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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.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  15:57:16  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 PROTO_N ((nstring))

	     PROTO_T (NStringP nstring)

{

    nstring->length   = 0;

    nstring->contents = NIL (CStringP);

}

void

nstring_init_length PROTO_N ((nstring, length))

		    PROTO_T (NStringP nstring X

			     unsigned length)

{

    nstring->length   = length;

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

}

void

nstring_assign PROTO_N ((to, from))

	       PROTO_T (NStringP to X

			NStringP from)

{

    to->length     = nstring_length (from);

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

}

void

nstring_copy_cstring PROTO_N ((nstring, cstring))

		     PROTO_T (NStringP nstring X

			      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 PROTO_N ((nstring, cstring))

		       PROTO_T (NStringP nstring X

				CStringP cstring)

{

    unsigned length = nstring_length (nstring);

    if (length > 0) {

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

		       (SizeT) length);

    }

}

void

nstring_copy PROTO_N ((to, from))

	     PROTO_T (NStringP to X

		      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 PROTO_N ((nstring))

		   PROTO_T (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 PROTO_N ((nstring))

		   PROTO_T (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 PROTO_N ((nstring))

	       PROTO_T (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 PROTO_N ((nstring))

		 PROTO_T (NStringP nstring)

{

    return (nstring->contents);

}

#ifdef FS_FAST

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

#endif /* defined (FS_FAST) */

CmpT

nstring_compare PROTO_N ((nstring1, nstring2))

		PROTO_T (NStringP nstring1 X

			 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 PROTO_N ((nstring1, nstring2))

	      PROTO_T (NStringP nstring1 X

		       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 PROTO_N ((nstring1, nstring2))

		 PROTO_T (NStringP nstring1 X

			  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 PROTO_N ((nstring, c))

		 PROTO_T (NStringP nstring X

			  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 PROTO_N ((nstring1, nstring2))

		  PROTO_T (NStringP nstring1 X

			   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 PROTO_N ((nstring))

		PROTO_T (NStringP nstring)

{

    DEALLOCATE (nstring->contents);

}

void

write_nstring PROTO_N ((ostream, nstring))

	      PROTO_T (OStreamP ostream X

		       NStringP nstring)

{

    unsigned length = nstring_length (nstring);

    if (length > 0) {

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

    }

}

/*** Functions for manipulating dstrings.

**/

void

dstring_init PROTO_N ((dstring))

	     PROTO_T (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 PROTO_N ((dstring))

	       PROTO_T (DStringP dstring)

{

    return (dstring->length);

}

#ifdef FS_FAST

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

#endif /* defined (FS_FAST) */

void

dstring_append_char PROTO_N ((dstring, c))

		    PROTO_T (DStringP dstring X

			     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 PROTO_N ((dstring, cstring))

		       PROTO_T (DStringP dstring X

				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 PROTO_N ((dstring, nstring))

		       PROTO_T (DStringP dstring X

				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 PROTO_N ((dstring, c))

			PROTO_T (DStringP dstring X

				 char     c)

{

    return ((dstring->length) &&

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

}

void

dstring_to_nstring PROTO_N ((dstring, nstring))

		   PROTO_T (DStringP dstring X

			    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 PROTO_N ((dstring))

		   PROTO_T (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 PROTO_N ((dstring))

			   PROTO_T (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 PROTO_N ((dstring))

		PROTO_T (DStringP dstring)

{

    DEALLOCATE (dstring->contents);

}

/*

 * Local variables(smf):

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

 * end:

**/