(main, intr, handleintr, termio): Do the right thing for Windows so ^C

aborts to the current command, as it should.  From Ron Koenderink.

src/client/handle.c

@@ -34,6 +34,8 @@
 
 #if !defined(_WIN32)
 #include <unistd.h>
+#else
+#include <winsock.h>
 #endif
 #include "misc.h"
 
@@ -42,7 +44,11 @@ handleintr(int s)
 {
     if (interrupt) {
 	/* tacky, but it works */
+#if !defined(_WIN32)
 	if (write(s, "\naborted\n", 1 + 7 + 1) <= 0)
+#else
+	if (send(s, "\naborted\n", 1 + 7 + 1, 0) <= 0)
+#endif
 	    return 0;
 	interrupt = 0;
     }

src/client/main.c

@@ -250,6 +250,11 @@ main(int ac, s_char **av)
 	FD_SET(sock, &readfds);
 	n = select(sock + 1, &readfds, (fd_set *) 0, (fd_set *) 0,
 		   (struct timeval *)&tm);
+	if (interrupt) {
+	    if (!handleintr(sock))
+		break;
+	    errno = 0;
+	}
 	if (n < 0) {
 	    if (errno == EINTR) {
 		errno = WSAGetLastError();
@@ -288,6 +293,9 @@ static void
 intr(int sig)
 {
     interrupt++;
+#ifdef _WIN32
+    signal(SIGINT, intr);
+#endif
 #ifdef hpux
     signal(SIGINT, intr);
 #endif

src/client/termio.c

@@ -98,6 +98,7 @@ termio(int fd, int sock, FILE *auxfi)
 	    }
 	}
 	FlushConsoleInputBuffer(hStdIn);
+	if (n == 0) return 1;
     } else {
 	n = read(fd, p, sizeof(buf) - i);
     }