/*                                                                           */
/*  * Copyright (c) 1989, 1990, 1991 by the University of Washington         */
/*  *                                                                        */
/*  * For copying and distribution information, please see the file          */
/*  * <copyright.h>.                                                         */

#include "pmachine.h"
#include "pfs.h"

static PTEXT	freep = NULL;
int 		ptext_count = 0;
int		ptext_max = 0;

/*                                                                           */
/*  * ptalloc - allocate and initialize ptext structure                      */
/*  *                                                                        */
/*  * PTALLOC returns a pointer to an initialized structure of type          */
/*  * PTEXT.  If it is unable to allocate such a structure, it               */
/*  * returns NULL.                                                          */
PTEXT
ptalloc()
    {
	PTEXT	vt;
	if(freep) {
	    vt = freep;
	    freep = freep->next;
	}
	else {
	    vt = (PTEXT) malloc(sizeof(PTEXT_ST));
	    if (!vt) return(NULL);
	    ptext_max++;
	}
	ptext_count++;

	/* nearly all parts are 0 [or NULL]                                  */
	ZERO(vt);
	/* The offset is to leave room for additional headers                */
	vt->start = vt->dat + MAX_PTXT_HDR;

	return(vt);
    }

/*                                                                           */
/*  * ptfree - free a VTEXT structure                                        */
/*  *                                                                        */
/*  * VTFREE takes a pointer to a VTEXT structure and adds it to             */
/*  * the free list for later reuse.                                         */
void
ptfree(vt)
    PTEXT	vt;
    {
	vt->next = freep;
	vt->previous = NULL;
	freep = vt;
	ptext_count--;
    }

/*                                                                           */
/*  * ptlfree - free a VTEXT structure                                       */
/*  *                                                                        */
/*  * VTLFREE takes a pointer to a VTEXT structure frees it and any linked   */
/*  * VTEXT structures.  It is used to free an entrie list of VTEXT          */
/*  * structures.                                                            */
void
ptlfree(vt)
    PTEXT	vt;
    {
	PTEXT	nxt;

	while(vt != NULL) {
	    nxt = vt->next;
	    ptfree(vt);
	    vt = nxt;
	}
    }