Switch to standard logging framework

adsbus/log.c

@@ -0,0 +1,30 @@
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "log.h"
+
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+
+static FILE *log_stream = NULL;
+
+void log_init() {
+	log_stream = fdopen(STDERR_FILENO, "a");
+	assert(log_stream);
+	setlinebuf(log_stream);
+}
+
+void log_cleanup() {
+	assert(!fclose(log_stream));
+}
+
+__attribute__ ((__format__ (__printf__, 3, 4)))
+void log_write(char type, const uint8_t *id, const char *fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	assert(fprintf(log_stream, "%c %s: ", type, id) > 0);
+	assert(vfprintf(log_stream, fmt, ap) > 0);
+	assert(fprintf(log_stream, "\n") == 1);
+	va_end(ap);
+}