1 files changed, 40 insertions, 19 deletions
diff --git a/win/tclWinError.c b/win/tclWinError.c
index a74d2e2..49eeed3 100644
--- a/win/tclWinError.c
+++ b/win/tclWinError.c
@@ -11,13 +11,11 @@
  */
 
 #include "tclInt.h"
-#include "tclPort.h"
-
 /*
  * The following table contains the mapping from Win32 errors to errno errors.
  */
 
-static CONST unsigned char errorTable[] = {
+static const unsigned char errorTable[] = {
     0,
     EINVAL,	/* ERROR_INVALID_FUNCTION	1 */
     ENOENT,	/* ERROR_FILE_NOT_FOUND		2 */
@@ -293,8 +291,8 @@ static CONST unsigned char errorTable[] = {
  * errno errors.
  */
 
-static CONST int wsaErrorTable[] = {
-    EWOULDBLOCK,	/* WSAEWOULDBLOCK */
+static const unsigned char wsaErrorTable[] = {
+    EAGAIN,		/* WSAEWOULDBLOCK */
     EINPROGRESS,	/* WSAEINPROGRESS */
     EALREADY,		/* WSAEALREADY */
     ENOTSOCK,		/* WSAENOTSOCK */
@@ -364,39 +362,62 @@ TclWinConvertError(
 	Tcl_SetErrno(errorTable[errCode]);
     }
 }
-
+
+#ifdef __CYGWIN__
 /*
  *----------------------------------------------------------------------
  *
- * TclWinConvertWSAError --
+ * tclWinDebugPanic --
  *
- *	This routine converts a WinSock error into an errno value.
+ *	Display a message. If a debugger is present, present it directly to
+ *	the debugger, otherwise send it to stderr.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	Sets the errno global variable.
+ *	None.
  *
  *----------------------------------------------------------------------
  */
 
 void
-TclWinConvertWSAError(
-    DWORD errCode)		/* Win32 error code. */
+tclWinDebugPanic(
+    const char *format, ...)
 {
-    if (errCode >= sizeof(errorTable)/sizeof(errorTable[0])) {
-	errCode -= WSAEWOULDBLOCK;
-	if (errCode >= sizeof(wsaErrorTable)/sizeof(wsaErrorTable[0])) {
-	    Tcl_SetErrno(errorTable[1]);
-	} else {
-	    Tcl_SetErrno(wsaErrorTable[errCode]);
+#define TCL_MAX_WARN_LEN 1024
+    va_list argList;
+    va_start(argList, format);
+
+    if (IsDebuggerPresent()) {
+	WCHAR msgString[TCL_MAX_WARN_LEN];
+	char buf[TCL_MAX_WARN_LEN * TCL_UTF_MAX];
+
+	vsnprintf(buf, sizeof(buf), format, argList);
+	msgString[TCL_MAX_WARN_LEN-1] = L'\0';
+	MultiByteToWideChar(CP_UTF8, 0, buf, -1, msgString, TCL_MAX_WARN_LEN);
+
+	/*
+	 * Truncate MessageBox string if it is too long to not overflow the buffer.
+	 */
+
+	if (msgString[TCL_MAX_WARN_LEN-1] != L'\0') {
+	    memcpy(msgString + (TCL_MAX_WARN_LEN - 5), L" ...", 5 * sizeof(WCHAR));
 	}
+	OutputDebugStringW(msgString);
     } else {
-	Tcl_SetErrno(errorTable[errCode]);
+	vfprintf(stderr, format, argList);
+	fprintf(stderr, "\n");
+	fflush(stderr);
     }
+#   if defined(__GNUC__)
+    __builtin_trap();
+#   else
+    DebugBreak();
+#   endif
+    abort();
 }
-
+#endif
 /*
  * Local Variables:
  * mode: c