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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 <h/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)
{
int msgnum;
/* sanity checks */
if (lo < 1)
adios (NULL, "BUG: called folder_realloc with lo (%d) < 1", lo);
if (hi < 1)
adios (NULL, "BUG: called folder_realloc with hi (%d) < 1", hi);
if (mp->nummsg > 0 && lo > mp->lowmsg)
adios (NULL, "BUG: called folder_realloc with lo (%d) > mp->lowmsg (%d)",
lo, mp->lowmsg);
if (mp->nummsg > 0 && hi < mp->hghmsg)
adios (NULL, "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;
if (lo == mp->lowoff) {
bvector_t *v;
size_t old_size = mp->num_msgstats;
size_t new_size = hi - lo + 1;
size_t i;
/*
* We are just extending (or shrinking) the end of message
* status array. So we don't have to move anything and can
* just realloc the message status array.
*/
for (i = old_size, v = &mp->msgstats[old_size-1]; i > new_size;
--i, --v) {
bvector_free (*v);
}
mp->num_msgstats = MSGSTATNUM (lo, hi);
mp->msgstats =
mh_xrealloc (mp->msgstats, MSGSTATSIZE(mp));
for (i = old_size, v = &mp->msgstats[old_size]; i < new_size;
++i, ++v) {
*v = bvector_create (0);
}
} else {
/*
* We are changing the offset of the message status
* array. So we will need to shift everything.
*/
bvector_t *tmpstats, *t;
size_t i;
/* 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) {
*t = bvector_create (0);
}
/* 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;
/*
* Clear all the flags for entries outside
* the current message range for this folder.
*/
if (mp->nummsg > 0) {
for (msgnum = mp->lowoff; msgnum < mp->lowmsg; msgnum++)
clear_msg_flags (mp, msgnum);
for (msgnum = mp->hghmsg + 1; msgnum <= mp->hghoff; msgnum++)
clear_msg_flags (mp, msgnum);
} else {
/* no messages, so clear entire range */
for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++)
clear_msg_flags (mp, msgnum);
}
return mp;
}
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