BI_UpdateBuffs.c

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#include "Bdef.h"
 
void BI_UpdateBuffs(BLACBUFF *Newbp)
{
   Int BI_BuffIsFree(BLACBUFF *, Int);
   BLACBUFF *bp, *bp2;
   extern BLACBUFF *BI_ReadyB, *BI_ActiveQ;
 
   if (Newbp)
   {
      if (BI_ActiveQ == NULL) BI_ActiveQ = Newbp->prev = Newbp;
      else
      {
         BI_ActiveQ->prev->next = Newbp;
         Newbp->prev = BI_ActiveQ->prev;
         BI_ActiveQ->prev = Newbp;
      }
      Newbp->next = NULL;
      if (Newbp == BI_ReadyB) BI_ReadyB = NULL;
   }
/*
 * See if any active buffers are ready for reuse.
 */
   for (bp=BI_ActiveQ; bp != NULL; bp = bp2)
   {
      bp2 = bp->next;
      if ( BI_BuffIsFree(bp, 0) )  /* if all of buff's Aops are done */
      {
/*
 *       Remove bp from BI_ActiveQ -- update pointers
 */
         if (bp->next) bp->next->prev = bp->prev;
         else BI_ActiveQ->prev = bp->prev;
         if (bp != BI_ActiveQ) bp->prev->next = bp->next;
         else BI_ActiveQ = BI_ActiveQ->next;
 
/*
 *       If no ready buffer, inactive buff becomes ready
 */
         if (BI_ReadyB == NULL) BI_ReadyB = bp;
/*
 *       If inactive buff bigger than present ready buff, release ready,
 *       and inactive buff becomes ready
 */
         else if (BI_ReadyB->Len < bp->Len)
         {
            free(BI_ReadyB);
            BI_ReadyB = bp;
         }
/*
 *       If ready buffer exists and is bigger than inactive buff,
 *       free inactive buff
 */
         else free(bp);
      }
   }
}  /* end BI_UpdateBuffs */