1 files changed, 22 insertions, 0 deletions
diff --git a/pc/gawkmisc.pc b/pc/gawkmisc.pc
index 43f81ff9..64b42396 100644
--- a/pc/gawkmisc.pc
+++ b/pc/gawkmisc.pc
@@ -547,6 +547,28 @@ usleep(unsigned int usec)
   return usec - msecf * 1000 < 0 ? 0 : (int)(usec - msecf * 1000);
 }
 
+/* The implementation of wctob in the MS runtime is problematic
+   because it doesn't allow to distinguish between WEOF and 0xff, due
+   to integer sign extension.  It also causes failures in dfa.c when
+   characters with the 8th bit set are involved.  This replacement
+   version fixes that.  */
+
+#include <wchar.h>
+
+int
+wctob (wint_t wc)
+{
+  char buf[64];
+
+  if (!(MB_CUR_MAX <= sizeof (buf)))
+    abort ();
+  /* Handle the case where WEOF is a value that does not fit in a wchar_t.  */
+  if (wc == (wchar_t)wc)
+    if (wctomb (buf, (wchar_t)wc) == 1)
+      return (unsigned char) buf[0];
+  return EOF;
+}
+
 #endif	/* __MINGW32__ */
 
 #ifdef __DJGPP__