Fix UNIX mbox driver and mail utility.

The `mail' and `frm' utilities pass tests.

* include/mailutils/stream.h (mu_stream_err): New proto.
* libproto/mbox/mbox.c (_msg_stream_setup)
(_msg_body_setup): Fix stream abridgement.
(mbox_envelope_date, mbox_envelope_sender): Fix seek position.
(uid_to_stream): Fix invocation of mu_stream_printf.
(append_message_to_stream): Likewise.
(mbox_expunge_unlocked): Rewind tempstr before copying its
contents back to the mailbox.
(mbox_expunge0): Open tempstr.
* libproto/mbox/mbox0.h (_mbox_message)<header_from>: Rename to
envel_from.
<header_from_end>: Rename to envel_from_end. All uses changed.
* libproto/mbox/mboxscan.c: Minor changes.

* mail/decode.c: Use streamrefs.
* mail/escape.c: Likewise.
* mail/msgset.y: Likewise.
* mail/pipe.c: Likewise.
* mail/print.c: Likewise.
* mail/top.c: Likewise.
* mail/write.c: Likewise.

* mail/send.c: Use streamrefs.
(mail_send0): Reset env->header after assigning it to
the message.

* mailbox/body.c (_body_seek): Fix a typo which produced
a recursive call.
* mailbox/file_stream.c (fd_truncate): New function.
(_mu_file_stream_create): Initialize str->stream.truncate.

* mailbox/header.c (header_parse): Fix parsing of blurbs lacking
terminating empty line.
(header_seek): Fix boundary checks.
Return new position in presult.
* mailbox/message.c (string_find_eoh): Rewrite to handle \n\n
split between two successive invocations.
(_header_fill): Update the invocation of string_find_eoh.

* mailbox/stream.c (mu_stream_destroy): Call mu_stream_close.
(mu_stream_get_flags, mu_stream_set_flags)
(mu_stream_clr_flags): Ignore internal
bits.
(mu_stream_err): New function.
(mu_stream_close): Close the stream only if it is not used by anyone else.
* mailbox/streamref.c (_streamref_read): Clear transport error if
ESPIPE is returned.
(_streamref_size): Take into account sp->end and sp->start.
(mu_streamref_create_abridged): Set pointer to 0.

@@ -65,6 +65,7 @@ void mu_stream_unref (mu_stream_t stream);
 void mu_stream_destroy (mu_stream_t *pstream);
 int mu_stream_open (mu_stream_t stream);
 const char *mu_stream_strerror (mu_stream_t stream, int rc);
+int mu_stream_err (mu_stream_t stream);
 int mu_stream_last_error (mu_stream_t stream);
 void mu_stream_clearerr (mu_stream_t stream);
 int mu_stream_eof (mu_stream_t stream);

@@ -259,7 +259,7 @@ static int
 mbox_message_qid (mu_message_t msg, mu_message_qid_t *pqid)
 {
   mbox_message_t mum = mu_message_get_owner (msg);
-  return mu_asprintf (pqid, "%lu", (unsigned long) mum->header_from);
+  return mu_asprintf (pqid, "%lu", (unsigned long) mum->envel_from);
 }
 
 
@@ -297,8 +297,8 @@ _msg_stream_setup (mu_message_t msg, mbox_message_t mum)
   
   status = mu_streamref_create_abridged (&stream,
 					 mum->mud->mailbox->stream,
-					 mum->header_from_end + 1,
-					 mum->body);
+					 mum->envel_from_end,
+					 mum->body_end);
   if (status == 0)
     status = mu_message_set_stream (msg, stream, mum);
   return status;
@@ -343,7 +343,7 @@ _msg_body_setup (mu_message_t msg, mbox_message_t mum)
   status = mu_streamref_create_abridged (&stream,
 					 mum->mud->mailbox->stream,
 					 mum->body,
-					 mum->body_end);
+					 mum->body_end - 1);
   if (status)
     mu_body_destroy (&body, msg);
   else
@@ -373,7 +373,7 @@ mbox_envelope_date (mu_envelope_t envelope, char *buf, size_t len,
     return EINVAL;
 
   status = mu_stream_seek (mum->mud->mailbox->stream,
-			   mum->header_from, MU_SEEK_SET,
+			   mum->envel_from, MU_SEEK_SET,
 			   NULL);
   if (status)
     return status;
@@ -419,7 +419,7 @@ mbox_envelope_sender (mu_envelope_t envelope, char *buf, size_t len,
     return EINVAL;
 
   status = mu_stream_seek (mum->mud->mailbox->stream,
-			   mum->header_from, MU_SEEK_SET,
+			   mum->envel_from, MU_SEEK_SET,
 			   NULL);
   if (status)
     return status;
@@ -1022,8 +1022,10 @@ uid_to_stream (mu_stream_t ostr, mu_message_t msg, mbox_data_t mud, int flags)
   else
     uid = mud->uidnext++;
   
-  return mu_stream_printf (ostr, "%s: %u\n", MU_HEADER_X_UID,
-			   (unsigned) uid);
+  mu_stream_printf (ostr, "%s: %u\n", MU_HEADER_X_UID, (unsigned) uid);
+  if (mu_stream_err (ostr))
+    return mu_stream_last_error (ostr);
+  return 0;
 }
 
 /* Append MSG to stream OSTR in its current position */
@@ -1048,12 +1050,14 @@ append_message_to_stream (mu_stream_t ostr, mu_message_t msg,
 
       if (flags & MBOX_FIRSTMSG)
 	{
-	  status = mu_stream_printf (ostr, "%s: %lu %u\n",
-				     MU_HEADER_X_IMAPBASE,
-				     (unsigned long) mud->uidvalidity,
-				     (unsigned) mud->uidnext);
-	  if (status)
-	    return status;
+	  /* FIXME: Perhaps printf should return error code,
+	     like the rest of stream functions. */
+	  mu_stream_printf (ostr, "%s: %lu %u\n",
+			    MU_HEADER_X_IMAPBASE,
+			    (unsigned long) mud->uidvalidity,
+			    (unsigned) mud->uidnext);
+	  if (mu_stream_err (ostr))
+	    return mu_stream_last_error (ostr);
 	}
 
       status = msg_attr_to_stream (ostr, msg);
@@ -1165,7 +1169,7 @@ mbox_reset (mu_mailbox_t mailbox, size_t dirty, int remove_deleted)
 	  else
 	    memset (mum, 0, sizeof (*mum));
 	}
-      mum->header_from = mum->header_from_end = 0;
+      mum->envel_from = mum->envel_from_end = 0;
       mum->body = mum->body_end = 0;
       mum->header_lines = mum->body_lines = 0;
     }
@@ -1187,7 +1191,7 @@ mbox_expunge_unlocked (mu_mailbox_t mailbox, size_t dirty, int remove_deleted,
   mu_off_t size;
 
   /* Set the marker position.  */
-  start_off = mud->umessages[dirty]->header_from;
+  start_off = mud->umessages[dirty]->envel_from;
 
   for (i = dirty; i < mud->messages_count; i++)
     {
@@ -1226,8 +1230,8 @@ mbox_expunge_unlocked (mu_mailbox_t mailbox, size_t dirty, int remove_deleted,
 	      status = mbox_get_message (mailbox, i + 1, &msg);
 	      if (status != 0)
 		{
-		  mu_error (_("error expunging:%d: %s"), __LINE__,
-			    mu_strerror (status));
+		  mu_error (_("%s:%d: error expunging: %s"),	        
+			    __FILE__, __LINE__, mu_strerror (status));	
 		  return status;
 		}
 	    }
@@ -1235,8 +1239,8 @@ mbox_expunge_unlocked (mu_mailbox_t mailbox, size_t dirty, int remove_deleted,
 					     flags);
 	  if (status != 0)
 	    {
-	      mu_error (_("error expunging:%d: %s"), __LINE__,
-		        mu_strerror (status));
+	      mu_error (_("%s:%d: error expunging: %s"),	        
+			__FILE__, __LINE__, mu_strerror (status));	
 	      return status;
 	    }
 	  /* Clear the dirty bits.  */
@@ -1247,7 +1251,7 @@ mbox_expunge_unlocked (mu_mailbox_t mailbox, size_t dirty, int remove_deleted,
 	{
 	  /* Otherwise, copy bits from mailbox->stream as is. */
 	  
-	  status = mu_stream_seek (mailbox->stream, mum->header_from,
+	  status = mu_stream_seek (mailbox->stream, mum->envel_from,
 				   MU_SEEK_SET, NULL);
 	  if (status)
 	    {
@@ -1257,7 +1261,7 @@ mbox_expunge_unlocked (mu_mailbox_t mailbox, size_t dirty, int remove_deleted,
 	      return status;
 	    }
 	  status = mu_stream_copy (tempstr, mailbox->stream,
-				   mum->body_end - mum->header_from);
+				   mum->body_end - mum->envel_from);
 	  if (status)
 	    {
 	      mu_error (_("%s:%d: error copying: %s"),
@@ -1336,10 +1340,19 @@ mbox_expunge_unlocked (mu_mailbox_t mailbox, size_t dirty, int remove_deleted,
       return status;
     }
   
+  status = mu_stream_seek (tempstr, 0, MU_SEEK_SET, NULL);
+  if (status)
+    {
+      mu_error (_("%s:%d: seek error: %s"),
+		__FILE__, __LINE__,
+		mu_stream_strerror (mailbox->stream, status));
+      return status;
+    }
+
   status = mu_stream_copy (mailbox->stream, tempstr, size);
   if (status)
     {
-      mu_error (_("%s:%d: error writing to temporary stream: %s"),
+      mu_error (_("%s:%d: copying from the temporary stream: %s"),
 		__FILE__, __LINE__,
 		mu_strerror (status));
       return status;
@@ -1395,30 +1408,35 @@ mbox_expunge0 (mu_mailbox_t mailbox, int remove_deleted)
   status = mu_temp_file_stream_create (&tempstr, NULL);
   if (status == 0)
     {
-      sigset_t signalset;
+      status = mu_stream_open (tempstr);
+      if (status == 0)
+	{
+	  sigset_t signalset;
 #ifdef WITH_PTHREAD
-      int state;
-      pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state);
+	  int state;
+	  pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state);
 #endif
-      sigemptyset (&signalset);
-      sigaddset (&signalset, SIGTERM);
-      sigaddset (&signalset, SIGHUP);
-      sigaddset (&signalset, SIGTSTP);
-      sigaddset (&signalset, SIGINT);
-      sigaddset (&signalset, SIGWINCH);
-      sigprocmask (SIG_BLOCK, &signalset, 0);
-
-      status = mbox_expunge_unlocked (mailbox, dirty, remove_deleted, tempstr);
+	  sigemptyset (&signalset);
+	  sigaddset (&signalset, SIGTERM);
+	  sigaddset (&signalset, SIGHUP);
+	  sigaddset (&signalset, SIGTSTP);
+	  sigaddset (&signalset, SIGINT);
+	  sigaddset (&signalset, SIGWINCH);
+	  sigprocmask (SIG_BLOCK, &signalset, 0);
+	  
+	  status = mbox_expunge_unlocked (mailbox, dirty, remove_deleted,
+					  tempstr);
 
 #ifdef WITH_PTHREAD
-      pthread_setcancelstate (state, &state);
+	  pthread_setcancelstate (state, &state);
 #endif
-      sigprocmask (SIG_UNBLOCK, &signalset, 0);
+	  sigprocmask (SIG_UNBLOCK, &signalset, 0);
       
-      mu_stream_destroy (&tempstr);
+	  mu_stream_destroy (&tempstr);
 
-      if (status == 0)
-	mbox_reset (mailbox, dirty, remove_deleted);
+	  if (status == 0)
+	    mbox_reset (mailbox, dirty, remove_deleted);
+	}
     }
   mu_locker_unlock (mailbox->locker);
   return status;

@@ -71,8 +71,8 @@ typedef struct _mbox_message *mbox_message_t;
 struct _mbox_message
 {
   /* Offset of the messages in the mailbox.  */
-  mu_off_t header_from;        /* Start of envelope (^From ) */
-  mu_off_t header_from_end;    /* End of envelope (terminating \n) */
+  mu_off_t envel_from;         /* Start of envelope (^From ) */
+  mu_off_t envel_from_end;     /* End of envelope (terminating \n) */
   mu_off_t body;               /* Start of body */
   mu_off_t body_end;           /* End of body */
 

@@ -359,11 +359,10 @@ mbox_scan_internal (mu_mailbox_t mailbox, mbox_message_t mum,
 		}
 	      /* Allocate_msgs will initialize mum.  */
 	      ALLOCATE_MSGS (mailbox, mud);
-	      mud->messages_count++;
-	      mum = mud->umessages[mud->messages_count - 1];
+	      mum = mud->umessages[mud->messages_count++];
 	      mum->mud = mud;
-              mum->header_from = total - n;
-              mum->header_from_end = total;
+              mum->envel_from = total - n;
+              mum->envel_from_end = total;
 	      mum->body_end = mum->body = 0;
 	      mum->attr_flags = 0;
 	      lines = 0;
@@ -467,7 +466,7 @@ mbox_scan0 (mu_mailbox_t mailbox, size_t msgno, size_t *pcount, int do_notif)
     {
       mum = mud->umessages[msgno - 1];
       if (mum)
-	total = mum->header_from;
+	total = mum->envel_from;
       mud->messages_count = msgno - 1;
     }
   else

@@ -116,8 +116,11 @@ display_headers (FILE *out, mu_message_t mesg,
     {
       mu_stream_t stream = NULL;
       if (mu_message_get_header (mesg, &hdr) == 0
-	  && mu_header_get_stream (hdr, &stream) == 0)
-	print_stream (stream, out);
+	  && mu_header_get_streamref (hdr, &stream) == 0)
+	{
+	  print_stream (stream, out);
+	  mu_stream_destroy (&stream);
+	}
     }
 }
 
@@ -254,12 +257,12 @@ display_submessage (struct mime_descend_closure *closure, void *data)
       
       mu_message_get_body (closure->message, &body);
       mu_message_get_header (closure->message, &hdr);
-      mu_body_get_stream (body, &b_stream);
+      mu_body_get_streamref (body, &b_stream);
 
       /* Can we decode.  */
-      if (mu_filter_create(&d_stream, b_stream, closure->encoding,
-			   MU_FILTER_DECODE, 
-			   MU_STREAM_READ|MU_STREAM_NO_CLOSE) == 0)
+      if (mu_filter_create (&d_stream, b_stream, closure->encoding,
+			    MU_FILTER_DECODE, 
+			    MU_STREAM_READ|MU_STREAM_NO_CLOSE) == 0)
 	stream = d_stream;
       else
 	stream = b_stream;
@@ -303,13 +306,13 @@ display_submessage (struct mime_descend_closure *closure, void *data)
 	  if (out != ofile)
 	    pclose (out);
 	}
-      if (d_stream)
-	mu_stream_destroy (&d_stream);
+      mu_stream_destroy (&stream);
     }
   
   return 0;
 }
 
+/* FIXME: Try to use mu_stream_copy instead */
 static int
 print_stream (mu_stream_t stream, FILE *out)
 {
@@ -317,12 +320,6 @@ print_stream (mu_stream_t stream, FILE *out)
   size_t n = 0;
   int rc;
   
-  rc = mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
-  if (rc)
-    {
-      util_error (_("seek error: %s"), mu_stream_strerror (stream, rc));
-      return rc;
-    }
   while (mu_stream_read (stream, buffer, sizeof (buffer) - 1, &n) == 0
 	 && n != 0)
     {
@@ -397,20 +394,18 @@ run_metamail (const char *mailcap_cmd, mu_message_t mesg)
     {
       /* Child process */
       int status;
-      mu_stream_t stream;
+      mu_stream_t stream = NULL;
 
       do /* Fake loop to avoid gotos */
 	{
 	  mu_stream_t pstr;
-	  char buffer[512];
-	  size_t n;
 	  char *no_ask;
 	  
 	  setenv ("METAMAIL_PAGER", getenv ("PAGER"), 0);
 	  if (mailvar_get (&no_ask, "mimenoask", mailvar_type_string, 0))
 	    setenv ("MM_NOASK", no_ask, 1);
 	  
-	  status = mu_message_get_stream (mesg, &stream);
+	  status = mu_message_get_streamref (mesg, &stream);
 	  if (status)
 	    {
 	      mu_error ("mu_message_get_stream: %s", mu_strerror (status));
@@ -430,12 +425,7 @@ run_metamail (const char *mailcap_cmd, mu_message_t mesg)
 	      mu_error ("mu_stream_open: %s", mu_strerror (status));
 	      break;
 	    }
-	  mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
-	  while (mu_stream_read (stream, buffer, sizeof buffer - 1,
-				 &n) == 0
-		 && n > 0)
-	    mu_stream_write (pstr, buffer, n, NULL);
-
+	  mu_stream_copy (pstr, stream, 0);
 	  mu_stream_close (pstr);
 	  mu_stream_destroy (&pstr);
 	  exit (0);

@@ -30,19 +30,21 @@ dump_headers (FILE *fp, compose_env_t *env)
   size_t n;
   int rc;
   
-  mu_header_get_stream (env->header, &stream);
-  rc = mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+  rc = mu_header_get_streamref (env->header, &stream);
   if (rc)
     {
-      util_error (_("seek error: %s"), mu_stream_strerror (stream, rc));
+      util_error ("mu_header_get_streamref: %s",
+		  mu_stream_strerror (stream, rc));
       return;
     }
+  /* FIXME: Use mu_stream_copy */
   while (mu_stream_read (stream, buffer, sizeof buffer - 1, &n) == 0
 	 && n != 0)
     {
       buffer[n] = 0;
       fprintf (fp, "%s", buffer);
     }
+  mu_stream_destroy (&stream);
 }
 
 #define STATE_INIT 0
@@ -478,24 +480,25 @@ quote0 (msgset_t *mspec, mu_message_t mesg, void *data)
 	}
       fprintf (ofile, "%s\n", prefix);
       mu_message_get_body (mesg, &body);
-      mu_body_get_stream (body, &stream);
+      rc = mu_body_get_streamref (body, &stream);
     }
   else
-    mu_message_get_stream (mesg, &stream);
+    rc = mu_message_get_streamref (mesg, &stream);
 
-  rc = mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
   if (rc)
     {
-      util_error (_("seek error: %s"), mu_stream_strerror (stream, rc));
+      util_error (_("get_streamref error: %s"), mu_strerror (rc));
       return rc;
     }
-  
+
+  /* FIXME: Use mu_stream_copy? */
   while (mu_stream_readline (stream, buffer, sizeof buffer - 1, &n) == 0
 	 && n != 0)
     {
       buffer[n] = '\0';
       fprintf (ofile, "%s%s", prefix, buffer);
     }
+  mu_stream_destroy (&stream);
   return 0;
 }
 

@@ -629,8 +629,7 @@ select_body (mu_message_t msg, void *closure)
   mu_message_get_body (msg, &body);
   mu_body_size (body, &size);
   mu_body_lines (body, &lines);
-  mu_body_get_stream (body, &stream);
-  status = mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+  status = mu_body_get_streamref (body, &stream);
   while (status == 0
 	 && mu_stream_readline (stream, buffer, sizeof(buffer)-1, &n) == 0
 	 && n > 0)
@@ -643,7 +642,7 @@ select_body (mu_message_t msg, void *closure)
       else
 	status = regexec (&re, buffer, 0, NULL, 0);
     }
-
+  mu_stream_destroy (&stream);
   if (!noregex)
     regfree (&re);
 

@@ -49,14 +49,15 @@ mail_pipe (int argc, char **argv)
     {
       if (util_get_message (mbox, mp->msg_part[0], &msg) == 0)
 	{
-	  mu_message_get_stream (msg, &stream);
-	  mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+	  mu_message_get_streamref (msg, &stream);
+	  /* FIXME: Use mu_stream_copy */
 	  while (mu_stream_read (stream, buffer, sizeof (buffer) - 1, &n) == 0
 		 && n != 0)
 	    {
 	      buffer[n] = '\0';
 	      fprintf (tube, "%s", buffer);
 	    }
+	  mu_stream_destroy (&stream);
 	  if (mailvar_get (NULL, "page", mailvar_type_boolean, 0) == 0)
 	    fprintf (tube, "\f\n");
 	}

@@ -36,6 +36,7 @@ mail_print_msg (msgset_t *mspec, mu_message_t mesg, void *data)
   size_t n = 0, lines = 0;
   FILE *out = ofile;
   int pagelines = util_get_crt ();
+  int status;
   
   mu_message_lines (mesg, &lines);
   if (mailvar_get (NULL, "showenvelope", mailvar_type_boolean, 0) == 0)
@@ -89,12 +90,18 @@ mail_print_msg (msgset_t *mspec, mu_message_t mesg, void *data)
 	}
       fprintf (out, "\n");
       mu_message_get_body (mesg, &body);
-      mu_body_get_stream (body, &stream);
+      status = mu_body_get_streamref (body, &stream);
     }
   else
-    mu_message_get_stream (mesg, &stream);
+    status = mu_message_get_streamref (mesg, &stream);
 
-  mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+  if (status)
+    {
+      mu_error (_("get_stream error: %s"), mu_strerror (status));
+      return 0;
+    }
+
+  /* FIXME: Use mu_stream_copy instead? */
   while (mu_stream_read (stream, buffer, sizeof buffer - 1, &n) == 0
 	 && n != 0)
     {
@@ -106,6 +113,7 @@ mail_print_msg (msgset_t *mspec, mu_message_t mesg, void *data)
       buffer[n] = '\0';
       fprintf (out, "%s", buffer);
     }
+  mu_stream_destroy (&stream);
   if (out != ofile)
     pclose (out);
   

@@ -293,36 +293,37 @@ compose_header_get (compose_env_t * env, char *name, char *defval)
 }
 
 void
-compose_destroy (compose_env_t * env)
+compose_destroy (compose_env_t *env)
 {
   mu_header_destroy (&env->header);
   free (env->outfiles);
 }
 
+/* FIXME: Can we use mu_stream_t instead of FILE? If so,
+   replace the loop with a call to mu_stream_copy. */
 static int
 fill_body (mu_message_t msg, FILE *file)
 {
   mu_body_t body = NULL;
   mu_stream_t stream = NULL;
-  off_t offset = 0;
   char *buf = NULL;
   size_t n = 0;
   mu_message_get_body (msg, &body);
-  mu_body_get_stream (body, &stream);
-
-  mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
-  offset = 0;
+  mu_body_get_streamref (body, &stream);
+  int nullbody = 1;
+  
   while (getline (&buf, &n, file) >= 0)
     {
       size_t len = strlen (buf);
+      if (len)
+	nullbody = 0;
       mu_stream_write (stream, buf, len, NULL);
-      offset += len;
     }
-	    
+  mu_stream_destroy (&stream);
   if (buf)
     free (buf);
 
-  if (offset == 0)
+  if (nullbody)
     {
       if (mailvar_get (NULL, "nullbody", mailvar_type_boolean, 0) == 0)
 	{
@@ -525,7 +526,6 @@ mail_send0 (compose_env_t * env, int save_to)
 	  int rc;
 	  
 	  mu_message_create (&msg, NULL);
-	  mu_message_set_header (msg, env->header, NULL);
 
 	  /* Fill the body.  */
 	  rc = fill_body (msg, file);
@@ -599,6 +599,8 @@ mail_send0 (compose_env_t * env, int save_to)
 		  if (mailvar_get (&sendmail, "sendmail",
 				   mailvar_type_string, 0) == 0)
 		    {
+		      mu_message_set_header (msg, env->header, NULL);
+		      env->header = NULL;
 		      if (sendmail[0] == '/')
 			msg_to_pipe (sendmail, msg);
 		      else
@@ -669,14 +671,15 @@ msg_to_pipe (const char *cmd, mu_message_t msg)
       mu_stream_t stream = NULL;
       char buffer[512];
       size_t n = 0;
-      mu_message_get_stream (msg, &stream);
-      mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+      /* FIXME: Use mu_stream_copy */
+      mu_message_get_streamref (msg, &stream);
       while (mu_stream_read (stream, buffer, sizeof buffer - 1, &n) == 0
 	     && n != 0)
 	{
 	  buffer[n] = '\0';
 	  fprintf (fp, "%s", buffer);
 	}
+      mu_stream_destroy (&stream);
       pclose (fp);
     }
   else

@@ -35,8 +35,8 @@ top0 (msgset_t *mspec, mu_message_t msg, void *data)
       || lines < 0)
     return 1;
 
-  mu_message_get_stream (msg, &stream);
-  mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+  /* FIXME: Use mu_stream_copy */
+  mu_message_get_streamref (msg, &stream);
   for (; lines > 0; lines--)
     {
       int status = mu_stream_readline (stream, buf, sizeof (buf), &n);
@@ -44,6 +44,7 @@ top0 (msgset_t *mspec, mu_message_t msg, void *data)
 	break;
       fprintf (ofile, "%s", buf);
     }
+  mu_stream_destroy (&stream);
   set_cursor (mspec->msg_part[0]);
 
   util_mark_read (msg);

@@ -98,8 +98,8 @@ mail_write (int argc, char **argv)
       mu_body_lines (bod, &size);
       total_lines += size;
 
-      mu_body_get_stream (bod, &stream);
-      mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
+      /* FIXME: Use mu_stream_copy */
+      mu_body_get_streamref (bod, &stream);
       /* should there be a separator? */
       while (mu_stream_read (stream, buffer, sizeof (buffer) - 1, &n) == 0
 	     && n != 0)
@@ -107,7 +107,8 @@ mail_write (int argc, char **argv)
 	  buffer[n] = '\0';
 	  fprintf (output, "%s", buffer);
 	}
-
+      mu_stream_destroy (&stream);
+      
       /* mark as saved. */
 
       mu_message_get_attribute (msg, &attr);

@@ -285,7 +285,7 @@ _body_seek (mu_stream_t stream, mu_off_t off, int whence, mu_off_t *presult)
 {
   struct _mu_body_stream *str = (struct _mu_body_stream*) stream;
   mu_body_t body = str->body;
-  return mu_stream_seek (body->stream, off, whence, presult);
+  return mu_stream_seek (body->fstream, off, whence, presult);
 }
 
 static const char *

@@ -221,6 +221,15 @@ fd_wait (mu_stream_t stream, int *pflags, struct timeval *tvp)
 }
 
 int
+fd_truncate (mu_stream_t stream, mu_off_t size)
+{
+  struct _mu_file_stream *fstr = (struct _mu_file_stream *) stream;
+  if (ftruncate (fstr->fd, size))
+    return errno;
+  return 0;
+}
+
+int
 _mu_file_stream_create (mu_stream_t *pstream, size_t size,
 			char *filename, int flags)
 {
@@ -239,6 +248,7 @@ _mu_file_stream_create (mu_stream_t *pstream, size_t size,
   str->stream.size = fd_size;
   str->stream.ctl = fd_ioctl;
   str->stream.wait = fd_wait;
+  str->stream.truncate = fd_truncate;
   str->stream.error_string = fd_error_string;
 
   str->filename = filename;

@@ -329,7 +329,7 @@ header_parse (mu_header_t header, const char *blurb, int len)
        *[ (' ' | '\t') field-value '\r' '\n' ]
   */
   /* First loop goes through the blurb */
-  for (header_start = blurb;  ; header_start = ++header_end)
+  for (header_start = blurb; len > 0; header_start = ++header_end)
     {
       const char *fn, *fn_end, *fv, *fv_end;
       struct mu_hdrent *ent;
@@ -340,7 +340,7 @@ header_parse (mu_header_t header, const char *blurb, int len)
 	break;
 
       /* Second loop extract one header field. */
-      for (header_start2 = header_start;  ;header_start2 = ++header_end)
+      for (header_start2 = header_start; len; header_start2 = ++header_end)
 	{
 	  header_end = memchr (header_start2, '\n', len);
 	  if (header_end == NULL)
@@ -348,21 +348,14 @@ header_parse (mu_header_t header, const char *blurb, int len)
 	  else
 	    {
 	      len -= (header_end - header_start2 + 1);
-	      if (len < 0)
-		{
-		  header_end = NULL;
-		  break;
-		}
-	      if (header_end[1] != ' '
-		  && header_end[1] != '\t')
+	      if (!len
+		  || (header_end[1] != ' '
+		      && header_end[1] != '\t'))
 		break; /* New header break the inner for. */
 	    }
 	  /* *header_end = ' ';  smash LF ? NO */
 	}
 
-      if (header_end == NULL)
-	break; /* FIXME: Bail out.  */
-      
       /* Now save the header in the data structure.  */
 
       /* Treats unix "From " specially.  FIXME: Should we? */
@@ -956,9 +949,10 @@ header_seek (mu_stream_t str, mu_off_t off, int whence, mu_off_t *presult)
       break;
     }
 
-  if (off < 0 || off >= hstr->hdr->size)
+  if (off < 0 || off > hstr->hdr->size)
     return ESPIPE;
   hstr->off = off;
+  *presult = off;
   return 0;
 }
 

@@ -270,21 +270,35 @@ _message_stream_create (mu_stream_t *pmsg, mu_message_t msg, int flags)
 }
 
 
+enum eoh_state
+  {
+    eoh_no,
+    eoh_maybe,
+    eoh_yes
+  };
+
 /* Message header stuff */
-static int
-string_find_eoh (const char *str, size_t len, size_t *ppos)
+static enum eoh_state
+string_find_eoh (enum eoh_state eoh, const char *str, size_t len,
+		 size_t *ppos)
 {
   size_t pos;
-  int eoh = 0;
+
+  if (eoh == eoh_maybe && *str == '\n')
+    {
+      *ppos = 0;
+      return eoh_yes;
+    }
   
-  for (pos = 0; pos < len-1; pos++)
-    if (str[pos] == '\n' && str[pos+1] == '\n')
+  for (pos = 0; pos < len - 1; pos++)
+    if (str[pos] == '\n' && str[pos + 1] == '\n')
       {
-	eoh = 1;
-	break;
+	*ppos = pos + 1;
+	return eoh_yes;
       }
+  
   *ppos = pos + 1;
-  return eoh;
+  return str[pos] == '\n' ? eoh_maybe : eoh_no;
 }
 
 #define MIN_HEADER_BUF_SIZE 2048
@@ -297,17 +311,21 @@ _header_fill (mu_stream_t stream, char **pbuf, size_t *plen)
   size_t bufsize = 0;
   char inbuf[MIN_HEADER_BUF_SIZE];
   size_t nread;
+  enum eoh_state eoh = eoh_no;
   
   status = mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
   if (status)
     return status;
       
-  while ((status = mu_stream_read (stream, inbuf, sizeof (inbuf), &nread))
-	 == 0 && nread)
+  while (eoh != eoh_yes
+	 && (status = mu_stream_read (stream, inbuf, sizeof (inbuf), &nread))
+	    == 0
+	 && nread)
     {
       char *nbuf;
       size_t len;
-      int eoh = string_find_eoh (inbuf, nread, &len);
+
+      eoh = string_find_eoh (eoh, inbuf, nread, &len);
       
       nbuf = realloc (buffer, bufsize + len);
       if (!nbuf)
@@ -318,8 +336,6 @@ _header_fill (mu_stream_t stream, char **pbuf, size_t *plen)
       memcpy (nbuf + bufsize, inbuf, len);
       buffer = nbuf;
       bufsize += len;
-      if (eoh)
-	break;
     }
 
   if (status)

@@ -53,7 +53,7 @@ _stream_seterror (struct _mu_stream *stream, int code, int perm)
 #define _stream_cleareof(s) ((s)->flags &= ~_MU_STR_EOF)
 #define _stream_advance_buffer(s,n) ((s)->cur += n, (s)->level -= n)
 #define _stream_buffer_offset(s) ((s)->cur - (s)->buffer)
-#define _stream_orig_level(s) ((s)->level + _stream_buffer_offset(s))
+#define _stream_orig_level(s) ((s)->level + _stream_buffer_offset (s))
 
 static int
 _stream_fill_buffer (struct _mu_stream *stream)
@@ -202,6 +202,7 @@ mu_stream_destroy (mu_stream_t *pstream)
       mu_stream_t str = *pstream;
       if (str && (str->ref_count == 0 || --str->ref_count == 0))
 	{
+	  mu_stream_close (str);
 	  if (str->done)
 	    str->done (str);
 	  free (str);
@@ -213,7 +214,7 @@ mu_stream_destroy (mu_stream_t *pstream)
 void
 mu_stream_get_flags (mu_stream_t str, int *pflags)
 {
-  *pflags = str->flags;
+  *pflags = str->flags & ~_MU_STR_INTERN_MASK;
 }
   
 void
@@ -252,6 +253,12 @@ mu_stream_strerror (mu_stream_t stream, int rc)
 }
 
 int
+mu_stream_err (mu_stream_t stream)
+{
+  return stream->flags & _MU_STR_ERR;
+}
+
+int
 mu_stream_last_error (mu_stream_t stream)
 {
   return stream->last_err;
@@ -700,6 +707,9 @@ mu_stream_close (mu_stream_t stream)
   if (!stream)
     return EINVAL;
   mu_stream_flush (stream);
+  /* Do close the stream only if it is not used by anyone else */
+  if (stream->ref_count > 1)
+    return 0;
   if (stream->close)
     rc = stream->close (stream);
   return rc;
@@ -785,7 +795,7 @@ mu_stream_set_flags (mu_stream_t stream, int fl)
 {
   if (stream == NULL)
     return EINVAL;
-  stream->flags |= fl;
+  stream->flags |= (fl & ~_MU_STR_INTERN_MASK);
   return 0;
 }
 
@@ -794,7 +804,7 @@ mu_stream_clr_flags (mu_stream_t stream, int fl)
 {
   if (stream == NULL)
     return EINVAL;
-  stream->flags &= ~fl;
+  stream->flags &= ~(fl & ~_MU_STR_INTERN_MASK);
   return 0;
 }
 

@@ -62,7 +62,7 @@ _streamref_read (struct _mu_stream *str, char *buf, size_t bufsize,
   else if (rc == ESPIPE)
     {
       *pnread = 0;
-      str->flags |= _MU_STR_EOF;
+      mu_stream_clearerr (sp->transport);
       return 0;
     }
   return streamref_return (sp, rc);
@@ -170,7 +170,21 @@ static int
 _streamref_size (struct _mu_stream *str, mu_off_t *psize)
 {
   struct _mu_streamref *sp = (struct _mu_streamref *)str;
-  return streamref_return (sp, mu_stream_size (sp->transport, psize));
+  mu_off_t size;
+  int rc = 0;
+  
+  if (sp->end)
+    size = sp->end - sp->start + 1;
+  else
+    {
+      rc = mu_stream_size (sp->transport, &size);
+      if (rc)
+	return streamref_return (sp, rc);
+      size -= sp->start;
+    }
+  if (rc == 0)
+    *psize = size;
+  return rc;
 }
 
 static int
@@ -240,12 +254,11 @@ mu_streamref_create_abridged (mu_stream_t *pref, mu_stream_t str,
   int flags;
   struct _mu_streamref *sp;
 
-  rc = mu_stream_seek (str, 0, MU_SEEK_CUR, &off);
+  rc = mu_stream_seek (str, 0, MU_SEEK_SET, &off);
   if (rc)
     return rc;
   mu_stream_get_flags (str, &flags);
-  sp = (struct _mu_streamref *) _mu_stream_create (sizeof (*sp),
-						   flags | MU_STREAM_NO_CLOSE);
+  sp = (struct _mu_streamref *) _mu_stream_create (sizeof (*sp), flags);
   if (!sp)
     return ENOMEM;
   mu_stream_ref (str);