361 lines
8.8 KiB
NASM
361 lines
8.8 KiB
NASM
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;
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; Copyright (c) Mix Software 1988
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;
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; fread(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 (read(fp->fd,buffer,itemsize*no_of_items) / itemsize); }
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;
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IDT fread
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DEF fread
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FREF read
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fread MOV BX,SP
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MOV SI,[BX][%PARM4-2]
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MOV AX,[BX][%PARM2-2]
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MOV CX,[BX][%PARM3-2]
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CMP AX,1
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JZ FREAD1SZ
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CMP CX,%1
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JZ FREAD1I
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MUL CX
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PUSH AX
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PUSH [BX][%PARM1-2]
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PUSH [SI][FD$SIZE]
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CALLFAR read
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ADD SP,%6
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MOV BX,SP
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MOV CX,[BX][%PARM2-2]
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CWD
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DIV CX
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RETSEG
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;
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; Item size is 1
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;
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FREAD1SZ PUSH CX
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PUSH [BX][%PARM1-2]
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PUSH [SI][FD$SIZE]
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CALLFAR read
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ADD SP,%6
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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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FREAD1I PUSH AX
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PUSH [BX][%PARM1-2]
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PUSH [SI][FD$SIZE]
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CALLFAR read
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ADD SP,%6
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MOV BX,SP
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CMP AX,[BX][%PARM2-2]
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JZ ONE
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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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; read(fd, buffer, n)
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; int n;
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; int fd;
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; char *buffer;
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;
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IDT read
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DEF read
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FREF _fflush
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FREF _getc
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REF _iob
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REF _fileerr
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read PUSH BP
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MOV BP,SP
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;
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; FILE *fp = _iob[fd];
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;
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MOV SI,[BP][%PARM1]
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ADD SI,SI
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ADD SI,_iob
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MOV SI,[SI]
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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 SI,SI ; File ok?
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; JZ ENDFL
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; CMP %[SI][%FD$INIT],%0
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; JZ ENDFL
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; CMP %[SI][%FD$OPEN],%0
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; JZ ENDFL
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;
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; if (fp->file.dirty & fdwrite) {
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; if (_fflush(fp) != 0) return 0;
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; }
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;
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TEST %[SI][%FD$DIRTY],%FL$WRITE
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JZ NOFLUSH
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PUSH SI
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CALLFAR _fflush
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POP SI
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TEST AX,AX
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JNZ ENDFL
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;
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; if (fp->file.flags & fdfilter) {
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; if (!(fp->file.flags & fdctlz)) {
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;
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NOFLUSH MOV AL,[SI][%FD$FLAGS]
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TEST AL,%FL$LFEED
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JZ NOCR
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;
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; Read and filter carriage return (but not ctlz)
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;
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; while (n-- != 0) {
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; c = _getc(fp);
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; while (c == RETURN) c = _getc(fp);
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; if (c==EOF) {
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; readcount = readcount-n-1;
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; n = 0;
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; }
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; else *buffer++ = c;
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; }
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;
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; bx = file
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; si = file buffer
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; di = buffer address
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; dx = count remaining
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; cx = buffer count
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;
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MOV BX,SI
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MOV DI,[BP][%PARM2]
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MOV DX,[BP][%PARM3] ; Requested count
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TEST DX,DX
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JZ DONE1
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MOV SI,[BX][%FD$PTR]
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MOV CX,[BX][%FD$COUNT]
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TEST AL,%FL$CTLZ
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JNZ CR_CTLZ
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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,>0D
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JZ SKIPCR1
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STOSB ; Store in read buffer
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DEC DX ; count character read
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JZ DONE1A ; read complete
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SKIPCR1 LOOP COPY1
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MORE1 MOV [BX][%FD$COUNT],CX ; Use _getc to get more
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MOV [BX][%FD$PTR],SI ; into buffer
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PUSH DX ; Save context
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PUSH DI
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PUSH BX ; Pass fp to _getc
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CALLFAR _getc
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MOV BX,DS
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MOV BX,BX
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POP BX
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POP DI
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POP DX
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MOV SI,[BX][%FD$PTR]
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MOV CX,[BX][%FD$COUNT]
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INC CX
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CMP AX,-1
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JNZ NEXTCH1
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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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DONE1A DEC CX
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DONE1B MOV [BX][%FD$COUNT],CX
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MOV [BX][%FD$PTR],SI
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JCXZ DONE1
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MOV %[BX][%FD$DIRTY],%FL$READ
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JMPS DONE1
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ENDFL XOR AX,AX
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POP BP
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RETSEG
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;
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; No filtering for end of line characters
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;
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NOCR TEST %[SI][%FD$FLAGS],%FL$CTLZ
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JZ BINMODE
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;
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; while (n-- != 0) {
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; c = _getc(fp);
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; if ((c==EOF) || (c == 0x1a) {
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; readcount = readcount-n-1;
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; n = 0; }
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; else *buffer++ = c;
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;
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MOV CX,[BP][%PARM3]
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MOV DI,[BP][%PARM2]
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JCXZ ENDFL3
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CPYCTLZ PUSH CX
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PUSH DI
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PUSH SI
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CALLFAR _getc
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POP SI
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POP DI
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POP CX
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CMP AX,-1
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JZ ENDFL3
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CMP AX,>001A
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JZ ENDFL3
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MOV %[DI],AL
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INC DI
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LOOP CPYCTLZ
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ENDFL3 MOV AX,[BP][%PARM3]
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SUB AX,CX
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POP BP
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RETSEG
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;
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;
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CR_CTLZ JCXZ MORE2
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COPY2 LODSB ; Get a byte
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NEXTCH2 CMP AL,>0D
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JZ SKIPCR2
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CMP AL,>1A
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JZ DONE1B
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MOV %[DI],AL ; Store in read buffer
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INC DI
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DEC DX ; count character read
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JZ DONE1A ; read complete
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SKIPCR2 LOOP COPY2
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MORE2 MOV [BX][%FD$COUNT],CX ; Use _getc to get more
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MOV [BX][%FD$PTR],SI ; into buffer
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PUSH DX ; Save context
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PUSH DI
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PUSH BX ; Pass fp to _getc
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CALLFAR _getc
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POP BX
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POP DI
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POP DX
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MOV SI,[BX][%FD$PTR]
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MOV CX,[BX][%FD$COUNT]
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INC CX
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CMP AX,-1
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JNZ NEXTCH2
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JMPS DONE1
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;
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; if (movcount = fp->file.count) {
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; if (movcount > n) movcount = n;
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; movmem(fp->file.ptr,buffer,movcount);
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; buffer += movcount;
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; fp->file.ptr += movcount;
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; fp->file.count -= movcount;
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; n -= movcount;
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; }
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;
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BINMODE TEST [SI][%FD$FLAGS],%FL$UNBUF
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JZ BUFR
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JMP NOBUFR
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BUFR XOR DX,DX ; already read is 0
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MOV DI,[BP][%PARM2] ; buffer pointer
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BINMOVE MOV CX,[SI][%FD$COUNT]
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JCXZ NOMOVE
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MOV AX,[BP][%PARM3]
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SUB AX,DX ; Additional needed
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CMP CX,AX
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JB MOVEALL
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MOV CX,AX ; Use only part of buffer
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MOVEALL PUSH CX
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MOV AX,DS
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MOV ES,AX
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PUSH SI
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MOV SI,[SI][%FD$PTR]
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CLD
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REP
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MOVSB
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MOV BX,SI
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POP SI
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POP CX
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SUB [SI][%FD$COUNT],CX
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MOV [SI][%FD$PTR],BX
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;
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; CX contains count of moved characters
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;
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; if (n) {
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; if (_sysabcd(0x3f00,fp->file.handle,n,buffer,&readcount) != 0) {
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; (*_fileerr)(readcount,fp);
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; return 0;
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; }
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; else {
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; if (readcount==0) fp->file.eofflag = 1;
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; return movcount+readcount;
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; }
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; }
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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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CMP CX,[SI][%FD$BUFSZ]
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JA READDIR
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MOV BX,[SI][%FD$HNDL]
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MOV AX,>3F00
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PUSH DX
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MOV DX,[SI][%FD$BUFR]
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MOV [SI][%FD$PTR],DX
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MOV CX,[SI][%FD$BUFSZ]
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INT >21
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JNB READOK1
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FLERROR PUSH SI
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PUSH AX
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MOV BX,[_fileerr]
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CALLSEG [BX]
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ADD SP,%4
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POP DX
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MOV [SI][%FD$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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READOK1 POP DX
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MOV [SI][%FD$COUNT],AX
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TEST AX,AX
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JZ DONE4
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JMPS BINMOVE
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;
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READDIR MOV AX,[SI][%FD$BUFR]
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MOV [SI][%FD$PTR],AX
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MOV [SI][%FD$COUNT],0
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MOV AX,>3F00
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MOV BX,[SI][%FD$HNDL]
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MOV CX,[BP][%PARM3]
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SUB CX,DX
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PUSH DX
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MOV DX,DI
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INT >21
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JB FLERROR
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POP DX
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ADD AX,DX
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POP BP
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RETSEG
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;
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NOBUFR MOV DI,[BP][%PARM2]
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TEST [SI][%FD$FLAGS],FL$BIN
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JZ NOBUFR0
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XOR DX,DX
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JMPS READDIR
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NOBUFR0 MOV CX,[BP][%PARM3]
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JCXZ ENDFL5
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UNBUF PUSH CX
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PUSH DI
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PUSH SI
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CALLFAR _getc
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POP SI
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POP DI
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POP CX
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CMP AX,-1
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JZ ENDFL5
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; CMP AX,>001A
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; JZ ENDFL5
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MOV %[DI],AL
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INC DI
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LOOP UNBUF
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ENDFL5 MOV AX,[BP][%PARM3]
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SUB AX,CX
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POP BP
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RETSEG
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END
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