Added utility functions for string/int conversion

fhessel · fhessel · commit 65fb3a17c4f7 · 2017-12-17T22:40:41.000+01:00
diff --git a/https/util.cpp b/https/util.cpp
@@ -0,0 +1,56 @@
+/*
+ * util.cpp
+ *
+ *  Created on: Dec 17, 2017
+ *      Author: frank
+ */
+
+
+#include "util.hpp"
+
+namespace httpsserver {
+
+int parseInt(std::string s) {
+	int i = 0; // value
+	int m = 1; // multiplier
+
+	// Check sign
+	size_t x = 0;
+	if (s[0]=='-') {
+
+		x = 1;
+	} else if (s[0]=='+') {
+		x = 1;
+	}
+
+	// Convert by base 10
+	for(; x < s.size(); x++) {
+		char c = s[x];
+		if (c >= '0' && c<='9') {
+			i = i*10 + (c-'0');
+		} else {
+			break;
+		}
+	}
+
+	// Combine both.
+	return m*i;
+}
+
+std::string intToString(int i) {
+	// We need this much digits
+	int digits = ceil(log10(i));
+	char c[digits+1];
+	c[digits] = '\0';
+
+	for(int x = digits-1; x >= 0; x--) {
+		char v = (i%10);
+		c[x] = '0' + v;
+		i = (i-v)/10;
+	}
+
+	return std::string(c);
+}
+
+
+}
diff --git a/https/util.hpp b/https/util.hpp
@@ -0,0 +1,24 @@
+/*
+ * util.h
+ *
+ *  Created on: Dec 17, 2017
+ *      Author: frank
+ */
+
+#ifndef HTTPS_UTIL_HPP_
+#define HTTPS_UTIL_HPP_
+
+#include <Arduino.h>
+
+#include <cmath>
+#include <string>
+
+namespace httpsserver {
+
+int parseInt(std::string s);
+
+std::string intToString(int i);
+
+}
+
+#endif /* HTTPS_UTIL_HPP_ */
