/*
 * Copyright (c) 2007 The Akuma Project
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * $Id: dstring.c 133 2007-05-29 14:32:04Z asmodai $
 */
/*
    		 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:
**/