Fix appending to IMAP[S] mailboxes

* libproto/imap/appmsg.c (mu_imap_append_message): Fix conditional.
* libproto/imap/mbox.c (_imap_mbx_append_message): Fix error checking.
* libproto/imap/url.c (_mu_imap_url_init)
(_mu_imaps_url_init): Set _get_path member.  This allows the user
to specify an URL without explicit path, implying INBOX.

@@ -36,7 +36,7 @@ mu_imap_append_message (mu_imap_t imap, const char *mailbox, int flags,
   int rc;
 
   rc = mu_message_get_streamref (msg, &str);
-  if (rc)
+  if (rc == 0)
     {
       rc = mu_imap_append_stream (imap, mailbox, flags, tm, tz, str);
       mu_stream_unref (str);

@@ -1106,6 +1106,8 @@ _imap_mbx_append_message (mu_mailbox_t mbox, mu_message_t msg)
   if (rc)
     return rc;
   rc = mu_url_sget_path (url, &mbox_name);
+  if (rc)
+    return rc;
   return mu_imap_append_message (imap, mbox_name, 0, NULL, NULL, msg);
 }
 

@@ -29,6 +29,7 @@
 #include <mailutils/sys/registrar.h>
 #include <mailutils/sys/url.h>
 #include <mailutils/sys/imap.h>
+#include <mailutils/util.h>
 
 static void url_imap_destroy (mu_url_t url);
 
@@ -37,6 +38,16 @@ url_imap_destroy (mu_url_t url MU_ARG_UNUSED)
 {
 }
 
+static int
+url_imap_get_path (const mu_url_t url, char *bufptr, size_t bufsize,
+		   size_t *rsize)
+{
+  bufsize = mu_cpystr (bufptr, "INBOX", bufsize);
+  if (rsize)
+    *rsize = bufsize;
+  return 0;
+}
+
 /*
   IMAP URLs:
     imap://[<user>[;AUTH=<auth>]@]<host>[/<mailbox>]
@@ -50,6 +61,7 @@ _mu_imap_url_init (mu_url_t url)
     url->port = MU_IMAP_PORT;
   
   url->_destroy = url_imap_destroy;
+  url->_get_path = url_imap_get_path;
     
   if (!url->host || url->qargc)
     return EINVAL;
@@ -81,6 +93,7 @@ _mu_imaps_url_init (mu_url_t url)
     url->port = MU_IMAPS_PORT;
   
   url->_destroy = url_imap_destroy;
+  url->_get_path = url_imap_get_path;
 
   if (!url->host || url->qargc)
     return EINVAL;