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'string.pack("cn")' does not accept strings longer than 'n'

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Roberto Ierusalimschy
2016-05-18 15:19:51 -03:00
parent b65252b39b
commit 4d5ab9baa6
1 changed files with 6 additions and 8 deletions
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14
lstrlib.c
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@@ -1,5 +1,5 @@
/* /*
** $Id: lstrlib.c,v 1.248 2016/05/02 13:58:01 roberto Exp roberto $ ** $Id: lstrlib.c,v 1.249 2016/05/13 19:09:46 roberto Exp roberto $
** Standard library for string operations and pattern-matching ** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@@ -1369,13 +1369,11 @@ static int str_pack (lua_State *L) {
case Kchar: { /* fixed-size string */ case Kchar: { /* fixed-size string */
size_t len; size_t len;
const char *s = luaL_checklstring(L, arg, &len); const char *s = luaL_checklstring(L, arg, &len);
if ((size_t)size <= len) /* string larger than (or equal to) needed? */ luaL_argcheck(L, len <= (size_t)size, arg,
luaL_addlstring(&b, s, size); /* truncate string to asked size */ "string longer than given size");
else { /* string smaller than needed */ luaL_addlstring(&b, s, len); /* add string */
luaL_addlstring(&b, s, len); /* add it all */ while (len++ < (size_t)size) /* pad extra space */
while (len++ < (size_t)size) /* pad extra space */ luaL_addchar(&b, LUAL_PACKPADBYTE);
luaL_addchar(&b, LUAL_PACKPADBYTE);
}
break; break;
} }
case Kstring: { /* strings with length count */ case Kstring: { /* strings with length count */