BSD 4_3_Net_2 development

[unix-history] / usr / src / contrib / isode / psap / pe_pullup.c

/* pe_pullup.c - "pullup" a presentation element */

#ifndef lint
static char *rcsid = "$Header: /f/osi/psap/RCS/pe_pullup.c,v 7.1 91/02/22 09:36:16 mrose Interim $";
#endif

/* 
* $Header: /f/osi/psap/RCS/pe_pullup.c,v 7.1 91/02/22 09:36:16 mrose Interim $
*
*
* $Log:        pe_pullup.c,v $
* Revision 7.1  91/02/22  09:36:16  mrose
* Interim 6.8
* 
* Revision 7.0  89/11/23  22:13:06  mrose
* Release 6.0
* 
*/

/*
*                                NOTICE
*
*    Acquisition, use, and distribution of this module and related
*    materials are subject to the restrictions of a license agreement.
*    Consult the Preface in the User's Manual for the full terms of
*    this agreement.
*
*/


/* LINTLIBRARY */

#include <stdio.h>
#include "psap.h"


PElementData    pe_pullup_aux ();

/* \f */

int     pe_pullup (pe)
register PE     pe;
{
   PElementLen     len;
   register PElementData dp;
   register PE     p;

   if (pe -> pe_form != PE_FORM_CONS)
       return OK;

   if ((dp = pe_pullup_aux (pe, &len)) == NULLPED)
       return NOTOK;

   for (p = pe -> pe_cons; p; p = p -> pe_next)
       pe_free (p);

   pe -> pe_form = PE_FORM_PRIM;
   pe -> pe_len = len;
   pe -> pe_prim = dp;

   return OK;
}

/* \f */

static PElementData  pe_pullup_aux (pe, len)
register PE     pe;
register int   *len;
{
   register int    i,
                   k;
   int     j;
   register PElementClass class;
   register PElementID id;
   register PElementData dp,
                         ep,
                         fp;
   register PE     p;

   switch (pe -> pe_form) {
       case PE_FORM_PRIM: 
           if ((dp = PEDalloc (i = pe -> pe_len)) == NULLPED)
               return NULLPED;
           PEDcpy (pe -> pe_prim, dp, i);
           break;

       case PE_FORM_CONS: 
           dp = NULLPED, i = 0;
           class = pe -> pe_class, id = pe -> pe_id;
           for (p = pe -> pe_cons; p; p = p -> pe_next) {
               if (p -> pe_class != class
                       || p -> pe_id != id
                       || (ep = pe_pullup_aux (p, &j)) == NULLPED) {
                   if (dp)
                       PEDfree (dp);
                   return NULLPED;
               }
               if (dp) {
                   if ((fp = PEDrealloc (dp, k = i + j)) == NULLPED) {
                       PEDfree (dp);
                       return NULLPED;
                   }
                   PEDcpy (ep, fp + i, j);
                   dp = fp, i = k;
               }
               else
                   dp = ep, i += j;
           }
           break;

       case PE_FORM_ICONS:
           return NULLPED;
   }

   *len = i;
   return (dp);
}