--- Libc/Libc-763.13/stdio/FreeBSD/flags.c
+++ Libc/Libc-1669.0.4/stdio/FreeBSD/flags.c
@@ -49,9 +49,7 @@
  * Return 0 on error.
  */
 int
-__sflags(mode, optr)
-	const char *mode;
-	int *optr;
+__sflags(const char *mode, int *optr)
 {
 	int ret, m, o;
 
@@ -81,10 +79,17 @@
 	}
 
 	/* [rwa]\+ or [rwa]b\+ means read and write */
-	if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
+	if (*mode == 'b')
+		mode++;
+	if (*mode == '+') {
 		ret = __SRW;
 		m = O_RDWR;
+		mode++;
+		if (*mode == 'b')
+			mode++;
 	}
+	if (*mode == 'x')
+		o |= O_EXCL;
 	*optr = m | o;
 	return (ret);
 }