lua

commit cbf0c7a103bd69a2b8d8a55f676cf7bb08058909
parent 4c399c5dfbb094d4bd151d49abd3d998ed1d757d
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date:   Tue,  3 Feb 2009 17:38:55 -0200

check for invalid use of '%' in replacement string in 'string.gsub'

Diffstat:
M
lstrlib.c
 | 
8
++++++--

1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/lstrlib.c b/lstrlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstrlib.c,v 1.140 2008/04/14 15:54:59 roberto Exp roberto $
+** $Id: lstrlib.c,v 1.141 2008/06/12 14:21:18 roberto Exp roberto $
 ** Standard library for string operations and pattern-matching
 ** See Copyright Notice in lua.h
 */
@@ -600,8 +600,12 @@ static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,
       luaL_addchar(b, news[i]);
     else {
       i++;  /* skip ESC */
-      if (!isdigit(uchar(news[i])))
+      if (!isdigit(uchar(news[i]))) {
+        if (news[i] != L_ESC)
+          luaL_error(ms->L, "invalid use of " LUA_QL("%c")
+                           " in replacement string", L_ESC);
         luaL_addchar(b, news[i]);
+      }
       else if (news[i] == '0')
           luaL_addlstring(b, s, e - s);
       else {