X-Git-Url: http://git.madism.org/?a=blobdiff_plain;f=muttlib.c;h=7c0177032f3157ac3e2fa7473e29f7bbafdeacfd;hb=42cc85de46ed8971a6c793835023cf26766fb096;hp=234efd2199e67c4330e21110b7f7967cb99b6f7c;hpb=96d53ff49c308769efbf708e1e65819077cb7af6;p=apps%2Fmadmutt.git

diff --git a/muttlib.c b/muttlib.c
index 234efd2..7c01770 100644
--- a/muttlib.c
+++ b/muttlib.c
@@ -637,6 +637,50 @@ void mutt_free_envelope (ENVELOPE ** p)
   FREE (p);
 }
 
+/* move all the headers from extra not present in base into base */
+void mutt_merge_envelopes(ENVELOPE* base, ENVELOPE** extra)
+{
+  /* copies each existing element if necessary, and sets the element
+  * to NULL in the source so that mutt_free_envelope doesn't leave us
+  * with dangling pointers. */
+#define MOVE_ELEM(h) if (!base->h) { base->h = (*extra)->h; (*extra)->h = NULL; }
+  MOVE_ELEM(return_path);
+  MOVE_ELEM(from);
+  MOVE_ELEM(to);
+  MOVE_ELEM(cc);
+  MOVE_ELEM(bcc);
+  MOVE_ELEM(sender);
+  MOVE_ELEM(reply_to);
+  MOVE_ELEM(mail_followup_to);
+  MOVE_ELEM(list_post);
+  MOVE_ELEM(message_id);
+  MOVE_ELEM(supersedes);
+  MOVE_ELEM(date);
+  MOVE_ELEM(x_label);
+  if (!base->refs_changed) {
+    MOVE_ELEM(references);
+  }
+  if (!base->irt_changed) {
+    MOVE_ELEM(in_reply_to);
+  }
+  /* real_subj is subordinate to subject */
+  if (!base->subject) {
+    base->subject = (*extra)->subject;
+    base->real_subj = (*extra)->real_subj;
+    (*extra)->subject = NULL;
+    (*extra)->real_subj = NULL;
+  }
+  /* spam and user headers should never be hashed, and the new envelope may
+   * have better values. Use new versions regardless. */
+  mutt_buffer_free (&base->spam);
+  mutt_free_list (&base->userhdrs);
+  MOVE_ELEM(spam);
+  MOVE_ELEM(userhdrs);
+#undef MOVE_ELEM
+  
+  mutt_free_envelope(extra);
+}
+
 void _mutt_mktemp (char *s, const char *src, int line)
 {