2022-08-17 20:34:06 +00:00
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#
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! $Source$
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! $State$
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! $Revision$
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! Declare segments (the order is important).
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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.extern pmode_ds
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.extern pmode_cs
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.extern rmode
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.extern transfer_buffer_ptr
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.extern interrupt_ptr
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! Write bytes to/to a file descriptor. These routines do not do any
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! translation between CRLF and LF line endings.
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!
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! Note that, for MS-DOS, a raw "write" request of zero bytes will truncate
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! (or extend) the file to the current file position.
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.define __sys_rawwrite
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__sys_rawwrite:
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enter 4, 0
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amount_transferred = -1*4
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file_handle = 2*4
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read_buffer = 3*4
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amount_to_write = 4*4
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mov amount_transferred(ebp), 0
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mainloop:
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2022-08-17 22:24:08 +00:00
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mov eax, amount_to_write(ebp)
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test eax, eax
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jz exit
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2022-08-17 20:34:06 +00:00
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mov ecx, 32*1024
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2022-08-17 22:24:08 +00:00
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cmp eax, ecx
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2022-08-17 20:34:06 +00:00
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jge 2f
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2022-08-17 22:24:08 +00:00
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mov ecx, eax
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2022-08-17 20:34:06 +00:00
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2:
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2022-08-17 22:24:08 +00:00
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2022-08-17 20:34:06 +00:00
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! Copy ecx bytes into the transfer buffer.
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push ecx
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mov esi, read_buffer(ebp)
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movzx edi, (transfer_buffer_ptr)
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2022-08-17 22:24:08 +00:00
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mov es, (pmode_ds)
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cld
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2022-08-17 20:34:06 +00:00
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rep movsb
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pop ecx
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2022-08-17 22:24:08 +00:00
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! Write from the transfer buffer to DOS.
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2022-08-17 20:34:06 +00:00
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movb ah, 0x40
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o16 mov dx, (transfer_buffer_ptr)
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o16 mov bx, file_handle(ebp)
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or ebx, 0x210000
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callf (interrupt_ptr)
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2022-08-17 22:24:08 +00:00
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jc exit
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! Update counters and go again.
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2022-08-17 20:34:06 +00:00
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add read_buffer(ebp), eax
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add amount_transferred(ebp), eax
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sub amount_to_write(ebp), eax
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jmp mainloop
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exit:
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2022-08-17 22:24:08 +00:00
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mov eax, amount_transferred(ebp)
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2022-08-17 20:34:06 +00:00
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leave
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ret
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