Initial revision

include/sane/sanei_debug.h

@@ -0,0 +1,51 @@
+#include <sane/sanei.h>
+
+#define ENTRY(name)	PASTE(PASTE(PASTE(sane_,BACKEND_NAME),_),name)
+
+/* The cpp that comes with GNU C 2.5 seems to have troubles understanding
+   vararg macros.  */
+#if __GNUC__ - 0 > 2 || (__GNUC__ - 0 == 2 && __GNUC_MINOR__ > 5)
+# define HAVE_VARARG_MACROS
+#endif
+
+#ifndef HAVE_VARARG_MACROS
+  extern void sanei_debug (int level, const char *msg, ...);
+#endif
+
+#ifdef NDEBUG
+# define DBG_INIT(backend, var)
+# ifdef HAVE_VARARG_MACROS
+#  define DBG(level, msg, args...)
+# else
+#  define DBG		if (0) sanei_debug
+# endif
+#  define IF_DBG(x)
+#else
+# include <stdio.h>
+
+#define DBG_LEVEL	PASTE(sanei_debug_,BACKEND_NAME)
+
+#if defined(BACKEND_NAME) && !defined(STUBS)
+int PASTE(sanei_debug_,BACKEND_NAME);
+#endif
+
+# define DBG_INIT()					\
+  sanei_init_debug (STRINGIFY(BACKEND_NAME),		\
+		    &PASTE(sanei_debug_,BACKEND_NAME))
+
+/* The cpp that comes with GNU C 2.5 seems to have troubles understanding
+   vararg macros.  */
+#ifdef HAVE_VARARG_MACROS
+# define DBG(level, msg, args...)					\
+  do {									\
+    if (DBG_LEVEL >= (level))			\
+      fprintf (stderr, "[" STRINGIFY(BACKEND_NAME) "] " msg, ##args);	\
+  } while (0)
+
+  extern void sanei_init_debug (const char * backend, int * debug_level_var);
+#else
+# define DBG		sanei_debug
+#endif
+
+# define IF_DBG(x)	x
+#endif