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/* folder_realloc.c -- realloc a folder/msgs structure
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include "h/mh.h"
#include "folder_realloc.h"
#include "error.h"
#include "utils.h"
/*
* Reallocate some of the space in the folder
* structure (currently just message status array).
*
* Return pointer to new folder structure.
* If error, return NULL.
*/
struct msgs *
folder_realloc (struct msgs *mp, int lo, int hi)
{
struct bvector *tmpstats, *t;
size_t i;
int msgnum;
/* sanity checks */
if (lo < 1)
die("BUG: called folder_realloc with lo (%d) < 1", lo);
if (hi < 1)
die("BUG: called folder_realloc with hi (%d) < 1", hi);
if (mp->nummsg > 0 && lo > mp->lowmsg)
die("BUG: called folder_realloc with lo (%d) > mp->lowmsg (%d)",
lo, mp->lowmsg);
if (mp->nummsg > 0 && hi < mp->hghmsg)
die("BUG: called folder_realloc with hi (%d) < mp->hghmsg (%d)",
hi, mp->hghmsg);
/* Check if we really need to reallocate anything */
if (lo == mp->lowoff && hi == mp->hghoff)
return mp;
/* first allocate the new message status space */
mp->num_msgstats = MSGSTATNUM (lo, hi);
tmpstats = mh_xmalloc (MSGSTATSIZE(mp));
for (i = 0, t = tmpstats; i < mp->num_msgstats; ++i, ++t) {
bvector_init(t);
}
/* then copy messages status array with shift */
if (mp->nummsg > 0) {
for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++)
bvector_copy (tmpstats + msgnum - lo, msgstat (mp, msgnum));
}
free(mp->msgstats);
mp->msgstats = tmpstats;
mp->lowoff = lo;
mp->hghoff = hi;
return mp;
}
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