diplodocus.org Git - nmh/blob - sbr/folder_read.c

   1
   2 /*
   3  * folder_read.c -- initialize folder structure and read folder
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11 #include <h/utils.h>
  12
  13 /* We allocate the `mi' array 1024 elements at a time */
  14 #define NUMMSGS  1024
  15
  16 /*
  17  * 1) Create the folder/message structure
  18  * 2) Read the directory (folder) and temporarily
  19  *    record the numbers of the messages we have seen.
  20  * 3) Then allocate the array for message attributes and
  21  *    set the initial flags for all messages we've seen.
  22  * 4) Read and initialize the sequence information.
  23  */
  24
  25 struct msgs *
  26 folder_read (char *name, int lockflag)
  27 {
  28     int msgnum, prefix_len, len, *mi;
  29     struct msgs *mp;
  30     struct dirent *dp;
  31     DIR *dd;
  32     bvector_t *v;
  33     size_t i;
  34
  35     name = m_mailpath (name);
  36     if (!(dd = opendir (name))) {
  37         free (name);
  38         return NULL;
  39     }
  40
  41     /* Allocate the main structure for folder information */
  42     NEW(mp);
  43     clear_folder_flags (mp);
  44     mp->foldpath = name;
  45     mp->lowmsg = 0;
  46     mp->hghmsg = 0;
  47     mp->curmsg = 0;
  48     mp->lowsel = 0;
  49     mp->hghsel = 0;
  50     mp->numsel = 0;
  51     mp->nummsg = 0;
  52     mp->seqhandle = NULL;
  53     mp->seqname = NULL;
  54
  55     if (access (name, W_OK) == -1)
  56         set_readonly (mp);
  57     prefix_len = strlen(BACKUP_PREFIX);
  58
  59     /*
  60      * Allocate a temporary place to record the
  61      * name of the messages in this folder.
  62      */
  63     len = NUMMSGS;
  64     mi = (int *) mh_xmalloc ((size_t) (len * sizeof(*mi)));
  65
  66     while ((dp = readdir (dd))) {
  67         if ((msgnum = m_atoi (dp->d_name)) && msgnum > 0) {
  68             /*
  69              * Check if we need to allocate more
  70              * temporary elements for message names.
  71              */
  72             if (mp->nummsg >= len) {
  73                 len += NUMMSGS;
  74                 mi = (int *) mh_xrealloc (mi, (size_t) (len * sizeof(*mi)));
  75             }
  76
  77             /* Check if this is the first message we've seen */
  78             if (mp->nummsg == 0) {
  79                 mp->lowmsg = msgnum;
  80                 mp->hghmsg = msgnum;
  81             } else {
  82                 /* Check if this is it the highest or lowest we've seen? */
  83                 if (msgnum < mp->lowmsg)
  84                    mp->lowmsg = msgnum;
  85                 if (msgnum > mp->hghmsg)
  86                    mp->hghmsg = msgnum;
  87             }
  88
  89             /*
  90              * Now increment count, and record message
  91              * number in a temporary place for now.
  92              */
  93             mi[mp->nummsg++] = msgnum;
  94
  95         } else {
  96             switch (dp->d_name[0]) {
  97                 case '.':
  98                 case ',':
  99                     continue;
 100
 101                 default:
 102                     /* skip any files beginning with backup prefix */
 103                     if (!strncmp (dp->d_name, BACKUP_PREFIX, prefix_len))
 104                         continue;
 105
 106                     /* skip the LINK file */
 107                     if (!strcmp (dp->d_name, LINK))
 108                         continue;
 109
 110                     /* indicate that there are other files in folder */
 111                     set_other_files (mp);
 112                     continue;
 113             }
 114         }
 115     }
 116
 117     closedir (dd);
 118     mp->lowoff = max (mp->lowmsg, 1);
 119
 120     /* Go ahead and allocate space for 100 additional messages. */
 121     mp->hghoff = mp->hghmsg + 100;
 122
 123     /* for testing, allocate minimal necessary space */
 124     /* mp->hghoff = max (mp->hghmsg, 1); */
 125
 126     /*
 127      * If for some reason hghoff < lowoff (like we got an integer overflow)
 128      * the complain about this now.
 129      */
 130
 131     if (mp->hghoff < mp->lowoff) {
 132         adios(NULL, "Internal failure: high message limit < low message "
 133               "limit; possible overflow?");
 134     }
 135
 136     /*
 137      * Allocate space for status of each message.
 138      */
 139     mp->num_msgstats = MSGSTATNUM (mp->lowoff, mp->hghoff);
 140     mp->msgstats = mh_xmalloc (MSGSTATSIZE(mp));
 141     for (i = 0, v = mp->msgstats; i < mp->num_msgstats; ++i, ++v) {
 142         *v = bvector_create (0);
 143     }
 144
 145     mp->msgattrs = svector_create (0);
 146
 147     /*
 148      * Clear all the flag bits for all the message
 149      * status entries we just allocated.
 150      */
 151     for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++)
 152         clear_msg_flags (mp, msgnum);
 153
 154     /*
 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.
 158      */
 159     for (msgnum = 0; msgnum < mp->nummsg; msgnum++)
 160         set_exists (mp, mi[msgnum]);
 161
 162     free (mi);          /* We don't need this anymore    */
 163
 164     /*
 165      * Read and initialize the sequence information.
 166      */
 167     if (seq_read (mp, lockflag) == NOTOK) {
 168         char seqfile[PATH_MAX];
 169
 170         /* Failed to lock sequence file. */
 171         snprintf (seqfile, sizeof(seqfile), "%s/%s", mp->foldpath, mh_seq);
 172         advise (seqfile, "failed to lock");
 173
 174         return NULL;
 175     }
 176
 177     return mp;
 178 }