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

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This commit is contained in:
Roberto Ierusalimschy 2009-02-03 17:39:19 -02:00
parent 4c399c5dfb
commit cbf0c7a103
1 changed files with 6 additions and 2 deletions
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8
lstrlib.c
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@ -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 {