ReC98/libs/BorlandC/write.asm

234 lines
4.0 KiB
NASM

___WRITE_CHUNK_SIZE equ 128
; int __cdecl __write(int fd, const void *buf, unsigned int len)
___write proc DIST
if LDATA
___WRITE_CRBUF_OFFSET equ 10h + ___WRITE_CHUNK_SIZE
@@sbuf = DPTR_ -0Eh
@@c = byte ptr -9
@@remainder = word ptr -8
@@tbuf = DPTR_ -6
else
___WRITE_CRBUF_OFFSET equ 0Ah + ___WRITE_CHUNK_SIZE
@@sbuf = word ptr -8
@@c = byte ptr -5
@@remainder = word ptr -4
endif
@@crbuf = byte ptr -___WRITE_CRBUF_OFFSET
@@chunk = word ptr -2
@@fd = word ptr dPtrSize + 2
@@buf = dword ptr dPtrSize + 4
@@len = word ptr dPtrSize + 4 + dPtrSize
push bp
mov bp, sp
sub sp, ___WRITE_CRBUF_OFFSET
push si
push di
mov ax, [bp+@@fd]
cmp ax, __nfile
jb short @@writeCheckLen
mov ax, 6
push ax
call __IOERROR
jmp @@writeRet
@@writeCheckLen:
mov ax, [bp+@@len]
inc ax
cmp ax, 2
jnb short @@writeSeek
xor ax, ax
jmp @@writeRet
@@writeSeek:
mov bx, [bp+@@fd]
add bx, bx
test byte ptr (_openfd+1)[bx], 8
jz short @@writeBinary
mov ax, 2
push ax
xor ax, ax
push ax
push ax
push [bp+@@fd]
nopcall _lseek
add sp, 8
@@writeBinary:
mov bx, [bp+@@fd]
add bx, bx
test byte ptr (_openfd+1)[bx], 40h
jnz short @@writeFlipEOF
push [bp+@@len]
if LDATA
push word ptr [bp+@@buf+2]
endif
push word ptr [bp+@@buf]
push [bp+@@fd]
nopcall __rtl_write
add sp, 4 + dPtrSize
jmp @@writeRet
@@writeFlipEOF:
mov bx, [bp+@@fd]
add bx, bx
and _openfd[bx], 0FDFFh
if LDATA
mov dx, word ptr [bp+@@buf+2]
endif
mov ax, word ptr [bp+@@buf]
if LDATA
mov word ptr [bp+@@sbuf+2], dx
endif
mov word ptr [bp+@@sbuf], ax
mov ax, [bp+@@len]
mov [bp+@@remainder], ax
jmp short @@writeSetTBuf
@@writeCRLF:
dec [bp+@@remainder]
LES_ bx, [bp+@@sbuf]
inc word ptr [bp+@@sbuf]
if LDATA
mov al, es:[bx]
mov [bp+@@c], al
cmp al, 0Ah
jnz short @@writeCopy
les bx, [bp+@@tbuf]
mov byte ptr es:[bx], 0Dh
inc word ptr [bp+@@tbuf]
@@writeCopy:
les bx, [bp+@@tbuf]
mov al, [bp+@@c]
mov es:[bx], al
inc word ptr [bp+@@tbuf]
lea ax, [bp+@@crbuf]
mov dx, word ptr [bp+@@tbuf]
xor bx, bx
sub dx, ax
sbb bx, 0
or bx, bx
jl short @@writeLoopCheck
jnz short @@writeChunk
cmp dx, ___WRITE_CHUNK_SIZE
jb short @@writeLoopCheck
@@writeChunk:
lea ax, [bp+@@crbuf]
mov dx, word ptr [bp+@@tbuf]
xor bx, bx
sub dx, ax
sbb bx, 0
else
mov al, [bx]
mov [bp+@@c], al
cmp al, 0Ah
jnz short @@writeCopy
mov bx, cx
mov byte ptr [bx], 0Dh
inc cx
@@writeCopy:
mov bx, cx
mov al, [bp+@@c]
mov [bx], al
inc cx
lea ax, [bp+@@crbuf]
mov dx, cx
sub dx, ax
cmp dx, ___WRITE_CHUNK_SIZE
jl short @@writeLoopCheck
mov dx, cx
sub dx, ax
endif
mov [bp+@@chunk], dx
push dx
pushSS_
push ax
push [bp+@@fd]
nopcall __rtl_write
add sp, 4 + dPtrSize
mov dx, ax
cmp ax, [bp+@@chunk]
jz short @@writeSetTBuf
cmp dx, 0FFFFh
jnz short @@writeRetLRRC
mov ax, -1
jmp short @@writeRetJump
@@writeRetLRRC:
mov ax, [bp+@@len]
sub ax, [bp+@@remainder]
jmp short @@writeRetRC
@@writeSetTBuf:
if LDATA
lea ax, [bp+@@crbuf]
mov word ptr [bp+@@tbuf+2], ss
mov word ptr [bp+@@tbuf], ax
@@writeLoopCheck:
cmp [bp+@@remainder], 0
jz short @@writeRest
jmp @@writeCRLF
@@writeRest:
lea ax, [bp+@@crbuf]
mov dx, word ptr [bp+@@tbuf]
xor bx, bx
sub dx, ax
sbb bx, 0
else
lea cx, [bp+@@crbuf]
@@writeLoopCheck:
cmp [bp+@@remainder], 0
jnz short @@writeCRLF
lea ax, [bp+@@crbuf]
mov dx, cx
sub dx, ax
endif
mov [bp+@@chunk], dx
mov ax, dx
or ax, ax
jbe short @@writeRetL
push dx
pushSS_
lea ax, [bp+@@crbuf]
push ax
push [bp+@@fd]
nopcall __rtl_write
add sp, 4 + dPtrSize
mov dx, ax
cmp ax, [bp+@@chunk]
jz short @@writeRetL
cmp dx, 0FFFFh
jnz short @@writeRetLRC
mov ax, -1
jmp short @@writeRetJump
@@writeRetLRC:
mov ax, [bp+@@len]
@@writeRetRC:
add ax, dx
sub ax, [bp+@@chunk]
@@writeRetJump:
jmp short @@writeRet
@@writeRetL:
mov ax, [bp+@@len]
@@writeRet:
pop di
pop si
mov sp, bp
pop bp
ret
___write endp