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)
  27 {
  28     int msgnum, prefix_len, len, *mi;
  29     struct msgs *mp;
  30     struct stat st;
  31     struct dirent *dp;
  32     DIR *dd;
  33
  34     name = m_mailpath (name);
  35     if (!(dd = opendir (name))) {
  36         free (name);
  37         return NULL;
  38     }
  39
  40     if (stat (name, &st) == -1) {
  41         free (name);
  42         return NULL;
  43     }
  44
  45     /* Allocate the main structure for folder information */
  46     mp = (struct msgs *) mh_xmalloc ((size_t) sizeof(*mp));
  47
  48     clear_folder_flags (mp);
  49     mp->foldpath = name;
  50     mp->lowmsg = 0;
  51     mp->hghmsg = 0;
  52     mp->curmsg = 0;
  53     mp->lowsel = 0;
  54     mp->hghsel = 0;
  55     mp->numsel = 0;
  56     mp->nummsg = 0;
  57
  58     if (access (name, W_OK) == -1)
  59         set_readonly (mp);
  60     prefix_len = strlen(BACKUP_PREFIX);
  61
  62     /*
  63      * Allocate a temporary place to record the
  64      * name of the messages in this folder.
  65      */
  66     len = NUMMSGS;
  67     mi = (int *) mh_xmalloc ((size_t) (len * sizeof(*mi)));
  68
  69     while ((dp = readdir (dd))) {
  70         if ((msgnum = m_atoi (dp->d_name)) && msgnum > 0) {
  71             /*
  72              * Check if we need to allocate more
  73              * temporary elements for message names.
  74              */
  75             if (mp->nummsg >= len) {
  76                 len += NUMMSGS;
  77                 mi = (int *) mh_xrealloc (mi, (size_t) (len * sizeof(*mi)));
  78             }
  79
  80             /* Check if this is the first message we've seen */
  81             if (mp->nummsg == 0) {
  82                 mp->lowmsg = msgnum;
  83                 mp->hghmsg = msgnum;
  84             } else {
  85                 /* Check if this is it the highest or lowest we've seen? */
  86                 if (msgnum < mp->lowmsg)
  87                    mp->lowmsg = msgnum;
  88                 if (msgnum > mp->hghmsg)
  89                    mp->hghmsg = msgnum;
  90             }
  91
  92             /*
  93              * Now increment count, and record message
  94              * number in a temporary place for now.
  95              */
  96             mi[mp->nummsg++] = msgnum;
  97
  98         } else {
  99             switch (dp->d_name[0]) {
 100                 case '.':
 101                 case ',':
 102                     continue;
 103
 104                 default:
 105                     /* skip any files beginning with backup prefix */
 106                     if (!strncmp (dp->d_name, BACKUP_PREFIX, prefix_len))
 107                         continue;
 108
 109                     /* skip the LINK file */
 110                     if (!strcmp (dp->d_name, LINK))
 111                         continue;
 112
 113                     /* indicate that there are other files in folder */
 114                     set_other_files (mp);
 115                     continue;
 116             }
 117         }
 118     }
 119
 120     closedir (dd);
 121     mp->lowoff = max (mp->lowmsg, 1);
 122
 123     /* Go ahead and allocate space for 100 additional messages. */
 124     mp->hghoff = mp->hghmsg + 100;
 125
 126     /* for testing, allocate minimal necessary space */
 127     /* mp->hghoff = max (mp->hghmsg, 1); */
 128
 129     /*
 130      * Allocate space for status of each message.
 131      */
 132     mp->msgstats = mh_xmalloc (MSGSTATSIZE(mp, mp->lowoff, mp->hghoff));
 133
 134     /*
 135      * Clear all the flag bits for all the message
 136      * status entries we just allocated.
 137      */
 138     for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++)
 139         clear_msg_flags (mp, msgnum);
 140
 141     /*
 142      * Scan through the array of messages we've seen and
 143      * setup the initial flags for those messages in the
 144      * newly allocated mp->msgstats area.
 145      */
 146     for (msgnum = 0; msgnum < mp->nummsg; msgnum++)
 147         set_exists (mp, mi[msgnum]);
 148
 149     free (mi);          /* We don't need this anymore    */
 150
 151     /*
 152      * Read and initialize the sequence information.
 153      */
 154     seq_read (mp);
 155
 156     return mp;
 157 }