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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/** This header file defines a portable library for allocating memory safely
** throughout FreeSCI.
** Implementations of basic functions found here are in this file and
** $(SRCDIR)/src/scicore/sci_memory.c
*
**************
*
* Sets behaviour if memory allocation call fails.
* UNCHECKED_MALLOCS: use C library routine without checks
* (nothing defined): check mallocs and exit immediately on fail (recommended)
*
** -- Alex Angas
**
**/
#ifndef _SCI_MEMORY_H
#define _SCI_MEMORY_H
#include "common/scummsys.h"
#include "sci/include/resource.h"
#ifdef _MSC_VER
# include <direct.h> // for chdir, rmdir, _gecwd, getcwd, mkdir
#endif
/********** the memory allocation macros **********/
#ifdef UNCHECKED_MALLOCS
#define ALLOC_MEM(alloc_statement, size, filename, linenum, funcname)\
do {\
alloc_statement;\
} while (0);
#else /* !UNCHECKED_MALLOCS */
#define ALLOC_MEM(alloc_statement, size, filename, linenum, funcname)\
do {\
if (size == 0) {\
warning("Allocating zero bytes of memory [%s (%s) : %u]", filename, funcname, linenum);\
} else if (!(size > 0)) {\
error("Cannot allocate negative bytes of memory [%s (%s) : %u]", filename, funcname, linenum);\
}\
\
alloc_statement; /* attempt to allocate the memory */\
\
if (res == NULL) {\
/* exit immediately */\
error("Memory allocation of %lu bytes failed [%s (%s) : %u]", size, filename, funcname, linenum);\
}\
} while (0);
#endif /* !UNCHECKED_MALLOCS */
/********** memory allocation routines **********/
extern void *sci_malloc(size_t size);
/* Allocates the specified amount of memory.
** Parameters: (size_t) size: Number of bytes to allocate
** Returns : (void *) A pointer to the allocated memory chunk
** To free this string, use the free() command.
** If the call fails, behaviour is dependent on the definition of SCI_ALLOC.
*/
extern void *sci_calloc(size_t num, size_t size);
/* Allocates num * size bytes of zeroed-out memory.
** Parameters: (size_t) num: Number of elements to allocate
** (size_t) size: Amount of memory per element to allocate
** Returns : (void *) A pointer to the allocated memory chunk
** To free this string, use the free() command.
** See _SCI_MALLOC() for more information if call fails.
*/
extern void *sci_realloc(void *ptr, size_t size);
/* Increases the size of an allocated memory chunk.
** Parameters: (void *) ptr: The original pointer
** (size_t) size: New size of the memory chunk
** Returns : (void *) A possibly new pointer, containing 'size'
** bytes of memory and everything contained in the original 'ptr'
** (possibly minus some trailing data if the new memory area is
** smaller than the old one).
** To free this string, use the free() command.
** See _SCI_MALLOC() for more information if call fails.
*/
extern char *sci_strdup(const char *src);
/* Duplicates a string.
** Parameters: (const char *) src: The original pointer
** Returns : (char *) a pointer to the storage location for the copied
** string.
** To free this string, use the free() command.
** See _SCI_MALLOC() for more information if call fails.
*/
extern char *sci_strndup(const char *src, size_t length);
/* Copies a string into a newly allocated memory part, up to a certain length.
** Parameters: (char *) src: The source string
** (int) length: The maximum length of the string (not counting
** a trailing \0).
** Returns : (char *) The resulting copy, allocated with sci_malloc().
** To free this string, use the free() command.
** See _SCI_MALLOC() for more information if call fails.
*/
/****************************************/
/* Refcounting garbage collected memory */
/****************************************/
/* Refcounting memory calls are a little slower than the others,
** and using it improperly may cause memory leaks. It conserves
** memory, though. */
extern void *sci_refcount_alloc(size_t length);
/* Allocates "garbage" memory
** Parameters: (size_t) length: Number of bytes to allocate
** Returns : (void *) The allocated memory
** Memory allocated in this fashion will be marked as holding one reference.
** It cannot be freed with 'free()', only by using sci_refcount_decref().
*/
extern void *sci_refcount_incref(void *data);
/* Adds another reference to refcounted memory
** Parameters: (void *) data: The data to add a reference to
** Returns : (void *) data
*/
extern void sci_refcount_decref(void *data);
/* Decrements the reference count for refcounted memory
** Parameters: (void *) data: The data to add a reference to
** Returns : (void *) data
** If the refcount reaches zero, the memory will be deallocated
*/
extern void *sci_refcount_memdup(void *data, size_t len);
/* Duplicates non-refcounted memory into a refcounted block
** Parameters: (void *) data: The memory to copy from
** (size_t) len: The number of bytes to copy/allocate
** Returns : (void *) Newly allocated refcounted memory
** The number of references accounted for will be one.
*/
#endif /* _SCI_MEMORY_H */
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