127 lines
2.3 KiB
NASM
127 lines
2.3 KiB
NASM
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TITLE DISKIO
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include kernel.inc
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externFP Int21Handler
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sBegin CODE
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ASSUMES CS,CODE
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externNP MyAnsiToOem
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cProc I_lopen,<PUBLIC,FAR>
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; parmD lpFilename
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; parmW mode
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; localV OemBuffer,128
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cBegin nogen
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mov ch,3Dh ; Open File
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jmps loccommon
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cEnd nogen
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cProc I_lcreat,<PUBLIC,FAR>
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; parmD lpFilename
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; parmW attributes
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; localV OemBuffer,128
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cBegin nogen
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mov ch,3Ch ; Create File
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cEnd nogen
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errn$ loccommon
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cProc loccommon,<PUBLIC,FAR>
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parmD lpFilename
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parmW attributes
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localV OemBuffer,128
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cBegin
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; Common code for open and creat functions. CH = function code
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push cx
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lea bx, OemBuffer
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cCall MyAnsiToOem,<lpFilename,ss,bx>
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pop cx
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mov cl, byte ptr attributes
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mov ax,cx
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xor ch,ch
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smov ds, ss
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lea dx, OemBuffer
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DOSCALL
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jnc lopen_ok
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mov ax,-1
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lopen_ok:
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cEnd
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cProc I_lclose,<PUBLIC,FAR>
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; parmW fd
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cBegin nogen
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mov bx,sp
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mov bx,ss:[bx+4]
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mov ah,3Eh ; DOS file close function
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DOSCALL
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mov ax,-1
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jc lclose_end
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inc ax
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lclose_end:
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ret 2
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cEnd nogen
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cProc I_llseek,<PUBLIC,FAR>
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; parmW fh
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; parmD fileOffset
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; parmW mode
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cBegin nogen
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mov bx,sp
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mov dx,ss:[bx+6]
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mov cx,ss:[bx+8]
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mov ax,ss:[bx+4]
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mov bx,ss:[bx+10]
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mov ah,42h
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DOSCALL
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jnc lseek_ok
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mov ax,-1
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cwd ; must return a long
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lseek_ok:
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ret 8
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cEnd nogen
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cProc I_lwrite,<PUBLIC,FAR>
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; parmW fh
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; parmD lpBuf
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; parmW bufsize
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cBegin nogen
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mov cl,40h
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jmp short _lrw
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cEnd nogen
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cProc I_lread,<PUBLIC,FAR>
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; parmW fh
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; parmD lpBuf
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; parmW bufsize
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cBegin nogen
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mov cl,3fh
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errn$ _lrw
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cEnd nogen
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; Common code for read and write functions. CL = function code
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cProc _lrw,<PUBLIC,FAR>
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cBegin nogen
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mov bx,sp
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push ds
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mov ah,cl ; read or write operation
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mov cx,ss:[bx+4] ; bufSize
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lds dx,DWORD PTR ss:[bx+6] ; lpBuf
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mov bx,ss:[bx+10] ; fh
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DOSCALL
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pop ds
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jnc lwrite_ok
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mov ax,-1
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lwrite_ok:
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ret 8
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cEnd nogen
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sEnd CODE
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end
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