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'table.concat' may get confused with too large limits

This commit is contained in:
Roberto Ierusalimschy 2008-02-14 14:03:27 -02:00
parent 5ac3386888
commit 843d53aabb
1 changed files with 15 additions and 9 deletions
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24
ltablib.c
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@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.41 2007/09/12 20:53:24 roberto Exp roberto $
** $Id: ltablib.c,v 1.42 2007/11/26 16:57:33 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@ -123,6 +123,15 @@ static int tremove (lua_State *L) {
}
static void addfield (lua_State *L, luaL_Buffer *b, int i) {
lua_rawgeti(L, 1, i);
if (!lua_isstring(L, -1))
luaL_error(L, "invalid value (%s) at index %d in table for "
LUA_QL("concat"), luaL_typename(L, -1), i);
luaL_addvalue(b);
}
static int tconcat (lua_State *L) {
luaL_Buffer b;
size_t lsep;
@ -132,15 +141,12 @@ static int tconcat (lua_State *L) {
i = luaL_optint(L, 3, 1);
last = luaL_opt(L, luaL_checkint, 4, (int)lua_objlen(L, 1));
luaL_buffinit(L, &b);
for (; i <= last; i++) {
lua_rawgeti(L, 1, i);
if (!lua_isstring(L, -1))
return luaL_error(L, "invalid value (%s) at index %d in table for "
LUA_QL("concat"), luaL_typename(L, -1), i);
luaL_addvalue(&b);
if (i != last)
luaL_addlstring(&b, sep, lsep);
for (; i < last; i++) {
addfield(L, &b, i);
luaL_addlstring(&b, sep, lsep);
}
if (i == last) /* add last value (if interval was not empty) */
addfield(L, &b, i);
luaL_pushresult(&b);
return 1;
}