ok to use `#elif' and `#if defined()'

liolib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 2.41 2003/04/30 20:24:38 roberto Exp roberto $
+** $Id: liolib.c,v 2.42 2003/05/14 19:03:43 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -37,16 +37,12 @@
 ** by default, posix systems get `popen'
 */
 #ifndef USE_POPEN
-#ifdef _POSIX_C_SOURCE
-#if _POSIX_C_SOURCE >= 2
+#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 2
 #define USE_POPEN	1
-#endif
-#endif
-#endif
-
-#ifndef USE_POPEN
+#else
 #define USE_POPEN	0
 #endif
+#endif
 
 
 

llimits.h

@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.53 2003/04/28 19:26:16 roberto Exp roberto $
+** $Id: llimits.h,v 1.54 2003/04/28 19:57:50 roberto Exp roberto $
 ** Limits, basic types, and some other `installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
@@ -22,15 +22,13 @@
 /* avoid overflows in comparison */
 #if INT_MAX-20 < 32760
 #define	BITS_INT	16
-#else
-#if INT_MAX > 2147483640L
+#elif INT_MAX > 2147483640L
 /* machine has at least 32 bits */
 #define BITS_INT	32
 #else
 #error "you must define BITS_INT with number of bits in an integer"
 #endif
 #endif
-#endif
 
 
 /*

loadlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: loadlib.c,v 1.3 2003/04/02 13:09:14 roberto Exp roberto $
+** $Id: loadlib.c,v 1.4 2003/04/07 20:11:53 roberto Exp roberto $
 ** Dynamic library loader for Lua
 ** See Copyright Notice in lua.h
 *
@@ -136,33 +136,13 @@ static int loadlib(lua_State *L)
 ** Those systems support dlopen, so they should have defined USE_DLOPEN.
 ** The default (no)implementation gives them a special error message.
 */
-#ifdef linux
-#define LOADLIB
-#endif
-
-#ifdef sun
-#define LOADLIB
-#endif
-
-#ifdef sgi
-#define LOADLIB
-#endif
-
-#ifdef BSD
-#define LOADLIB
-#endif
-
-#ifdef _WIN32
-#define LOADLIB
-#endif
-
-#ifdef LOADLIB
-#undef LOADLIB
+#if defined(linux) || defined(sun) || defined(sgi) || defined(BSD) || defined(_WIN32)
 #define LOADLIB	"`loadlib' not installed (check your Lua configuration)"
 #else
 #define LOADLIB	"`loadlib' not supported"
 #endif
 
+
 static int loadlib(lua_State *L)
 {
  lua_pushnil(L);