The C Users' Group Library 1994 August

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Text File | 1979-12-31 | 5KB | 358 lines

LIB CCEQU.SYS NAME CRTL * * 16 bit division * GLOBAL ccdiv,ccmult GLOBAL fopen,fclose,getc,putc,putchar,getchar,rewind,gets GLOBAL exit GLOBAL CCSWITCH * * D=X/D * ccdiv CLR ADR31 STX ADR1 STD ADR2 CMPD #0 BNE ccd1 LDA #103 LBRA exi1 ccd1 BGT ccd2 COM ADR31 COMA COMB ADDD #1 STD ADR2 ccd2 LDD ADR1 CMPD #0 BGT ccd3 COM ADR31 COMA COMB ADDD #1 STD ADR1 ccd3 LDA #16 STA ADR3 CLRA CLRB DIVD ASL ADR1+1 ROL ADR1 ROLB ROLA CMPD ADR2 BLO NOSUB SUBD ADR2 INC ADR1+1 NOSUB DEC ADR3 BNE DIVD TFR D,X LDD ADR1 TST ADR31 BEQ ccd4 COMA COMB ADDD #1 ccd4 RTS * * 16 bit multiplication * ccmult STX ADR1 STD ADR2 CLR ADR3 CLR ADR3+1 LDA ADR1+1 LDB ADR2+1 MUL STD ADR3+2 LDA ADR1 LDB ADR2+1 MUL ADDD ADR3+1 STD ADR3+1 LDA ADR1+1 LDB ADR2 MUL ADDD ADR3+1 STD ADR3+1 BCC NOCARRY INC ADR3 NOCARRY LDA ADR1 LDB ADR2 MUL ADDD ADR3 TFR D,X LDD ADR3+2 RTS ADR1 RMB 2 ADR2 RMB 2 ADR3 RMB 1 ADR31 RMB 3 * * file open routine * fopen * * I/O routines * * select FCB * LDA #NOFILE get number of allowed files LDB FCBPTR get file id pointer fop1 RORB search for free slot BCC fop3 found DECA try next LBEQ foperr no free found BRA fop1 else try again fop3 LDX #FCB-FCBSIZ found, get FCB adr DECA CLRB ORCC #1 set carry flag fop2 LEAX FCBSIZ,X get next FCB INCA ROLB CMPA #NOFILE found? BNE fop2 no, try next one STB ADR1 save flag LDY 4,S get adr of filename STY LBPTR store in line buffer ptr CLRA replace \0 with CR FENDSTR CMPA ,Y+ BNE FENDSTR LDA #13 STA ,-Y JSR GETFIL check file name and set in FCB BCS foperr fdefex LDA #1 set default extension to .TXT JSR SETEXT fopen9 LDY 2,S get mode LDA ,Y+ get first char of mode ORA #$20 force lower case STY ADR2 save adr LDY #FMODE search for right mode fopen2 CMPA ,Y+ BEQ fopen3 found LDB ,Y+ BNE fopen2 BRA foperr fopen3 LDA ,Y STA ,X TFR A,B JSR FMS open file BEQ fopok go if ok CMPB #2 else if it exist already (write) BNE foperr LDA #12 delete file STA ,X JSR FMS BNE foperr on error return 0 * * now recover file name * LDY 4,S STY LBPTR JSR GETFIL LDA #2 and try again STA ,X JSR FMS BNE foperr branch on error fopok LDB ADR2 get next char CMPB #'b binary file access? BNE FRTS yes LDA #$FF indicate binary STA 59,X FRTS LDA ADR1 recall flag ORA FCBPTR set fcb in use STA FCBPTR TFR X,D give FCB address to program RTS else return foperr LDD #0 RTS NOFILE EQU 4 number of files allowed FMODE EQU * file access mode FCB 'r FREAD FCB 1 FCB 'w FWRITE FCB 2 FCB 'u FUPDATE FCB 3 FCB 'b FBIN FCB 4 FDB 0 FCBPTR FCB 0 pointer to FCB FCBSIZ EQU 320 size of FCB FCB RMB FCBSIZ*NOFILE * * check if valid FCB * X=FCB , returns -1 in D if false * CHKFCB CMPX #FCB BEQ CHKRET CMPX #FCB+FCBSIZ BEQ CHKRET CMPX #FCB+FCBSIZ+FCBSIZ BEQ CHKRET CMPX #FCB+FCBSIZ+FCBSIZ+FCBSIZ BEQ CHKRET LDD #-1 CHKRET RTS * * read character from file * getc LDX 2,S get FCB adr CMPX #3 LBLO getchar yes, standart device BSR CHKFCB check if FCB is ok LBMI foperr something was wrong CLR ,X in FCB JSR FMS BNE getc1 TFR A,B SEX RTS getc1 LDA 1,X get error code CMPA #8 end of file ? LBNE foperr no, error LDD #-1 else return EOF RTS * * put character to file * putc LDX 2,S get FCB adr CMPX #2 BHI putc1 LDA 5,S BRA putcha1 putc1 BSR CHKFCB LBMI foperr CLR ,X LDA 5,S JSR FMS LBNE foperr LDD #1 RTS * * close file * fclose LDX 2,S BSR CHKFCB LBMI foperr LDA #4 STA ,X JSR FMS LBNE foperr * * reset FCB pointer * LDB #1 PSHS B TFR X,D SUBD #FCB BEQ RESPTR L1 STD ADR1 PULS B LSLB PSHS B LDD ADR1 SUBD #FCBSIZ BEQ RESPTR BRA L1 RESPTR PULS B EORB FCBPTR STB FCBPTR RTS * * rewind file * rewind LDX 2,S LBSR CHKFCB LBMI foperr LDA #5 STA ,X JSR FMS LBNE foperr RTS * * exit program, calls FLEX warm start entry * and reports error * exit LDD 2,S exi1 LDX #FCB STA 1,X JSR REPERR JMP WARMS RTS * * report error * reperr LDX 2,S get FCB adr JMP REPERR * * get character from keyboard * getchar JSR GETCHR TFR A,B SEX RTS * * write character to terminal * putchar LDA 3,S get character putcha1 JSR PUTCHR CMPA #13 BNE P1 LDA #10 JMP PUTCHR P1 RTS * * get line from keyboard * gets LDX 2,S get adr of line gets1 BSR getchar get character in B CMPB #8 delete ? BNE gets2 LDA #$20 JSR PUTCHR LDA #8 JSR PUTCHR LDA ,-X BRA gets1 gets2 STB ,X+ CMPB #13 end of input? BNE gets1 no CLRA STA ,-X RTS * * switch statement * * D = switch value * S = switch table * FDB addr1, value1 * FDB addr2, value2 * ... * FDB 0 * [JMP DEFAULT] * continuation * CCSWITCH PULS X get stack adr SWLOOP LDY ,X++ get address CMPY #0 if 0 BEQ SWEND then it is the default CMPD ,X++ else, if it is not the switch value BNE SWLOOP try next one JMP ,Y else we found it SWEND JMP ,X default exit END