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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 <sysexits.h>
#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(EX_SOFTWARE, NULL, "BUG: called folder_realloc with lo (%d) < 1", lo);
if (hi < 1)
adios(EX_SOFTWARE, NULL, "BUG: called folder_realloc with hi (%d) < 1", hi);
if (mp->nummsg > 0 && lo > mp->lowmsg)
adios(EX_SOFTWARE, NULL, "BUG: called folder_realloc with lo (%d) > mp->lowmsg (%d)",
lo, mp->lowmsg);
if (mp->nummsg > 0 && hi < mp->hghmsg)
adios(EX_SOFTWARE, 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) {
/*
** 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.
*/
mp->msgstats = mh_xrealloc(mp->msgstats, MSGSTATSIZE(mp, lo, hi));
} else {
/*
** We are changing the offset of the message status
** array. So we will need to shift everything.
*/
seqset_t *tmpstats;
/* first allocate the new message status space */
tmpstats = mh_xcalloc(MSGSTATSIZE(mp, lo, hi), 1);
/* then copy messages status array with shift */
if (mp->nummsg > 0) {
for (msgnum=mp->lowmsg; msgnum<=mp->hghmsg; msgnum++) {
tmpstats[msgnum - lo] = mp->msgstats[msgnum - mp->lowoff];
}
}
mh_free0(&(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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