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

   1 /* folder_delmsgs.c -- "remove" SELECTED messages from a folder
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include "h/mh.h"
   9 #include "ext_hook.h"
  10 #include "folder_delmsgs.h"
  11 #include "context_save.h"
  12 #include "arglist.h"
  13 #include "error.h"
  14 #include "h/utils.h"
  15 #include "m_mktemp.h"
  16
  17 /*
  18  * 1) If we are using an external rmmproc, then exec it.
  19  * 2) Else if unlink_msgs is non-zero, then unlink the
  20  *    SELECTED messages.
  21  * 3) Else rename SELECTED messages by prefixing name
  22  *    with a standard prefix.
  23  *
  24  * If there is an error, return -1, else return 0.
  25  */
  26
  27 int
  28 folder_delmsgs (struct msgs *mp, int unlink_msgs, int nohook)
  29 {
  30     pid_t pid;
  31     int msgnum, vecp, retval = 0;
  32     char buf[100], *dp, **vec, *prog;
  33     char        msgpath[BUFSIZ];
  34
  35     /*
  36      * If "rmmproc" is defined, exec it to remove messages.
  37      */
  38     if (rmmproc) {
  39         /* Unset the EXISTS flag for each message to be removed */
  40         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  41             if (is_selected (mp, msgnum))
  42                 unset_exists (mp, msgnum);
  43         }
  44
  45         /* Mark that the sequence information has changed */
  46         mp->msgflags |= SEQMOD;
  47
  48         /*
  49          * Write out the sequence and context files; this will release
  50          * any locks before the rmmproc is called.
  51          */
  52
  53         seq_save (mp);
  54         context_save ();
  55
  56         vec = argsplit(rmmproc, &prog, &vecp);
  57
  58         /*
  59          * argsplit allocates a MAXARGS vector by default,  If we need
  60          * something bigger, allocate it ourselves
  61          */
  62
  63         if (mp->numsel + vecp + 1 > MAXARGS)
  64             vec = mh_xrealloc(vec, (mp->numsel + vecp + 1) * sizeof *vec);
  65         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  66             if (is_selected (mp, msgnum) &&
  67                 !(vec[vecp++] = strdup (m_name (msgnum))))
  68                 die("strdup failed");
  69         }
  70         vec[vecp] = NULL;
  71
  72         fflush (stdout);
  73
  74         switch (pid = fork()) {
  75         case -1:
  76             advise ("fork", "unable to");
  77             return -1;
  78
  79         case 0:
  80             execvp (prog, vec);
  81             fprintf (stderr, "unable to exec ");
  82             perror (rmmproc);
  83             _exit(1);
  84
  85         default:
  86             arglist_free(prog, vec);
  87             return pidwait(pid, -1);
  88         }
  89     }
  90
  91     /*
  92      * Either unlink or rename the SELECTED messages
  93      */
  94     for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  95         if (is_selected (mp, msgnum)) {
  96             /* unselect message */
  97             unset_selected (mp, msgnum);
  98             mp->numsel--;
  99
 100             /*
 101              *  Run the external hook on the message if one was specified in the context.
 102              *  All we have is the message number; we have changed to the directory
 103              *  containing the message.  So, we need to extract that directory to form
 104              *  the complete path.  Note that the caller knows the directory, but has
 105              *  no way of passing that to us.
 106              */
 107
 108             if (!nohook) {
 109                     (void)snprintf(msgpath, sizeof (msgpath), "%s/%d", mp->foldpath, msgnum);
 110                     (void)ext_hook("del-hook", msgpath, NULL);
 111                 }
 112
 113             dp = m_name (msgnum);
 114
 115             if (unlink_msgs) {
 116                 /* just unlink the messages */
 117                 if (m_unlink (dp) == -1) {
 118                     admonish (dp, "unable to unlink");
 119                     retval = -1;
 120                     continue;
 121                 }
 122             } else {
 123                 /* or rename messages with standard prefix */
 124                 strncpy (buf, m_backup (dp), sizeof(buf));
 125                 if (rename (dp, buf) == -1) {
 126                     admonish (buf, "unable to rename %s to", dp);
 127                     retval = -1;
 128                     continue;
 129                 }
 130             }
 131
 132             /* If removal was successful, decrement message count */
 133             unset_exists (mp, msgnum);
 134             mp->nummsg--;
 135         }
 136     }
 137
 138     /* Sanity check */
 139     if (mp->numsel != 0)
 140         die("oops, mp->numsel should be 0");
 141
 142     /* Mark that the sequence information has changed */
 143     mp->msgflags |= SEQMOD;
 144
 145     /*
 146      * Write out sequence and context files
 147      */
 148
 149     seq_save (mp);
 150     context_save ();
 151
 152     return retval;
 153 }