lua/luaconf.h

/*
** $Id: luaconf.h,v 1.123 2009/12/17 12:50:20 roberto Exp roberto $
** Configuration file for Lua
** See Copyright Notice in lua.h
*/


#ifndef lconfig_h
#define lconfig_h

#include <limits.h>
#include <stddef.h>


/*
** ==================================================================
** Search for "@@" to find all configurable definitions.
** ===================================================================
*/


/*
@@ LUA_ANSI controls the use of non-ansi features.
** CHANGE it (define it) if you want Lua to avoid the use of any
** non-ansi feature or library.
*/
#if !defined(LUA_ANSI) && defined(__STRICT_ANSI__)
#define LUA_ANSI
#endif


#if !defined(LUA_ANSI) && defined(_WIN32)
#define LUA_WIN
#endif

#if defined(LUA_WIN)
#include <windows.h>
#endif



#if defined(LUA_USE_LINUX)
#define LUA_USE_POSIX
#define LUA_USE_DLOPEN		/* needs an extra library: -ldl */
#define LUA_USE_READLINE	/* needs some extra libraries */
#endif

#if defined(LUA_USE_MACOSX)
#define LUA_USE_POSIX
#define LUA_DL_DYLD		/* does not need extra library */
#endif



/*
@@ LUA_USE_POSIX includes all functionality listed as X/Open System
@* Interfaces Extension (XSI).
** CHANGE it (define it) if your system is XSI compatible.
*/
#if defined(LUA_USE_POSIX)
#define LUA_USE_MKSTEMP
#define LUA_USE_ISATTY
#define LUA_USE_POPEN
#define LUA_USE_ULONGJMP
#endif



/*
@@ LUA_PATH_DEFAULT is the default path that Lua uses to look for
@* Lua libraries.
@@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for
@* C libraries.
** CHANGE them if your machine has a non-conventional directory
** hierarchy or if you want to install your libraries in
** non-conventional directories.
*/
#if defined(_WIN32)
/*
** In Windows, any exclamation mark ('!') in the path is replaced by the
** path of the directory of the executable file of the current process.
*/
#define LUA_LDIR	"!\\lua\\"
#define LUA_CDIR	"!\\"
#define LUA_PATH_DEFAULT  \
		LUA_LDIR"?.lua;"  LUA_LDIR"?\\init.lua;" \
		LUA_CDIR"?.lua;"  LUA_CDIR"?\\init.lua;" ".\\?.lua"
#define LUA_CPATH_DEFAULT \
		LUA_CDIR"?.dll;" LUA_CDIR"loadall.dll;" ".\\?.dll"

#else
#define LUA_ROOT	"/usr/local/"
#define LUA_LDIR	LUA_ROOT "share/lua/5.1/"
#define LUA_CDIR	LUA_ROOT "lib/lua/5.1/"
#define LUA_PATH_DEFAULT  \
		LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \
		LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua;" "./?.lua"
#define LUA_CPATH_DEFAULT \
		LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"
#endif


/*
@@ LUA_DIRSEP is the directory separator (for submodules).
** CHANGE it if your machine does not use "/" as the directory separator
** and is not Windows. (On Windows Lua automatically uses "\".)
*/
#if defined(_WIN32)
#define LUA_DIRSEP	"\\"
#else
#define LUA_DIRSEP	"/"
#endif


/*
@@ LUA_API is a mark for all core API functions.
@@ LUALIB_API is a mark for all auxiliary library functions.
@@ LUAMOD_API is a mark for all standard library opening functions.
** CHANGE them if you need to define those functions in some special way.
** For instance, if you want to create one Windows DLL with the core and
** the libraries, you may want to use the following definition (define
** LUA_BUILD_AS_DLL to get it).
*/
#if defined(LUA_BUILD_AS_DLL)

#if defined(LUA_CORE) || defined(LUA_LIB)
#define LUA_API __declspec(dllexport)
#else
#define LUA_API __declspec(dllimport)
#endif

#else

#define LUA_API		extern

#endif

/* more often than not the libs go together with the core */
#define LUALIB_API	LUA_API
#define LUAMOD_API	LUALIB_API


/*
@@ LUAI_FUNC is a mark for all extern functions that are not to be
@* exported to outside modules.
@@ LUAI_DDEF and LUAI_DDEC are marks for all extern (const) variables
@* that are not to be exported to outside modules (LUAI_DDEF for
@* definitions and LUAI_DDEC for declarations).
** CHANGE them if you need to mark them in some special way. Elf/gcc
** (versions 3.2 and later) mark them as "hidden" to optimize access
** when Lua is compiled as a shared library. Not all elf targets support
** this attribute. Unfortunately, gcc does not offer a way to check
** whether the target offers that support, and those without support
** give a warning about it. To avoid these warnings, change to the
** default definition.
*/
#if defined(luaall_c)
#define LUAI_FUNC	static
#define LUAI_DDEC	static
#define LUAI_DDEF	static

#elif defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \
      defined(__ELF__)
#define LUAI_FUNC	__attribute__((visibility("hidden"))) extern
#define LUAI_DDEC	LUAI_FUNC
#define LUAI_DDEF	/* empty */

#else
#define LUAI_FUNC	extern
#define LUAI_DDEC	extern
#define LUAI_DDEF	/* empty */
#endif



/*
@@ LUA_QL describes how error messages quote program elements.
** CHANGE it if you want a different appearance.
*/
#define LUA_QL(x)	"'" x "'"
#define LUA_QS		LUA_QL("%s")


/*
@@ LUA_IDSIZE gives the maximum size for the description of the source
@* of a function in debug information.
** CHANGE it if you want a different size.
*/
#define LUA_IDSIZE	60


/*
@@ luai_writestring defines how 'print' prints its results.
** CHANGE it if your system does not have a useful stdout.
*/
#define luai_writestring(s,l)	fwrite((s), sizeof(char), (l), stdout)





/*
** {==================================================================
** Compatibility with previous versions
** ===================================================================
*/

/*
@@ LUA_COMPAT_FENV controls the presence of functions 'setfenv/getfenv'.
** CHANGE it (define it) if you need these functions.  (You can replace
** them with lexical environments, 'loadin', or the debug library.)
*/
/* #define LUA_COMPAT_FENV */

/*
@@ LUA_COMPAT_LOG10 defines the function 'log10' in the math library.
** CHANGE it (undefine it) if as soon as you rewrite all calls 'log10(x)'
** as 'log(x, 10)'
*/
#define LUA_COMPAT_LOG10

/*
@@ LUA_COMPAT_MAXN defines the function 'maxn' in the table library.
** CHANGE it (define it) if you need that function.
*/
/* #define LUA_COMPAT_MAXN */

/*
@@ LUA_COMPAT_API includes some macros and functions that supply some
@* compatibility with previous versions.
** CHANGE it (undefine it) if you do not need these compatibility facilities.
*/
#define LUA_COMPAT_API

/*
@@ LUA_COMPAT_DEBUGLIB controls compatibility with preloading
@* the debug library.
** CHANGE it to undefined as soon as you add 'require"debug"' everywhere
** you need the debug library.
*/
#define LUA_COMPAT_DEBUGLIB

/* }================================================================== */



/*
@@ LUAI_BITSINT defines the number of bits in an int.
** CHANGE here if Lua cannot automatically detect the number of bits of
** your machine. Probably you do not need to change this.
*/
/* avoid overflows in comparison */
#if INT_MAX-20 < 32760
#define LUAI_BITSINT	16
#elif INT_MAX > 2147483640L
/* int has at least 32 bits */
#define LUAI_BITSINT	32
#else
#error "you must define LUA_BITSINT with number of bits in an integer"
#endif


/*
@@ LUA_INT32 is an signed integer with exactly 32 bits.
@@ LUAI_UMEM is an unsigned integer big enough to count the total
@* memory used by Lua.
@@ LUAI_MEM is a signed integer big enough to count the total memory
@* used by Lua.
** CHANGE here if for some weird reason the default definitions are not
** good enough for your machine.  Probably you do not need to change
** this.
*/
#if LUAI_BITSINT >= 32
#define LUA_INT32	int
#define LUAI_UMEM	size_t
#define LUAI_MEM	ptrdiff_t
#else
/* 16-bit ints */
#define LUA_INT32	long
#define LUAI_UMEM	unsigned long
#define LUAI_MEM	long
#endif


/*
@@ LUAI_MAXSTACK limits the size of the Lua stack.
** CHANGE it if you need a different limit. This limit is arbitrary;
** its only purpose is to stop Lua to consume unlimited stack
** space (and to reserve some numbers for pseudo-indices).
*/
#if LUAI_BITSINT >= 32
#define LUAI_MAXSTACK		1000000
#else
#define LUAI_MAXSTACK		15000
#endif

/* reserve some space for error handling */
#define LUAI_FIRSTPSEUDOIDX  (-LUAI_MAXSTACK - 1000)



/*
** {==================================================================
** CHANGE (to smaller values) the following definitions if your system
** has a small C stack. (Or you may want to change them to larger
** values if your system has a large C stack and these limits are
** too rigid for you.) Some of these constants control the size of
** stack-allocated arrays used by the compiler or the interpreter, while
** others limit the maximum number of recursive calls that the compiler
** or the interpreter can perform. Values too large may cause a C stack
** overflow for some forms of deep constructs.
** ===================================================================
*/


/*
@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
*/
#define LUAL_BUFFERSIZE		BUFSIZ

/* }================================================================== */




/*
** {==================================================================
@@ LUA_NUMBER is the type of numbers in Lua.
** CHANGE the following definitions only if you want to build Lua
** with a number type different from double. You may also need to
** change lua_number2int & lua_number2integer.
** ===================================================================
*/

#define LUA_NUMBER_DOUBLE
#define LUA_NUMBER	double

/*
@@ LUAI_UACNUMBER is the result of an 'usual argument conversion'
@* over a number.
*/
#define LUAI_UACNUMBER	double


/*
@@ LUA_NUMBER_SCAN is the format for reading numbers.
@@ LUA_NUMBER_FMT is the format for writing numbers.
@@ lua_number2str converts a number to a string.
@@ LUAI_MAXNUMBER2STR is maximum size of previous conversion.
@@ lua_str2number converts a string to a number.
*/
#define LUA_NUMBER_SCAN		"%lf"
#define LUA_NUMBER_FMT		"%.14g"
#define lua_number2str(s,n)	sprintf((s), LUA_NUMBER_FMT, (n))
#define LUAI_MAXNUMBER2STR	32 /* 16 digits, sign, point, and \0 */
#define lua_str2number(s,p)	strtod((s), (p))


/*
@@ The luai_num* macros define the primitive operations over numbers.
*/

/* the following operations need the math library */
#if defined(lobject_c) || defined(lvm_c) || defined(luaall_c)
#include <math.h>
#define luai_nummod(L,a,b)	((a) - floor((a)/(b))*(b))
#define luai_numpow(L,a,b)	(pow(a,b))
#endif

/* these are quite standard operations */
#if defined(LUA_CORE)
#define luai_numadd(L,a,b)	((a)+(b))
#define luai_numsub(L,a,b)	((a)-(b))
#define luai_nummul(L,a,b)	((a)*(b))
#define luai_numdiv(L,a,b)	((a)/(b))
#define luai_numunm(L,a)	(-(a))
#define luai_numeq(a,b)		((a)==(b))
#define luai_numlt(L,a,b)	((a)<(b))
#define luai_numle(L,a,b)	((a)<=(b))
#define luai_numisnan(L,a)	(!luai_numeq((a), (a)))
#endif



/*
@@ LUA_INTEGER is the integral type used by lua_pushinteger/lua_tointeger.
** CHANGE that if ptrdiff_t is not adequate on your machine. (On most
** machines, ptrdiff_t gives a good choice between int or long.)
*/
#define LUA_INTEGER	ptrdiff_t


/*
@@ lua_number2int is a macro to convert lua_Number to int.
@@ lua_number2integer is a macro to convert lua_Number to lUA_INTEGER.
@@ lua_number2uint is a macro to convert a lua_Number to an unsigned
@* LUA_INT32.
@@ lua_uint2number is a macro to convert an unsigned LUA_INT32
@* to a lua_Number.
** CHANGE them if you know a faster way to convert a lua_Number to
** int (with any rounding method and without throwing errors) in your
** system. In Pentium machines, a naive typecast from double to int
** in C is extremely slow, so any alternative is worth trying.
*/

/* On a Pentium, resort to a trick */
#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && !defined(__SSE2__) && \
    (defined(__i386) || defined (_M_IX86) || defined(__i386__))

/* On a Microsoft compiler, use assembler */
#if defined(_MSC_VER)

#define lua_number2int(i,d)   __asm fld d   __asm fistp i
#define lua_number2integer(i,n)		lua_number2int(i, n)

#else
/* the next trick should work on any Pentium, but sometimes clashes
   with a DirectX idiosyncrasy */

union luai_Cast { double l_d; long l_l; };
#define lua_number2int(i,d) \
  { volatile union luai_Cast u; u.l_d = (d) + 6755399441055744.0; (i) = u.l_l; }
#define lua_number2integer(i,n)		lua_number2int(i, n)
#define lua_number2uint(i,n)		lua_number2int(i, n)

#endif


#else
/* this option always works, but may be slow */
#define lua_number2int(i,d)	((i)=(int)(d))
#define lua_number2integer(i,d)	((i)=(LUA_INTEGER)(d))
#define lua_number2uint(i,d)	((i)=(unsigned LUA_INT32)(d))

#endif


/* on several machines, coercion from unsigned to double is too slow,
   so avoid that if possible */
#define lua_uint2number(u)  \
	((LUA_INT32)(u) < 0 ? (lua_Number)(u) : (lua_Number)(LUA_INT32)(u))


/*
@@ luai_hashnum is a macro do hash a lua_Number value into an integer.
@* The hash must be deterministic and give reasonable values for
@* both small and large values (outside the range of integers). 
@* It is used only in ltable.c.
*/

#if defined(ltable_c) || defined(luaall_c)

#include <float.h>
#include <math.h>

#define luai_hashnum(i,d) { int e;  \
  d = frexp(d, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP);  \
  lua_number2int(i, d); i += e; }

#endif

/* }================================================================== */

/*
@@ LUA_DL_* define which dynamic-library system Lua should use.
** CHANGE here if Lua has problems choosing the appropriate
** dynamic-library system for your platform (either Windows' DLL, Mac's
** dyld, or Unix's dlopen). If your system is some kind of Unix, there
** is a good chance that it has dlopen, so LUA_DL_DLOPEN will work for
** it.  To use dlopen you also need to adapt the src/Makefile (probably
** adding -ldl to the linker options), so Lua does not select it
** automatically.  (When you change the makefile to add -ldl, you must
** also add -DLUA_USE_DLOPEN.)
** If you do not want any kind of dynamic library, undefine all these
** options.
** By default, _WIN32 gets LUA_DL_DLL and MAC OS X gets LUA_DL_DYLD.
*/
#if defined(LUA_USE_DLOPEN)
#define LUA_DL_DLOPEN
#endif

#if defined(LUA_WIN)
#define LUA_DL_DLL
#endif




/* =================================================================== */

/*
** Local configuration. You can use this space to add your redefinitions
** without modifying the main part of the file.
*/



#endif