Add tracing functions for debugging

1 files changed, 41 insertions, 0 deletions

diff --git a/trace.c b/trace.c
new file mode 100644
index 0000000..456d277
--- /dev/null
+++ b/trace.c
@@ -0,0 +1,41 @@
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "pack.h"
+#include "trace.h"
+
+enum pack_trace pack_trace = PACK_TRACE_OFF;
+
+void trace(enum pack_trace level, const char *fmt, va_list va)
+{
+	char *type;
+
+	if (level > pack_trace) return;
+
+	switch (level) {
+	case PACK_TRACE_CALL: type = "CALL"; break;
+	case PACK_TRACE_DEBUG: type = "DEBUG"; break;
+	}
+
+	fprintf(stderr, "PACK_TRACE_%s: ", type);
+	vfprintf(stderr, fmt, va);
+	fputc('\n', stderr);
+}
+
+void tr_call(const char *fmt, ...)
+{
+	va_list va;
+
+	va_start(va, fmt);
+	trace(PACK_TRACE_CALL, fmt, va);
+	va_end(va);
+}
+
+void tr_debug(const char *fmt, ...)
+{
+	va_list va;
+
+	va_start(va, fmt);
+	trace(PACK_TRACE_DEBUG, fmt, va);
+	va_end(va);
+}