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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

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/**** dstring.h --- String manipulation.

 *

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

 *

 **** Commentary:

 *

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

 *

 * This file specifies the interface to a string manipulation facility.  There

 * are two types of strings supported: nstrings (strings are stored as a

 * length, and a vector of characters), and dstrings which are only of use

 * when it is necessary to append characters to a string one at a time with

 * reasonable efficiency.

 *

 * Null pointers are not valid as nstrings or dstrings. Passing a null pointer

 * as the argument to a function will have an undefined effect (on many

 * machines the program will abort, but this is not guaranteed).

 *

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

 *

 ** Type:	NStringT

 ** Type:	NStringP

 ** Repr:	<private>

 *

 * This is the nstring type.  These strings may contain null characters.

 *

 ** Type:	DStringT

 ** Type:	DStringP

 ** Repr:	<private>

 *

 * This is the dstring type.  It is only for appending characters and C

 * strings to.  Once it has been completely initialised, it should be

 * converted to one of the other string types.

 *

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

 *

 ** Function:	void			nstring_init

 *			PROTO_S ((NStringP nstring))

 ** Exceptions:

 *

 * This function initialises the specified nstring to be an empty nstring.

 *

 ** Function:	void			nstring_init_length

 *			PROTO_S ((NStringP nstring, unsigned length))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function initialises the specified nstring to be an nstring of the

 * specified length.  The initial contents are unspecified.

 *

 ** Function:	void			nstring_assign

 *			PROTO_S ((NStringP to, NStringP from))

 ** Exceptions:

 *

 * This function assigns the from nstring to the to nstring.  The from nstring

 * should not be used afterwards, without reinitialising it.

 *

 ** Function:	void			nstring_copy_cstring

 *			PROTO_S ((NStringP nstring, CStringP cstring))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function initialises the specified nstring from the content of the

 * specified cstring.

 *

 ** Function:	void			nstring_insert_cstring

 *			PROTO_S ((NStringP nstring, CStringP cstring))

 ** Exceptions:

 *

 * This function inserts the specified cstring into the specified nstring.

 * Sufficient characters are copied to fill up the nstring.

 *

 ** Function:	void			nstring_copy

 *			PROTO_S ((NStringP to, NStringP from))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function copies the specified from nstring into the specified to

 * nstring.

 *

 ** Function:	CStringP		nstring_to_cstring

 *			PROTO_S ((NStringP nstring))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function returns a dynamically allocated cstring copy of the specified

 * nstring.  If the nstring contains null characters, then the characters

 * after the first null will be ignored in the cstring (although they will

 * still be part of it).

 *

 ** Function:	unsigned		nstring_hash_value

 *			PROTO_S ((NStringP nstring))

 ** Exceptions:

 *

 * This function returns the hash value associated with the specified nstring.

 * This value is guaranteed to be identical for all nstrings with the same

 * content.

 *

 ** Function:	unsigned		nstring_length

 *			PROTO_S ((NStringP nstring))

 ** Exceptions:

 *

 * This function returns the length of the specified nstring.

 *

 ** Function:	CStringP		nstring_contents

 *			PROTO_S ((NStringP nstring))

 ** Exceptions:

 *

 * This function returns the contents of the specified nstring.

 *

 ** Function:	CmpT			nstring_compare

 *			PROTO_S ((NStringP nstring1, NStringP nstring2))

 ** Exceptions:

 *

 * This function returns ``CMP_LT'', ``CMP_EQ'', or ``CMP_GT'', depending on

 * whether the content of nstring1 is lexicographically less than, equal to,

 * or greater than the content of nstring2.

 *

 ** Function:	BoolT			nstring_equal

 *			PROTO_S ((NStringP nstring1, NStringP nstring2))

 ** Exceptions:

 *

 * This function returns true if the specified nstrings have the same content,

 * and false otherwise.

 *

 ** Function:	BoolT			nstring_ci_equal

 *			PROTO_S ((NStringP nstring1, NStringP nstring2))

 ** Exceptions:

 *

 * This function returns true if the specified nstrings have the same content

 * (ignoring differences in case), and false otherwise.

 *

 ** Function:	BoolT			nstring_contains

 *			PROTO_S ((NStringP nstring, char c))

 ** Exceptions:

 *

 * This function returns true if the specified nstring contains the specified

 * character, and false otherwise.

 *

 ** Function:	BoolT			nstring_is_prefix

 *			PROTO_S ((NStringP nstring1, NStringP nstring2))

 ** Exceptions:

 *

 * This function returns true if the second nstring is a prefix of the first

 * nstring, and false otherwise.

 *

 ** Function:	void			nstring_destroy

 *			PROTO_S ((NStringP nstring))

 ** Exceptions:

 *

 * This function deallocates the contents of the specified nstring.

 *

 ** Function:	void			write_nstring

 *			PROTO_S ((OStreamP stream, NStringP nstring))

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes the content of the specified nstring to the specified

 * ostream.

 *

 ** Function:	void			dstring_init

 *			PROTO_S ((DStringP dstring))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function initialises the specified dstring to be an empty dstring.

 *

 ** Function:	unsigned		dstring_length

 *			PROTO_S ((DStringP dstring))

 ** Exceptions:

 *

 * This function returns the length of the specified dstring.

 *

 ** Function:	void			dstring_append_char

 *			PROTO_S ((DStringP dstring, char c))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function appends the specified character to the specified dstring.

 *

 ** Function:	void			dstring_append_cstring

 *			PROTO_S ((DStringP dstring, CStringP cstring)

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function appends the content of the specified cstring to the specified

 * dstring.

 *

 ** Function:	void			dstring_append_nstring

 *			PROTO_S ((DStringP dstring, NStringP nstring)

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function appends the content of the specified nstring to the specified

 * dstring.

 *

 ** Function:	BoolT			dstring_last_char_equal

 *			PROTO_S ((DStringP dstring, char c))

 ** Exceptions:

 *

 * This function returns true if the last character of the specified dstring

 * is the same as the specified character, and false otherwise.  If the

 * dstring is empty, then false is always returned.

 *

 ** Function:	void			dstring_to_nstring

 *			PROTO_S ((DStringP dstring, NStringP nstring_ref))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function copies the content of the specified dstring into the

 * specified nstring.

 *

 ** Functions:	CStringP		dstring_to_cstring

 *			PROTO_S ((DStringP dstring))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function copies the content of the specified dstring into a

 * dynamically allocated cstring, and returns it.

 *

 ** Function:	CStringP		dstring_destroy_to_cstring

 *			PROTO_S ((DStringP dstring))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function does the equivalent of a call to ``dstring_to_cstring''

 * followed by a call to ``dstring_destroy''.  It returns a cstring that is

 * normally the internal cstring of the dstring (if there isn't enough room

 * for a null character at the end, then the cstring will need to be

 * reallocated).

 *

 ** Function:	void			dstring_destroy

 *			PROTO_S ((DStringP dstring))

 ** Exceptions:

 *

 * This function deallocates the contents of the specified dstring.

 *

 **** Change log:

 * $Log: dstring.h,v $

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

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/12  11:44:35  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  16:05:49  smf

 * Initial import of library shared files.

 *

**/

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

#ifndef H_DSTRING

#define H_DSTRING

#include "os-interface.h"

#include "cstring.h"

#include "dalloc.h"

#include "ostream.h"

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

typedef struct NStringT {

    unsigned			length;

    CStringP			contents;

} NStringT, *NStringP;

typedef struct DStringT {

    unsigned			length;

    unsigned			max_length;

    CStringP			contents;

} DStringT, *DStringP;

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

extern void			nstring_init

	PROTO_S ((NStringP));

extern void			nstring_init_length

	PROTO_S ((NStringP, unsigned));

extern void			nstring_assign

	PROTO_S ((NStringP, NStringP));

extern void			nstring_copy_cstring

	PROTO_S ((NStringP, CStringP));

extern void			nstring_insert_cstring

	PROTO_S ((NStringP, CStringP));

extern void			nstring_copy

	PROTO_S ((NStringP, NStringP));

extern CStringP			nstring_to_cstring

	PROTO_S ((NStringP));

extern unsigned			nstring_hash_value

	PROTO_S ((NStringP));

extern unsigned			nstring_length

	PROTO_S ((NStringP));

extern CStringP			nstring_contents

	PROTO_S ((NStringP));

extern CmpT			nstring_compare

	PROTO_S ((NStringP, NStringP));

extern BoolT			nstring_equal

	PROTO_S ((NStringP, NStringP));

extern BoolT			nstring_ci_equal

	PROTO_S ((NStringP, NStringP));

extern BoolT			nstring_contains

	PROTO_S ((NStringP, char));

extern BoolT			nstring_is_prefix

	PROTO_S ((NStringP, NStringP));

extern void			nstring_destroy

	PROTO_S ((NStringP));

extern void			write_nstring

	PROTO_S ((OStreamP, NStringP));

extern void			dstring_init

	PROTO_S ((DStringP));

extern unsigned			dstring_length

	PROTO_S ((DStringP));

extern void			dstring_append_char

	PROTO_S ((DStringP, char));

extern void			dstring_append_cstring

	PROTO_S ((DStringP, CStringP));

extern void			dstring_append_nstring

	PROTO_S ((DStringP, NStringP));

extern BoolT			dstring_last_char_equal

	PROTO_S ((DStringP, char));

extern void			dstring_to_nstring

	PROTO_S ((DStringP, NStringP));

extern CStringP			dstring_to_cstring

	PROTO_S ((DStringP));

extern CStringP			dstring_destroy_to_cstring

	PROTO_S ((DStringP));

extern void			dstring_destroy

	PROTO_S ((DStringP));

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

#ifdef FS_FAST

#define nstring_length(s) ((s)->length)

#define nstring_contents(s) ((s)->contents)

#define dstring_length(s) ((s)->length)

#endif /* defined (FS_FAST) */

#endif /* !defined (H_DSTRING) */

/*

 * Local variables(smf):

 * eval: (include::add-path-entry "../os-interface" "../generated")

 * end:

**/