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 "seq_save.h"
  10 #include "m_backup.h"
  11 #include "ext_hook.h"
  12 #include "folder_delmsgs.h"
  13 #include "context_save.h"
  14 #include "arglist.h"
  15 #include "error.h"
  16 #include "h/utils.h"
  17 #include "m_mktemp.h"
  18
  19 /*
  20  * 1) If we are using an external rmmproc, then exec it.
  21  * 2) Else if unlink_msgs is non-zero, then unlink the
  22  *    SELECTED messages.
  23  * 3) Else rename SELECTED messages by prefixing name
  24  *    with a standard prefix.
  25  *
  26  * If there is an error, return -1, else return 0.
  27  */
  28
  29 int
  30 folder_delmsgs (struct msgs *mp, int unlink_msgs, int nohook)
  31 {
  32     pid_t pid;
  33     int msgnum, vecp, retval = 0;
  34     char buf[100], *dp, **vec, *prog;
  35     char        msgpath[BUFSIZ];
  36
  37     /*
  38      * If "rmmproc" is defined, exec it to remove messages.
  39      */
  40     if (rmmproc) {
  41         /* Unset the EXISTS flag for each message to be removed */
  42         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  43             if (is_selected (mp, msgnum))
  44                 unset_exists (mp, msgnum);
  45         }
  46
  47         /* Mark that the sequence information has changed */
  48         mp->msgflags |= SEQMOD;
  49
  50         /*
  51          * Write out the sequence and context files; this will release
  52          * any locks before the rmmproc is called.
  53          */
  54
  55         seq_save (mp);
  56         context_save ();
  57
  58         vec = argsplit(rmmproc, &prog, &vecp);
  59
  60         /*
  61          * argsplit allocates a MAXARGS vector by default,  If we need
  62          * something bigger, allocate it ourselves
  63          */
  64
  65         if (mp->numsel + vecp + 1 > MAXARGS)
  66             vec = mh_xrealloc(vec, (mp->numsel + vecp + 1) * sizeof *vec);
  67         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  68             if (is_selected (mp, msgnum) &&
  69                 !(vec[vecp++] = strdup (m_name (msgnum))))
  70                 die("strdup failed");
  71         }
  72         vec[vecp] = NULL;
  73
  74         fflush (stdout);
  75
  76         switch (pid = fork()) {
  77         case -1:
  78             advise ("fork", "unable to");
  79             return -1;
  80
  81         case 0:
  82             execvp (prog, vec);
  83             fprintf (stderr, "unable to exec ");
  84             perror (rmmproc);
  85             _exit(1);
  86
  87         default:
  88             arglist_free(prog, vec);
  89             return pidwait(pid, -1);
  90         }
  91     }
  92
  93     /*
  94      * Either unlink or rename the SELECTED messages
  95      */
  96     for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
  97         if (is_selected (mp, msgnum)) {
  98             /* unselect message */
  99             unset_selected (mp, msgnum);
 100             mp->numsel--;
 101
 102             /*
 103              *  Run the external hook on the message if one was specified in the context.
 104              *  All we have is the message number; we have changed to the directory
 105              *  containing the message.  So, we need to extract that directory to form
 106              *  the complete path.  Note that the caller knows the directory, but has
 107              *  no way of passing that to us.
 108              */
 109
 110             if (!nohook) {
 111                     (void)snprintf(msgpath, sizeof (msgpath), "%s/%d", mp->foldpath, msgnum);
 112                     (void)ext_hook("del-hook", msgpath, NULL);
 113                 }
 114
 115             dp = m_name (msgnum);
 116
 117             if (unlink_msgs) {
 118                 /* just unlink the messages */
 119                 if (m_unlink (dp) == -1) {
 120                     admonish (dp, "unable to unlink");
 121                     retval = -1;
 122                     continue;
 123                 }
 124             } else {
 125                 /* or rename messages with standard prefix */
 126                 strncpy (buf, m_backup (dp), sizeof(buf));
 127                 if (rename (dp, buf) == -1) {
 128                     admonish (buf, "unable to rename %s to", dp);
 129                     retval = -1;
 130                     continue;
 131                 }
 132             }
 133
 134             /* If removal was successful, decrement message count */
 135             unset_exists (mp, msgnum);
 136             mp->nummsg--;
 137         }
 138     }
 139
 140     /* Sanity check */
 141     if (mp->numsel != 0)
 142         die("oops, mp->numsel should be 0");
 143
 144     /* Mark that the sequence information has changed */
 145     mp->msgflags |= SEQMOD;
 146
 147     /*
 148      * Write out sequence and context files
 149      */
 150
 151     seq_save (mp);
 152     context_save ();
 153
 154     return retval;
 155 }