READFILE84
(George Source)
Macros used: ACROSS, ADDSKIP, BC, BFCBX, BS, BXE, BXGE, BXL, BXU, CHAIN, COOR3, FILEAUTW, FILENUMB, FILEREAD, FILETRAN, FON, FREECORE, GEOERR, JBC, JBS, JMBAC, JMBS, MBC, MHUNTW, NAME, PSTAC, READ, SEGENTRY, SETNCORE, SETREP, SFSTACK, SFUB, SKIPTRACE, STEP, STEPAGAIN, TESTLOOK, TESTSLOWEST, TESTUSEJ, TESTWAIT, TRACE, TRACEVER, UP, VARIADNR, VARIADNW, VFREE, VSKIP
- READFILE84.txt
22FL #SEG READFILE7 [JUDY BIDGOOD. 22^= #OPT K0READFILE=K0ACCESS>K0FILESTORE>K0ALLGEO 23DW #LIS K0READFILE 23YG #OPT K6READFILE=K6ACCESS>K6FILESTORE>K6ALLGEO 24D6 8HREADFILE 24XQ # 25CB SEGENTRY K1READFILE,NZREAD 25X2 SEGENTRY K2READFILE,STEP 26BL SEGENTRY K3READFILE,STEPAGAIN 26W= SEGENTRY K5READFILE,SHUFFLED 27*W SEGENTRY K7READFILE,WAITED 27TG ... SEGENTRY K9READFILE,VSKIP 28*6 SEGENTRY K21READFILE,ZREAD 28SQ SEGENTRY K22READFILE,ZSTEP 29#B SEGENTRY K23READFILE,ZSTEPAGAIN 29S2 # 2=?L # IMPLEMENTS MACROS WHOSE ENTRY POINTS ARE AS FOLLOWS :- 2=R= # K1 - 'READ' 2?=W # K21 - " (ZERO DEPTH) 2?QG # K2 - 'STEP' (GETTING A BLOCK FROM BACKING STORE 2#=6 # K22 - " (ZERO DEPTH 2#PQ # K3 - 'STEPAGAIN' 2*9B # K23 - " (ZERO DEPTH) 2*P2 # 2B8L # TO DEAL WITH COMMUNICATION AND D.C. FILES,SEGMENT COMMFILE IS 2BN= # ENTERED FROM READFILE.RE-ENTRY TO READFILE IS MADE AT ENTRY PTS 2C7W # K5 AND K7. 2CMG # 2D76 # THE SEGMENT IS IMPLEMENTED USING FILESTORE RINGS 2DLQ # 2F6B # ALL FILES OPEN HAVE AN FCB IN THE FILE CHAIN. NEXT TO THIS FCB 2FL2 # THERE IS A FILE/FSTACK BLOCK CONTAINING AN ENTRY FOR EACH ACTIVITY 2G5L # THAT HAS THE FILE OPEN. 2GK= # THIS ENTRY IS 'FELLEN'(CURRENTLY=7 WDS) LONG 2H4W # EACH ENTRY IN THE STACK IS RINGED TO THE ACTIVITY THAT IT REPRESE 2HJG # AND THE NTH ELEMENT ALONG THE RING REPRESENTS THE FILE OPEN AT 2J46 # DEPTH N 2JHQ # THE ENTRY LOOKS LIKE: 2K3B # WORD 1 FPTRF :FORWARD POINTER ALONG RING 2KH2 # WORD 2 BPTRF :BACKWARD POINTER ALONG RING 2L2L # WORD 3 FBACKPOINT :RELATIVE BACKWARD POINTER TO START OF FSTACK 2LG= # WORD 4 FREADBLOCK :POINTER TO NUMBER OF CURRENT BLOCK BEING READ 2L^W # WORD 5 FREADWORD : " " " " " RECORD " " 2MFG # WORD 6 FGENERAL1 :(OLD FCA5 WORD) ALLPURPOSE WORD,BITS SET HAVE 2M^6 # WORD 7 FGENERAL2 :SPECIAL MEANINGS FGENERAL2 IS FOR EXPANSION 2NDQ # 2NYB # USES OF AWORK WORDS 2PD2 # 2PXL # AWORK3 : INITIALLY ZERO 2QC= # USED AS SWITCH DURING CFS CODING 2QWW # 2RBG # AWORK4 : ZERO IF STEP ENTRY 2RW6 # CONTAINS 1 IF READ 2S*Q # CONTAINS 2 IF STEPAGAIN 2STB # 2T*2 # USES OF ACOMMUNE WORDS 2TSL # 2W#= # ACOMMUNE1 : CONTAINS FILE DEPTH FOR ENTRY TO COMMFILE 2WRW # ACOMMUNE2 : CONTAINS CMOD FOR ENTRY TO COMMFILE. 2X?G # ACOMMUNE3 : CONTAINS VALUE OF AWORK3 SWITCH FOR ENTRY TO COMMFILE 2XR6 # ACOMMUNE4 : CONTAINS FBLMOD FOR ENTRY TO COMMFILE. 2Y=Q # 2YQB # BITS IN THE FGENERAL WORDS MEAN AS FOLLOWS:- 2^=2 # A) FGENERAL1 2^PL # B0 : )READ MODE 329= # B1 : )READRANDOM MODE 32NW # B2 : )APPEND MODE 338G # B3 :FILE OPEN IN >WRITE MODE 33N6 # B4 : )GENERAL MODE 347Q # B5 : )COPY MODE 34MB # B6 : )CLEAN MODE 3572 # B7 :CURRENTLY UNUSED 35LL # B8 :FILE IS COMPONENT OF STREAM OR S.D.F.OTHER THAN MASTER ONE 366= # B9 :TWO REELS OPEN IN GENERAL MODE,LAST AND ANOTHER 36KW # B10:FILE HAS HAD RECORDS DELETED FROM IT (COMPRESS) 375G # B11:OPEN FOR COMMUNICATION 37K6 # B12:A RECORD HAS BEEN APPENDED. 384Q # B13:DIRECTORY 38JB # B14:OPEN IN USERCLEAN MODE(= COMMUNICATION FOR RANDOM FILES) 3942 # B15 TO 18:NOT SET WHEN FILE OPEN.CONCERNED WITH CLOSING FILE. 39HL # B19:SOMEONE SUSIN'ED FOR A RECORD TO BE APPENDED. 3=3= # B20:SOMEONE SUSIN'ED TO APPEND A RECORD. 3=GW # B21,B22:CURRENTLY UNUSED. 3?2G # B23:SPARE FCA. 3?G6 # B) FGENERAL2 3?^Q # B23:THIS ACTIVITY WAITING FOR THIS BLOCK 3#FB # B22:THIS ACTIVITY HAS GONE FOR THIS BLOCK 3#^2 # 3*DL # THE REST NOT ALLOCATED OR NOT IMMEDIATELY RELEVANT. 3*Y= # -------------------------------------------------------------------- 3BCW # 3BXG # 3CC6 MASK2 3CWQ MCOMUNI 3DBB #17770000 3DW2 ZGEOER1 3F*L GEOERR 1,READDEEP 3FT= ZGEOER2 3G#W GEOERR 1,REC BIT? [SOMETHING ODD ABOUT RECORD HEADER 3GSG ZGEOER3 3H#6 GEOERR 1,END FILE 3HRQ ZGEOER4 3J?B GEOERR 1,COMMREAD 3JR2 ZGEOER5 3K=L GEOERR 1,FREAD [SOMETHING ODD ABOUT READ POINTERS. 3KQ= ZGEOER10 3L9W GEOERR 1,CANTREAD 3LPG # 3M96 FILETRAN [SUBROUTINES FOR SPECIAL FILESTORE 3MNQ [B.S. TRANSFER ROUTINES 3N8B # SFUBREAD SUBROUTINE 3NN2 # 3P7L SFUBREAD 3PM= # LOOKS FOR A BLOCK,& READS IT DOWN IF NECESSARY 3Q6W # ON ENTRY X2=>FSTACK,X3=> F.C.A. 3QLG # ON EXIT X2->FSTACK,X3=> F.C.A. X1-> USAGE BLOCK 3R66 BFCBX 1,2 [X1 -> FCB 3RKQ SFUBREAD1 3S5B JBS WAITDCFX1,1,BFAPPCARE [J IF CAREFUL UPDATING BEING 3SK2 [DONE BY APPEND. 3T4L NOWAITDC 3TJ= SMO FREADBLOCK(3) 3W3W LDX 4 0(1) [X4 = BLOCK NUMBER 3WHG SKIPTRACE 299,4,SFUBREAD 3X36 SFUB 2,4,1,READFCB [J IF USAGE BLOCK NOT THERE 3XGQ EXIT 5 0 3Y2B # WE CAN'T GET THE LAST BLOCK IF CAREFUL UPDATING IS BEING DONE 3YG2 # BY APPEND AS FBLMOD IS INCORRECT & THE BLOCK USUALLY IS FULL OF 3Y^L # RUBBISH.THIS INTERLOCK SHOULD BY GOT ROUND EVENTUALLY. 3^F= WAITDCFX1 3^YW LDX 0 FBLMOD(1) [J IF NOT LAST BLOCK 42DG ADN 0 A1-1 42Y6 BXU 0 FREADBLOCK(3),NOWAITDC 43CQ SBX 5 FX1 [DECREMENT LINK 43XB WAITDC 44C2 BS 1,BFCAREW [SET 'WAITING FOR APPEND TO FINISH 44WL [CAREFUL UPDATING' BIT. 45B= COOR3 #113 [WAIT 45TW CALL 4 ZEXTRO 46*G CALL 4 POINTERS 46T6 ADX 5 FX1 [INCREMENT LINK 47#Q BRN SFUBREAD1 [TRY AGAIN. 47SB # 48#2 # READ SUBROUTINE 48RL # THIS READS THE NEXT BLOCK OF THE FILE DOWN 49?= # WAITING IF NECESSARY 49QW # 4==G # WAITING IS THE COMPLEX PART.WE MUST AVOID,AT ALL COSTS, 4=Q6 # READING THE SAME BLOCK DOWN TWICE,WHILE MAUING SURE THAT ANYONE 4?9Q # WANTING A BLOCK GETS IT. 4?PB # 4#92 # THERE ARE TWO MAIN CASES. 4#NL # (A) NOT LAST BLOCK' CASE 4*8= # WE TEST TO SEE IF ANY OTHER READER HAS GONE FOR THIS BLOCK. 4*MW # ' IF YES WE SET OURSELVES WAITING IN STYLE 7,SETTING A BIT IN 4B7G # FGENERAL2.EVENTUALLY,WHEN WE WAKE UP,THE BLOCK IS THERE. 4BM6 # 2 IF NO WE GO AND DO A BACKREAD(SETTING GONE FOR THIS BLOCK BIT) 4C6Q # 4CLB # (B) LLAST BLOCK' CASE 4D62 # 1 IF SOMEONE HAS GONE FOR LAST BLOCK,WE SET OURSELVES WAITING 4DKL # IN STYLE 4,SETTING THE WAITING FOR LAST BLOCK BIT IN THE FCB. 4F5= # 2 IF ANYONE HAS"GONE FOR THIS BLOCK",WE SET "WAITING FOR THIS 4FJW # BLOCK(FGEN.1) & WAIT IN STYLE 7 4G4G # 3 IF NOONE HAS GONE FOR THIS BLOCK,WE CHECK IF THE "GONE FOR NEW 4GJ6 # BLOCK"BIT IS SET.IF IT IS NOT WE SET GONE FOR LAST BLOCK BIT ,AND 4H3Q # WE ALSO SET GONE FOR THIS BLOCK BIT IN EITHER CASE 4HHB # THIS IS BECAUSE WE MAY GO TO READ DOWN A LAST BLOCK JUST AFTER 4J32 # SOMEONE ELSE HAS GONE TO GET A NEW BLOCK;LATER SOMEONE ELSE MIGHT 4JGL # COME FOR A BLOCK,AFTER THE NEW BLOCK HAS BEEN OBTAINED,AND READ 4K2= # THE SAME BLOCK DOWN,APPEND WILL NOT GET A NEW BLOCK IF ANYONE 4KFW # HAS GONE FOR LAST BLOCK. 4K^G READSTACK [ENTRY IF NO POINTERS AT ALL 4LF6 CALL 4 ZFSTACK 4LYQ READFCB [ENTRY IF HAVE POINTERS ONLY TO FSTACK & ELEMENT 4MDB BFCBX 1,2 [X1 IS POINTER TO FCB 4MY2 READ 4NCL SBX 5 FX1 [ADJUST LINK 4NX= LDX 0 FREADBLOCK(3) 4PBW SKIPTRACE 699,0,READFCB 4PWG BPZ 0 R1 [J IF FILE HAS BEEN READ FROM BEFORE 4QB6 LDN 0 FBLKS [O/W SET TO INITIAL VALUE 4QTQ STO 0 FREADBLOCK(3) 4R*B R1 4RT2 LDX 0 FBLMOD(1) [J IF 4S#L ADN 0 A1-1 [NOT LAST 4SS= BXU 0 FREADBLOCK(3),NOLBLOK [ BLOCK IN FILE 4T?W JBS WAITDC,1,BFAPPCARE [J IF CAREFUL UPDATE IN PROGRESS. 4TRG JBC SETGONR,1,BFLAST [J IF 'GONE FOR LAST BLOCK' BIT UNSET 4W?6 BS 1,BFLASTW [SET 'WAITING FOR LAST BLOCK' BIT. 4WQQ COOR3 #4 [WAIT 4X=B CALL 4 ZEXTRO [ELEMENT POINTER 4XQ2 CALL 4 POINTERS [FSTACK & FCB POINTERS 4Y9L BRN SFUBR 4YP= SETGONR ["GONE FOR LAST BLOCK"BIT NOT SET 4^8W CALL 4 TESTLOOK [ROUTINE TO TEST IF SOMEONE'S GONE 4^NG BRN SETWAITR [FOR THIS BLOCK.JTW"SETWAITR" IF 5286 [SOMEONE IS 52MQ BFCBX 1,2 [X1 -> FCB 537B JBS RBACKR,1,BFNEW [J IF 'GETTING NEW BLOCK' BIT SET. 53M2 BS 1,BFLAST [SET 'GONE FOR LAST BLOCK' BIT. 546L BRN RBACKR 54L= WAITR [SOMEONE(S)WAITING FOR THIS BLOCK 555W LDX 3 1 [PICK UP FSTACK PTR AGAIN 55KG FON 7 [FON ALL THE WAITERS 5656 CALL 4 POINTERS [FSTACK & FCB 56JQ BRN NOWO 574B SETWAITR 57J2 BS 3,BAFBLKW [SET 'WAITING FOR THIS BLOCK' BIT. 583L COOR3 #7 [WAIT FOR IT 58H= CALL 4 ZEXTRO [ELEMENT PTR 592W CALL 4 POINTERS [FSTACK & FCB PTR 59GG BC 3,BAFBLKW [UNSET BIT 5=26 SFUBR 5=FQ SMO FREADBLOCK(3) 5=^B LDX 4 0(1) 5?F2 SFUB 2,4,1,SBFCBX [J IF BLOCK NOT THERE TO SFCBX 5?YL BRN RLINKR 5#D= NOLBLOK 5#XW #SKI K6READFILE 5*CG BXL 0 FREADBLOCK(3),ZGEOER3 5*X6 CALL 4 TESTLOOK [HAS SOMEONE GONE FOR THIS BLOCK ? 5BBQ BRN SETWAITR [J IF YES 5BWB BFCBX 1,2 5CB2 RBACKR 5CTL BS 3,BAFBLK [SET 'GONE FOR THIS BLOCK' BIT. 5D*= LDX 2 1 5DSW ADX 2 FREADBLOCK(3) [GIVES PTR TO BLOCKNUMBER 5F#G SKIPTRACE 299,0(2),BACKREAD 5FS6 ADDSKIP I516A,ARDRD 5G?Q VARIADNR 1 5GHJ ...#SKI JSKI33-1 5GRB FILEREAD 7 5GYJ ...#SKI JSKI33 5H5Q ... FILEREAD 7,FAIL 5H?2 MHUNTW 1,BSTB,BREAD [FIND BUFFER BLOCK 5HQL CALL 4 ZFSTACK [STACK & ELEMENT 5J== LDX 4 BPTR(2) 5JPW SMO 4 [BS HOME MAY HAVE CHANGED,SO U DATE 5K9G LDX 0 BSPRE [USAGE BLOCK 5KP6 STO 0 BACK1(1) 5L8Q ADX 4 FREADBLOCK(3) [BLOCK NO. 5LNB SMO 4 5M82 LDX 0 0 5MML STO 0 BACK2(1) 5N7= NAME 1,FILE,FURB [RE-NAME BLOCK 5NLW CHAIN 1,2 [CHAIN USAGE BLOCK IN 5P6G CALL 4 POINTERS [STACK & FCB 5PL6 BC 3,BAFBLK [UNSET BIT. 5Q5Q LDX 0 FBLMOD(1) 5QKB ADN 0 A1-1 [IS IT LAST BLOCK 5R52 BXU 0 FREADBLOCK(3),NOLO [IF NOT,JUMP 5RJL JBC NOFON4,1,BFLASTW [J IF NOONE WAITING FOR LAST BLOCK. 5S4= FON #4 [WAKE UP ANYONE WAITING FOR LAST BLOK 5SHW CALL 4 POINTERS [X1-> FCB,X2-> FSTACK 5T3G NOFON4 5TH6 MBC 1,BFLAST,BFLASTW [CLEAR 'GONE FOR LAST BLOCK' AND 5W2Q ['WAITING FOR LAST BLOCK' BITS,IF SET 5WGB ['GONE FOR LAST BLOCK' BIT MAY NOT HA 5X22 [BEEN SET IF APPEND WAS GETTING A NEW 5XFL [BLOCK ETC - MAY NOT HAVE FINISHED YE 5X^= NOLO 5YDW LDX 1 3 [FOR TESTWAIT 5YYG TESTWAIT 1,WAITR,2 [J IF ANYONE WAITING FOR THIS BLOCK 5^D6 LDX 3 1 [PICK UP PTR TO ELEMENT 5^XQ NOWO 62CB LDX 1 FPTR(2) [X1 -> USAGE BLOCK 62X2 RLINKR 63BL ADX 5 FX1 [ADJUST LINK 63W= EXIT 5 0 64*W SBFCBX 64TG BFCBX 1,2 65*6 BRN R1 65SQ # 66#B # 66S2 ZDEEP 67?L # SPECIAL ROUTINE FOR CHECKING & CONVERTING DEPTH 67R= # 68=W LDX 7 ACOMMUNE7(2) [DEPTH 68QG SRA 7 15 69=6 #SKI K6READFILE 69PQ ( 6=9B FILENUMB 5 [X5 = NO OF FILES OPEN 6=P2 BPZ 7 P1 [J IF DEPTH NOT <0 6?8L ADX 5 7 6?N= BNG 5 ZGEOER1 6#7W BRN P2 6#MG P1 6*76 BXGE 7 5,ZGEOER1 6*LQ P2 6B6B ) 6BL2 EXIT 6 0 6C5L POINTERS 6CK= # THIS SUBROUTINE ,GIVEN POINTER TO A FILE ELEMENT IN X3 6D4W # SETS X2 -> FILE/FSTACK BLOCK & X1 -> FILE/FCB 6DJG PSTAC 2,3 [X2 -> FSTACK 6F46 BFCBX 1,2 [X1 -> FCB 6FHQ EXIT 4 0 6G3B # 6GH2 # 6H2L # 6HG= ZFSTACK 6H^W # DOES AN SFSTACK ON THE FILE OPEN AT DEPTH [X7] & ALSO GIVESA'POINT 6JFG # ER TO THE FSTACK BLOCK 6J^6 SFSTACK 7,3,2 6KDQ EXIT 4 0 6KYB # 6LD2 ZEXTRO 6LXL # THIS ENTRY DOES AN SFSTACK ON THE FILE OPEN AT DEPTH [7] 6MC= # & LEAVES THE POINTER IN X3 6MWW SFSTACK 7,3 6NBG EXIT 4 0 6NW6 # 6P*Q # 6PTB # SFUBFREE SUBROUTINE 6Q*2 # 6QSL SFUBFREE 6R#= # THIS SUBROUTINE LOOKS FOR A BLOCK & EXITS IF ITS NOT THERE 6RRW # IF IT IS PRESENT,IT ENTERS THE VFREE SUBROUTINE 6S?G # X1 MUST POINT TO FCB 6SR6 SMO FREADBLOCK(3) 6T=Q LDX 4 0(1) [X4 = BLOCK NUMBER 6TQB SKIPTRACE 699,4,SFUBFREE 6W=2 SFUB 2,4,6,VEXITS [J TO EXIT IF NOT THERE 6WPL # THS BLOCK IS NOT FREED IF THERE IS AN APPENDER & IT'S THE LAST 6X9= # BLOCK. 6XNW BFCBX 1,2 [X1 -> FCB 6Y8G VFREE1 6YN6 JBS VEXITR,1,BFCORE [J IF 'LEAVE BLOCKS IN CORE' BIT SET. 6^7Q LDX 0 FREADBLOCK(3) 6^MB SBX 0 FBLMOD(1) [TEST IF LAST BLOCK 7272 SBN 0 A1-1 [WON'T FREE LAST BLOCK IF SO 72LL BNZ 0 VQRST [J IF NOT LAST BLOCK 736= JMBS (5),3,BAMAPP,BAMGEN [DON'T FREE BLOCK IF CURRENT ACTIVITY 73KW [HAS FILE OPEN IN APPEND OR GENERAL M 745G LDX 0 CTOPEN(1) [COUNT OF PEOPLE HAVING FILEOPEN 74K6 SMO FX1 754Q ANDX 0 MASK2 [= #17770000,MASKS OFF CT. OF APPENDERS 75JB BNZ 0 (5) [J IF LAST BL.& 1 APPENDER. 7642 VQRST 76HL # 773= # FREES USAGE BLOCK 77GW # UNLESS SOMEONE IS USING IT,IN WHICH CASE IT'S LEFT 782G # IF IT'S A FUWB,IS'S WRITTEN BACK 78G6 # X6-> USAGE BLOCK (!),CALLED BY X5 78^Q # 79FB VFREE 79^2 LDX 1 3 [PRESERVE FROM TSESTUSEJ MACRO 7=DL TESTUSEJ 1,VUSIN,2 [JIF ANYONE USING BLOCB 7=Y= LDX 3 1 7?CW SKIPTRACE 699,FREADBLOCK(3),FREEING 7?XG SMO 6 7#C6 LDX 0 ATYPE [ATYPE OF USAGE BLOCK 7#WQ BXE 0 FFSFURB,VREE [J IF NOT WRITE BLOCK 7*BB #SKI I516A 7*W2 ( 7B*L BFCBX 2,2 7BT= VARIADNW 2 7C#W ) 7CSG CHAIN 6,FX2 7D#6 SBX 5 FX1 [CALLING ACCUMULATOR 7DRQ ADDSKIP I516A,ARDWR 7F?B FILEAUTW 7,FAIL+FREE 7FR2 CALL 4 ZEXTRO [ELEMENT 7G=L ADX 5 FX1 7GQ= BRN VEXITQ 7H9W VREE 7HPG ADDSKIP I516A,ARDFR 7J96 FREECORE 6 7JNQ VEXITQ 7K8B CALL 4 POINTERS [FSTACK & FCB 7KN2 EXIT 5 0 7L7L VUSIN 7LM= LDX 3 1 7M6W PSTAC 2,3 [RESET X2 7MLG VEXITS 7N66 BFCBX 1,2 [KEEP EXIT CONDITION CONSISTENT 7NKQ VEXITR 7P5B EXIT 5 0 7PK2 # 7Q4L # THIS ROUTINE EXITS +1 IF NOONE HAS GONE FOR CURRENT BLOCK 7QJ= # NORMALLY IF SOMEONE HAS 7R3W # X0,X1 OVERWRITTEN,X2 ON NORMAL EXIT 7RHG TESTLOOK 7S36 LDX 1 3 7SGQ TESTLOOK 1,TESTA1,2 7T2B LDX 3 1 7TG2 EXIT 4 1 7T^L TESTA1 7WF= LDX 3 1 7WYW PSTAC 2,3 [RESET X2 7XDG EXIT 4 0 7XY6 # 7YCQ # 7YXB # -------------------------------------------------------------------- 7^C2 # READ, STEP (READING A BLOCK DOWN) 7^WL # 82B= # THE DEPTH IS CHECKED,AND THE FSTACK BLOCK IS SEARCHED FOR 82TW # THE USAGE BLOCK NUMBER IS FOUND, THE BLOCK LOOKED FOR. 83*G # (A) IF FOUND: 83T6 # IF'CURRENT'RECORD ON ENTRY WAS LAST IN BLOCK,PICK UP NEXT NUMBER 84#Q # (UNLESS 'CURRENT' BLOCK ON ENTRY WAS LAST, WHEN GO TO SPECIAL 84SB # EXIT) AND LOOK FOR THAT BLOCK. HAVING CHECKED THIS, SET UP FRB 85#2 # IF IN READ,LOOK AGAIN FOR USAGE (GO TO (B) IF LOST MEANWHILE ) 85RL # AND MOVE IN RECORD.EXIT. 86?= # (B) READ BLOCK DOWN,FIND POINTERS AGAIN AND GO TO (A) 86QW # 86TF ...[ 86Y4 ...VSKIP [VSKIP - ANY DEPTH 872M ...[ 875= ... LDN 4 3 877T ... BRN SAGSTEP1 87=G [ 87Q6 NZREAD [READ - N/Z DEPTH ENTRY. 889Q [ 88PB ADDSKIP I516A,IREAD 8992 LDN 4 1 [MARKER 89NL BRN RSTOLP 8=8= [ 8=MW STEPAGAIN [STEPAGAIN - N/Z DEPTH ENTRY 8?7G [ 8?M6 LDN 4 2 8#6Q BRN SAGSTEP1 8#LB [ 8*62 STEP [STEP - N/Z DEPTH ENTRY. 8*KL [ 8B5= LDN 4 0 8BJW SAGSTEP1 8C4G ADDSKIP I516A,K2RD 8CJ6 STO 3 ACOMMUNE7(2) 8D3Q RSTOLP 8F32 STOZ AWORK3(2) [SHOWS WE HAVE'NOT YET COORED'-SEE 8FGL [E.O.F. COMMUNICATION CODING 8G2= STO 4 AWORK4(2) [MARKER 8GFW CALL 6 ZDEEP [CONVERT AND CHECK DEPTH 8G^G BRN READW 8HF6 [ 8HYQ ZREAD [READ - ZERO DEPTH ENTRY. 8JDB [ 8JY2 ADDSKIP I516A,IREAD 8KCL LDN 4 1 8KX= BRN SSTOLP 8LBW [ 8LWG ZSTEPAGAIN [STEPAGAIN - ZERO DEPTH ENTRY. 8MB6 [ 8MTQ LDN 4 2 8N*B BRN SAGSTEP2 8NT2 [ 8P#L ZSTEP [STEP - ZERO DEPTH ENTRY 8PS= [ 8Q?W LDN 4 0 8QRG SAGSTEP2 8R?6 ADDSKIP I516A,K2RD 8RQQ SSTOLP 8SQ2 STOZ AWORK3(2) 8T9L STO 4 AWORK4(2) [MARKER 8TP= STOZ 7 [FOR READ/STEP,X7=DEPTH THROUGHOUT 8W8W BRN READW 8WNG [ 8X86 SHUFFLED [RE-ENTRY FROM COMMFILE. BLK NOS IN 8XMQ [ 8Y7B [FCB RESHUFFLED FOR D.C. FILES. 8YM2 READW 8^6L CALL 4 ZEXTRO [GET POINTER TO ELEMENT IN X3 8^L= CALL 4 POINTERS [X2 -> FSTACK,X1 FCB 925W #SKI K6READFILE 92KG ( 9356 JMBAC ZGEOER10,3,BAMREAD,BAMAPP,BAMGEN,BAMCLEAN [CHECK FILE OP 93JQ ) 944B READX 94J2 LDX 0 FBLMOD(1) [POINTER TO END OF BLOCKLIST IN FCB 953L SBN 0 AF2-A1 95H= BZE 0 READA1 [J IF EMPTY FILE 962W LDX 0 FREADBLOCK(3) [CURRENT BLOCK POINTER 96GG BPZ 0 SFUB [GO LOOK FOR USAGE BLOCK IF WE'VE 9726 [READ FROM FILE BEFORE. 97FQ LDN 0 FBLKS [ 97^B STO 0 FREADBLOCK(3) [FREADBLOCK POINTS TO 1ST BLOCK 98F2 BRN NORENDIS 98YL [ 99D= WAITED [RE-ENTRY FROM COMMFILE AFTER HAVING 99XW [ 9=CG LDX 0 ACOMMUNE3(2) [WAITED FOR RECORD TO BE APPENDED 9=X6 STO 0 AWORK3(2) 9?BQ CALL 4 ZEXTRO [RESET X3,X2,X1 9?WB CALL 4 POINTERS 9#B2 LDX 0 FREADBLOCK(3) 9#TL SFUB 9**= SBX 0 FBLMOD(1) [ IF[F'BLOCK]=[FBLMOD]+A1, WE EITHER 9*SW SBN 0 A1 [ ARE ABOUT TO READ E.O.F [F'WORD <0] 9B#G BNG 0 NORENDIS [ OR HAVE READ E.O.F [F'WORD =A1] 9BS6 #SKI K6READFILE 9C?Q ( 9CRB LDX 0 FREADWORD(3) 9D?2 BPZ 0 ZGEOER3 9DQL ) 9F== NGN 6 1 [SWITCH 9FPW BRN READA 9G9G NORENDIS 9GP6 CALL 5 SFUBREAD1 [SET X1->USAGE BLOCK 9H8Q LDX 0 FREADWORD(3) [LOOK AT RECORD POINTER IN THIS BLOCK 9HNB BXE 0 BSBSA1,STEPREP [J IF SPECIAL SETTING FOR STEPAGAIN 9J82 LDX 6 1 [PRESERVE USAGE BLOCK POINTER 9JML BNG 0 SETA1 [J IF FIRST READ ON THIS BLOCK 9K7= ADX 1 0 [X1+A1 -> RECORD HEADER 9KLW YDUM10 9L6G LDX 0 FRH(1) [NEXT R.H 9LL6 BPZ 0 NDUM10 [J IF NOT DUMMY 9M5Q ANDX 0 BRHMASK 9MKB BNZ 0 ZGEOER2 [OR XRUPT IF FDUD. 9N52 LDEX 0 FRH(1) [BOTTOM 9 BITS 9NJL #SKI K6READFILE 9P4= BZE 0 ZGEOER2 9PHW ADX 1 0 [STEP ON PTR 9Q3G ADS 0 FREADWORD(3) [& FREADWORD 9QH6 BRN YDUM10 9R2Q NDUM10 9RGB BZE 0 ZAPPRECQ [J IF ZERO RECORD AT END OF BLOCK 9S22 [LAST READ 9SFL ADX 1 0 [UPDATE PTR TO POINT TO NEXT RECORD 9S^= BRN QOLPOD 9TDW # WE NOW TEST IF LAST BLOCK, FOR IF SO, WE 9TYG # DON'T WANT TO THROW AWAY THE BLOCK EVERY TIME WE DO A READ IN THE 9WD6 # CLASSIC COMMUNICATION FILES CASE OF 'READ(ACT.1)-APPEND(ACT2)- 9WXQ # READ(ACT.1)-APPEND(ACT2).THAT WOULD BE TOO INEFFICIENT EVEN FOR G3 9XCB ZAPPRECQ 9XX2 BFCBX 1,2 9YBL #SKI K6READFILE 9YW= ( 9^*W LDX 0 FBLMOD(1) 9^TG ADN 0 A1-1 =2*6 SBX 0 FREADBLOCK(3) =2SQ BNZ 0 NLASTBLK [J IF NOT LAST BLOCK =3#B SMO FX2 =3S2 LDX 0 AWORK4 =4?L SBN 0 1 =4R= BNZ 0 STEPREP [J IF STEP OR STEPAGAIN =5=W BRN ZGEOER3 [ERROR IF LAST BLOCK =5QG NLASTBLK =6=6 JBS ZGEOER4,1,BFDCF [READ E.O.F. THEREFORE ERROR IF DCF. =6PQ ) =79B CALL 5 VFREE1 =7P2 LDN 0 A1 [O/W ASSUME RECORDS HAVE =88L STO 0 FREADWORD(3) [BEEN APPENDED IN A NEW BLOCK =8N= LDX 0 FREADBLOCK(3) [SINCE LAST READING =97W ADN 0 1 [E.O.F. & SET POINTERS =9MG STO 0 FREADBLOCK(3) [AS IF WE'VE READ. ==76 BRN SFUB [THE FIRST OF THES5& NEW RECORES ==LQ VRECLAST =?6B BFCBX 1,2 [X1 - > FCB. =?L2 LDX 0 FBLMOD(1) [END OF BLOCK NUMBERS TABLE =#5L SBX 0 FREADBLOCK(3) [IS IT =#K= ADN 0 A1-1 [LAST BLOCK ? =*4W BZE 0 READA [J TO EOF ROUTINE =*JG ZEND =B46 JBS RESHUFL,1,BFDCF [J TO RESHUFFLE BLK NOS. IF DCF. =BHQ JBC XFREE,1,BFGDR [J IF NOT GENERAL DESTRUCTIVE READ AC =C3B LDX 1 3 [X1->FCA =CH2 TESTSLOWEST 1,SLOWGDR,2 [J IF SLOWEST GDR READER. =D2L LDX 3 1 =DG= CALL 4 POINTERS =D^W XFREE =FFG CALL 5 VFREE1 [DEAL WITH SPENT BLOCK =F^6 LDN 0 1 =GDQ ADS 0 FREADBLOCK(3) [O/W,ADD ONE TO BLOCK POINTER =GYB NGS 0 FREADWORD(3) [SET RECORD POINTER NEGATIVE =HD2 LDX 0 FREADBLOCK(3) =HXL BRN SFUB [GO LOOK FOR NEXTBLOCK =JC= SLOWGDR =JWW #SKI K6READFILE>159-159 =KBG TRACE FREADBLOCK(1),GDRSHUFL =KW6 FREECORE 6 [FREE USAGE BLOCK =L*Q BRN XGDRSHUFL =LTB RESHUFL =M*2 #SKI K6READFILE>159-159 =MSL TRACEVER FBLMOD(1),RESHUFLE =N#= LDX 2 6 [RENAME OLD BLOCK A FURB =NRW NAME 2,FILE,FURB [AND EMPTY IT =P?G STOZ A1(2) =PR6 XGDRSHUFL =Q=Q LDX 2 FX2 =QQB STO 7 ACOMMUNE1(2) [STORE FILE DEPTH =R=2 ACROSS COMMFILE,1 [RESHUFFLE BLK NOS =RPL SETA1 =S9= ADN 1 A1 [PTR TO 1ST REC. =SNW QOLPOD =T8G YDUM11 =TN6 LDX 0 FRH(1) [NEXT R.H =W7Q BPZ 0 NDUM11 [J IF NOT DUMMY =WMB ANDX 0 BRHMASK =X72 BNZ 0 ZGEOER2 [OR XRUPT IF FDUD =XLL LDEX 0 FRH(1) [BOTTOM 9 BITS =Y6= #SKI K6READFILE =YKW BZE 0 ZGEOER2 =^5G ADX 1 0 [STEP ON PTR =^K6 BRN YDUM11 ?24Q NDUM11 ?2JB SMO FX2 ?342 LDX 4 AWORK4 ?3HL SBN 4 2 ?43= BZE 4 STEPREP [J IF STEPAGAIN ?4GW BZE 0 VRECLAST [J IF RECORD LAST IN BLOCK. ?52G SBX 1 6 ?5G6 BXGE 1 BSBSA1,ZGEOER2 [J IF GREATER THAN ONE BLOCK SIZE. ?5^Q ADN 4 1 [TO XRUPT IF FDUD ?6FB BNZ 4 STEPREP [J IF STEP ?6^2 STO 1 FREADWORD(3) [UPDATE F'WORD ?7DL ADX 1 6 ?7Y= SKIPTRACE 199,6,READ BL ?8CW LDX 6 0 [SIZE OF BLOCK WANTED ?8XG SETUPCOR 6,1,FILE,FRB [SET UP READ BLOCK ?9C6 CALL 4 ZFSTACK [POINTERS ?9WQ CALL 5 SFUBREAD [X1 -> USAGE BLOCK ?=BB MHUNTW 2,FILE,FRB ?=W2 ADX 1 FREADWORD(3) [PTR TO RECORD ??*L ADN 2 A1 ??T= SMO FRH(1) [MOVE IN ?##W MOVE 1 0 [RECORD ?#SG SETREP ?*#6 SETREP OK [REPLY FOR READ ?*RQ UP ?B?B UP ?BR2 STEPREP ?C=L SETREP COORED [REPLY FOR STEP ?CQ= UP ?D9W # LAST BLOCK ?J6W READA1 ?JLG STOZ 6 ?K66 READA ?KKQ SMO FX2 ?L5B LDX 0 AWORK4 ?LK2 SBN 0 2 ?M4L ... BPZ 0 STEPREP [J IF STEPAGAIN ?MJ= JBC NOAPPE,3,BACOMM [J IF NOT OPEN IN COMMUNE MODE. ?N3W JBS MORAPPE,1,BFDCF [IF A D.C. FILE WE WISH TO GO WAITING ?NHG [ANYWAY - IF NECESSARY FOR EVER - SO ?P36 [ANOTHER APPENDER CAN OPEN THE FILE. ?PGQ LDX 0 CTOPEN(1) ?Q2B SMO FX1 [MASK OUT ALL EXCEPT COUNT OF ?QG2 ANDX 0 MCOMUNI [APPENDERS ?Q^L BZE 0 NOAPPE [J IF NO APPENDERS ?RF= SRL 0 2 ?RYW SBN 0 #4000 [NEG IF ONLY ONE ?SDG BPZ 0 MORAPPE [J IF >1 APPENDER ?SY6 JBC MORAPPE,3,BAMAPP [SEE IF WE'RE THE ONE(SOLE) APPENDER ?TCQ [AND J IF WE'RE NOT. ?TXB NOAPPE ?WC2 SMO FX2 ?WWL LDX 0 AWORK4 [MARKER WORD ?XB= BZE 0 STEPREP [J IF STEP ?XTW BNG 0 UP ?Y*G BNG 6 OFRI [SPECIAL ENTRIES ?YT6 BZE 6 NOFR1 ?^#Q CALL 5 VFREE ?^SB NOFR1 #2#2 LDX 0 FBLMOD(1) #2RL ADN 0 A1 [EOF SETTING ,F'WORD = FBLKOD+A1 #3?= STO 0 FREADBLOCK(3) [F'WORD =A1 #3QW LDN 0 A1 #4=G STO 0 FREADWORD(3) #4Q6 SETNCORE 1,1,FILE,FRB [SET UP ZERO FRB #59Q STOZ A1(1) [STOZ 1ST WORD #5PB BRN SETREP #692 OFRI #6NL CALL 5 SFUBFREE [TRY TO FREE BLOCK #78= BRN NOFR1 #7MW MORAPPE #87G # ENTRY IS NOW MADE TO COMMFILE TO DEAL WITH COMPLEX COMMUNICATION #8M6 # FILE INTERLOCKS AT E.O.F. ONLY 'STEP' ENTRIES ALLOWED HERE. #96Q LDX 2 FX2 #9LB #SKI K6READFILE #=62 ( #=KL LDX 0 AWORK4(2) #?5= BZE 0 T46 #?JW BPZ 0 ZGEOER4 ##4G T46 ##J6 ) #*3Q STO 7 ACOMMUNE1(2) [DEPTH #*HB LDX 0 AWORK3(2) #B32 STO 0 ACOMMUNE3(2) #BGL LDX 0 CMOD(1) [CURRENT POSN. OF APPEND POINTERS. #C2= STO 0 ACOMMUNE2(2) #CFW LDX 0 FBLMOD(1) #C^G STO 0 ACOMMUNE4(2) #DF6 ACROSS COMMFILE,2 [WAIT FOR RECORD TO BE APPENDED. #DYQ # #FDB ...#END ^^^^ ...11250114000300000000