eudora-mac/CrispinIMAP/fs_mac.c

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#define FILE_NUM 109
/*
 * Program:	Free storage management routines
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: MRC@CAC.Washington.EDU
 *
 * Date:	1 August 1988
 * Last Edited:	15 June 1995
 *
 * Copyright 1995 by the University of Washington
 *
 *  Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appears in all copies and that both the
 * above copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the University of Washington not be
 * used in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  This software is made available
 * "as is", and
 * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
 * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
 * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
 * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

/* Get a block of free storage
 * Accepts: size of desired block
 * Returns: free storage block
 *
 */

void *fs_get (size_t size)
{
	OSErr err = noErr;
	void *block = 0;
	
	block = NuPtrClear (size ? size : (size_t) 1);
			
	if (!block || (err = MemError())) 
	{
		WarnUser(MEM_ERR,MemError()); 
		block = NIL;
	}

	return (block);
}


/* Resize a block of free storage
 * Accepts: ** pointer to current block
 *	    new size
 */

void fs_resize (void **block,size_t size)
{
	OSErr err = noErr;
	
	SetPtrSize(*block,size ? size : (size_t) 1);
	
	if (!block || (err = MemError())) 
	{
		WarnUser(MEM_ERR,MemError()); 
		block = NIL;
	}
}


/* Return a block of free storage
 * Accepts: ** pointer to free storage block
 */

void fs_give (void **block)
{
	if (*block) DisposePtr(*block);
	*block = 0;
}