diplodocus.org Git - nmh/blob - sbr/folder_realloc.c

   1 /* folder_realloc.c -- realloc a folder/msgs structure
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9 #include <h/utils.h>
  10
  11 /*
  12  * Reallocate some of the space in the folder
  13  * structure (currently just message status array).
  14  *
  15  * Return pointer to new folder structure.
  16  * If error, return NULL.
  17  */
  18
  19 struct msgs *
  20 folder_realloc (struct msgs *mp, int lo, int hi)
  21 {
  22     struct bvector *tmpstats, *t;
  23     size_t i;
  24     int msgnum;
  25
  26     /* sanity checks */
  27     if (lo < 1)
  28         adios (NULL, "BUG: called folder_realloc with lo (%d) < 1", lo);
  29     if (hi < 1)
  30         adios (NULL, "BUG: called folder_realloc with hi (%d) < 1", hi);
  31     if (mp->nummsg > 0 && lo > mp->lowmsg)
  32         adios (NULL, "BUG: called folder_realloc with lo (%d) > mp->lowmsg (%d)",
  33                lo, mp->lowmsg);
  34     if (mp->nummsg > 0 && hi < mp->hghmsg)
  35         adios (NULL, "BUG: called folder_realloc with hi (%d) < mp->hghmsg (%d)",
  36                hi, mp->hghmsg);
  37
  38     /* Check if we really need to reallocate anything */
  39     if (lo == mp->lowoff && hi == mp->hghoff)
  40         return mp;
  41
  42     /* first allocate the new message status space */
  43     mp->num_msgstats = MSGSTATNUM (lo, hi);
  44     tmpstats = mh_xmalloc (MSGSTATSIZE(mp));
  45     for (i = 0, t = tmpstats; i < mp->num_msgstats; ++i, ++t) {
  46         bvector_init(t);
  47     }
  48
  49     /* then copy messages status array with shift */
  50     if (mp->nummsg > 0) {
  51         for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++)
  52             bvector_copy (tmpstats + msgnum - lo, msgstat (mp, msgnum));
  53     }
  54     free(mp->msgstats);
  55     mp->msgstats = tmpstats;
  56     mp->lowoff = lo;
  57     mp->hghoff = hi;
  58
  59     return mp;
  60 }