common: Add function print_assuan_status.

* common/asshelp2.c: New.
(print_assuan_status): New function.
* common/Makefile.am (common_sources): Add asshelp2.c.

common/Makefile.am

@@ -79,7 +79,7 @@ common_sources = \
 	membuf.c membuf.h \
 	iobuf.c iobuf.h \
 	ttyio.c ttyio.h \
-	asshelp.c asshelp.h \
+	asshelp.c asshelp2.c asshelp.h \
 	exechelp.h \
 	signal.c \
 	audit.c audit.h \

common/asshelp.h

@@ -25,6 +25,8 @@
 
 #include "session-env.h"
 
+/*-- asshelp.c --*/
+
 void setup_libassuan_logging (unsigned int *debug_var_address);
 void set_libassuan_log_cats (unsigned int newcats);
 
@@ -62,5 +64,14 @@ start_new_dirmngr (assuan_context_t *r_ctx,
                    ctrl_t status_cb_arg);
 
 
+/*-- asshelp2.c --*/
+
+/* Helper function to print an assuan status line using a printf
+   format string.  */
+gpg_error_t print_assuan_status (assuan_context_t ctx,
+                                 const char *keyword,
+                                 const char *format,
+                                 ...) JNLIB_GCC_A_PRINTF(3,4);
+
 
 #endif /*GNUPG_COMMON_ASSHELP_H*/

common/asshelp2.c

@@ -0,0 +1,49 @@
+/* asshelp2.c - More helper functions for Assuan
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assuan.h>
+
+#include "util.h"
+#include "asshelp.h"
+
+/* Helper function to print an assuan status line using a printf
+   format string.  */
+gpg_error_t
+print_assuan_status (assuan_context_t ctx,
+                     const char *keyword,
+                     const char *format, ...)
+{
+  va_list arg_ptr;
+  int rc;
+  char *buf;
+
+  va_start (arg_ptr, format);
+  rc = estream_vasprintf (&buf, format, arg_ptr);
+  va_end (arg_ptr);
+  if (rc < 0)
+    return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
+  rc = assuan_write_status (ctx, keyword, buf);
+  xfree (buf);
+  return rc;
+}