portability: use va_start and va_end in the same function.

[bison.git] / src / scan-gram.l

diff --git a/src/scan-gram.l b/src/scan-gram.l
index 683d58225b57e1fd664c87700517d2708a2fef6e..ee9f1174678667a285bf88d975fae0f8340fceb2 100644 (file)
--- a/src/scan-gram.l
+++ b/src/scan-gram.l
@@ -438,12 +438,9 @@ splice      (\\[ \f\t\v]*\n)*
   }
   \\(.|\n)     {
     char const *p = yytext + 1;
-    char quoted_ws[] = "` '";
-    if (isspace (*p) && isprint (*p))
-      {
-        quoted_ws[1] = *p;
-        p = quoted_ws;
-      }
+    /* Quote only if escaping won't make the character visible.  */
+    if (isspace ((unsigned char) *p) && isprint ((unsigned char) *p))
+      p = quote (p);
     else
       p = quotearg_style_mem (escape_quoting_style, p, 1);
     complain_at (*loc, _("invalid character after \\-escape: %s"), p);