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'string.find' cannot find things after subject's end

This commit is contained in:
Roberto Ierusalimschy 2008-04-14 12:54:59 -03:00
parent 6c84722afa
commit 24359ae294
1 changed files with 5 additions and 2 deletions
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7
lstrlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lstrlib.c,v 1.138 2007/10/29 15:51:10 roberto Exp roberto $
** $Id: lstrlib.c,v 1.139 2007/11/12 14:10:09 roberto Exp roberto $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
@ -499,7 +499,10 @@ static int str_find_aux (lua_State *L, int find) {
const char *p = luaL_checklstring(L, 2, &l2);
size_t init = posrelat(luaL_optinteger(L, 3, 1), l1);
if (init < 1) init = 1;
else if (init > l1) init = l1 + 1;
else if (init > l1 + 1) { /* start after string's end? */
lua_pushnil(L); /* cannot find anything */
return 1;
}
if (find && (lua_toboolean(L, 4) || /* explicit request? */
strpbrk(p, SPECIALS) == NULL)) { /* or no special characters? */
/* do a plain search */