/*
 * TRAIL utilities.  The only notable thing here is that we keep our
 *  own freelist instead of depending on malloc/free for that.
 */

#include <stdlib.h>

#include "structs.h"

#include "trail.h"

static TRAIL *freelist = 0;

TRAIL *newtrail(void)
{
 TRAIL *t;

 t = freelist;
 if (t)
  { freelist = t->link;
    return(t);
  }
 return(malloc(sizeof(TRAIL)));
}

void freetrail(TRAIL *t)
{
 t->link = freelist;
 freelist = t;
}

#if 0
void freetrail_all(TRAIL *t)
{
 TRAIL *tt;

 if (t == 0)
  { return;
  }
 for (tt=t;tt->link;tt=tt->link) ;
 tt->link = freelist;
 freelist = t;
}
#endif