sync code with last improvements from OpenBSD

app/fvwm/libs/debug.c

@@ -0,0 +1,48 @@
+/* File:    debug.c
+ *
+ * Description:
+ *      Implement some debugging/log functions that can be used generically
+ *      by all of fvwm + modules.
+ *
+ * Created:
+ *       6 Nov 1998 - Paul D. Smith <psmith@BayNetworks.com>
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "fvwmlib.h"
+
+#ifndef HAVE_VFPRINTF
+# define VA_PRINTF(fp, lastarg, args) _doprnt((lastarg), (args), (fp))
+#else
+# define VA_PRINTF(fp, lastarg, args) vfprintf((fp), (lastarg), (args))
+#endif
+
+/* Don't put this into the #ifdef, since some compilers don't like completely
+ * empty source files.
+ */
+int f_db_level = 0;
+
+
+#ifdef DEBUG
+
+struct f_db_info f_db_info;
+
+void
+f_db_print(const char *fmt, ...)
+{
+  va_list ap;
+
+  fprintf(stderr, "%s:%ld: ", f_db_info.filenm, f_db_info.lineno);
+
+  va_start(ap, fmt);
+  VA_PRINTF(stderr, fmt, ap);
+  va_end(ap);
+
+  fputc('\n', stderr);
+}
+
+#endif