Upstream vwifi v7.0 (Raizo62/vwifi @ 4a9842e)

Unmodified upstream source from https://github.com/Raizo62/vwifi
Commit: 4a9842e "CMakeLists.txt : VERSION = 7.0"

Simulator of WiFi (802.11) interfaces to communicate between
several Virtual Machines via mac80211_hwsim + TCP relay.

License: Apache-2.0

src/tools.cc

@@ -0,0 +1,71 @@
+#include <cstddef> // NULL
+#include <arpa/inet.h> // struct sockaddr_in & inet_ntoa & ntohs
+
+#include "tools.h"
+
+#include <assert.h> // assert
+
+bool HashUsesPort=false;
+
+unsigned long hash_ipaddr(struct sockaddr_in* addr)
+{
+	unsigned long res;
+
+	assert( addr != NULL );
+
+	res = (((addr->sin_addr.s_addr >> 24) & 0xff) * 256)	+
+			(((addr->sin_addr.s_addr >> 16) & 0xff) * 256)	+
+			(((addr->sin_addr.s_addr >>  8) & 0xff)* 256)	+
+			(addr->sin_addr.s_addr & 0xff);
+
+	if( HashUsesPort )
+		res += addr->sin_port;
+
+	return res;
+}
+
+bool isInt(const char *str) {
+
+	if( *str == '-' || *str == '+' )
+		str++;
+
+	while (*str) {
+		if( *str < '0' || *str > '9' )
+			return false;
+		str++;
+	}
+	return true;
+}
+
+bool isPositiveInt(const char *str)
+{
+	if( *str == '-' )
+		return false;
+
+	return isInt(str);
+}
+
+bool isIntOrFloat(const char *str) {
+	bool seeDot=false;
+	bool seeDigit=false;
+
+	if (*str == '-' || *str == '+')
+		str++;
+
+	while (*str) {
+		if( *str == '.' )
+		{
+			if( seeDot )
+				return false;
+			seeDot=true;
+		}
+		else
+		{
+			if( *str < '0' || *str > '9' )
+				return false;
+			seeDigit=true;
+		}
+		str++;
+	}
+	return seeDigit;
+}