Add more advanced debug macro

Make it possible to have multiple debug levels. This makes it possible
to remove unneeded (debug) output when user is not interested in
seeing the output.

Signed-off-by: Timo Kokkonen <timo.t.kokkonen@iki.fi>

diff --git a/Makefile b/Makefile
index e02d333be42a162c531835aacd3296b72fa7792e..9ccc202bf760f9f802e4c6bd47fdc9c2703a1d33 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ CC=gcc
 LD=ld
 CFLAGS=-Wall -O2 -g -fPIC
 
-LOG-PLOTTER_OBJS = baud.o main.o options.o
+LOG-PLOTTER_OBJS = baud.o main.o options.o debug.o
 
 ALL_OBJS = $(LOG-PLOTTER_OBJS)
 ALL_DEBS = $(patsubst %.o,.%.o.d,$(ALL_OBJS))

diff --git a/debug.c b/debug.c
new file mode 100644 (file)
index 0000000..dc89f6d
--- /dev/null
+++ b/debug.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "debug.h"
+
+int trace_level = TRACE_INFO;
+
+void print_trace(const char *file, int line, int l,
+               const char *fmt, ...)
+{
+       FILE *out_file;
+        va_list args;
+
+       if (l > trace_level)
+               return;
+
+       if (l == TRACE_ERR)
+               out_file = stderr;
+       else
+               out_file = stdout;
+
+        va_start(args, fmt);
+       vfprintf(out_file, fmt, args);
+        va_end(args);
+}

diff --git a/debug.h b/debug.h
new file mode 100644 (file)
index 0000000..1b327e0
--- /dev/null
+++ b/debug.h
@@ -0,0 +1,23 @@
+#ifndef __DEBUG_H
+#define __DEBUG_H
+
+extern int trace_level;
+
+enum {
+       TRACE_ERR = 1,
+       TRACE_WARN,
+       TRACE_INFO,
+       TRACE_DEBUG,
+       TRACE_MAX,
+};
+
+void  __attribute__ ((__format__ (__printf__, 4, 5)))
+print_trace(const char *file, int line, int l,
+               const char *fmt, ...);
+
+#define pr_err(arg...)   print_trace(__FILE__, __LINE__, TRACE_ERR, arg)
+#define pr_warn(arg...)  print_trace(__FILE__, __LINE__, TRACE_WARN, arg)
+#define pr_info(arg...)  print_trace(__FILE__, __LINE__, TRACE_INFO, arg)
+#define pr_debug(arg...) print_trace(__FILE__, __LINE__, TRACE_DEBUG, arg)
+
+#endif