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cleaner test for overflow for range of 'math.random'

This commit is contained in:
Roberto Ierusalimschy 2014-11-07 09:31:58 -02:00
parent 50b18f60cb
commit 17ca3b1763
1 changed files with 3 additions and 3 deletions
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6
lmathlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lmathlib.c,v 1.111 2014/10/24 11:42:06 roberto Exp roberto $
** $Id: lmathlib.c,v 1.112 2014/11/02 19:19:04 roberto Exp roberto $
** Standard mathematical library
** See Copyright Notice in lua.h
*/
@ -258,8 +258,8 @@ static int math_random (lua_State *L) {
}
/* random integer in the interval [low, up] */
luaL_argcheck(L, low <= up, 1, "interval is empty");
luaL_argcheck(L, (lua_Unsigned)up - low <= (lua_Unsigned)LUA_MAXINTEGER,
1, "interval too large");
luaL_argcheck(L, low >= 0 || up <= LUA_MAXINTEGER + low, 1,
"interval too large");
r *= (double)(up - low) + 1.0;
lua_pushinteger(L, (lua_Integer)r + low);
return 1;