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'select' accepts negative indices

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This commit is contained in:
Roberto Ierusalimschy 2005-09-16 15:22:48 -03:00
parent 8dcc6bc532
commit c8c2e06899
1 changed files with 4 additions and 3 deletions
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7
lbaselib.c
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@ -1,5 +1,5 @@
/* /*
** $Id: lbaselib.c,v 1.181 2005/08/15 14:12:32 roberto Exp roberto $ ** $Id: lbaselib.c,v 1.182 2005/08/26 17:36:32 roberto Exp roberto $
** Basic library ** Basic library
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -349,8 +349,9 @@ static int luaB_select (lua_State *L) {
} }
else { else {
int i = luaL_checkint(L, 1); int i = luaL_checkint(L, 1);
if (i <= 0) i = 1; if (i < 0) i = n + i;
else if (i >= n) i = n; else if (i > n) i = n;
luaL_argcheck(L, 1 <= i, 1, "index out of range");
return n - i; return n - i;
} }
} }