system.inc

开放源码的编译器open watcom 1.6.0版的源代码

	.386
	.model small
	option oldstructs
	option proc:private


	include equmac.inc
	include c.inc


;******************************************************************************
;Run specified program with command line. Passes statement to command.com.
;
;Usage: Run(statement);
;
;statement	- ASCII statement to pass to command.com
;
;Returns:
;
;AL	- DOS exec error code.
;AH	- errorlevel if AL == 0.
;
;******************************************************************************
	externdef run:near


;*******************************************************************************
;Allocate some locked memory.
;
;Usage: MallocL(bytes);
;
;bytes	- Bytes required.
;
;Returns:
;
;EAX	- Address of allocated memory, zero on error.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef mallocl:near


;*******************************************************************************
;Free some locked memory.
;
;Usage: FreeL(void *memory);
;
;memory	- Address to release.
;
;On Exit:
;
;EAX	- Address released if ok, zero on error.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef freel:near


;*******************************************************************************
;Lock a memory region.
;
;Usage: MemLock(void *memory, int bytes);
;
;memory	- address to lock
;bytes	- bytes to lock.
;
;Returns:
;
;EAX	- bytes locked. (basicly bytes or zero)
;
;*******************************************************************************
	externdef memlock:near


;*******************************************************************************
;Unlock a memory region.
;
;Usage: MemUnLock(void *memory, int bytes);
;
;memory	- address to unlock.
;bytes	- bytes to unlock.
;
;Returns:
;
;EAX	- bytes un-locked.
;
;*******************************************************************************
	externdef memunlock:near


;*******************************************************************************
;
;Allocate some conventional memory.
;
;Usage: mallocdos(bytes);
;
;bytes	- bytes to allocate.
;
;On Exit:
;
;EAX	- memory allocated, zero if failed.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef mallocdos:near


;*******************************************************************************
;
;Re-allocate some memory allocated with "MallocDOS".
;
;Usage: reallocdos(old_mem, bytes);
;
;old_mem	- existing memory address.
;bytes	- new size in bytes.
;
;Returns:
;
;EAX	- memory allocated, zero if failed.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef reallocdos:near


;*******************************************************************************
;
;Free some memory allocated with "MallocDOS".
;
;Usage: freedos(memory);
;
;memory	- address of allocated memory.
;
;Returns:
;
;All registers preserved.
;
;*******************************************************************************
	externdef freedos:near


;******************************************************************************
;Allocate memory for, and load, a file.
;
;Usage: LoadAlloc(filename);
;
;filename - name of file to load.
;
;Returns:
;
;EAX	- error code if < 4 else load address.
;	0 - file not found
;	1 - file read error.
;	2 - not enough memory.
;
;All other registers preseved.
;
;******************************************************************************
	externdef LoadAlloc:near


;******************************************************************************
;Allocate locked memory for, and load, a file. Copes with CWC compresion.
;
;Usage: LoadAllocL(filename);
;
;filename - name of file to load.
;
;Returns:
;
;EAX	- error code if < 4 else load address.
;	0 - file not found
;	1 - file read error.
;	2 - not enough memory.
;
;All other registers preseved.
;
;******************************************************************************
	externdef LoadAllocL:near


;*******************************************************************************
;
;Open a file and setup buffering for it.
;
;Usage: OpenFile(filename,flags);
;
;filename	- pointer to zero terminated ASCII file name.
;flags	- flags.
;
;Returns:
;
;EAX	- file access handle.
;
;If EAX=0 then the open failed and FIOError has the error code.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef OpenFile:near
	externdef REDOpenFile:dword


;*******************************************************************************
;
;Create a file and setup buffering for it.
;
;Usage: CreateFile(filename,flags);
;
;filename	- pointer to zero terminated ASCII file name.
;flags	- flags.
;
;Returns:
;
;EAX	- file access handle.
;
;If EAX=0 then the create failed and FIOError has the error code.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef CreateFile:near


;*******************************************************************************
;
;Close a file opened with "OpenFile" or "CreateFile". Any dirty data in the
;buffer will be flushed first.
;
;Usage: CloseFile(handle);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;
;Returns:
;
;EAX	- error code, zero for none. FIOError is also updated.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef CloseFile:near


;*******************************************************************************
;
;Set file pointer within a file opened with "OpenFile" or "CreateFile".
;
;Usage: SeekFile(handle,offset,mode);
;
;mode	- mode (same as DOS)
;handle	- file handle returned by "OpenFile" or "CreateFile"
;offset	- new pointer value to set.
;
;Returns:
;
;EAX	- absolute offset or error detected if -1.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef SeekFile:near


;*******************************************************************************
;
;Read data from a file opened with "OpenFile" or "CreateFile".
;
;Usage: ReadFile(handle,buffer,bytes);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;buffer	- address to transfer data to.
;bytes	- number of bytes to read.
;
;Returns:
;
;EAX	- bytes transfered, -1 for error & FIOError has error code.
;
;*******************************************************************************
	externdef ReadFile:near


;*******************************************************************************
;
;Read an ASCII line of data from a file.
;
;Usage: ReadLineFile(handle,buffer,maxlen);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;buffer	- buffer to put the line in.
;maxlen	- maximum line length to allow.
;
;Returns:
;
;EAX	- status.
;	0=line is in buffer.
;	1=EOF, nothing in the buffer.
;	2=line length overun.
;	3=read error.
;	4=CR/LF pair mismatch.
;
;A zero terminated string with CR, LF and soft EOF's removed is read into the
;buffer specified. The removal of CR & LF and soft EOF's are the only
;modifications applied to the data read.
;
;Notes:
;
;EOF is never returned with data in the buffer. Even if EOF is encountered at
;the end of a line with no CR/LF that line will be returned as normal. The next
;use of this function will return EOF.
;
;Line length overrun returns a valid buffer (zero terminated) and the file
;pointer is moved to the next line ready for the next line read. It's upto the
;caller what to do about this error but this function will continue to work
;correctly after this error has been returned.
;
;A read error may be returned with some data in the buffer but generaly that
;data should be regarded as unreliable. Further use of this function should be
;avoided after a read error is reported.
;
;A CR/LF pair mismatch is reported when a CR is read and the next byte isn't an
;LF. The consequences are the same as for a read error.
;
;*******************************************************************************
	externdef ReadLineFile:near


;*******************************************************************************
;
;Read a byte from a file opened with "OpenFile" or "CreateFile".
;
;Usage: ReadByteFile(handle);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;
;Returns:
;
;EAX	- byte read or -1 for error, FIOError is error code.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef ReadByteFile:near


;*******************************************************************************
;
;Write data to a file opened with "OpenFile" or "CreateFile".
;
;Usage: WriteFile(handle,buffer,bytes);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;buffer	- address to transfer data from.
;bytes	- number of bytes to write.
;
;Returns:
;
;EAX	- bytes written or -1 on error, FIOError has error code.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef WriteFile:near


;*******************************************************************************
;
;Write a byte to a file opened with "OpenFile" or "CreateFile".
;
;Usage: WriteByteFile(handle,byte);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;byte	- byte to write.
;
;Returns:
;
;EAX	- byte written, -1 for error & FIOError has error code.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef WriteByteFile:near


;*******************************************************************************
;
;Flush any dirty buffered data for a file opened with "OpenFile" or "CreateFile"
;to disk.
;
;Usage: FlushFile(handle);
;
;handle	- file handle returned by "OpenFile" or "CreateFile"
;
;Returns:
;
;EAX	- error code, zero for no error.
;
;All other registers preserved.
;
;*******************************************************************************
	externdef FlushFile:near


;*******************************************************************************
;
;Buffer size and error code storage to use with above functions.
;
;*******************************************************************************
	externdef FIOBufferSize:dword
	externdef FIOError:dword


FIO_struc	struc
FIO_Flags	dd ?		;Control flags.
FIO_Flags_DOS	equ 1		;Buffer is in conventional memory.
FIO_Flags_Dirty equ 2	;Buffer is dirty.
FIO_Handle	dd ?		;File's DOS handle.
FIO_Pointer	dd ?		;Current file pointer position.
FIO_BPointer	dd ?		;Buffer file pointer position.
FIO_Buffered	dd ?		;Number of bytes in the buffer.
FIO_Length	dd ?		;Length of the buffer.
FIO_Spare	dd 2 dup (?)	;reserved.
FIO_struc	ends


;*******************************************************************************
;Copy a file to specified destination.
;
;Usage: CopyFile(source,dest);
;
;source	- source file name.
;dest	- destination file name.
;
;Returns:
;
;EAX	- bytes copied, -1 on error.
;
;*******************************************************************************
	externdef CopyFile:near


;*******************************************************************************
;Build a list of all valid drives on the system.
;
;Usage: GetDrives(char *buffer);
;
;buffer	- Address to build list of drives.
;
;On Exit:
;
;EAX	- number of drives.
;
;ALL other registers preserved.
;
;The drive list uses real drive codes (not ASCII). Each entry uses 1 byte
;and the list is terminated with -1.
;
;*******************************************************************************
	externdef GetDrives:near


;******************************************************************************
;
;Get the current drive.
;
;Usage: GetDrive();
;
;Returns:
;
;EAX	- Drive code.
;
;******************************************************************************
	externdef GetDrive:near


;*******************************************************************************
;Get current drive and path.
;
;Usage: GetPath(char *buffer);
;
;buffer	- pointer to buffer.
;
;On Exit:
;
;ALL registers preserved.
;
;*******************************************************************************
	externdef GetPath:near


;******************************************************************************
;
;Set the current drive.
;
;Usage: SetDrive(drive);
;
;drive	- drive code to set.
;
;Returns:
;
;ALL registers preserved.
;
;******************************************************************************
	externdef SetDrive:near


;*******************************************************************************
;Set current drive and path.
;
;Usage: SetPath(char *buffer);
;
;buffer	- pointer to path string.
;
;On Exit:
;
;EAX	- error code.
;0	- no error.
;
;ALL other registers preserved.
;
;*******************************************************************************
	externdef SetPath:near


;*******************************************************************************
;Get key press info.
;