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 "folder_realloc.h"
  10 #include "error.h"
  11 #include "h/utils.h"
  12
  13 /*
  14  * Reallocate some of the space in the folder
  15  * structure (currently just message status array).
  16  *
  17  * Return pointer to new folder structure.
  18  * If error, return NULL.
  19  */
  20
  21 struct msgs *
  22 folder_realloc (struct msgs *mp, int lo, int hi)
  23 {
  24     struct bvector *tmpstats, *t;
  25     size_t i;
  26     int msgnum;
  27
  28     /* sanity checks */
  29     if (lo < 1)
  30         die("BUG: called folder_realloc with lo (%d) < 1", lo);
  31     if (hi < 1)
  32         die("BUG: called folder_realloc with hi (%d) < 1", hi);
  33     if (mp->nummsg > 0 && lo > mp->lowmsg)
  34         die("BUG: called folder_realloc with lo (%d) > mp->lowmsg (%d)",
  35                lo, mp->lowmsg);
  36     if (mp->nummsg > 0 && hi < mp->hghmsg)
  37         die("BUG: called folder_realloc with hi (%d) < mp->hghmsg (%d)",
  38                hi, mp->hghmsg);
  39
  40     /* Check if we really need to reallocate anything */
  41     if (lo == mp->lowoff && hi == mp->hghoff)
  42         return mp;
  43
  44     /* first allocate the new message status space */
  45     mp->num_msgstats = MSGSTATNUM (lo, hi);
  46     tmpstats = mh_xmalloc (MSGSTATSIZE(mp));
  47     for (i = 0, t = tmpstats; i < mp->num_msgstats; ++i, ++t) {
  48         bvector_init(t);
  49     }
  50
  51     /* then copy messages status array with shift */
  52     if (mp->nummsg > 0) {
  53         for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++)
  54             bvector_copy (tmpstats + msgnum - lo, msgstat (mp, msgnum));
  55     }
  56     free(mp->msgstats);
  57     mp->msgstats = tmpstats;
  58     mp->lowoff = lo;
  59     mp->hghoff = hi;
  60
  61     return mp;
  62 }