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

   1
   2 /*
   3  * folder_read.c -- initialize folder structure and read folder
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13
  14 /* We allocate the `mi' array 1024 elements at a time */
  15 #define NUMMSGS  1024
  16
  17 /*
  18  * 1) Create the folder/message structure
  19  * 2) Read the directory (folder) and temporarily
  20  *    record the numbers of the messages we have seen.
  21  * 3) Then allocate the array for message attributes and
  22  *    set the initial flags for all messages we've seen.
  23  * 4) Read and initialize the sequence information.
  24  */
  25
  26 struct msgs *
  27 folder_read (char *name)
  28 {
  29     int msgnum, prefix_len, len, *mi;
  30     struct msgs *mp;
  31     struct stat st;
  32     struct dirent *dp;
  33     DIR *dd;
  34
  35     name = m_mailpath (name);
  36     if (!(dd = opendir (name))) {
  37         free (name);
  38         return NULL;
  39     }
  40
  41     if (stat (name, &st) == -1) {
  42         free (name);
  43         return NULL;
  44     }
  45
  46     /* Allocate the main structure for folder information */
  47     if (!(mp = (struct msgs *) malloc ((size_t) sizeof(*mp))))
  48         adios (NULL, "unable to allocate folder storage");
  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
  60     if (access (name, W_OK) == -1)
  61         set_readonly (mp);
  62     prefix_len = strlen(BACKUP_PREFIX);
  63
  64     /*
  65      * Allocate a temporary place to record the
  66      * name of the messages in this folder.
  67      */
  68     len = NUMMSGS;
  69     if (!(mi = (int *) malloc ((size_t) (len * sizeof(*mi)))))
  70         adios (NULL, "unable to allocate storage");
  71
  72     while ((dp = readdir (dd))) {
  73         if ((msgnum = m_atoi (dp->d_name)) && msgnum > 0) {
  74             /*
  75              * Check if we need to allocate more
  76              * temporary elements for message names.
  77              */
  78             if (mp->nummsg >= len) {
  79                 len += NUMMSGS;
  80                 if (!(mi = (int *) realloc (mi,
  81                         (size_t) (len * sizeof(*mi))))) {
  82                     adios (NULL, "unable to allocate storage");
  83                 }
  84             }
  85
  86             /* Check if this is the first message we've seen */
  87             if (mp->nummsg == 0) {
  88                 mp->lowmsg = msgnum;
  89                 mp->hghmsg = msgnum;
  90             } else {
  91                 /* Check if this is it the highest or lowest we've seen? */
  92                 if (msgnum < mp->lowmsg)
  93                    mp->lowmsg = msgnum;
  94                 if (msgnum > mp->hghmsg)
  95                    mp->hghmsg = msgnum;
  96             }
  97
  98             /*
  99              * Now increment count, and record message
 100              * number in a temporary place for now.
 101              */
 102             mi[mp->nummsg++] = msgnum;
 103
 104         } else {
 105             switch (dp->d_name[0]) {
 106                 case '.':
 107                 case ',':
 108 #ifdef MHE
 109                 case '+':
 110 #endif /* MHE */
 111                     continue;
 112
 113                 default:
 114                     /* skip any files beginning with backup prefix */
 115                     if (!strncmp (dp->d_name, BACKUP_PREFIX, prefix_len))
 116                         continue;
 117
 118                     /* skip the LINK file */
 119                     if (!strcmp (dp->d_name, LINK))
 120                         continue;
 121
 122                     /* indicate that there are other files in folder */
 123                     set_other_files (mp);
 124                     continue;
 125             }
 126         }
 127     }
 128
 129     closedir (dd);
 130     mp->lowoff = max (mp->lowmsg, 1);
 131
 132     /* Go ahead and allocate space for 100 additional messages. */
 133     mp->hghoff = mp->hghmsg + 100;
 134
 135     /* for testing, allocate minimal necessary space */
 136     /* mp->hghoff = max (mp->hghmsg, 1); */
 137
 138     /*
 139      * Allocate space for status of each message.
 140      */
 141     if (!(mp->msgstats = malloc (MSGSTATSIZE(mp, mp->lowoff, mp->hghoff))))
 142         adios (NULL, "unable to allocate storage for msgstats");
 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);
 165
 166     return mp;
 167 }