create backend string class

1 files changed, 65 insertions, 0 deletions

diff --git a/backend/String.cpp b/backend/String.cpp
new file mode 100644
index 0000000..2b40c88
--- /dev/null
+++ b/backend/String.cpp
@@ -0,0 +1,65 @@
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "String.h"
+#include "util.h"
+
+String::String() {
+	this->set("");
+}
+
+String::String(const String & other) {
+	this->set(other.data(), other.size());
+}
+
+String::String(const char * c_str) {
+	if (c_str == nullptr) c_str = "";
+	this->set(c_str);
+}
+
+String String::fmt(const char * fmt, ...) {
+	String out;
+	va_list args, args_copy;
+	va_start(args, fmt);
+
+	va_copy(args_copy, args);
+	out._data_len = vsnprintf(NULL, 0, fmt, args_copy);
+	va_end(args_copy);
+
+	out._data = static_cast<char *>(malloc(out._data_len + 1));
+	vsnprintf(out._data, out._data_len + 1, fmt, args);
+	va_end(args);
+	return out;
+}
+
+String::~String() {
+	safe_free(this->_data);
+}
+
+void String::set(const char * data) {
+	this->set(data, strlen(data));
+}
+
+void String::set(const char * data, size_t data_len) {
+	safe_free(this->_data);
+	this->_data = static_cast<char *>(malloc(data_len + 1));
+	this->_data_len = data_len;
+	memcpy(this->_data, data, data_len);
+	this->_data[this->_data_len] = '\0';
+}
+
+const char * String::c_str() const {
+	return this->_data;
+}
+char * String::data() const {
+	return this->_data;
+}
+size_t String::size() const {
+	return this->_data_len;
+}
+bool String::empty() const {
+	return this->_data_len == 0;
+}
+