Minor tweaks to luac.cross for SDK 1.4 support

plus Add extra logic to handle different loci path in luac.cross
for handling 32 bit or great hex integers Also add a helpfull hint in the
build tool to point out the Lua and lfs depencencies.

app/libc/c_stdlib.c

@@ -1,9 +1,20 @@
+//#include "user_interface.h"
+#include "user_config.h"
+
+#ifdef LUA_CROSS_COMPILER
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#define ICACHE_RODATA_ATTR
+#define TRUE  1
+#define FALSE 0
+
+#else
+
 #include "c_stdlib.h"
-#include "c_stdio.h"
 #include "c_types.h"
 #include "c_string.h"
-#include "user_interface.h"
-#include "user_config.h"
 
 // const char *lua_init_value = "print(\"Hello world\")";
 const char *lua_init_value = "@init.lua";
@@ -21,7 +32,6 @@ const char *c_getenv(const char *__string)
     }
     return NULL;
 }
-
 // make sure there is enough memory before real malloc, otherwise malloc will panic and reset
 // void *c_malloc(size_t __size){
 //  if(__size>system_get_free_heap_size()){
@@ -43,7 +53,8 @@ const char *c_getenv(const char *__string)
 //  // NODE_ERR("free1: %d\n", system_get_free_heap_size());
 //  os_free(p);
 //  // NODE_ERR("-free1: %d\n", system_get_free_heap_size());
-// }
+// }c_stdlib.s
+
 
 
 // int  c_rand(void){
@@ -55,9 +66,8 @@ const char *c_getenv(const char *__string)
 // }
 #include <_ansi.h>
 //#include <reent.h>
-#include <string.h>
 //#include "mprec.h"
-
+#endif
 double powersOf10[] ICACHE_STORE_ATTR ICACHE_RODATA_ATTR =   /* Table giving binary powers of 10.  Entry */
 {
     10.,            /* is 10^2^i.  Used to convert decimal */

app/lua/lobject.c

@@ -22,6 +22,8 @@
 #include "lvm.h"
 #ifndef LUA_CROSS_COMPILER
 #include "flash_api.h"
+#else
+#include <limits.h>
 #endif
 const TValue luaO_nilobject_ = {LUA_TVALUE_NIL};
 
@@ -96,7 +98,21 @@ int luaO_str2d (const char *s, lua_Number *result) {
   *result = lua_str2number(s, &endptr);
   if (endptr == s) return 0;  /* conversion failed */
   if (*endptr == 'x' || *endptr == 'X')  /* maybe an hexadecimal constant? */
+#if defined(LUA_CROSS_COMPILER) 
+    {
+    long lres = strtoul(s, &endptr, 16);
+#if LONG_MAX != 2147483647L
+    if (lres & ~0xffffffffL) 
+      *result = cast_num(-1);
+    else if (lres & 0x80000000L)
+      *result = cast_num(lres | ~0x7fffffffL);
+    else
+#endif
+      *result = cast_num(lres);
+    }
+#else
     *result = cast_num(c_strtoul(s, &endptr, 16));
+#endif
   if (*endptr == '\0') return 1;  /* most common case */
   while (isspace(cast(unsigned char, *endptr))) endptr++;
   if (*endptr != '\0') return 0;  /* invalid trailing characters? */

app/lua/lua.h

@@ -390,7 +390,9 @@ typedef struct __lua_load{
 
 int lua_main( int argc, char **argv );
 
+#ifndef LUA_CROSS_COMPILER
 void lua_handle_input (bool force);
+#endif
 
 /******************************************************************************
 * Copyright (C) 1994-2008 Lua.org, PUC-Rio.  All rights reserved.

app/lua/luac_cross.h

@@ -55,7 +55,7 @@
 #define c_strpbrk strpbrk
 #define c_strrchr strrchr
 #define c_strstr strstr
-#define c_strtod strtod
+double	c_strtod(const char *__n, char **__end_PTR);
 #define c_strtoul strtoul
 #define c_ungetc ungetc
 

tools/cross-lua.lua

@@ -3,11 +3,20 @@ local b = require "tools.build"
 local builder = b.new_builder( ".build/cross-lua" )
 local utils = b.utils
 local sf = string.format
+ 
+if not (_VERSION == "Lua 5.1" and pcall(require,"lfs")) then
+  print  [[
+
+cross_lua.lua must be run within Lua 5.1 and it requires the Lua Filesystem to be installed. 
+On most *nix distrubitions youwill find a packages lua-5.1 and lua-filesystem, or 
+alternalively you can install lua-rocks and use the Rocks package manager to install lfs.
+]]
+  os.exit(1)
+end
 builder:init( args )
 builder:set_build_mode( builder.BUILD_DIR_LINEARIZED )
- 
 local output = 'luac.cross'
-local cdefs = '-DLUA_CROSS_COMPILER -O2'
+local cdefs = '-DLUA_CROSS_COMPILER'
 
 -- Lua source files and include path
 local lua_files = [[
@@ -17,6 +26,7 @@ local lua_files = [[
     ltm.c  lundump.c lvm.c lzio.c 
     luac_cross/luac.c luac_cross/loslib.c luac_cross/print.c
     ../modules/linit.c
+    ../libc/c_stdlib.c
   ]]
 lua_files = lua_files:gsub( "\n" , "" )
 local lua_full_files = utils.prepend_path( lua_files, "app/lua" )