print to backend

1 files changed, 67 insertions, 0 deletions

diff --git a/backend/print.cpp b/backend/print.cpp
new file mode 100644
index 0000000..fc8ad9b
--- /dev/null
+++ b/backend/print.cpp
@@ -0,0 +1,67 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+
+#include "print.h"
+#include "util.h"
+
+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;
+}
+
+void lprtf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	String formatted = String::va_fmt(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 = String::fmt("%lu.log", getpid());
+	FILE * file = fopen(filename.c_str(), "w+");
+}
+
+SessionLog::~SessionLog() {
+	safe_free(this->file);
+}
+
+void SessionLog::append(const String & str) const {
+	this->append(str.data(), str.size());
+}
+
+void SessionLog::append(const char * str) const {
+	this->append(str, strlen(str));
+}
+
+void SessionLog::append(const char * buf, size_t buf_size) const {
+	if (this->file == nullptr) return;
+	if (buf_size == 0) return;
+	fwrite(buf, 1, buf_size, this->file);
+}
+