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/*

 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 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.c --- String manipulation.

 *

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

 *

 **** Commentary:

 *

 * This file implements the string manipulation facility specified in the file

 * "dstring.h".  See that file for more details.

 *

 **** Change Log:

 * $Log: dstring.c,v $

 * Revision 1.1.1.1  1998/01/17  15:57:44  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/12  11:44:33  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.

 *

**/

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

#include "dstring.h"

#include "syntax.h"

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

#define DSTRING_CHUNK_SIZE 32

/*** Functions for manipulating nstrings.

**/

void

nstring_init(NStringP nstring)

{

    nstring->length   = 0;

    nstring->contents = NIL(CStringP);

}

void

nstring_init_length(NStringP nstring, unsigned length)

{

    nstring->length   = length;

    nstring->contents = ALLOCATE_VECTOR(char, length);

}

void

nstring_assign(NStringP to, NStringP from)

{

    to->length     = nstring_length(from);

    to->contents   = (from->contents);

}

void

nstring_copy_cstring(NStringP nstring, CStringP cstring)

{

    unsigned length = cstring_length(cstring);

    if (length > 0) {

	nstring->length   = length;

	nstring->contents = ALLOCATE_VECTOR(char, length);

	(void)memcpy((GenericP)(nstring->contents), (GenericP)cstring,

		     (SizeT)length);

    } else {

	nstring->length   = 0;

	nstring->contents = NIL(CStringP);

    }

}

void

nstring_insert_cstring(NStringP nstring, CStringP cstring)

{

    unsigned length = nstring_length(nstring);

    if (length > 0) {

	(void)memcpy((GenericP)(nstring->contents), (GenericP)cstring,

		     (SizeT)length);

    }

}

void

nstring_copy(NStringP to, NStringP from)

{

    unsigned length = nstring_length(from);

    if (length > 0) {

	to->length   = length;

	to->contents = ALLOCATE_VECTOR(char, length);

	(void)memcpy((GenericP)(to->contents),

		     (GenericP)(from->contents), (SizeT)length);

    } else {

	to->length   = 0;

	to->contents = NIL(CStringP);

    }

}

CStringP

nstring_to_cstring(NStringP nstring)

{

    unsigned length = nstring_length(nstring);

    CStringP tmp    = ALLOCATE_VECTOR(char, length + 1);

    if (length > 0) {

	(void)memcpy((GenericP)tmp, (GenericP)(nstring->contents),

		     (SizeT)length);

    }

    tmp[length] = '\0';

    return(tmp);

}

unsigned

nstring_hash_value(NStringP nstring)

{

    unsigned value        = 0;

    CStringP tmp_contents = (nstring->contents);

    unsigned tmp_length   = nstring_length(nstring);

    while (tmp_length--) {

	value += ((unsigned)(*tmp_contents++));

    }

    return(value);

}

#ifdef FS_FAST

#undef nstring_length

#endif /* defined (FS_FAST) */

unsigned

nstring_length(NStringP nstring)

{

    return(nstring->length);

}

#ifdef FS_FAST

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

#endif /* defined (FS_FAST) */

#ifdef FS_FAST

#undef nstring_contents

#endif /* defined (FS_FAST) */

CStringP

nstring_contents(NStringP nstring)

{

    return(nstring->contents);

}

#ifdef FS_FAST

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

#endif /* defined (FS_FAST) */

CmpT

nstring_compare(NStringP nstring1, NStringP nstring2)

{

    unsigned length = nstring_length(nstring1);

    int      status;

    if (length > nstring_length(nstring2)) {

	length = nstring_length(nstring2);

    }

    status = memcmp((GenericP)(nstring1->contents),

		    (GenericP)(nstring2->contents), (SizeT)length);

    if (status < 0) {

	return(CMP_LT);

    } else if (status > 0) {

	return(CMP_GT);

    } else if (nstring_length(nstring1) < nstring_length(nstring2)) {

	return(CMP_LT);

    } else if (nstring_length(nstring1) > nstring_length(nstring2)) {

	return(CMP_GT);

    } else {

	return(CMP_EQ);

    }

}

BoolT

nstring_equal(NStringP nstring1, NStringP nstring2)

{

    unsigned length = nstring_length(nstring1);

    return((length == nstring_length(nstring2)) &&

	   (memcmp((GenericP)(nstring1->contents),

		   (GenericP)(nstring2->contents), (SizeT)length) == 0));

}

BoolT

nstring_ci_equal(NStringP nstring1, NStringP nstring2)

{

    unsigned length = nstring_length(nstring1);

    if (length == nstring_length(nstring2)) {

	CStringP tmp1 = (nstring1->contents);

	CStringP tmp2 = (nstring2->contents);

	char c1;

	char c2;

	do {

	    c1 = syntax_upcase(*tmp1++);

	    c2 = syntax_upcase(*tmp2++);

	    if (length-- == 0) {

		return(TRUE);

	    }

	} while (c1 == c2);

    }

    return(FALSE);

}

BoolT

nstring_contains(NStringP nstring, char c)

{

    CStringP contents = nstring_contents(nstring);

    unsigned length   = nstring_length(nstring);

    return(memchr((GenericP)contents, c, (SizeT)length) != NIL(GenericP));

}

BoolT

nstring_is_prefix(NStringP nstring1,			   NStringP nstring2)

{

    CStringP contents1 = nstring_contents(nstring1);

    CStringP contents2 = nstring_contents(nstring2);

    unsigned length    = nstring_length(nstring2);

    return((length < nstring_length(nstring1)) &&

	   (memcmp((GenericP)contents1, (GenericP)contents2,

		   (SizeT)length) == 0));

}

void

nstring_destroy(NStringP nstring)

{

    DEALLOCATE(nstring->contents);

}

void

write_nstring(OStreamP ostream, NStringP nstring)

{

    unsigned length = nstring_length(nstring);

    if (length > 0) {

	write_chars(ostream, nstring->contents, length);

    }

}

/*** Functions for manipulating dstrings.

**/

void

dstring_init(DStringP dstring)

{

    dstring->length     = 0;

    dstring->max_length = DSTRING_CHUNK_SIZE;

    dstring->contents   = ALLOCATE_VECTOR(char, dstring->max_length);

}

#ifdef FS_FAST

#undef dstring_length

#endif /* defined (FS_FAST) */

unsigned

dstring_length(DStringP dstring)

{

    return(dstring->length);

}

#ifdef FS_FAST

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

#endif /* defined (FS_FAST) */

void

dstring_append_char(DStringP dstring, char c)

{

    if ((dstring->length) >= (dstring->max_length)) {

	CStringP tmp;

	dstring->max_length += DSTRING_CHUNK_SIZE;

	tmp                  = ALLOCATE_VECTOR(char, dstring->max_length);

	(void)memcpy((GenericP)tmp, (GenericP)(dstring->contents),

		     (SizeT)(dstring->length));

	DEALLOCATE(dstring->contents);

	dstring->contents = tmp;

    }

    dstring->contents[dstring->length++] = c;

}

void

dstring_append_cstring(DStringP dstring, CStringP cstring)

{

    unsigned clength = cstring_length(cstring);

    unsigned length  = (clength + (dstring->length));

    if (length > (dstring->max_length)) {

	CStringP tmp;

	while ((dstring->max_length) < length) {

	    dstring->max_length += DSTRING_CHUNK_SIZE;

	}

	tmp = ALLOCATE_VECTOR(char, dstring->max_length);

	(void)memcpy((GenericP)tmp, (GenericP)(dstring->contents),

		     (SizeT)(dstring->length));

	DEALLOCATE(dstring->contents);

	dstring->contents = tmp;

    }

  (void)memcpy((GenericP) & (dstring->contents[dstring->length]),

	       (GenericP)cstring, (SizeT)clength);

    dstring->length = length;

}

void

dstring_append_nstring(DStringP dstring, NStringP nstring)

{

    unsigned nlength = nstring_length(nstring);

    unsigned length  = (nlength + (dstring->length));

    if (length > (dstring->max_length)) {

	CStringP tmp;

	while ((dstring->max_length) < length) {

	    dstring->max_length += DSTRING_CHUNK_SIZE;

	}

	tmp = ALLOCATE_VECTOR(char, dstring->max_length);

	(void)memcpy((GenericP)tmp, (GenericP)(dstring->contents),

		     (SizeT)(dstring->length));

	DEALLOCATE(dstring->contents);

	dstring->contents = tmp;

    }

  (void)memcpy((GenericP) & (dstring->contents[dstring->length]),

	       (GenericP)nstring_contents(nstring), (SizeT)nlength);

    dstring->length = length;

}

BoolT

dstring_last_char_equal(DStringP dstring, char c)

{

    return((dstring->length) &&

	   ((dstring->contents[dstring->length - 1]) == c));

}

void

dstring_to_nstring(DStringP dstring, NStringP nstring)

{

    if (dstring->length > 0) {

	nstring->length   = (dstring->length);

	nstring->contents = ALLOCATE_VECTOR(char, dstring->length);

	(void)memcpy((GenericP)(nstring->contents),

		     (GenericP)(dstring->contents),

		     (SizeT)(dstring->length));

    } else {

	nstring->length   = 0;

	nstring->contents = NIL(CStringP);

    }

}

CStringP

dstring_to_cstring(DStringP dstring)

{

    CStringP tmp = ALLOCATE_VECTOR(char, dstring->length + 1);

    if (dstring->length > 0) {

	(void)memcpy((GenericP)tmp, (GenericP)(dstring->contents),

		     (SizeT)(dstring->length));

    }

    tmp[dstring->length] = '\0';

    return(tmp);

}

CStringP

dstring_destroy_to_cstring(DStringP dstring)

{

    CStringP tmp;

    if ((dstring->length) >= (dstring->max_length)) {

	tmp = ALLOCATE_VECTOR(char, (dstring->length) + 1);

	(void)memcpy((GenericP)tmp, (GenericP)(dstring->contents),

		     (SizeT)(dstring->length));

	DEALLOCATE(dstring->contents);

    } else {

	tmp = (dstring->contents);

    }

    tmp[dstring->length] = '\0';

    dstring->length       = 0;

    dstring->max_length   = 0;

    dstring->contents     = NIL(CStringP);

    return(tmp);

}

void

dstring_destroy(DStringP dstring)

{

    DEALLOCATE(dstring->contents);

}

/*

 * Local variables(smf):

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

 * end:

**/