core: Simplify the trace maros by using variadics.

* src/debug.h (TRACE_BEG, TRACE_LOG, TRACE_SUC): Use variadic macros
and remove the TRACE_BEG1 et al.  Change all users to always pass a
format string.
(TRACE): Ditto.
* src/debug.c (_gpgme_debugf): New.
* configure.ac <GCC>: Add -Wno-format-zero-length.
--

This makes it easier for use to enable format checks.  The zero-length
format is required to allow for an empty format due to the comman
problematic of __VA_ARGS__.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 30 insertions, 135 deletions

diff --git a/src/debug.h b/src/debug.h
index 77fec559..9f9fd5df 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -69,6 +69,10 @@ void _gpgme_debug_subsystem_init (void);
 
 /* Log the formatted string FORMAT at debug level LEVEL or higher.  */
 int  _gpgme_debug (int level, const char *format, ...);
+int  _gpgme_debugf (int level, int mode,
+                    const char *func, const char *tagname, const char *tagvalue,
+                    const char *format, ...) GPGRT_ATTR_PRINTF(6,7);
+
 
 /* Start a new debug line in *LINE, logged at level LEVEL or higher,
    and starting with the formatted string FORMAT.  */
@@ -109,160 +113,51 @@ _gpgme_trace_gpgme_error (gpgme_error_t err, const char *file, int line)
   void *_gpgme_trace_tag = (void *) (uintptr_t) tag; \
   _gpgme_debug_frame_begin ()
 
-#define TRACE_BEG(lvl, name, tag)			   \
-  _TRACE (lvl, name, tag);				   \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag)
-#define TRACE_BEG0(lvl, name, tag, fmt)					\
-  _TRACE (lvl, name, tag);						\
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n",	\
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag)
-#define TRACE_BEG1(lvl, name, tag, fmt, arg1)				\
+#define TRACE_BEG(lvl, name, tag, ...)			   \
   _TRACE (lvl, name, tag);						\
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n",	\
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1)
-#define TRACE_BEG2(lvl, name, tag, fmt, arg1, arg2)		    \
-  _TRACE (lvl, name, tag);					    \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2)
-#define TRACE_BEG3(lvl, name, tag, fmt, arg1, arg2, arg3)	    \
-  _TRACE (lvl, name, tag);					    \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3)
-#define TRACE_BEG4(lvl, name, tag, fmt, arg1, arg2, arg3, arg4)	    \
-  _TRACE (lvl, name, tag);					    \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4)
-#define TRACE_BEG5(lvl, name, tag, fmt, arg1, arg2, arg3, arg4, arg5) \
-  _TRACE (lvl, name, tag);					    \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4, arg5)
-#define TRACE_BEG7(lvl, name, tag, fmt, arg1, arg2, arg3, arg4,	    \
-		   arg5, arg6, arg7)				    \
-  _TRACE (lvl, name, tag);					    \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4, arg5, arg6, arg7)
-#define TRACE_BEG8(lvl, name, tag, fmt, arg1, arg2, arg3, arg4,	    \
-		   arg5, arg6, arg7, arg8)			    \
-  _TRACE (lvl, name, tag);					    \
-  _gpgme_debug (_gpgme_trace_level, "%s: enter: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
-
-#define TRACE(lvl, name, tag)						\
-  _gpgme_debug_frame_begin (),						\
-  _gpgme_debug (lvl, "%s: call: %s=%p\n",				\
-		name, STRINGIFY (tag), (void *) (uintptr_t) tag),	\
-  _gpgme_debug_frame_end ()
-#define TRACE0(lvl, name, tag, fmt)					\
-  _gpgme_debug_frame_begin (),						\
-  _gpgme_debug (lvl, "%s: call: %s=%p, " fmt "\n",			\
-		name, STRINGIFY (tag), (void *) (uintptr_t) tag),	\
-  _gpgme_debug_frame_end ()
-#define TRACE1(lvl, name, tag, fmt, arg1)			       \
-  _gpgme_debug_frame_begin (),						\
-  _gpgme_debug (lvl, "%s: call: %s=%p, " fmt "\n",		       \
-		name, STRINGIFY (tag), (void *) (uintptr_t) tag, arg1), \
-  _gpgme_debug_frame_end ()
-#define TRACE2(lvl, name, tag, fmt, arg1, arg2)			       \
-  _gpgme_debug_frame_begin (),						\
-  _gpgme_debug (lvl, "%s: call: %s=%p, " fmt "\n",		       \
-		name, STRINGIFY (tag), (void *) (uintptr_t) tag, arg1, \
-		arg2), _gpgme_debug_frame_end ()
-#define TRACE3(lvl, name, tag, fmt, arg1, arg2, arg3)		       \
-  _gpgme_debug_frame_begin (),						\
-  _gpgme_debug (lvl, "%s: call: %s=%p, " fmt "\n",		       \
-		name, STRINGIFY (tag), (void *) (uintptr_t) tag, arg1, \
-		arg2, arg3), _gpgme_debug_frame_end ()
-#define TRACE6(lvl, name, tag, fmt, arg1, arg2, arg3, arg4, arg5, arg6)	\
+  _gpgme_debugf (_gpgme_trace_level, 1,                                 \
+                 _gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
+                  __VA_ARGS__)
+
+#define TRACE(lvl, name, tag, ...)                                      \
   _gpgme_debug_frame_begin (),						\
-  _gpgme_debug (lvl, "%s: call: %s=%p, " fmt "\n",			\
-		name, STRINGIFY (tag), (void *) (uintptr_t) tag, arg1, \
-		arg2, arg3, arg4, arg5, arg6),			       \
-  _gpgme_debug_frame_end ()
+    _gpgme_debugf (lvl, 0,                                              \
+                   name, STRINGIFY (tag), (void *) (uintptr_t) tag,     \
+                   __VA_ARGS__),                                        \
+    _gpgme_debug_frame_end ()
 
 #define TRACE_ERR(err)							\
-  err == 0 ? (TRACE_SUC ()) :						\
+  err == 0 ? (TRACE_SUC ("")) :						\
     (_gpgme_debug (_gpgme_trace_level, "%s:%d: error: %s <%s>\n",	\
 		   _gpgme_trace_func, __LINE__,  gpgme_strerror (err),  \
 		   gpgme_strsource (err)), _gpgme_debug_frame_end (), (err))
+
+
 /* The cast to void suppresses GCC warnings.  */
 #define TRACE_SYSRES(res)						\
-  res >= 0 ? ((void) (TRACE_SUC1 ("result=%i", res)), (res)) :		\
-    (_gpgme_debug (_gpgme_trace_level, "%s: error: %s\n",	\
-		   _gpgme_trace_func, strerror (errno)), _gpgme_debug_frame_end (), (res))
+  res >= 0 ? ((void) (TRACE_SUC ("result=%i", res)), (res)) :		\
+    (_gpgme_debug (_gpgme_trace_level, "%s: error: %s\n",               \
+		   _gpgme_trace_func, strerror (errno)),                \
+     _gpgme_debug_frame_end (), (res))
 #define TRACE_SYSERR(res)						\
-  res == 0 ? ((void) (TRACE_SUC1 ("result=%i", res)), (res)) :		\
+  res == 0 ? ((void) (TRACE_SUC ("result=%i", res)), (res)) :		\
     (_gpgme_debug (_gpgme_trace_level, "%s: error: %s\n",		\
 		   _gpgme_trace_func, strerror (res)),			\
      _gpgme_debug_frame_end (), (res))
 #define TRACE_SYSERR_NR(res)						\
-  do { res == 0 ? ((void) (TRACE_SUC1 ("result=%i", res)), (res)) :     \
+  do { res == 0 ? ((void) (TRACE_SUC ("result=%i", res)), (res)) :     \
     (_gpgme_debug (_gpgme_trace_level, "%s: error: %s\n",		\
 		   _gpgme_trace_func, strerror (res)),			\
      _gpgme_debug_frame_end ()); } while (0)
 
-#define TRACE_SUC()						 \
-  _gpgme_debug (_gpgme_trace_level, "%s: leave\n",       \
-		_gpgme_trace_func), _gpgme_debug_frame_end ()
-#define TRACE_SUC0(fmt)							\
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func), _gpgme_debug_frame_end ()
-#define TRACE_SUC1(fmt, arg1)						\
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func, arg1), _gpgme_debug_frame_end ()
-#define TRACE_SUC2(fmt, arg1, arg2)					\
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func, arg1, arg2), _gpgme_debug_frame_end ()
-#define TRACE_SUC3(fmt, arg1, arg2, arg3)                            \
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func, arg1, arg2, arg3), _gpgme_debug_frame_end ()
-#define TRACE_SUC4(fmt, arg1, arg2, arg3, arg4)			\
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func, arg1, arg2, arg3, arg4), \
-    _gpgme_debug_frame_end ()
-#define TRACE_SUC5(fmt, arg1, arg2, arg3, arg4, arg5)			\
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func, arg1, arg2, arg3, arg4, arg5), \
-    _gpgme_debug_frame_end ()
-#define TRACE_SUC6(fmt, arg1, arg2, arg3, arg4, arg5, arg6)	\
-  _gpgme_debug (_gpgme_trace_level, "%s: leave: " fmt "\n",	\
-		_gpgme_trace_func, arg1, arg2, arg3, arg4, arg5, arg6),	\
-    _gpgme_debug_frame_end ()
+#define TRACE_SUC(...)							\
+  _gpgme_debugf (_gpgme_trace_level, 3,	_gpgme_trace_func, NULL, NULL,  \
+                 __VA_ARGS__), _gpgme_debug_frame_end ()
 
-#define TRACE_LOG(fmt)							\
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n",	\
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag)
-#define TRACE_LOG1(fmt, arg1)						\
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n",	\
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1)
-#define TRACE_LOG2(fmt, arg1, arg2)				    \
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2)
-#define TRACE_LOG3(fmt, arg1, arg2, arg3)			    \
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3)
-#define TRACE_LOG4(fmt, arg1, arg2, arg3, arg4)			    \
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4)
-#define TRACE_LOG5(fmt, arg1, arg2, arg3, arg4, arg5)		    \
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4, arg5)
-#define TRACE_LOG6(fmt, arg1, arg2, arg3, arg4, arg5, arg6)	    \
-  _gpgme_debug (_gpgme_trace_level, "%s: check: %s=%p, " fmt "\n", \
-		_gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
-		arg1, arg2, arg3, arg4, arg5, arg6)
+#define TRACE_LOG(...)                                                  \
+  _gpgme_debugf (_gpgme_trace_level, 2,                                 \
+                 _gpgme_trace_func, _gpgme_trace_tagname, _gpgme_trace_tag, \
+                 __VA_ARGS__)
 
 #define TRACE_LOGBUF(buf, len)					\
   _gpgme_debug_buffer (_gpgme_trace_level, "%s: check: %s",	\