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+/****************************************************************************
+*
+*                   SciTech OS Portability Manager Library
+*
+*  ========================================================================
+*
+*    The contents of this file are subject to the SciTech MGL Public
+*    License Version 1.0 (the "License"); you may not use this file
+*    except in compliance with the License. You may obtain a copy of
+*    the License at http://www.scitechsoft.com/mgl-license.txt
+*
+*    Software distributed under the License is distributed on an
+*    "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+*    implied. See the License for the specific language governing
+*    rights and limitations under the License.
+*
+*    The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
+*
+*    The Initial Developer of the Original Code is SciTech Software, Inc.
+*    All Rights Reserved.
+*
+*  ========================================================================
+*
+* Language:     ANSI C
+* Environment:  Any
+*
+* Description:  Module for implementing the PM library overrideable memory
+*               allocator functions.
+*
+****************************************************************************/
+
+#include "pmapi.h"
+
+/*--------------------------- Global variables ----------------------------*/
+
+void * (*__PM_malloc)(size_t size)              = malloc;
+void * (*__PM_calloc)(size_t nelem,size_t size) = calloc;
+void * (*__PM_realloc)(void *ptr,size_t size)   = realloc;
+void (*__PM_free)(void *p)                      = free;
+
+/*----------------------------- Implementation ----------------------------*/
+
+/****************************************************************************
+DESCRIPTION:
+Use local memory allocation routines.
+
+HEADER:
+pmapi.h
+
+PARAMETERS:
+malloc  - Pointer to new malloc routine to use
+calloc  - Pointer to new caalloc routine to use
+realloc - Pointer to new realloc routine to use
+free    - Pointer to new free routine to use
+
+REMARKS:
+Tells the PM library to use a set of user specified memory allocation
+routines instead of using the normal malloc/calloc/realloc/free standard
+C library functions. This is useful if you wish to use a third party
+debugging malloc library or perhaps a set of faster memory allocation
+functions with the PM library, or any apps that use the PM library (such as
+the MGL). Once you have registered your memory allocation routines, all
+calls to PM_malloc, PM_calloc, PM_realloc and PM_free will be revectored to
+your local memory allocation routines.
+
+This is also useful if you need to keep track of just how much physical
+memory your program has been using. You can use the PM_availableMemory
+function to find out how much physical memory is available when the program
+starts, and then you can use your own local memory allocation routines to
+keep track of how much memory has been used and freed.
+
+NOTE: This function should be called right at the start of your application,
+      before you initialise any other components or libraries.
+
+NOTE: Code compiled into Binary Portable DLL's and Drivers automatically
+      end up calling these functions via the BPD C runtime library.
+
+SEE ALSO:
+PM_malloc, PM_calloc, PM_realloc, PM_free, PM_availableMemory
+****************************************************************************/
+void PMAPI PM_useLocalMalloc(
+    void * (*malloc)(size_t size),
+    void * (*calloc)(size_t nelem,size_t size),
+    void * (*realloc)(void *ptr,size_t size),
+    void (*free)(void *p))
+{
+    __PM_malloc = malloc;
+    __PM_calloc = calloc;
+    __PM_realloc = realloc;
+    __PM_free = free;
+}
+
+/****************************************************************************
+DESCRIPTION:
+Allocate a block of memory.
+
+HEADER:
+pmapi.h
+
+PARAMETERS:
+size    - Size of block to allocate in bytes
+
+RETURNS:
+Pointer to allocated block, or NULL if out of memory.
+
+REMARKS:
+Allocates a block of memory of length size. If you have changed the memory
+allocation routines with the PM_useLocalMalloc function, then calls to this
+function will actually make calls to the local memory allocation routines
+that you have registered.
+
+SEE ALSO:
+PM_calloc, PM_realloc, PM_free, PM_useLocalMalloc
+****************************************************************************/
+void * PMAPI PM_malloc(
+    size_t size)
+{
+    return __PM_malloc(size);
+}
+
+/****************************************************************************
+DESCRIPTION:
+Allocate and clear a large memory block.
+
+HEADER:
+pmapi.h
+
+PARAMETERS:
+nelem   - number of contiguous size-byte units to allocate
+size    - size of unit in bytes
+
+RETURNS:
+Pointer to allocated memory if successful, NULL if out of memory.
+
+REMARKS:
+Allocates a block of memory of length (size * nelem), and clears the
+allocated area with zeros (0). If you have changed the memory allocation
+routines with the PM_useLocalMalloc function, then calls to this function
+will actually make calls to the local memory allocation routines that you
+have registered.
+
+SEE ALSO:
+PM_malloc, PM_realloc, PM_free, PM_useLocalMalloc
+****************************************************************************/
+void * PMAPI PM_calloc(
+    size_t nelem,
+    size_t size)
+{
+    return __PM_calloc(nelem,size);
+}
+
+/****************************************************************************
+DESCRIPTION:
+Re-allocate a block of memory
+
+HEADER:
+pmapi.h
+
+PARAMETERS:
+ptr     - Pointer to block to resize
+size    - size of unit in bytes
+
+RETURNS:
+Pointer to allocated memory if successful, NULL if out of memory.
+
+REMARKS:
+This function reallocates a block of memory that has been previously been
+allocated to the new of size. The new size may be smaller or larger than
+the original block of memory. If you have changed the memory allocation
+routines with the PM_useLocalMalloc function, then calls to this function
+will actually make calls to the local memory allocation routines that you
+have registered.
+
+SEE ALSO:
+PM_malloc, PM_calloc, PM_free, PM_useLocalMalloc
+****************************************************************************/
+void * PMAPI PM_realloc(
+    void *ptr,
+    size_t size)
+{
+    return __PM_realloc(ptr,size);
+}
+
+/****************************************************************************
+DESCRIPTION:
+Frees a block of memory.
+
+HEADER:
+pmapi.h
+
+PARAMETERS:
+p   - Pointer to memory block to free
+
+REMARKS:
+Frees a block of memory previously allocated with either PM_malloc,
+PM_calloc or PM_realloc.
+
+SEE ALSO:
+PM_malloc, PM_calloc, PM_realloc, PM_useLocalMalloc
+****************************************************************************/
+void PMAPI PM_free(
+    void *p)
+{
+    __PM_free(p);
+}