.HLP==1B15 ;User command was HELP
;Error codes
E.OPNF=1 ;Failed to open the help file
E.ALOC=2 ;Failed to allocate memory
E.FCNF=3 ;Facility not found
E.TPNF=4 ;Topic not found and HL.NAS was set
E.TERM=5 ;Terminal width less than 20
;Internal parameters
FILPGS=^D8 ;Number of pages to map if possible
;
;AC definitions
;
Z=0
A=1
B=2
C=3
D=4
E=5
F=6 ;Flags
AP=16 ;Argument pointer
P=17 ;Stack pointer
;Useful characters
SPACE=40
TAB=11
;
;Offsets into HEADR0
;
.LVERS=1 ;Librarian version number
.LTXTP=2 ;Pointer to text area
.LKEY0=3 ;Pointer to level-0 key names
.LMAXK=4 ;Length of longest key name
SUBTTL LOCAL DATA AREA
RELOC 0
HEADR0: BLOCK 10 ;Library header data
USRACS: BLOCK 17 ;Copy of user AC's
KEYSPC: 0 ;[2] Spaces allowed per key
FILPAG: 0 ;Page number where file data is held
FILADR: 0 ;Address of file data
FILJFN: 0 ;JFN of help file
LEVEL: 0 ;Current level
LVL0LN: 0 ;Length of level-0 table
LVL1P: 0 ;Pointer to level-1 table
PGMAP: 0 ;Page number of first file page
PGSMPD: 0 ;Number of file pages mapped
TBLPTR: 0 ;Pointer to next table
UFLAGS: 0 ;Copy of user flags
TXTADR: 0 ;Base address of text
TXTPTR: 0 ;Offset to text
NXTKEY: 0 ;Pointer to next key in string
TBLERR: 0 ;Count of table errors detected
FILOPN: 0 ;-1 when file is open
DEFSET: 0 ;Status of defaulting
FSPACE: 0 ;Flag for space compression
FILSPC: 0 ;Address of current file spec
USRFIL: BLOCK 6 ;User supplied filespec
USRFSP: BLOCK 20 ;Users file spec
SYSFIL: ASCIZ /HLP:SYSHLP.HLB/ ;Default system help file
FACNAM: BLOCK 4 ;Facility name
USRCMD: BLOCK 20 ;User supplied command
HDRPTR: 0 ;Pointer into header buffer
LINBUF: BLOCK ^D21 ;Room for a full line of text
GTJBLK: GJ%OLD ;GTJFN block
.NULIO,,.NULIO
POINT 7,[ASCIZ /HLP/]
0
POINT 7,FACNAM
POINT 7,[ASCIZ /HLB/]
0
0
0
SUBTTL ENTRY POINTS
RELOC 400000
HELPER::
MOVEM Z,USRACS ;Save users AC's
MOVE Z,[1,,USRACS+1]
BLT Z,USRACS+16
SETZM USRCMD ;Set defaults - user command
GETNM ;Get program name
MOVE B,[POINT 7,FACNAM]
CALL SIX2A ;And convert to ASCII
MOVE A,[POINT 7,SYSFIL] ;Default filespec
MOVEM A,FILSPC
MOVEI F,^D80 ;Flags,,width
MOVEM F,UFLAGS
HLRO A,-1(AP) ;Get argument count
MOVNS A
JRST @[HLP.4B ;No arguments supplied
HLP.4 ;String only
HLP.3 ;+ facility
HLP.2 ;+ filespec
HLP.1 ;+ flags
.+1](A) ;+ error
TXO F,HL.ERR ;Error code found
SETZM @4(AP) ;Clear it
HLP.1:
MOVE A,@3(AP) ;Get user flags
TLZ A,777 ;Clear any internal flags
HRRZ B,A ;Copy terminal width
SKIPN B ;If zero,
MOVEI B,^D80 ; Then default to 80
CAIG B,^D20 ;See if its too small
JRST [MOVEI Z,E.TERM ;Terminal too narrow
JRST ENDHLP]
HRR F,B ;Copy the width
HLLZS A
TDO F,A ;Copy the flags
MOVEM F,UFLAGS
HLP.2:
MOVE A,@2(AP) ;Get address of filespec
TDNN A,[-100] ;See if it could be a jfn
JRST [TXO F,HL.NRJ!HL.NSD ;Yes - don't search other files
MOVEM A,FILJFN ;Save the jfn
JRST HLP.3]
ADDI AP,2 ;Point to filespec descriptor
MOVE B,[POINT 7,USRFSP] ;Point to storage area
MOVEI D,^D80
SETOM FSPACE ;No spaces allowed
CALL MOVSTR
CAIA ;Null string
TXO F,HL.FSP
HLP.3:
MOVE AP,USRACS+AP ;Restore AP
ADDI AP,1 ;Point to facility descriptor
MOVE B,[POINT 7,FACNAM]
MOVEI D,^D20 ;Up to 20 chars
SETOM FSPACE ;No spaces allowed
CALL MOVSTR
CAIA ;Null string
TXO F,HL.FAC
HLP.4:
MOVE AP,USRACS+AP ;Restore AP
MOVE B,[POINT 7,USRCMD] ;Point to destination
MOVEI D,^D80 ;Up to 80 chars
SETZM FSPACE ;Compress spaces
CALL MOVSTR ;Copy the string
JRST HLP.4B ;Null string
TXO F,HL.STR
MOVEI A,5
MOVE B,[POINT 7,USRCMD] ;See if the user said "HELP"
MOVEI D,5
MOVE E,[POINT 7,[ASCIZ /HELP/]]
EXTEND A,[CMPSN]
TXO F,HL.HLP ;Yes - go to ALSO later on
JRST HLP.5
HLP.4B:
MOVE A,[ASCIZ /HELP/] ;Default to "HELP"
MOVEM A,USRCMD
TXO A,HL.HLP ;Set the flag
JRST HLP.5
;
;Alternate entry point - .HELPR
;
;When entering here, AC1 must contain the facility name in sixbit
;and errors will be returned in AC0.
;
.HELPR::
MOVEM Z,USRACS ;Save users AC's
MOVE Z,[1,,USRACS+1]
BLT Z,USRACS+16
SETZM USRCMD ;Set some defaults
SKIPN A
GETNM ;Use program name by default
MOVE B,[POINT 7,FACNAM]
CALL SIX2A ;Convert to ASCII
MOVE A,[POINT 7,SYSFIL]
MOVEM A,FILSPC
MOVE F,[HL.NLS!HL.SHT!HL.FAC+^D80]
MOVEM F,UFLAGS
;Now fall back into the main line
SUBTTL OPEN THE FILE AND FIND ENTRY
HLP.5:
SETZM LEVEL ;Clear the level counter
SETZM FILPAG ;Start at zero
SETZM FILOPN ;File not open yet
SETOM DEFSET ;Defaulting not started
MOVEI D,FILPGS ;Number of pages to find
MOVEM D,PGSMPD
CALL FNDPAG ;Find some free pages
FNDFIL: ;Try to find a file to use
MOVE A,[POINT 7,LINBUF]
MOVEM A,HDRPTR ;Preset pointer to header message
TXNE F,HL.NRJ ;If NRJ is set, then JFN was supplied
JRST FNF.1
MOVEI A,GTJBLK ;Point to the GTJFN block
MOVE B,FILSPC
GTJFN ;Get a JFN
JRST NXTFLX ; Can't - try another
HRRZM A,FILJFN ;Save the JFN
FNF.1:
MOVE A,FILJFN ;Get the jfn
MOVEI B,OF%RD!OF%DUD ;Open as 36-bit, read, no update
OPENF
JRST [MOVE A,FILJFN ;Failed - release the JFN
RLJFN
JFCL
JRST NXTFLX] ;And try another one
HRLZ A,FILJFN
MOVE B,FILPAG
MOVE C,[PM%CNT!PM%RD+2]
PMAP ;Map the first two pages of the file
ERJMP MAPERR
SETZM PGMAP
MOVEI A,2 ;Save the counter
MOVEM A,PGSMPD
MOVEI A,HEADR0 ;Set up a BLT pointer
HRL A,FILADR
BLT A,HEADR0+7 ;Copy the header info
MOVE A,HEADR0 ;Get length of level-0 table in words
ANDI A,777
SKIPN A
MOVEI A,1 ;Default to one page
LSH A,^D9
MOVEM A,LVL0LN ;Save for corrections
HRRZ B,HEADR0+.LMAXK ;[2] Length of longest key
ADDI B,2 ;[2]
MOVEM B,KEYSPC ;[2] And save it
MOVE A,FILADR
ADDI A,10 ;Point to table
MOVE B,[POINT 7,FACNAM]
PUSH P,A
CALL GETKEY ;Find length of key
POP P,A
CALL TBLUKP ;Try to find an entry
JRST [CALL FCLOSE ;Can't find it - close the file
JRST NXTFIL] ;And try another one
HRRZM B,TXTADR ;Save the text base address
MOVEM A,TBLPTR ;Save as first pointer
MOVEM A,LVL1P ;Save for later
SETOM FILOPN ;File is now open OK
TXNN F,HL.NFC ;If allowed -
CALL MOVKY2 ;Save the key for the title
SKIPN USRCMD ;Is there any key there?
JRST DOTEXT ; No - just do text
CALL LV1PAG ;Get the level-1 table
MOVE B,[POINT 7,USRCMD]
MOVEM B,NXTKEY ;Preset pointer to keys
SETZM TXTPTR ;Clear the offset
FNDNXT:
MOVE B,NXTKEY ;Point to the string
CALL GETKEY ;Find it
JUMPE C,DOTEXT ;Done - do text
HRRZ A,TBLPTR
JUMPE A,AMBTOP ;Ambiguous or undefined topic
SKIPN LEVEL
SUB A,LVL0LN ;Correct if last was level-0
ADD A,FILADR ;Point to memory
CALL TBLUKP ;Look for entry
JRST AMBTOP ;Not found
AOS LEVEL ;Another one done
HRRZM B,TXTPTR ;Save the pointers
MOVEM A,TBLPTR
CALL MOVKY2 ;Copy for header or error
JRST FNDNXT ;Loop for next one
DOTEXT:
CALL UNMAP ;Lose the current table
TMSG <
>
MOVE A,TXTADR ;Get the file address of the text
ADD A,TXTPTR
LSH A,-^D9 ;Make a page number
HRL A,FILJFN
MOVE B,FILPAG
MOVE C,[PM%CNT!PM%RD+2]
HRRZM C,PGSMPD
PMAP ;Get the text (which may spill over)
ERJMP MAPERR
TXNN F,HL.NLT ;List title?
CALL DOLINE ;Type the header
MOVE A,TXTPTR
ANDI A,777 ;Point to the real memory
ADD A,FILADR
HRLI A,(POINT 7,0) ;Make a byte pointer
PSOUT
TXNN F,HL.HLP ;If the command was HELP
JRST ALSO
MOVE A,LVL0LN ;Then force level-1 to be listed
MOVEM A,TBLPTR ;By setting the pointer to level-1
SETZM LEVEL ;And pretending we are at level-0
JRST ALSO
SUBTTL AMBIGUOUS AND ALSO ROUTINES
AMBTOP:
TXNN F,HL.NLS ;Can we list any more?
JRST AMB.1 ;Yes
CALL FCLOSE ;No - close the file
MOVEI Z,E.TPNF ;Say topic not found
JRST ENDHLP
AMB.1:
PUSH P,B
PUSH P,C
MOVE B,[POINT 7,[ASCIZ /Sorry, no help available on
/]]
SKIPE A
MOVE B,[POINT 7,[ASCIZ /Ambiguous command
/]]
MOVEI A,.PRIOU
SETZB C,D
SOUT ;Send a message
POP P,C
POP P,B
CALL COPKEY ;Copy the erroneous key
CALL DOLINE ;Output the string
MOVE B,[POINT 7,LINBUF]
MOVEM B,HDRPTR ;Fall into ALSO
SKIPL FILOPN ;If a file is not open
JRST DONE ;Then no more
ALSO:
HRRZ A,TBLPTR
SKIPE A ;Anything to print?
TXNE F,HL.NLS ;Should we print extras?
JRST DONE ;No - just finish up
TMSG <
>
CALL LV1PAG ;Get level-1 table again
HRRZ A,UFLAGS ;See how many keys per line can
SUBI A,5 ;Be sent to the terminal
IDIV A,KEYSPC ;[2]
PUSH P,A
HRROI A,[ASCIZ /Further information is available on the following:
/]
PSOUT
HRRZ A,TBLPTR
SKIPN LEVEL ;If last was level-0
SUB A,LVL0LN ;Then correct the pointer
ADD A,FILADR ;Point to the actual table
MOVN B,(A) ;Make an AOBJN pointer
HRL A,B
ADDI A,1 ;Point to first real entry
MOVE B,[POINT 7,LINBUF]
MOVEM B,HDRPTR ;Preset the pointer
ALS.1:
MOVE C,(P) ;Pick up the counter
CALL MOVKEY ;Copy the entry
JRST ALS.2 ;Done
SOJG C,.-2
PUSH P,A
CALL DOLINE ;Output the line
POP P,A
MOVE B,[POINT 7,LINBUF]
MOVEM B,HDRPTR ;Reset the pointer
JRST ALS.1
ALS.2:
ADJSP P,-1
CALL DOLINE ;Do the last line
DONE:
CALL FCLOSE
SETZ Z, ;No error now
ENDHLP: ;Restore AC's and return
PUSH P,Z
MOVE Z,[USRACS+1,,1]
BLT Z,16 ;Restore the AC's
POP P,Z ;And the error code
RET
SUBTTL NEXT FILE ROUTINE
NXTFLX: ;See if we can do any more
TXNN F,HL.NSD
JRST NXF.0
MOVEI Z,E.OPNF ;Could not open the file
JRST ENDHLP
NXTFIL:
TXNN F,HL.NSD ;Not found - try another?
JRST NXF.0
SETZ A,
TXNN F,HL.NLS
JRST AMBTOP
MOVEI Z,E.TPNF
JRST ENDHLP
NXF.0:
HRRZ A,FILSPC ;Have we tried system default?
CAIN A,USRFIL
JRST [MOVE A,[POINT 7,SYSFIL]
MOVEM A,FILSPC ;No - do it now
JRST FNDFIL]
SKIPL DEFSET ;Has defaulting been started?
JRST NXF.1 ;Yes
SETZM FILSPC ;Default to HLP:facility.HLB
AOS DEFSET ;Now at first level
JRST FNDFIL
NXF.1:
SKIPE DEFSET ;What state are we in?
JRST [SETZ A, ;Done them all - fail
TXNN F,HL.NLS
JRST AMBTOP
MOVEI Z,E.TPNF
JRST ENDHLP]
MOVE A,[POINT 7,[ASCIZ /DSK:/]]
MOVEM A,FILSPC ;Try the last option DSK:facility.HLB
AOS DEFSET
JRST FNDFIL
MAPERR:
CALL FCLOSE
MOVEI Z,E.ALOC
JRST ENDHLP
SUBTTL SIXBIT-TO-ASCII, CLOSE AND UNMAP
;
;SIX2A - convert SIXBIT to ASCII.
;On entry: A Contains the SIXBIT word
; B Contains a pointer to the destination
;
SIX2A:
MOVE C,[POINT 6,A]
SIX.1:
TLNN C,770000 ;Any more left?
JRST SIX.2 ; No
ILDB D,C ;Get a byte
SKIPN D ;If space
JRST SIX.2 ; Then end on a null
ADDI D,40 ;Convert to ASCII
IDPB D,B
JRST SIX.1
SIX.2:
SETZ D, ;Make sure we end on a null
IDPB D,B
RET
;
;FCLOSE - close a file and free any mapped pages.
;
FCLOSE:
CALL UNMAP ;Unmap the pages
HRRZ A,FILJFN
TXNE F,HL.NRJ ;If we can't release the jfn
TXO A,CO%NRJ ;Then flag it
CLOSF ;Close the file
JFCL
RET
;
;UNMAP - unmap the pages currently mapped from the file
;
UNMAP:
SKIPN C,PGSMPD
RET ;Nothing to do
SETO A,
MOVE B,FILPAG
HRLI C,(PM%CNT+PM%ABT)
PMAP ;Unmap the pages
SETZM PGSMPD ;None mapped now
RET
SUBTTL TABLE LOOKUP ROUTINES
;
;TBLUKP - lookup an entry in a table and check for non-existant
;entries or ambiguous values. A flag is also set when the table
;has an inconsistancy - but we don't die here.
;
;On entry: A = base address of table
; B = Byte pointer to the string
; C = length of string
;
;On exit: A = Contents of second word of table
; B = Address of text (uncorrected)
;
;Non-skip: A = -1 if ambiguous
; A = 0 if not found
;
TBLUKP:
MOVN D,(A) ;-ve count
HRL A,D ;Make an AOBJN pointer
AOS A ;Point to first word pair
TBK.0:
CALL CHKENT ;See if the entry exists
JRST TBK.1 ; Not far enough down yet
JRST [SETZ A, ; Too far - not found
RET]
PUSH P,A ;Save the pointer
JUMPE C,TBK.3 ;[1] Exact match - don't do ambig.
AOS A
AOBJN A,.+2 ;Point to next entry
JRST TBK.3 ;End of table
CALL CHKENT ;See if its ambiguous
AOS TBLERR ; Table error
CAIA
JRST TBK.2
TBK.3:
POP P,A
MOVE B,(A) ;Address of text
MOVE A,1(A) ;Second word of table
AOS (P) ;Good return
RET
TBK.1:
AOS A
AOBJN A,TBK.0 ;Go for next entry
SETZ A,
RET ;Not found
TBK.2:
POP P,A
SETO A,
RET ;Ambiguous
;
;CHKENT - See if the current entry matches the one given.
;
;On entry: A = pointer to current entry
; B = pointer to string
; C = length of string
;
;On exit: return +1 = Current entry too low
; return +2 = Current entry too high
; return +3 = Current entry matches (may be abbrev.)
; (C is zero on an exact match)
;
CHKENT:
PUSH P,A
PUSH P,B ;Save some things
MOVE D,C
HLR E,(A) ;Form pointer to key entry
ADD E,FILADR
HRLI E,(POINT 7,0)
PUSH P,E ;Save this pointer
MOVE A,C
EXTEND A,[CMPSE] ;Compare - no need for filler
JRST CHK.1
ILDB A,E ;[1] If the next byte is a null
SKIPN A ;[1] Then it was an exact match
SETZ C, ;[1] So flag it as such
ADJSP P,-1 ;Tidy up and set for good return
AOS -2(P)
AOS -2(P)
JRST CHK.2 ;Strings are equal
CHK.1:
POP P,E
MOVE A,C
MOVE D,C ;Reset to find if too far
MOVE B,(P)
EXTEND A,[CMPSG]
AOS -2(P)
CHK.2:
POP P,B
POP P,A
RET
;
;GETKEY - Scan down the string to find its start and end. Skip leading
;spaces, tabs, and "/". End on the first space, tab, "/", or control
;character.
;
;On entry: B = pointer to string
;
;On exit: B = pointer to real start of string
; C = length of useful string
; NXTKEY = pointer to character after end of string
;
GETKEY:
PUSH P,B ;Store the 'real' start
SETZ C, ;Clear the counter
GTK.0:
ILDB D,B ;Get a byte
CAIE D,SPACE ;See if space
CAIN D,TAB ; or tab
JRST [SKIPE C ;If leading - then ignore them
JRST GTK.3
JRST GTK.1]
CAIG D,SPACE
JRST GTK.3 ;End on control caracter
GTK.2:
AOS C ;Its a reasonable character
JRST GTK.0
GTK.1:
MOVEM B,(P) ;Save this as the real pointer
JRST GTK.0
GTK.3:
MOVEM B,NXTKEY ;Save a pointer to the next part
SETO B,
ADJBP B,NXTKEY
MOVEM B,NXTKEY
POP P,B ;Restore the real pointer
RET
;
;COPKEY - copy the key just found into HDRBUF and append a space. This
;will be used either as the title for the help found or as part of the
;error message.
;
;On entry: B = pointer to key name
; C = length of key
; HDRPTR = pointer to end of buffer
;
COPKEY:
MOVE A,C
MOVEI D,1(C) ;Destination is padded
MOVE E,HDRPTR
EXTEND A,[MOVSLJ ;Move the name
SPACE] ;And add a space
JFCL
MOVEM E,HDRPTR ;Save the new pointer
RET
;
;MOVKEY - Copy a key from a level-n table into the line buffer.
;If required space out the text so that it all looks tidy.
;
MOVKY2:
HLRZ A,B ;Make a pointer to the key
ADD A,FILADR
HRLI A,(POINT 7,0)
MOVE B,HDRPTR ;Point to buffer
SETZ C, ;And flag different mode
CALL MVK.1
MOVEI A,SPACE ;Put a space in the buffer
IDPB A,B
MOVEM B,HDRPTR
RET
MOVKEY:
PUSH P,A ;Save the table pointer
PUSH P,C ;Save the item count
HLR A,(A) ;Get a pointer to the key name
ADD A,FILADR
HRLI A,(POINT 7,0)
MOVE B,HDRPTR ;Put the item here
MOVN C,KEYSPC ;[2] Up to N characters
CALL MVK.1 ;Copy the string
SKIPG C ;If the key was too long
JRST MVK.3
SUB C,KEYSPC ;[2] Then fill to the next place
CALL MVK.2
MVK.3:
MOVEM B,HDRPTR ;Save the pointer for later
POP P,C
POP P,A ;Restore the table pointer
AOS A
AOBJN A,[AOS (P) ;Skip return if not last
RET]
RET
MVK.1:
ILDB E,A ;Next byte of key name
JUMPE E,MVK.2 ;Done
IDPB E,B ;Store it
AOS C
JRST MVK.1
MVK.2:
MOVE A,-1(P) ;See if we need to append spaces
SKIPGE C ;Don't if this is the last item
CAIN A,1 ;Or we are at the end of the buffer
RET
MOVEI E,SPACE ;Space up to 20 characters
IDPB E,B
AOJN C,.-1
RET
;
;MOVSTR - copy a string from the caller. On entry FSPACE is set as follows:
;
; FSPACE = -1 terminate on the first space or tab
; FSPACE = 0 terminate on the first null, <CR>, or <LF>. Convert
; all spaces and tabs to a single space.
;
;Also on entry:
;
; B = pointer to the destination
; D = maximum string length
; AP = pointer to the argument descriptor.
;
;On return:
;
; .+1 - null string
; .+2 - OK
;
MOVSTR:
LDB A,[POINT 4,(AP),12] ;Get the argument type
CAIN A,15 ;COBOL?
JRST MVS.1 ; Yes - special
MOVEI A,@0(AP)
SKIPN A
RET ;Return if null
HRLI A,(POINT 7,0) ;And get a pointer to the string
PUSH P,D ;Save for null test
JRST MVS.2
MVS.1:
MOVEI A,@0(AP)
SKIPN D,1(A) ;Length of string (incl trailing spaces)
RET ;Null string
PUSH P,D ;Save for null test
MOVE A,0(A) ;Byte pointer
MVS.2:
ILDB C,A ;Get a byte
JUMPE C,MVS.5 ;End on <NULL>
CAIE C,15 ; Or <CR>
CAIN C,12 ; Or <LF>
JRST MVS.5
CAIE C,40 ;Is it a space
CAIN C,11 ; Or TAB
CAIA
JRST MVS.3 ;No - see if stored space
SKIPGE FSPACE ;Spaces allowed?
JRST MVS.5 ;No - terminate
MOVEI C,40
MOVEM C,FSPACE ;Convert to space
SOJN D,MVS.2 ;Count down
JRST MVS.5 ;Done when zero (COBOL only)
MVS.3:
SKIPG FSPACE ;Was a space stored?
JRST MVS.4 ;No
EXCH C,FSPACE ;Yes - get it
IDPB C,B ;Store it
MOVE C,FSPACE ;And restore other character
MVS.4:
CAIL C,140 ;If lowercase
SUBI C,40 ; Then convert
IDPB C,B ;Store the character
SETZM FSPACE ;Nothing stored now
SOJN D,MVS.2 ;Round again
MVS.5:
SETZ C,
IDPB C,B ;Terminate with <NULL>
CAME D,(P) ;Was whole string null?
AOS -1(P) ; No
ADJSP P,-1
RET
;
;DOLINE - Output the contents of the line buffer.
;
DOLINE:
MOVEI B,15 ;Skip two lines
IDPB B,HDRPTR
MOVEI B,12
IDPB B,HDRPTR
SETZ B,
IDPB B,HDRPTR ;Put in a null byte
MOVE A,[POINT 7,LINBUF]
PSOUT
RET
SUBTTL MEMORY MANAGEMENT
;
;LV1PAG - Get level-1 table page(s) for search or listing of subordinate
;level contents.
;
LV1PAG:
CALL UNMAP ;Release any pages mapped
HLRZ C,LVL1P ;Get the number of pages
ANDI C,777 ; in the next level-1 table
SKIPN C
MOVEI C,1 ;Default to 1
MOVEM C,PGSMPD
CAILE C,FILPGS ;Do we need more pages?
CALL FNDPAG ;Yes
HRRZ A,LVL1P ;Get the address of the level-1 table
LSH A,-^D9 ;And make it a page number
HRL A,FILJFN
MOVE B,FILPAG ;Point to memory
HRLI C,(PM%CNT!PM%RD)
PMAP
ERJMP [ADJSP P,-1
JRST MAPERR]
RET
;
;FNDPAG - Find a number of pages to use and return the first page number
;in FILPAG.
;
FNDPAG:
MOVE C,FILPAG ;Start here
HRLI C,.FHSLF ;Set the required flag
FPG.1:
MOVE A,C
RMAP ;Get the page status
ERJMP FPG.3
SKIPE B
AOJA C,FPG.1 ;Not available
MOVEM C,FILPAG ;Save this one - it may be OK
MOVE D,PGSMPD ;Get the count again (may have changed)
SOJ D,
AOJ C,
FPG.2:
MOVE A,C
RMAP ;Get status of next one
ERJMP FPG.3
SKIPE B
AOJA C,FPG.1 ;Not available - seach again
SOSLE D ;See if all found
AOJA C,FPG.2 ;Not yet - keep looking
HRRZ C,FILPAG ;Got all of them - make an address
LSH C,^D9
MOVEM C,FILADR
RET
FPG.3:
ADJSP P,-1
JRST MAPERR ;Cannot get memory
END