| 1 | |
|---|
| 2 | /* |
|---|
| 3 | * folder_realloc.c -- realloc a folder/msgs structure |
|---|
| 4 | * |
|---|
| 5 | * $Id: folder_realloc.c,v 1.1.1.1 1999-02-07 18:14:08 danw Exp $ |
|---|
| 6 | */ |
|---|
| 7 | |
|---|
| 8 | #include <h/mh.h> |
|---|
| 9 | |
|---|
| 10 | /* |
|---|
| 11 | * Reallocate some of the space in the folder |
|---|
| 12 | * structure (currently just message status array). |
|---|
| 13 | * |
|---|
| 14 | * Return pointer to new folder structure. |
|---|
| 15 | * If error, return NULL. |
|---|
| 16 | */ |
|---|
| 17 | |
|---|
| 18 | struct msgs * |
|---|
| 19 | folder_realloc (struct msgs *mp, int lo, int hi) |
|---|
| 20 | { |
|---|
| 21 | int msgnum; |
|---|
| 22 | |
|---|
| 23 | /* sanity checks */ |
|---|
| 24 | if (lo < 1) |
|---|
| 25 | adios (NULL, "BUG: called folder_realloc with lo (%d) < 1", lo); |
|---|
| 26 | if (hi < 1) |
|---|
| 27 | adios (NULL, "BUG: called folder_realloc with hi (%d) < 1", hi); |
|---|
| 28 | if (mp->nummsg > 0 && lo > mp->lowmsg) |
|---|
| 29 | adios (NULL, "BUG: called folder_realloc with lo (%d) > mp->lowmsg (%d)", |
|---|
| 30 | lo, mp->lowmsg); |
|---|
| 31 | if (mp->nummsg > 0 && hi < mp->hghmsg) |
|---|
| 32 | adios (NULL, "BUG: called folder_realloc with hi (%d) < mp->hghmsg (%d)", |
|---|
| 33 | hi, mp->hghmsg); |
|---|
| 34 | |
|---|
| 35 | /* Check if we really need to reallocate anything */ |
|---|
| 36 | if (lo == mp->lowoff && hi == mp->hghoff) |
|---|
| 37 | return mp; |
|---|
| 38 | |
|---|
| 39 | if (lo == mp->lowoff) { |
|---|
| 40 | /* |
|---|
| 41 | * We are just extending (or shrinking) the end of message |
|---|
| 42 | * status array. So we don't have to move anything and can |
|---|
| 43 | * just realloc the message status array. |
|---|
| 44 | */ |
|---|
| 45 | if (!(mp->msgstats = realloc (mp->msgstats, MSGSTATSIZE(mp, lo, hi)))) { |
|---|
| 46 | advise (NULL, "unable to reallocate message storage"); |
|---|
| 47 | return NULL; |
|---|
| 48 | } |
|---|
| 49 | } else { |
|---|
| 50 | /* |
|---|
| 51 | * We are changing the offset of the message status |
|---|
| 52 | * array. So we will need to shift everything. |
|---|
| 53 | */ |
|---|
| 54 | seqset_t *tmpstats; |
|---|
| 55 | |
|---|
| 56 | /* first allocate the new message status space */ |
|---|
| 57 | if (!(tmpstats = malloc (MSGSTATSIZE(mp, lo, hi)))) { |
|---|
| 58 | advise (NULL, "unable to reallocate message storage"); |
|---|
| 59 | return NULL; |
|---|
| 60 | } |
|---|
| 61 | |
|---|
| 62 | /* then copy messages status array with shift */ |
|---|
| 63 | if (mp->nummsg > 0) { |
|---|
| 64 | for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++) |
|---|
| 65 | tmpstats[msgnum - lo] = mp->msgstats[msgnum - mp->lowoff]; |
|---|
| 66 | } |
|---|
| 67 | free(mp->msgstats); |
|---|
| 68 | mp->msgstats = tmpstats; |
|---|
| 69 | } |
|---|
| 70 | |
|---|
| 71 | mp->lowoff = lo; |
|---|
| 72 | mp->hghoff = hi; |
|---|
| 73 | |
|---|
| 74 | /* |
|---|
| 75 | * Clear all the flags for entries outside |
|---|
| 76 | * the current message range for this folder. |
|---|
| 77 | */ |
|---|
| 78 | if (mp->nummsg > 0) { |
|---|
| 79 | for (msgnum = mp->lowoff; msgnum < mp->lowmsg; msgnum++) |
|---|
| 80 | clear_msg_flags (mp, msgnum); |
|---|
| 81 | for (msgnum = mp->hghmsg + 1; msgnum <= mp->hghoff; msgnum++) |
|---|
| 82 | clear_msg_flags (mp, msgnum); |
|---|
| 83 | } else { |
|---|
| 84 | /* no messages, so clear entire range */ |
|---|
| 85 | for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++) |
|---|
| 86 | clear_msg_flags (mp, msgnum); |
|---|
| 87 | } |
|---|
| 88 | |
|---|
| 89 | return mp; |
|---|
| 90 | } |
|---|
