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 stat st;
  31     struct dirent *dp;
  32     DIR *dd;
  33     bvector_t *v;
  34     size_t i;
  35
  36     name = m_mailpath (name);
  37     if (!(dd = opendir (name))) {
  38         free (name);
  39         return NULL;
  40     }
  41
  42     if (stat (name, &st) == -1) {
  43         free (name);
  44         return NULL;
  45     }
  46
  47     /* Allocate the main structure for folder information */
  48     mp = (struct msgs *) mh_xmalloc ((size_t) sizeof(*mp));
  49
  50     clear_folder_flags (mp);
  51     mp->foldpath = name;
  52     mp->lowmsg = 0;
  53     mp->hghmsg = 0;
  54     mp->curmsg = 0;
  55     mp->lowsel = 0;
  56     mp->hghsel = 0;
  57     mp->numsel = 0;
  58     mp->nummsg = 0;
  59     mp->seqhandle = NULL;
  60     mp->seqname = NULL;
  61
  62     if (access (name, W_OK) == -1)
  63         set_readonly (mp);
  64     prefix_len = strlen(BACKUP_PREFIX);
  65
  66     /*
  67      * Allocate a temporary place to record the
  68      * name of the messages in this folder.
  69      */
  70     len = NUMMSGS;
  71     mi = (int *) mh_xmalloc ((size_t) (len * sizeof(*mi)));
  72
  73     while ((dp = readdir (dd))) {
  74         if ((msgnum = m_atoi (dp->d_name)) && msgnum > 0) {
  75             /*
  76              * Check if we need to allocate more
  77              * temporary elements for message names.
  78              */
  79             if (mp->nummsg >= len) {
  80                 len += NUMMSGS;
  81                 mi = (int *) mh_xrealloc (mi, (size_t) (len * sizeof(*mi)));
  82             }
  83
  84             /* Check if this is the first message we've seen */
  85             if (mp->nummsg == 0) {
  86                 mp->lowmsg = msgnum;
  87                 mp->hghmsg = msgnum;
  88             } else {
  89                 /* Check if this is it the highest or lowest we've seen? */
  90                 if (msgnum < mp->lowmsg)
  91                    mp->lowmsg = msgnum;
  92                 if (msgnum > mp->hghmsg)
  93                    mp->hghmsg = msgnum;
  94             }
  95
  96             /*
  97              * Now increment count, and record message
  98              * number in a temporary place for now.
  99              */
 100             mi[mp->nummsg++] = msgnum;
 101
 102         } else {
 103             switch (dp->d_name[0]) {
 104                 case '.':
 105                 case ',':
 106                     continue;
 107
 108                 default:
 109                     /* skip any files beginning with backup prefix */
 110                     if (!strncmp (dp->d_name, BACKUP_PREFIX, prefix_len))
 111                         continue;
 112
 113                     /* skip the LINK file */
 114                     if (!strcmp (dp->d_name, LINK))
 115                         continue;
 116
 117                     /* indicate that there are other files in folder */
 118                     set_other_files (mp);
 119                     continue;
 120             }
 121         }
 122     }
 123
 124     closedir (dd);
 125     mp->lowoff = max (mp->lowmsg, 1);
 126
 127     /* Go ahead and allocate space for 100 additional messages. */
 128     mp->hghoff = mp->hghmsg + 100;
 129
 130     /* for testing, allocate minimal necessary space */
 131     /* mp->hghoff = max (mp->hghmsg, 1); */
 132
 133     /*
 134      * Allocate space for status of each message.
 135      */
 136     mp->num_msgstats = MSGSTATNUM (mp->lowoff, mp->hghoff);
 137     mp->msgstats = mh_xmalloc (MSGSTATSIZE(mp));
 138     for (i = 0, v = mp->msgstats; i < mp->num_msgstats; ++i, ++v) {
 139         *v = bvector_create (0);
 140     }
 141
 142     mp->msgattrs = svector_create (0);
 143
 144     /*
 145      * Clear all the flag bits for all the message
 146      * status entries we just allocated.
 147      */
 148     for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++)
 149         clear_msg_flags (mp, msgnum);
 150
 151     /*
 152      * Scan through the array of messages we've seen and
 153      * setup the initial flags for those messages in the
 154      * newly allocated mp->msgstats area.
 155      */
 156     for (msgnum = 0; msgnum < mp->nummsg; msgnum++)
 157         set_exists (mp, mi[msgnum]);
 158
 159     free (mi);          /* We don't need this anymore    */
 160
 161     /*
 162      * Read and initialize the sequence information.
 163      */
 164     seq_read (mp, lockflag);
 165
 166     return mp;
 167 }