mempager.cpp

multi-line Adjunct Communication Server

// Copyright (C) 1999-2000 Open Source Telecom Corporation.
//  
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// As a special exception to the GNU General Public License, permission is
// granted for additional uses of the text contained in its release
// of ACS as noted here.
//
// This exception is that permission is hereby granted to link ACS with
// the Pika MonteCarlo static libraries to produce a executable image
// without requiring MonteCarlo itself to be supplied in source form so
// long as each source file so linked contains this exclusion.
//
// This exception does not however invalidate any other reasons why
// the resulting executable file might be covered by the GNU General
// public license or invalidate the licensing requirements of any
// other component or library.
//
// This exception applies only to the code released by OST under the
// name ACS.  If you copy code from other releases into a copy of
// ACS, as the General Public License permits, the exception does not
// apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own to ACS, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice, at which
// point the terms of your modification would be covered under the GPL
// as explicitly stated in "COPYING".

#include <stdlib.h>
#include <string.h>
#include <misc.h>
#include <debug.h>

Mempager::Mempager(int pg)
{
	pagesize = pg;
	pages = 1;
	page = (struct _page *)new char[pagesize];
	page->next = NULL;
	page->used = sizeof(struct _page);
	debug(9, "init page %p", page);
}

Mempager::~Mempager()
{
	struct _page *root = page;

	while(root)
	{
		debug(9, "removing page %p", root);
		page = page->next;
		delete root;
		root = page;
	}
}

void *Mempager::alloc(size_t size)
{
	void	*ptr;
	struct _page *npage;
	if(page->used + size > pagesize)
	{
		npage = (struct _page *) new char[pagesize];		
		npage->next = page;
		npage->used = sizeof(struct _page);
		//page->next = npage;
		page = npage;
		debug(9, "added page %p", npage);
		++pages;
	}
	ptr = (void *)&page->data[page->used - sizeof(struct _page)];
	page->used += size;
	return ptr;
}

char *Mempager::dupstr(char *str)
{
	char *cp = (char *)alloc(strlen(str) + 1);
	strcpy(cp, str);
	return cp;
}