391 lines
9.2 KiB
NASM
391 lines
9.2 KiB
NASM
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;
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; Copyright (c) Mix Software 1988
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;
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; fwrite(buffer,itemsize,no_of_items,fp)
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; char *buffer;
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; int itemsize;
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; int no_of_items;
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; FILE *fp;
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; { return (_write(fp,buffer,itemsize*no_of_items) / itemsize); }
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;
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IDT fwrite
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DEF fwrite
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FREF _write
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fwrite MOV BX,SP
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MOV AX,[BX][%PARM2-2] ; # of items
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MOV CX,[BX][%PARM3-2] ; item count
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CMP AX,1
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JZ FWRITE1SZ ; avoid multiply by 1
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CMP CX,%1
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JZ FWRITE1I ; avoid multiply by 1
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MUL CX
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PUSH AX ; pass count to _write
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PUSH [BX][%PARM1-2] ; pass file pointer
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PUSH [BX][%PARM4-2] ; pass address
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CALLFAR _write
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ADD SP,%6
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CMP AX,-1
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JZ ERROR
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MOV BX,SP
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MOV CX,[BX][%PARM2-2] ; item size
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CWD
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DIV CX ; convert byte count to item count
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RETSEG
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ERROR XOR AX,AX
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RETSEG
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;
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; Item size is 1
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;
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FWRITE1SZ PUSH CX
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PUSH [BX][%PARM1-2]
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PUSH [BX][%PARM4-2]
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CALLFAR _write
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ADD SP,%6
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CMP AX,-1
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JZ ERROR
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RETSEG
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;
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; Number of items is 1
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;
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FWRITE1I PUSH AX
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PUSH [BX][%PARM1-2]
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PUSH [BX][%PARM4-2]
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CALLFAR _write
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ADD SP,%6
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CMP AX,-1
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JZ ERROR
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MOV BX,SP
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CMP AX,[BX][%PARM2-2] ; is size == 1?
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JZ ONE ; skip divide by 1
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MOV CX,[BX][%PARM2-2]
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CWD
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DIV CX
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RETSEG
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ONE MOV AX,1
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RETSEG
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END
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;
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; ------------------------------------------------------------
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;
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; _write(fp, bufptr, n)
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; int n;
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; FILE *fp;
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; char *bufptr;
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;
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IDT _write
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DEF _write
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FREF _fflush
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FREF _rflush
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FREF _putc
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FREF _seekend
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REF _fileerr
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_write PUSH BP
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MOV BP,SP
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MOV BX,[BP][%PARM1]
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TEST BX,BX
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JZ FILEERR
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;
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; if (fp == NULL || !fp->file.init || !fp->file.openflg) return 0;
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;
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; TEST BX,BX ; File ok?
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; JZ ENDFL
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; CMP %[BX][%FD$INIT],%0
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; JZ ENDFL
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; CMP %[BX][%FD$OPEN],%0
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; JZ ENDFL
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;
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; if (fp->file.dirty & fdread) {
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; if (_rflush(fp) != 0) return EOF;
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; }
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;
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TEST %[BX][%FD$DIRTY],%FL$READ
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JNZ FLUSH ; file has been read, flush buffer
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;
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; if (fp->file.flags & fdfilter) {
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;
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NOFLUSH MOV AL,[BX][%FD$FLAGS]
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TEST AL,%FL$UNBUF ; unbuffered file?
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JNZ UNBUFR
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TEST AL,%FL$LFEED ; text mode?
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JZ NOCR
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;
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; Write and insert carriage return before linefeed
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;
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; while (n-- != 0) {
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; if ((c = *bufptr++) == NEWLINE) {
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; if (_putc(RETURN,fp) != RETURN) return EOF;
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; }
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; if (_putc(c,fp) != c) return EOF;
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; }
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;
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; bx = file
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; di = file buffer
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; si = buffer address
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; dx = count remaining
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; cx = buffer count
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;
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MOV SI,[BP][%PARM2]
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MOV DX,[BP][%PARM3] ; Requested count
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TEST DX,DX
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JZ DONE1
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MOV DI,[BX][%FD$PTR]
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MOV CX,[BX][%FD$COUNT]
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JCXZ MORE1
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MOV AX,DS
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MOV ES,AX
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COPY1 LODSB ; Get a byte
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NEXTCH1 CMP AL,>0A
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JZ ADDCR
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COPY1A STOSB ; Store in file buffer
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DEC DX ; count character
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JZ DONE1A ; read complete
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LOOP COPY1
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MORE1 CALL PUTBLK
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JB FILEERR
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MOV AX,DS
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MOV ES,AX
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JMPS COPY1
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ADDCR MOV AL,>0D
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STOSB
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MOV AL,>0A
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LOOP COPY1A
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CALL PUTBLK
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JB FILEERR
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MOV AX,DS
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MOV ES,AX
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MOV AL,>0A
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JMPS COPY1A
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DONE1A DEC CX
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DONE1B MOV [BX][%FD$COUNT],CX
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MOV [BX][%FD$PTR],DI
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CMP DI,[BX][%FD$BUFR]
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JZ DONE1
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MOV %[BX][%FD$DIRTY],%FL$WRITE
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DONE1 MOV AX,[BP][%PARM3]
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SUB AX,DX
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POP BP
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RETSEG
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NOCR JMP NOCR1
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;
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FILEERR2 POP CX
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POP SI
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FILEERR MOV AX,-1
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POP BP
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RETSEG
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;
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FLUSH PUSH BX
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CALLFAR _rflush
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POP BX
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TEST AX,AX
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JZ NOFLUSH
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JMPS FILEERR
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;
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; File is not buffered
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;
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UNBUFR TEST AL,%FL$BIN
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JZ UNBUFR0
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JMP DIRECT
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UNBUFR0 MOV CX,[BP][%PARM3]
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JCXZ UBDONE
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MOV SI,[BP][%PARM2]
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UNBLOOP LODSB
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CMP AL,>0A
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JZ UBCR
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XOR AH,AH
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UBPUT PUSH SI
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PUSH CX
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UBPUT2 PUSH BX
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PUSH AX
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CALLFAR _putc
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POP DX
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POP BX
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POP CX
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POP SI
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CMP AX,-1
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JZ FILEERR
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LOOP UNBLOOP
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UBDONE MOV AX,[BP][%PARM3]
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POP BP
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RETSEG
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;
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UBCR TEST %[BX][FD$FLAGS],%FL$LFEED
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JZ UBPUT
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PUSH SI
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PUSH CX
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PUSH BX
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MOV AX,>000D
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PUSH AX
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CALLFAR _putc
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POP DX
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POP BX
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CMP AX,-1
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JZ FILEERR2
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MOV AX,>000A
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JMPS UBPUT2
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DIRECT1 JMP DIRECT
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;
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; File is binary and buffered
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;
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NOCR1 MOV AX,[BP][%PARM3] ; Length of write
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CMP AX,[BX][%FD$BUFSZ]
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JA DIRECT1 ; Use direct file io
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XOR DX,DX ; already done is 0
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MOV SI,[BP][%PARM2] ; buffer pointer
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MOV DI,[BX][%FD$PTR]
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BINMOVE MOV CX,[BX][%FD$COUNT]
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JCXZ NOMOVE
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MOV AX,[BP][%PARM3]
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SUB AX,DX ; Additional needed
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CMP CX,AX
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JB MOVEALL
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MOV CX,AX ; Use only part of buffer
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MOVEALL PUSH CX
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MOV AX,DS
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MOV ES,AX
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MOV DI,[BX][%FD$PTR]
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CLD
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REP
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MOVSB
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POP CX
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SUB [BX][%FD$COUNT],CX
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MOV [BX][%FD$PTR],DI
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MOV %[BX][%FD$DIRTY],%FL$WRITE
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;
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; CX contains count of moved characters
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;
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NOMOVE ADD DX,CX
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MOV CX,[BP][%PARM3]
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SUB CX,DX ; Characters left
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JCXZ DONE4
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TEST %[BX][%FD$DIRTY],%FL$WRITE
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JZ NOWRITE
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TEST %[BX][%FD$FLAGS],%FL$APPEN
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JZ W1
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PUSH SI
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PUSH DI
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PUSH CX
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PUSH DX
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PUSH BX
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CALLFAR _seekend
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POP BX
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POP DX
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POP CX
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POP DI
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POP SI
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W1 MOV AX,>4000
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PUSH DX
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PUSH BX
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MOV %[BX][%FD$DIRTY],%0
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MOV DX,[BX][%FD$BUFR]
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MOV [BX][%FD$PTR],DX
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MOV CX,DI
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SUB CX,DX
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MOV BX,[BX][%FD$HNDL]
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JCXZ EMPTY
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INT >21
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POP BX
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POP DX
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JNB OK1
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FLERROR PUSH DX
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PUSH BX
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PUSH AX
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MOV BX,[_fileerr]
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CALLSEG [BX]
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POP BX
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POP BX
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POP DX
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MOV [BX][%FD$COUNT],0
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DONE4 MOV AX,DX
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POP BP
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RETSEG
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EMPTY POP BX
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POP DX
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XOR AX,AX
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;
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OK1 CMP AX,CX
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MOV AX,[BX][%FD$BUFSZ]
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MOV [BX][%FD$COUNT],AX
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JZ BINMOVE0
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MOV AX,E$NOSPAC
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JMPS FLERROR
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NOWRITE MOV CX,[BX][%FD$BUFSZ]
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MOV [BX][%FD$COUNT],CX
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MOV CX,[BX][%FD$BUFR]
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MOV [BX][%FD$PTR],CX
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BINMOVE0 JMP BINMOVE
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;
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DIRECT TEST %[BX][%FD$DIRTY],%FL$WRITE
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JZ DIR1
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PUSH BX
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CALLFAR _fflush
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POP BX
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DIR1 MOV AX,[BX][%FD$BUFR]
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MOV [BX][%FD$PTR],AX
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MOV [BX][%FD$COUNT],0
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MOV %[BX][%FD$DIRTY],0
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TEST %[BX][%FD$FLAGS],%FL$APPEN
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JZ W2
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PUSH BX
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CALLFAR _seekend
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POP BX
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W2 MOV AX,>4000
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MOV BX,[BX][%FD$HNDL]
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MOV CX,[BP][%PARM3]
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MOV DX,[BP][%PARM2]
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INT >21
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JB FLERROR
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POP BP
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RETSEG
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;
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; Write the file buffer
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; bx = file
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; di = current pointer
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; resets di to start of buffer, cx to length
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;
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PUTBLK PUSH DX
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PUSH BX
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MOV DX,[BX][%FD$BUFR]
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MOV CX,DI
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SUB CX,DX ; buffer count
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JCXZ EMPTY2
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TEST %[BX][%FD$FLAGS],%FL$APPEN
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JZ W3
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PUSH SI
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PUSH DI
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PUSH CX
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PUSH DX
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PUSH BX
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CALLFAR _seekend
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POP BX
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POP DX
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POP CX
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POP DI
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POP SI
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W3 MOV AX,>4000
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MOV BX,[BX][%FD$HNDL]
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INT >21
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POP BX
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POP DX
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JB ERROR
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EXITPUT MOV DI,[BX][%FD$BUFR]
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MOV CX,[BX][%FD$BUFSZ]
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MOV %[BX][%FD$DIRTY],%0
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CLC
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RET
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EMPTY2 POP BX
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POP DX
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JMPS EXITPUT
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ERROR POP BX
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PUSH BX
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PUSH BX
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PUSH AX
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MOV BX,[_fileerr]
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CALLSEG [BX]
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ADD SP,%4
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POP BX
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POP DX
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STC
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RET
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;
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END
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