Updates to use sockets on mingw

Add missing WSAStartup() and WSACleanup() code required
on windows to use ws2_32 library.

Also, O_NONBLOCK is tricky even on other platforms so create
a function to set that so portability logic doesn't need to be
done in every backend.  Windows requires using a non standard
function to enable nonblocking mode and also doesn't support
querying current state.

include/sane/sanei_udp.h

@@ -31,6 +31,7 @@
 extern SANE_Status sanei_udp_open(const char *host, int port, int *fdp);
 extern SANE_Status sanei_udp_open_broadcast(int *fdp);
 extern void sanei_udp_close(int fd);
+extern void sanei_udp_set_nonblock(int fd, SANE_Bool nonblock);
 extern ssize_t sanei_udp_write(int fd, const u_char * buf, int count);
 extern ssize_t sanei_udp_read(int fd, u_char * buf, int count);
 extern ssize_t sanei_udp_write_broadcast(int fd, int port, const u_char * buf, int count);

sanei/sanei_tcp.c

@@ -65,10 +65,19 @@ sanei_tcp_open(const char *host, int port, int *fdp)
 	int fd, err;
 	struct sockaddr_in saddr;
 	struct hostent *h;
+#ifdef HAVE_WINSOCK2_H
+	WSADATA wsaData;
+#endif
 
 	DBG_INIT();
 	DBG(1, "%s: host = %s, port = %d\n", __FUNCTION__, host, port);
 
+#ifdef HAVE_WINSOCK2_H
+	err = WSAStartup(MAKEWORD(2, 2), &wsaData);
+	if (err != 0)
+	    return SANE_STATUS_INVAL;
+#endif
+
 	h = gethostbyname(host);
 
 	if (h == NULL || h->h_addr_list[0] == NULL
@@ -100,6 +109,9 @@ void
 sanei_tcp_close(int fd)
 {
 	close(fd);
+#ifdef HAVE_WINSOCK2_H
+	WSACleanup();
+#endif
 }
 
 ssize_t

sanei/sanei_udp.c

@@ -115,10 +115,19 @@ SANE_Status
 sanei_udp_open(const char *host, int port, int *fdp)
 {
 	int status;
+#ifdef HAVE_WINSOCK2_H
+	WSADATA wsaData;
+#endif
 
 	DBG_INIT();
 	DBG(1, "%s\n", __func__);
 
+#ifdef HAVE_WINSOCK2_H
+	status = WSAStartup(MAKEWORD(2, 2), &wsaData);
+	if (status != 0)
+	    return SANE_STATUS_INVAL;
+#endif
+
 	status = sanei_udp_socket(fdp, 0);
 	if (status != SANE_STATUS_GOOD)
 		return status;
@@ -151,6 +160,9 @@ void
 sanei_udp_close(int fd)
 {
 	close(fd);
+#ifdef HAVE_WINSOCK2_H
+	WSACleanup();
+#endif
 }
 
 ssize_t
@@ -174,6 +186,25 @@ sanei_udp_write_broadcast(int fd, int port, const u_char * buf, int count)
 		(struct sockaddr *)&saddr, sizeof(saddr));
 }
 
+void
+sanei_udp_set_nonblock(int fd, SANE_Bool nonblock)
+{
+#ifdef HAVE_WINSOCK2_H
+	u_long mode=nonblock;
+
+	ioctlsocket(fd, FIONBIO, &mode);
+#else
+	long flags;
+
+	save_flags = flags = fcntl(fd, F_GETFL, 0L);
+	if (nonblock)
+		flags |= O_NONBLOCK;
+	else
+		flags &= ~O_NONBLOCK;
+	fcntl(fd, F_SETFL, flags);
+#endif
+}
+
 ssize_t
 sanei_udp_read(int fd, u_char * buf, int count)
 {