1/* free.c
2   Free a buffer from within a memory block.
3
4   Copyright (C) 1992 Ian Lance Taylor
5
6   This file is part of the Taylor UUCP uuconf library.
7
8   This library is free software; you can redistribute it and/or
9   modify it under the terms of the GNU Library General Public License
10   as published by the Free Software Foundation; either version 2 of
11   the License, or (at your option) any later version.
12
13   This library is distributed in the hope that it will be useful, but
14   WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16   Library General Public License for more details.
17
18   You should have received a copy of the GNU Library General Public
19   License along with this library; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
21
22   The author of the program may be contacted at ian@airs.com.
23   */
24
25#include "uucnfi.h"
26
27#if USE_RCS_ID
28const char _uuconf_free_rcsid[] = "$Id: free.c,v 1.7 2002/03/05 19:10:42 ian Rel $";
29#endif
30
31#include "alloc.h"
32
33/* Free memory allocated by uuconf_malloc.  If the memory block is
34   NULL, this just calls free; this is convenient for a number of
35   routines.  Otherwise, this will only do something if this was the
36   last buffer allocated for one of the memory blocks in the list; in
37   other cases, the memory is lost until the entire memory block is
38   freed.  */
39
40#if UUCONF_ANSI_C
41void
42#endif
43uuconf_free (pblock, pbuf)
44     pointer pblock;
45     pointer pbuf;
46{
47  struct sblock *q = (struct sblock *) pblock;
48
49  if (pbuf == NULL)
50    return;
51
52  if (q == NULL)
53    {
54      free (pbuf);
55      return;
56    }
57
58  for (; q != NULL; q = q->qnext)
59    {
60      if (q->plast == pbuf)
61	{
62	  q->ifree = (char *) pbuf - q->u.ab;
63	  /* We could reset q->plast here, but it doesn't matter.  */
64	  return;
65	}
66    }
67}
68