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string.byte returns nil if index is out-of-range

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Roberto Ierusalimschy 2003-02-12 07:10:41 -02:00
parent 2fef8c772b
commit 8f105d6b59
1 changed files with 3 additions and 2 deletions
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5
lstrlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lstrlib.c,v 1.92 2002/12/04 17:38:31 roberto Exp roberto $
** $Id: lstrlib.c,v 1.93 2002/12/20 10:26:33 roberto Exp roberto $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
@ -98,7 +98,8 @@ static int str_byte (lua_State *L) {
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
sint32 pos = posrelat(luaL_optlong(L, 2, 1), l);
luaL_argcheck(L, 0 < pos && (size_t)(pos) <= l, 2, "out of range");
if (pos <= 0 || (size_t)(pos) > l) /* index out of range? */
return 0; /* no answer */
lua_pushnumber(L, uchar(s[pos-1]));
return 1;
}