network: Don't redefine error codes if they already exist in errno.h

Since the errno.h values don't match the error codes that winsock
returns, map the winsock error codes to the errno ones, to make
sure explicit checks against AVERROR(x) match.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/network.c

@@ -164,6 +164,14 @@ int ff_neterrno(void)
         return AVERROR(EAGAIN);
     case WSAEINTR:
         return AVERROR(EINTR);
+    case WSAEPROTONOSUPPORT:
+        return AVERROR(EPROTONOSUPPORT);
+    case WSAETIMEDOUT:
+        return AVERROR(ETIMEDOUT);
+    case WSAECONNREFUSED:
+        return AVERROR(ECONNREFUSED);
+    case WSAEINPROGRESS:
+        return AVERROR(EINPROGRESS);
     }
     return -err;
 }

libavformat/network.h

@@ -35,10 +35,19 @@
 #include <winsock2.h>
 #include <ws2tcpip.h>
 
+#ifndef EPROTONOSUPPORT
 #define EPROTONOSUPPORT WSAEPROTONOSUPPORT
+#endif
+#ifndef ETIMEDOUT
 #define ETIMEDOUT       WSAETIMEDOUT
+#endif
+#ifndef ECONNREFUSED
 #define ECONNREFUSED    WSAECONNREFUSED
+#endif
+#ifndef EINPROGRESS
 #define EINPROGRESS     WSAEINPROGRESS
+#endif
+
 #define getsockopt(a, b, c, d, e) getsockopt(a, b, c, (char*) d, e)
 #define setsockopt(a, b, c, d, e) setsockopt(a, b, c, (const char*) d, e)