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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

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        reproduced upon any copies or amended versions of it;

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        no liability whatsoever in relation to any use to which

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*/

/**** ostream.h --- Output stream handling.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 **** Commentary:

 *

 ***=== INTRODUCTION =========================================================

 *

 * This file specifies the interface to the output stream facility.

 *

 ***=== TYPES ================================================================

 *

 ** Type:	OStreamT

 ** Type:	OStreamP

 ** Repr:	<private>

 *

 * This is the output stream type.

 *

 ***=== CONSTANTS ============================================================

 *

 ** Constant:	ostream_output

 *

 * This is the standard output stream.  Its initial buffering state is

 * undefined.  The ``ostream_setup'' function must be called before this

 * constant is used.

 *

 ** Constant:	ostream_error

 *

 * This is the standard error stream.  Its initial buffering state is

 * undefined.  The ``ostream_setup'' function must be called before this

 * constant is used.

 *

 ***=== FUNCTIONS ============================================================

 *

 ** Function:	void			ostream_setup

 *			(void)

 ** Exceptions:

 *

 * This function initialises the output stream facility.  It should be called

 * before any other ostream manipulation function.

 *

 ** Function:	void			ostream_init

 *			(OStreamP ostream)

 ** Exceptions:

 *

 * This function initialises the specified ostream not to write to any file.

 *

 ** Function:	BoolT			ostream_open

 *			(OStreamP ostream, CStringP name)

 ** Exceptions:

 *

 * This function initialises the specified ostream to write to the file with

 * the specified name.  If the file cannot be opened, the function returns

 * false.  If the file is opened successfully, the function returns true.  The

 * name should not be modified or deallocated until the ostream has been

 * closed.  The initial buffering state of the ostream is fully buffered.

 *

 ** Function:	BoolT			ostream_is_open

 *			(OStreamP ostream)

 ** Exceptions:

 *

 * This function returns true if the specified ostream is writing to a file,

 * and false otherwise.

 *

 ** Function:	void			ostream_buffer

 *			(OStreamP ostream)

 ** Exceptions:

 *

 * This function sets the buffering state of the specified ostream to fully

 * buffered.

 *

 ** Function:	void			ostream_unbuffer

 *			(OStreamP ostream)

 *

 * This function sets the buffering state of the specified ostream to

 * unbuffered.

 *

 ** Function:	void			ostream_close

 *			(OStreamP ostream)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function closes the specified ostream.

 *

 ** Function:	void			ostream_flush

 *			(OStreamP ostream)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function flushes the ostream's output buffer.

 *

 ** Function:	CStringP		ostream_name

 *			(OStreamP ostream)

 ** Exceptions:

 *

 * This function returns the name of the file that the specified ostream is

 * writing to.  The return value should not be modified or deallocated.

 *

 ** Function:	unsigned		ostream_line

 *			(OStreamP ostream)

 ** Exceptions:

 *

 * This function returns one more than the number of newlines that have been

 * written to the specified ostream.  The result is undefined if the stream

 * is not open.

 *

 ** Function:	void			write_newline

 *			(OStreamP ostream)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes a newline to the specified ostream.

 *

 ** Function:	void			write_tab

 *			(OStreamP ostream)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes a tab to the specified ostream.

 *

 ** Function:	void			write_byte

 *			(OStreamP ostream, ByteT c)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified byte to the specified ostream.

 *

 ** Function:	void			write_char

 *			(OStreamP ostream, char c)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified character to the specified ostream.

 *

 ** Function:	void			write_escaped_char

 *			(OStreamP ostream, char c)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified character to the specified ostream.

 * This differs from the ``write_char'' function, in that it will

 * `pretty-print' non-printing characters.

 *

 ** Function:	void			write_int

 *			(OStreamP ostream, int i)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified integer to the specified ostream.

 *

 ** Function:	void			write_unsigned

 *			(OStreamP ostream, unsigned i)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified unsigned integer to the specified

 * ostream.

 *

 ** Function:	void			write_cstring

 *			(OStreamP ostream, CStringP cstring)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified C string to the specified ostream.

 *

 ** Function:	void			write_bytes

 *			(OStreamP ostream, ByteP bytes,

 *				  unsigned length)

 ** Exceptions: XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified sequence of bytes (of the specified

 * length) to the specified ostream.

 *

 ** Function:	void			write_chars

 *			(OStreamP ostream, CStringP chars,

 *				  unsigned length)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified sequence of characters (of the specified

 * length) to the specified ostream.

 *

 ** Function:	void			write_escaped_chars

 *			(OStreamP ostream, CStringP chars,

 *				  unsigned length)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the specified sequence of characters (of the specified

 * length) to the specified ostream.  This differs from the ``write_chars''

 * function, in that it will `pretty-print' non-printing characters.

 *

 ** Function:	void			write_system_error

 *			(OStreamP ostream);

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes a string containing a description of the current

 * system error (as defined by the ``errno'' global variable) to the specified

 * ostream.

 *

 ** Function:	void			write_pointer

 *			(OStreamP ostream, GenericP pointer);

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes a string containing the address of the object pointed

 * to by the pointer to the specified ostream.

 *

 ***=== EXCEPTIONS ===========================================================

 *

 ** Exception:	XX_ostream_write_error (CStringP name)

 *

 * This exception is raised if a write attempt fails.  The data thrown is a

 * copy of the name of the file on which the error occured.  The copy should

 * be deallocated when finished with.

 *

 **** Change Log:

 * $Log: ostream.h,v $

 * Revision 1.1.1.1  1998/01/17  15:57:46  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/12  11:45:50  smf

 * Performing changes for 'CR94_178.sid+tld-update' - bringing in line with

 * OSSG C Coding Standards.

 *

 * Revision 1.1.1.1  1994/07/25  16:06:12  smf

 * Initial import of os-interface shared files.

 *

**/

/****************************************************************************/

#ifndef H_OSTREAM

#define H_OSTREAM

#include "os-interface.h"

#include "dalloc.h"

#include "exception.h"

/*--------------------------------------------------------------------------*/

typedef struct OStreamT {

    FILE		       *file;

    CStringP			name;

    CStringP			gen_name;

    int				no;

    unsigned			line;

} OStreamT, *OStreamP;

/*--------------------------------------------------------------------------*/

extern ExceptionP	 XX_ostream_write_error;

extern OStreamT		*const ostream_output;

extern OStreamT		*const ostream_error;

/*--------------------------------------------------------------------------*/

extern void		ostream_setup(void);

extern void		ostream_init(OStreamP);

extern BoolT		ostream_open(OStreamP, CStringP);

extern BoolT		ostream_is_open(OStreamP);

extern void		ostream_buffer(OStreamP);

extern void		ostream_unbuffer(OStreamP);

extern void		ostream_close(OStreamP);

extern void		ostream_flush(OStreamP);

extern CStringP		ostream_name(OStreamP);

extern CStringP		ostream_gen_name(OStreamP);

extern unsigned		ostream_line(OStreamP);

extern void		write_newline(OStreamP);

extern void		write_tab(OStreamP);

extern void		write_byte(OStreamP, ByteT);

extern void		write_char(OStreamP, char);

extern void		write_escaped_char(OStreamP, char);

extern void		write_int(OStreamP, int);

extern void		write_unsigned(OStreamP, unsigned);

extern void		write_cstring(OStreamP, CStringP);

extern void		write_bytes(OStreamP, ByteP, unsigned);

extern void		write_chars(OStreamP, CStringP, unsigned);

extern void		write_escaped_chars(OStreamP, CStringP, unsigned);

extern void		write_system_error(OStreamP);

extern void		write_pointer(OStreamP, GenericP);

/*--------------------------------------------------------------------------*/

#ifdef FS_FAST

#define ostream_init(os)	((os)->name = NIL(CStringP))

#define ostream_is_open(os)	((os)->name != NIL(CStringP))

#define ostream_name(os)	((os)->name)

#define ostream_gen_name(os)	((os)->gen_name)

#define ostream_line(os)	((os)->line)

#endif /* defined (FS_FAST) */

#endif /* !defined (H_OSTREAM) */