[libxml2] Don't redefine socket error codes on Windows

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 5b2324b6e007b5a03e4131877ab09f4dc8037e59
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Oct 9 00:05:04 2017 +0200

    Don't redefine socket error codes on Windows
    
    Translate WSA error codes instead of blindly redefining POSIX error
    codes on Windows. The redefinitions caused warnings in modern Windows
    environments, but simply ifdef'ing out the redefinitions seems like
    the wrong approach.

 include/wsockcompat.h |   67 +++++++++++-------------------------------------
 nanohttp.c            |   18 +++++++++++-
 2 files changed, 32 insertions(+), 53 deletions(-)
---
diff --git a/include/wsockcompat.h b/include/wsockcompat.h
index e6a1a99..cd73208 100644
--- a/include/wsockcompat.h
+++ b/include/wsockcompat.h
@@ -8,7 +8,7 @@
 #ifdef _WIN32_WCE
 #include <winsock.h>
 #else
-#undef HAVE_ERRNO_H
+#include <errno.h>
 #include <winsock2.h>
 
 /* the following is a workaround a problem for 'inline' keyword in said
@@ -27,60 +27,25 @@
 #endif
 #endif
 
-#if defined( __MINGW32__ ) || defined( _MSC_VER )
-/* Include <errno.h> here to ensure that it doesn't get included later
- * (e.g. by iconv.h) and overwrites the definition of EWOULDBLOCK. */
-#include <errno.h>
-#undef EWOULDBLOCK
-#endif
-
 #if !defined SOCKLEN_T
 #define SOCKLEN_T int
 #endif
 
-#define EWOULDBLOCK             WSAEWOULDBLOCK
-#define ESHUTDOWN               WSAESHUTDOWN
 
-#if (!defined(_MSC_VER) || (_MSC_VER < 1600))
-#define EINPROGRESS             WSAEINPROGRESS
-#define EALREADY                WSAEALREADY
-#define ENOTSOCK                WSAENOTSOCK
-#define EDESTADDRREQ            WSAEDESTADDRREQ
-#define EMSGSIZE                WSAEMSGSIZE
-#define EPROTOTYPE              WSAEPROTOTYPE
-#define ENOPROTOOPT             WSAENOPROTOOPT
-#define EPROTONOSUPPORT         WSAEPROTONOSUPPORT
-#define ESOCKTNOSUPPORT         WSAESOCKTNOSUPPORT
-#define EOPNOTSUPP              WSAEOPNOTSUPP
-#define EPFNOSUPPORT            WSAEPFNOSUPPORT
-#define EAFNOSUPPORT            WSAEAFNOSUPPORT
-#define EADDRINUSE              WSAEADDRINUSE
-#define EADDRNOTAVAIL           WSAEADDRNOTAVAIL
-#define ENETDOWN                WSAENETDOWN
-#define ENETUNREACH             WSAENETUNREACH
-#define ENETRESET               WSAENETRESET
-#define ECONNABORTED            WSAECONNABORTED
-#define ECONNRESET              WSAECONNRESET
-#define ENOBUFS                 WSAENOBUFS
-#define EISCONN                 WSAEISCONN
-#define ENOTCONN                WSAENOTCONN
-#define ETOOMANYREFS            WSAETOOMANYREFS
-#define ETIMEDOUT               WSAETIMEDOUT
-#define ECONNREFUSED            WSAECONNREFUSED
-#define ELOOP                   WSAELOOP
-#define EHOSTDOWN               WSAEHOSTDOWN
-#define EHOSTUNREACH            WSAEHOSTUNREACH
-#define EPROCLIM                WSAEPROCLIM
-#define EUSERS                  WSAEUSERS
-#define EDQUOT                  WSAEDQUOT
-#define ESTALE                  WSAESTALE
-#define EREMOTE                 WSAEREMOTE
-/* These cause conflicts with the codes from errno.h. Since they are 
-   not used in the relevant code (nanoftp, nanohttp), we can leave 
-   them disabled.
-#define ENAMETOOLONG            WSAENAMETOOLONG
-#define ENOTEMPTY               WSAENOTEMPTY
-*/
-#endif /* _MSC_VER */
+#ifndef ECONNRESET
+#define ECONNRESET WSAECONNRESET
+#endif
+#ifndef EINPROGRESS
+#define EINPROGRESS WSAEINPROGRESS
+#endif
+#ifndef EINTR
+#define EINTR WSAEINTR
+#endif
+#ifndef ESHUTDOWN
+#define ESHUTDOWN WSAESHUTDOWN
+#endif
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#endif
 
 #endif /* __XML_WSOCKCOMPAT_H__ */
diff --git a/nanohttp.c b/nanohttp.c
index 0533102..8a2b408 100644
--- a/nanohttp.c
+++ b/nanohttp.c
@@ -182,7 +182,21 @@ xmlHTTPErrMemory(const char *extra)
  */
 static int socket_errno(void) {
 #ifdef _WINSOCKAPI_
-    return(WSAGetLastError());
+    int err = WSAGetLastError();
+    switch(err) {
+        case WSAECONNRESET:
+            return(ECONNRESET);
+        case WSAEINPROGRESS:
+            return(EINPROGRESS);
+        case WSAEINTR:
+            return(EINTR);
+        case WSAESHUTDOWN:
+            return(ESHUTDOWN);
+        case WSAEWOULDBLOCK:
+            return(EWOULDBLOCK);
+        default:
+            return(err);
+    }
 #else
     return(errno);
 #endif
@@ -629,7 +643,7 @@ xmlNanoHTTPRecv(xmlNanoHTTPCtxtPtr ctxt)
 
         if ((select(ctxt->fd + 1, &rfd, NULL, NULL, &tv) < 1)
 #if defined(EINTR)
-            && (errno != EINTR)
+            && (socket_errno() != EINTR)
 #endif
             )
             return (0);