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

   1
   2 /*
   3  * folder_delmsgs.c -- "remove" SELECTED messages from a 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
  12 /*
  13  * 1) If we are using an external rmmproc, then exec it.
  14  * 2) Else if unlink_msgs is non-zero, then unlink the
  15  *    SELECTED messages.
  16  * 3) Else rename SELECTED messages by prefixing name
  17  *    with a standard prefix.
  18  *
  19  * If there is an error, return -1, else return 0.
  20  */
  21
  22 int
  23 folder_delmsgs (struct msgs *mp, int unlink_msgs, int nohook)
  24 {
  25     pid_t pid;
  26     int msgnum, vecp, retval = 0;
  27     char buf[100], *dp, **vec, *prog;
  28     char        msgpath[BUFSIZ];
  29
  30     /*
  31      * If "rmmproc" is defined, exec it to remove messages.
  32      */
  33     if (rmmproc) {
  34         /* Unset the EXISTS flag for each message to be removed */
  35         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  36             if (is_selected (mp, msgnum))
  37                 unset_exists (mp, msgnum);
  38         }
  39
  40         /* Mark that the sequence information has changed */
  41         mp->msgflags |= SEQMOD;
  42
  43         /*
  44          * Write out the sequence and context files; this will release
  45          * any locks before the rmmproc is called.
  46          */
  47
  48         seq_save (mp);
  49         context_save ();
  50
  51         vec = argsplit(rmmproc, &prog, &vecp);
  52
  53         /*
  54          * argsplit allocates a MAXARGS vector by default,  If we need
  55          * something bigger, allocate it ourselves
  56          */
  57
  58         if (mp->numsel + vecp + 1 > MAXARGS)
  59             vec = (char **) realloc (vec, (size_t) ((mp->numsel + vecp + 1) *
  60                                                      sizeof(*vec)));
  61         if (vec == NULL)
  62             adios (NULL, "unable to allocate exec vector");
  63         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  64             if (is_selected (mp, msgnum) &&
  65                 !(vec[vecp++] = strdup (m_name (msgnum))))
  66                 adios (NULL, "strdup failed");
  67         }
  68         vec[vecp] = NULL;
  69
  70         fflush (stdout);
  71
  72         switch (pid = fork()) {
  73         case -1:
  74             advise ("fork", "unable to");
  75             return -1;
  76
  77         case 0:
  78             execvp (prog, vec);
  79             fprintf (stderr, "unable to exec ");
  80             perror (rmmproc);
  81             _exit (-1);
  82
  83         default:
  84             arglist_free(prog, vec);
  85             return (pidwait (pid, -1));
  86         }
  87     }
  88
  89     /*
  90      * Either unlink or rename the SELECTED messages
  91      */
  92     for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  93         if (is_selected (mp, msgnum)) {
  94             /* unselect message */
  95             unset_selected (mp, msgnum);
  96             mp->numsel--;
  97
  98             /*
  99              *  Run the external hook on the message if one was specified in the context.
 100              *  All we have is the message number; we have changed to the directory
 101              *  containing the message.  So, we need to extract that directory to form
 102              *  the complete path.  Note that the caller knows the directory, but has
 103              *  no way of passing that to us.
 104              */
 105
 106             if (!nohook) {
 107                     (void)snprintf(msgpath, sizeof (msgpath), "%s/%d", mp->foldpath, msgnum);
 108                     (void)ext_hook("del-hook", msgpath, (char *)0);
 109                 }
 110
 111             dp = m_name (msgnum);
 112
 113             if (unlink_msgs) {
 114                 /* just unlink the messages */
 115                 if (m_unlink (dp) == -1) {
 116                     admonish (dp, "unable to unlink");
 117                     retval = -1;
 118                     continue;
 119                 }
 120             } else {
 121                 /* or rename messages with standard prefix */
 122                 strncpy (buf, m_backup (dp), sizeof(buf));
 123                 if (rename (dp, buf) == -1) {
 124                     admonish (buf, "unable to rename %s to", dp);
 125                     retval = -1;
 126                     continue;
 127                 }
 128             }
 129
 130             /* If removal was successful, decrement message count */
 131             unset_exists (mp, msgnum);
 132             mp->nummsg--;
 133         }
 134     }
 135
 136     /* Sanity check */
 137     if (mp->numsel != 0)
 138         adios (NULL, "oops, mp->numsel should be 0");
 139
 140     /* Mark that the sequence information has changed */
 141     mp->msgflags |= SEQMOD;
 142
 143     /*
 144      * Write out sequence and context files
 145      */
 146
 147     seq_save (mp);
 148     context_save ();
 149
 150     return retval;
 151 }