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author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2014-11-07 09:31:58 -0200 |
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committer | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2014-11-07 09:31:58 -0200 |
commit | 17ca3b176321fb3a33f4542982e6ff3e82a3d864 (patch) | |
tree | b63d73cb64ab46ed4a7e6542382116141c7eed54 /lmathlib.c | |
parent | 50b18f60cb31b361dff6af6cde8389352641d7c1 (diff) | |
download | lua-github-17ca3b176321fb3a33f4542982e6ff3e82a3d864.tar.gz |
cleaner test for overflow for range of 'math.random'
Diffstat (limited to 'lmathlib.c')
-rw-r--r-- | lmathlib.c | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -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; |