2 files changed, 103 insertions, 0 deletions
diff --git a/src/trace.c b/src/trace.c
new file mode 100644
index 0000000..b37da2f
--- /dev/null
+++ b/src/trace.c
@@ -0,0 +1,73 @@
+#include "config.h"
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <threads.h>
+
+#include "trace.h"
+
+
+
+thread_local enum TraceLevel
+TRACE_LEVEL = TraceLevel_INFO;
+
+thread_local FILE *
+TRACE_OUTPUT = NULL;
+
+
+
+void
+set_level(const enum TraceLevel level) {
+	assert(level >= TraceLevel_NONE);
+	assert(level <= TraceLevel_ERROR);
+	TRACE_LEVEL = level;
+}
+
+void
+set_output(FILE *stream) {
+	TRACE_OUTPUT = stream;
+}
+
+int
+vtrace(
+	const char *const file,
+	const char *const function,
+	const int lineno,
+	const enum TraceLevel level,
+	const char *restrict format,
+	...
+) {
+	int rc = 0;
+
+	// FIXME: test
+	if (level < TRACE_LEVEL) {
+		return rc;
+	}
+
+	if (TRACE_OUTPUT == NULL) {
+		TRACE_OUTPUT = stderr;
+	}
+
+	// FIXME: weavify!
+	if (fprintf(TRACE_OUTPUT, "%s:%s:%d: ", file, function, lineno) < 0) {
+		perror(__FILE__ ":vtrace(): fprintf() < 0");
+		rc = -1;
+	}
+
+	va_list args;
+	va_start(args, format);
+	if (vfprintf(TRACE_OUTPUT, format, args) < 0) {
+		perror(__FILE__ ":vtrace(): vfprintf() < 0");
+		rc = -1;
+	}
+	va_end(args);
+
+	if (fprintf(TRACE_OUTPUT, "\n") < 0) {
+		perror(__FILE__ ":vtrace(): fprintf() < 0");
+		rc = -1;
+	}
+
+	return rc;
+}
diff --git a/src/trace.h b/src/trace.h
new file mode 100644
index 0000000..64e883a
--- /dev/null
+++ b/src/trace.h
@@ -0,0 +1,30 @@
+#define trace(level, ...) vtrace(__FILE__, __func__, __LINE__, level,              __VA_ARGS__)
+#define debug(...)        vtrace(__FILE__, __func__, __LINE__, TraceLevel_DEBUG,   __VA_ARGS__)
+#define info(...)         vtrace(__FILE__, __func__, __LINE__, TraceLevel_INFO,    __VA_ARGS__)
+#define warning(...)      vtrace(__FILE__, __func__, __LINE__, TraceLevel_WARNING, __VA_ARGS__)
+#define error(...)        vtrace(__FILE__, __func__, __LINE__, TraceLevel_ERROR,   __VA_ARGS__)
+
+
+
+enum TraceLevel {
+	TraceLevel_NONE    = 1,
+	TraceLevel_DEBUG   = 2,
+	TraceLevel_INFO    = 3,
+	TraceLevel_WARNING = 4,
+	TraceLevel_ERROR   = 5,
+};
+
+
+
+void
+set_level(const enum TraceLevel level);
+
+int
+vtrace(
+	const char *const file,
+	const char *const function,
+	const int lineno,
+	const enum TraceLevel level,
+	const char *restrict format,
+	...
+);