Fix interaction with POP3 servers that do not support the CAPA command.

* libproto/pop/mbox.c (pop_open): Do not bail
out if the CAPA command returns -ERR. Assume
a pre-RFC2449 server.
* include/mailutils/pop3.h (mu_pop3_strresp)
(mu_pop3_sget_response,mu_pop3_aget_response)
(mu_pop3_get_response): New protos.
* libproto/pop/pop3_response.c (mu_pop3_response): Don't
make out a fake response in case of a I/O error.
(mu_pop3_strresp)
(mu_pop3_sget_response,mu_pop3_aget_response)
(mu_pop3_get_response): New functions.

@@ -55,7 +55,7 @@ int  mu_pop3_apop (mu_pop3_t pop3, const char *name, const char *digest);
 
 int  mu_pop3_stls (mu_pop3_t pop3);
 
-/* It is the responsability of the caller to call mu_iterator_destroy() when
+/* It is the responsibility of the caller to call mu_iterator_destroy() when
    done with the iterator.  The items returned by the iterator are of type
    "const char *", no processing is done on the item except the removal of
    the trailing newline.  */
@@ -82,7 +82,7 @@ int  mu_pop3_pass (mu_pop3_t pop3, const char *pass);
 
 int  mu_pop3_quit (mu_pop3_t pop3);
 
-/* A stream is returned with the multi-line answer.  It is the responsability
+/* A stream is returned with the multi-line answer.  It is the responsibility
    of the caller to call mu_stream_destroy() to dipose of the stream.  */
 int  mu_pop3_retr (mu_pop3_t pop3, unsigned int mesgno,
 		   mu_stream_t *pstream);
@@ -91,12 +91,12 @@ int  mu_pop3_rset (mu_pop3_t pop3);
 
 int  mu_pop3_stat (mu_pop3_t pop3, size_t *count, mu_off_t *octets);
 
-/* A stream is returned with the multi-line answer.  It is the responsability
+/* A stream is returned with the multi-line answer.  It is the responsibility
    of the caller to call mu_stream_destroy() to dipose of the stream.  */
 int  mu_pop3_top (mu_pop3_t pop3, unsigned int mesgno,
 		  unsigned int lines, mu_stream_t *pstream);
 
-/* The uidl is malloc'ed and returned in puidl; it is the responsability of
+/* The uidl is malloc'ed and returned in puidl; it is the responsibility of
    the caller to free() the uild when done.  */
 int  mu_pop3_uidl (mu_pop3_t pop3, unsigned int mesgno, char **puidl);
 
@@ -116,6 +116,10 @@ int mu_pop3_user (mu_pop3_t pop3, const char *user);
    the message could be retrieved, but it is up to the caller to do the
    parsing.  */
 int  mu_pop3_response (mu_pop3_t pop3, size_t *nread);
+const char *mu_pop3_strresp (mu_pop3_t pop3);
+int mu_pop3_sget_response (mu_pop3_t pop3, const char **sptr);
+int mu_pop3_aget_response (mu_pop3_t pop3, char **sptr);
+int mu_pop3_get_response (mu_pop3_t pop3, char *buf, size_t len, size_t *plen);
   
 int  mu_pop3_writeline (mu_pop3_t pop3, const char *format, ...)
                                   MU_PRINTFLIKE(2,3);

@@ -179,8 +179,15 @@ pop_open (mu_mailbox_t mbox, int flags)
 	break;
 
       status = mu_pop3_capa (mpd->pop3, 1, NULL);
-      if (status)
-	break;
+      if (status == MU_ERR_REPLY) 
+        {
+	  mu_debug (MU_DEBCAT_MAILBOX, MU_DEBUG_ERROR, 
+		    ("server rejected the CAPA command: %s",
+		     mu_pop3_strresp (mpd->pop3)));
+	  /* try to continue anyway */
+        } 
+      else if (status)
+	return status;
 
 #ifdef WITH_TLS      
       if (!mpd->pops &&

@@ -25,8 +25,7 @@
 #include <mailutils/cctype.h>
 #include <mailutils/cstr.h>
 #include <mailutils/sys/pop3.h>
-
-#define POP3_DEFERR "-ERR POP3 IO ERROR"
+#include <mailutils/util.h>
 
 /* If we did not grap the ack already, call pop3_readline() but handle
    Nonblocking also.  */
@@ -48,21 +47,6 @@ mu_pop3_response (mu_pop3_t pop3, size_t *pnread)
 	  n = mu_rtrim_class (pop3->ackbuf, MU_CTYPE_SPACE);
 	  MU_POP3_FSET (pop3, MU_POP3_ACK); /* Flag that we have the ack.  */
 	}
-      else
-	{
-	  /* Provide them with an error.  */
-	  if (pop3->acksize < sizeof (POP3_DEFERR))
-	    {
-	      char *p = realloc (pop3->ackbuf, sizeof (POP3_DEFERR));
-	      if (p)
-		{
-		  pop3->ackbuf = p;
-		  pop3->acksize = sizeof (POP3_DEFERR);
-		}
-	    }
-	  if (pop3->ackbuf)
-	    strncpy (pop3->ackbuf, POP3_DEFERR, pop3->acksize);
-	}
     }
   else if (pop3->ackbuf)
     n = strlen (pop3->ackbuf);
@@ -78,3 +62,57 @@ mu_pop3_response (mu_pop3_t pop3, size_t *pnread)
     *pnread = n;
   return status;
 }
+
+const char *
+mu_pop3_strresp (mu_pop3_t pop3)
+{
+    if (pop3 == NULL)
+      return NULL;
+    if (!MU_POP3_FISSET (pop3, MU_POP3_ACK))
+      return NULL;
+    return pop3->ackbuf;
+}
+
+int
+mu_pop3_sget_response (mu_pop3_t pop3, const char **sptr)
+{
+  if (pop3 == NULL)
+    return EINVAL;
+  if (!MU_POP3_FISSET (pop3, MU_POP3_ACK))
+    return MU_ERR_NOENT;
+  *sptr = pop3->ackbuf;
+  return 0;
+}
+
+int
+mu_pop3_aget_response (mu_pop3_t pop3, char **sptr)
+{
+  char *p;
+  
+  if (pop3 == NULL)
+    return EINVAL;
+  if (!MU_POP3_FISSET (pop3, MU_POP3_ACK))
+    return MU_ERR_NOENT;
+  p = strdup (pop3->ackbuf);
+  if (!p)
+    return ENOMEM;
+  *sptr = p;
+  return 0;
+}
+
+int
+mu_pop3_get_response (mu_pop3_t pop3, char *buf, size_t len, size_t *plen)
+{
+  size_t size;
+  
+  if (pop3 == NULL)
+    return EINVAL;
+  if (!MU_POP3_FISSET (pop3, MU_POP3_ACK))
+    return MU_ERR_NOENT;
+  
+  if (buf)
+    size = mu_cpystr (buf, pop3->ackbuf, len);
+  if (plen)
+    *plen = size;
+  return 0;
+}