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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.

*/

/**** dalloc.c --- Memory allocation and deallocation.

 *

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

 *

 **** Commentary:

 *

 * This file implements the dynamic memory management facility specified in

 * the file "dalloc.h".  See that file for more information.

 *

 **** Change Log:

 * $Log: dalloc.c,v $

 * Revision 1.1.1.1  1998/01/17  15:57:45  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/12  11:45:28  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  16:06:09  smf

 * Initial import of os-interface shared files.

 *

**/

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

#include "dalloc.h"

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

ExceptionP XX_dalloc_no_memory = EXCEPTION ("cannot allocate memory");

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

#ifdef PO_DALLOC_DEBUG_ALIGN

#define DALLOC_MAGIC 0x21436587

#define ALIGN(x) (((int) (((x) + (PO_DALLOC_DEBUG_ALIGN) - 1) / \

			  (PO_DALLOC_DEBUG_ALIGN))) * (PO_DALLOC_DEBUG_ALIGN))

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

typedef struct DallocDataT {

    CStringP			file;

    unsigned			line;

    SizeT			size;

    int				magic;

} DallocDataT, *DallocDataP;

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

static SizeT dalloc_data_size = ALIGN (sizeof (DallocDataT));

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

#ifdef __NeXT__

#undef TRUE

#undef FALSE

#include <mach/mach.h>

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

GenericP

X__dalloc_allocate PROTO_N ((size, length, file, line))

		   PROTO_T (SizeT    size X

			    SizeT    length X

			    CStringP file X

			    unsigned line)

{

    GenericP tmp;

    ASSERT (size != 0);

    if (length == 0) {

	tmp = NIL (GenericP);

    } else {

	SizeT        real_size = (((size) * length) + dalloc_data_size);

	vm_address_t address;

	DallocDataP  data;

	ByteP        base;

	if (vm_allocate (task_self (), &address, (vm_size_t) real_size,

			 TRUE) != KERN_SUCCESS) {

	    THROW (XX_dalloc_no_memory);

	    UNREACHED;

	}

	data        = (DallocDataP) address;

	base        = (ByteP) address;

	tmp         = (base + dalloc_data_size);

	data->file  = file;

	data->line  = line;

	data->size  = real_size;

	data->magic = DALLOC_MAGIC;

    }

    return (tmp);

}

void

X__dalloc_deallocate PROTO_N ((ptr, file, line))

		     PROTO_T (GenericP ptr X

			      CStringP file X

			      unsigned line)

{

    if (ptr) {

	ByteP         pointer = (ByteP) ptr;

	DallocDataP   data    = (DallocDataP) (pointer - dalloc_data_size);

	vm_address_t  address = (vm_address_t) data;

	vm_size_t     size    = data->size;

	kern_return_t result;

	if (data->magic == 0) {

	    E_dalloc_multi_deallocate (ptr, file, line, data->file,

				       data->line);

	    UNREACHED;

	} else if (data->magic != DALLOC_MAGIC) {

	    E_dalloc_corrupt_block (ptr, file, line);

	    UNREACHED;

	}

	data->magic = 0;

	result = vm_protect (task_self (), address, size, FALSE, VM_PROT_NONE);

	ASSERT (result == KERN_SUCCESS);

    }

}

#else

GenericP

X__dalloc_allocate PROTO_N ((size, length, file, line))

		   PROTO_T (SizeT    size X

			    SizeT    length X

			    CStringP file X

			    unsigned line)

{

    GenericP tmp;

    ASSERT (size != 0);

    if (length == 0) {

	tmp = NIL (GenericP);

    } else {

	SizeT       real_size = ((size * length) + dalloc_data_size);

	ByteP       base;

	DallocDataP data;

	if ((tmp = malloc (real_size)) == NIL (GenericP)) {

	    THROW (XX_dalloc_no_memory);

	    UNREACHED;

	}

	(void) memset (tmp, 0, real_size);

	data        = tmp;

	base        = tmp;

	tmp         = (base + dalloc_data_size);

	data->file  = file;

	data->line  = line;

	data->magic = DALLOC_MAGIC;

    }

    return (tmp);

}

void

X__dalloc_deallocate PROTO_N ((ptr, file, line))

		     PROTO_T (GenericP ptr X

			      CStringP file X

			      unsigned line)

{

    if (ptr) {

	ByteP       pointer = (ByteP) ptr;

	DallocDataP data    = (DallocDataP) (pointer - dalloc_data_size);

	if (data->magic == 0) {

	    E_dalloc_multi_deallocate (ptr, file, line, data->file,

				       data->line);

	    UNREACHED;

	} else if (data->magic != DALLOC_MAGIC) {

	    E_dalloc_corrupt_block (ptr, file, line);

	    UNREACHED;

	}

	data->magic = 0;

	free ((GenericP) data);

    }

}

#endif /* defined (__NeXT__) */

#else

GenericP

X__dalloc_allocate PROTO_N ((size, length))

		   PROTO_T (SizeT size X

			    SizeT length)

{

    GenericP tmp;

    ASSERT (size != 0);

    if (length == 0) {

	tmp = NIL (GenericP);

    } else if ((tmp = calloc (length, size)) == NIL (GenericP)) {

	THROW (XX_dalloc_no_memory);

	UNREACHED;

    }

    return (tmp);

}

#endif /* defined (PO_DALLOC_DEBUG_ALIGN) */