2 ** folder_read.c -- initialize folder structure and read folder
4 ** This code is Copyright (c) 2002, by the authors of nmh. See the
5 ** COPYRIGHT file in the root directory of the nmh distribution for
6 ** complete copyright information.
12 /* We allocate the `mi' array 1024 elements at a time */
16 ** 1) Create the folder/message structure
17 ** 2) Read the directory (folder) and temporarily
18 ** record the numbers of the messages we have seen.
19 ** 3) Then allocate the array for message attributes and
20 ** set the initial flags for all messages we've seen.
21 ** 4) Read and initialize the sequence information.
25 folder_read(char *name)
27 int msgnum, prefix_len, len, *mi;
33 name = getcpy(toabsdir(name));
34 if (!(dd = opendir(name))) {
39 if (stat(name, &st) == -1) {
45 /* Allocate the main structure for folder information */
46 mp = (struct msgs *) mh_xmalloc((size_t) sizeof(*mp));
48 clear_folder_flags(mp);
58 if (access(name, W_OK) == -1)
60 prefix_len = strlen(backup_prefix);
63 ** Allocate a temporary place to record the
64 ** name of the messages in this folder.
67 mi = (int *) mh_xmalloc((size_t) (len * sizeof(*mi)));
69 while ((dp = readdir(dd))) {
70 if ((msgnum = m_atoi(dp->d_name)) && msgnum > 0) {
72 ** Check if we need to allocate more
73 ** temporary elements for message names.
75 if (mp->nummsg >= len) {
77 mi = (int *) mh_xrealloc(mi, (size_t) (len * sizeof(*mi)));
80 /* Check if this is the first message we've seen */
81 if (mp->nummsg == 0) {
86 ** Check if this is it the highest or
89 if (msgnum < mp->lowmsg)
91 if (msgnum > mp->hghmsg)
96 ** Now increment count, and record message
97 ** number in a temporary place for now.
99 mi[mp->nummsg++] = msgnum;
102 switch (dp->d_name[0]) {
112 ** skip any files beginning with
115 if (strncmp(dp->d_name, backup_prefix,
119 /* skip the altmsg link file */
120 if (strcmp(dp->d_name, altmsglink)==0)
124 ** indicate that there are other
134 mp->lowoff = max(mp->lowmsg, 1);
136 /* Go ahead and allocate space for 100 additional messages. */
137 mp->hghoff = mp->hghmsg + 100;
139 /* for testing, allocate minimal necessary space */
140 /* mp->hghoff = max(mp->hghmsg, 1); */
142 /* Allocate space for status of each message. */
144 mp->msgstats = mh_xmalloc(MSGSTATSIZE(mp, mp->lowoff, mp->hghoff));
147 ** Clear all the flag bits for all the message
148 ** status entries we just allocated.
149 ** TODO: use memset() ?
151 for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++)
152 clear_msg_flags(mp, msgnum);
155 ** Scan through the array of messages we've seen and
156 ** setup the initial flags for those messages in the
157 ** newly allocated mp->msgstats area.
159 for (msgnum = 0; msgnum < mp->nummsg; msgnum++)
160 set_exists(mp, mi[msgnum]);
162 free(mi); /* We don't need this anymore */
165 ** Read and initialize the sequence information.