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Docs » Include » dos » rdargs.i / .h
	IFND	DOS_RDARGS_I
DOS_RDARGS_I SET 1
**
**	$VER: rdargs.i 36.7 (12.7.1990)
**	Includes Release 45.1
**
**	ReadArgs() structure definitions
**
**	(C) Copyright 1989-2001 Amiga, Inc.
**	    All Rights Reserved
**

	IFND EXEC_NODES_I
	INCLUDE "exec/nodes.i"
	ENDC

**********************************************************************
*
* The CSource data structure defines the input source for "RdItem()"
* as well as the ReadArgs call.  It is a publicly defined structure
* which may be used by applications which use code that follows the
* conventions defined for access.
*
* When passed to the dos.library functions, the value passed as
* struct *CSource is defined as follows:
*	if ( CSource == 0)	Use buffered IO "ReadChar()" as data source
*	else			Use CSource for input character stream
*
* The following two pseudo-code routines define how the CSource structure
* is used:
*
* long CS_ReadChar( struct CSource *CSource )
* {
*	if ( CSource == 0 )	return ReadChar();
*	if ( CSource->CurChr >= CSource->Length )	return ENDSTREAMCHAR;
*	return CSource->Buffer[ CSource->CurChr++ ];
* }
*
* BOOL CS_UnReadChar( struct CSource *CSource )
* {
*	if ( CSource == 0 )	return UnReadChar();
*	if ( CSource->CurChr <= 0 )	return FALSE;
*	CSource->CurChr--;
*	return TRUE;
* }
*
* To initialize a struct CSource, you set CSource->CS_Buffer to
* a string which is used as the data source, and set CS_Length to
* the number of characters in the string.  Normally CS_CurChr should
* be initialized to ZERO, or left as it was from prior use as
* a CSource.
*
**********************************************************************

	STRUCTURE	CSource,0
		APTR	CS_Buffer
		LONG	CS_Length
		LONG	CS_CurChr
		LABEL	CS_SIZEOF

**********************************************************************
*
* The RDArgs data structure is the input parameter passed to the DOS
* ReadArgs() function call.
*
* The RDA_Source structure is a CSource as defined above;
* if RDA_Source.CS_Buffer is non-null, RDA_Source is used as the input
* character stream to parse, else the input comes from the buffered STDIN
* calls ReadChar/UnReadChar.
*
* RDA_DAList is a private address which is used internally to track
* allocations which are freed by FreeArgs().  This MUST be initialized
* to NULL prior to the first call to ReadArgs().
*
* The RDA_Buffer and RDA_BufSiz fields allow the application to supply
* a fixed-size buffer in which to store the parsed data.  This allows
* the application to pre-allocate a buffer rather than requiring buffer
* space to be allocated.  If either RDA_Buffer or RDA_BufSiz is NULL,
* the application has not supplied a buffer.
*
* RDA_ExtHelp is a text string which will be displayed instead of the
* template string, if the user is prompted for input.
*
* RDA_Flags bits control how ReadArgs() works.	The flag bits are
* defined below.  Defaults are initialized to ZERO.
*
**********************************************************************

	STRUCTURE	RDArgs,0
		STRUCT	RDA_Source,CS_SIZEOF	; Select input source
		APTR	RDA_DAList		; PRIVATE.
		LONG	RDA_Buffer		; Optional string parsing space.
		LONG	RDA_BufSiz		; Size of RDA_Buffer (0..n)
		APTR	RDA_ExtHelp		; Optional extended help
		LONG	RDA_Flags		; Flags for any required control
		LABEL	RDA_SIZEOF

	BITDEF	RDA,STDIN,0	; Use "STDIN" rather than "COMMAND LINE"
	BITDEF	RDA,NOALLOC,1	; If set, do not allocate extra string space.
	BITDEF	RDA,NOPROMPT,2	; Disable reprompting for string input.

**********************************************************************
* Maximum number of template keywords which can be in a template passed
* to ReadArgs(). IMPLEMENTOR NOTE - must be a multiple of 4.
**********************************************************************
MAX_TEMPLATE_ITEMS	equ	100

**********************************************************************
* Maximum number of MULTIARG items returned by ReadArgs(), before
* an ERROR_LINE_TOO_LONG.  These two limitations are due to stack
* usage.  Applications should allow "a lot" of stack to use ReadArgs().
**********************************************************************
MAX_MULTIARGS	equ	128

	ENDC	; DOS_RDARGS_I

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