add InetPton stub

src/win32shim.c

@@ -0,0 +1,40 @@
+/* Custom InetPton implementation */
+
+#include <Winsock2.h>
+#include <ws2tcpip.h>
+
+int __stdcall
+InetPton(int Family,
+         const char *pszAddrString,
+         void *pAddrBuf)
+{
+    IN_ADDR *addr = pAddrBuf;
+    unsigned long ulTmp;
+    
+    if (Family != AF_INET) {
+        // Oops! We don't support that addr family
+        WSASetLastError(WSAEAFNOSUPPORT);
+        return -1;
+    }
+
+    if (!pAddrBuf || !pszAddrString ||
+        pszAddrString[0] == '\0') {
+		WSASetLastError(WSAEFAULT);
+		return -1;
+    }
+
+	// Technically we could just put the return val directly
+	// into addr->S_un.S_addr, but I don't like writing bad
+	// data unless absolutely necessary. So store it in a temp
+	// variable, first.
+    ulTmp = inet_addr(pszAddrString);
+    if (ulTmp == INADDR_NONE) {
+		// Not an IP address
+		WSASetLastError(WSAEFAULT);
+		return -1;
+    }
+
+	// S_un.S_addr is an unsigned long. Easy!
+    addr->S_un.S_addr = ulTmp;
+    return 0;
+}