From 2a03170ebd096288c833e034000dc177784f2040 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 18 Aug 1999 11:40:51 -0300
Subject: [PATCH] random(0) and random(x,0) are wrong (0 is read as no
 argument!).

---
 bugs       |  8 ++++++++
 lmathlib.c | 19 +++++++++++--------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/bugs b/bugs
index cf25945d..7fea0b7e 100644
--- a/bugs
+++ b/bugs
@@ -102,3 +102,11 @@ Wed Jun 16 10:32:46 EST 1999
 the number of returns of a function.
 (since 3.1)
 
+
+
+--- Version 3.2
+
+** lmathlib.c
+Wed Aug 18 11:28:38 EST 1999
+>> random(0) and random(x,0) are wrong (0 is read as no argument!).
+(by Dave Bollinger; since 3.1)
diff --git a/lmathlib.c b/lmathlib.c
index 0ea8491e..b6eb16fb 100644
--- a/lmathlib.c
+++ b/lmathlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lmathlib.c,v 1.17 1999/07/07 17:54:08 roberto Exp roberto $
+** $Id: lmathlib.c,v 1.18 1999/08/16 20:52:00 roberto Exp roberto $
 ** Lua standard mathematical library
 ** See Copyright Notice in lua.h
 */
@@ -144,17 +144,20 @@ static void math_random (void) {
   /* the '%' avoids the (rare) case of r==1, and is needed also because on
      some systems (SunOS!) "rand()" may return a value bigger than RAND_MAX */
   double r = (double)(rand()%RAND_MAX) / (double)RAND_MAX;
-  int l = luaL_opt_int(1, 0);
-  if (l == 0)
-    lua_pushnumber(r);
+  if (lua_getparam(1) == LUA_NOOBJECT)  /* no arguments? */
+    lua_pushnumber(r);  /* real between 0 & 1 */
   else {
-    int u = luaL_opt_int(2, 0);
-    if (u == 0) {
-      u = l;
+    int l, u;  /* lower & upper limits */
+    if (lua_getparam(2) == LUA_NOOBJECT) {  /* only one argument? */
       l = 1;
+      u = luaL_check_int(1);
+    }
+    else {  /* two arguments */
+      l = luaL_check_int(1);
+      u = luaL_check_int(2);
     }
     luaL_arg_check(l<=u, 1, "interval is empty");
-    lua_pushnumber((int)(r*(u-l+1))+l);
+    lua_pushnumber((int)(r*(u-l+1))+l);  /* integer between l & u */
   }
 }