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
   8 #include <h/mh.h>
   9
  10 /* We allocate the `mi' array 1024 elements at a time */
  11 #define NUMMSGS  1024
  12
  13 /*
  14  * 1) Create the folder/message structure
  15  * 2) Read the directory (folder) and temporarily
  16  *    record the numbers of the messages we have seen.
  17  * 3) Then allocate the array for message attributes and
  18  *    set the initial flags for all messages we've seen.
  19  * 4) Read and initialize the sequence information.
  20  */
  21
  22 struct msgs *
  23 folder_read (char *name)
  24 {
  25     int msgnum, prefix_len, len, *mi;
  26     struct msgs *mp;
  27     struct stat st;
  28     struct dirent *dp;
  29     DIR *dd;
  30
  31     name = m_mailpath (name);
  32     if (!(dd = opendir (name))) {
  33         free (name);
  34         return NULL;
  35     }
  36
  37     if (stat (name, &st) == -1) {
  38         free (name);
  39         return NULL;
  40     }
  41
  42     /* Allocate the main structure for folder information */
  43     if (!(mp = (struct msgs *) malloc ((size_t) sizeof(*mp))))
  44         adios (NULL, "unable to allocate folder storage");
  45
  46     clear_folder_flags (mp);
  47     mp->foldpath = name;
  48     mp->lowmsg = 0;
  49     mp->hghmsg = 0;
  50     mp->curmsg = 0;
  51     mp->lowsel = 0;
  52     mp->hghsel = 0;
  53     mp->numsel = 0;
  54     mp->nummsg = 0;
  55
  56     if (access (name, W_OK) == -1 || st.st_uid != getuid())
  57         set_readonly (mp);
  58     prefix_len = strlen(BACKUP_PREFIX);
  59
  60     /*
  61      * Allocate a temporary place to record the
  62      * name of the messages in this folder.
  63      */
  64     len = NUMMSGS;
  65     if (!(mi = (int *) malloc ((size_t) (len * sizeof(*mi)))))
  66         adios (NULL, "unable to allocate storage");
  67
  68     while ((dp = readdir (dd))) {
  69         if ((msgnum = m_atoi (dp->d_name))) {
  70             /*
  71              * Check if we need to allocate more
  72              * temporary elements for message names.
  73              */
  74             if (mp->nummsg >= len) {
  75                 len += NUMMSGS;
  76                 if (!(mi = (int *) realloc (mi,
  77                         (size_t) (len * sizeof(*mi))))) {
  78                     adios (NULL, "unable to allocate storage");
  79                 }
  80             }
  81
  82             /* Check if this is the first message we've seen */
  83             if (mp->nummsg == 0) {
  84                 mp->lowmsg = msgnum;
  85                 mp->hghmsg = msgnum;
  86             } else {
  87                 /* Check if this is it the highest or lowest we've seen? */
  88                 if (msgnum < mp->lowmsg)
  89                    mp->lowmsg = msgnum;
  90                 if (msgnum > mp->hghmsg)
  91                    mp->hghmsg = msgnum;
  92             }
  93
  94             /*
  95              * Now increment count, and record message
  96              * number in a temporary place for now.
  97              */
  98             mi[mp->nummsg++] = msgnum;
  99
 100         } else {
 101             switch (dp->d_name[0]) {
 102                 case '.':
 103                 case ',':
 104 #ifdef MHE
 105                 case '+':
 106 #endif /* MHE */
 107                     continue;
 108
 109                 default:
 110                     /* skip any files beginning with backup prefix */
 111                     if (!strncmp (dp->d_name, BACKUP_PREFIX, prefix_len))
 112                         continue;
 113
 114                     /* skip the LINK file */
 115                     if (!strcmp (dp->d_name, LINK))
 116                         continue;
 117
 118                     /* indicate that there are other files in folder */
 119                     set_other_files (mp);
 120                     continue;
 121             }
 122         }
 123     }
 124
 125     closedir (dd);
 126     mp->lowoff = max (mp->lowmsg, 1);
 127
 128     /* Go ahead and allocate space for 100 additional messages. */
 129     mp->hghoff = mp->hghmsg + 100;
 130
 131     /* for testing, allocate minimal necessary space */
 132     /* mp->hghoff = max (mp->hghmsg, 1); */
 133
 134     /*
 135      * Allocate space for status of each message.
 136      */
 137     if (!(mp->msgstats = malloc (MSGSTATSIZE(mp, mp->lowoff, mp->hghoff))))
 138         adios (NULL, "unable to allocate storage for msgstats");
 139
 140     /*
 141      * Clear all the flag bits for all the message
 142      * status entries we just allocated.
 143      */
 144     for (msgnum = mp->lowoff; msgnum <= mp->hghoff; msgnum++)
 145         clear_msg_flags (mp, msgnum);
 146
 147     /*
 148      * Scan through the array of messages we've seen and
 149      * setup the initial flags for those messages in the
 150      * newly allocated mp->msgstats area.
 151      */
 152     for (msgnum = 0; msgnum < mp->nummsg; msgnum++)
 153         set_exists (mp, mi[msgnum]);
 154
 155     free (mi);          /* We don't need this anymore    */
 156
 157     /*
 158      * Read and initialize the sequence information.
 159      */
 160     seq_read (mp);
 161
 162     return mp;
 163 }