1 files changed, 73 insertions, 0 deletions
diff --git a/frontend/print.cpp b/frontend/print.cpp
new file mode 100644
index 0000000..396e9ad
--- /dev/null
+++ b/frontend/print.cpp
@@ -0,0 +1,73 @@
+#include <cstdarg>
+#include <string>
+#include <unistd.h>
+
+#include "print.h"
+
+using namespace std;
+
+static string va_stringf(va_list args, const char * fmt) {
+	va_list args_copy;
+	va_copy(args_copy, args);
+
+	size_t sz = vsnprintf(NULL, 0, fmt, args_copy) + 1;
+	char * msg = (char *) malloc(sz);
+	va_end(args_copy);
+
+	vsnprintf(msg, sz, fmt, args);
+
+	string out = msg;
+	free(msg);
+
+	va_end(args);
+
+	return out;
+}
+
+static string stringf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	string out = va_stringf(args, fmt);
+	va_end(args);
+	return out;
+}
+
+void lprtf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	string formatted = va_stringf(args, fmt);
+	va_end(args);
+
+	fwrite(formatted.c_str(), 1, formatted.size(), stdout);
+	fflush(stdout);
+
+	SessionLog::get().append(formatted);
+}
+
+SessionLog & SessionLog::get() {
+	static SessionLog instance;
+	return instance;
+}
+
+SessionLog::SessionLog() {
+	if (!this->enable) return;
+
+	string filename = stringf("%lu.log", getpid());
+	FILE * file = fopen(filename.c_str(), "w+");
+	this->file = { file, [] (FILE * file) { fclose(file); } };
+}
+
+void SessionLog::append(const string & str) {
+	this->append(str.data(), str.size());
+}
+
+void SessionLog::append(const char * str) {
+	this->append(str, strlen(str));
+}
+
+void SessionLog::append(const char * buf, size_t buf_size) {
+	if (this->file == nullptr) return;
+	if (buf_size == 0) return;
+	fwrite(buf, 1, buf_size, this->file.get());
+}
+