From 88ff582fd8f94dd8ba751142f12bc048815ae20e Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 22 Oct 2014 14:55:57 -0200
Subject: [PATCH] detail (using 'sizeof' instead of 'strlen' for length of a
 constant string)

---
 liolib.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/liolib.c b/liolib.c
index d03c99d7..863cd2b1 100644
--- a/liolib.c
+++ b/liolib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 2.134 2014/10/17 19:17:55 roberto Exp roberto $
+** $Id: liolib.c,v 2.135 2014/10/22 11:44:20 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -135,6 +135,7 @@
 
 
 #define IO_PREFIX	"_IO_"
+#define IOPREF_LEN	(sizeof(IO_PREFIX)/sizeof(char) - 1)
 #define IO_INPUT	(IO_PREFIX "input")
 #define IO_OUTPUT	(IO_PREFIX "output")
 
@@ -290,7 +291,7 @@ static FILE *getiofile (lua_State *L, const char *findex) {
   lua_getfield(L, LUA_REGISTRYINDEX, findex);
   p = (LStream *)lua_touserdata(L, -1);
   if (isclosed(p))
-    luaL_error(L, "standard %s file is closed", findex + strlen(IO_PREFIX));
+    luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN);
   return p->f;
 }