/*
** $Id: luaconf_internal.h,v ... $
** Configuration file for Lua (internal)
** See Copyright Notice in lua.h
*/


#ifndef lconfig_internal_h
#define lconfig_internal_h

#ifdef lua_assert
# include <assert.h>
#endif

/*
** ==================================================================
** 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(__STRICT_ANSI__)
#define LUA_ANSI
#endif


#if !defined(LUA_ANSI) && defined(_WIN32)
#define LUA_WIN
#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 functionallity 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_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_PATHSEP is the character that separates templates in a path.
@@ LUA_PATH_MARK is the string that marks the substitution points in a
@* template.
@@ LUA_EXECDIR in a Windows path is replaced by the executable's
@* directory.
@@ LUA_IGMARK is a mark to ignore all before it when bulding the
@* luaopen_ function name.
** CHANGE them if for some reason your system cannot use those
** characters. (E.g., if one of those characters is a common character
** in file/directory names.) Probably you do not need to change them.
*/
#define LUA_PATHSEP	";"
#define LUA_PATH_MARK	"?"
#define LUA_EXECDIR	"!"
#define LUA_IGMARK	"-"


/*
** Default number mode
*/
#if (!defined LNUM_DOUBLE) && (!defined LNUM_FLOAT) && (!defined LNUM_LDOUBLE)
# define LNUM_DOUBLE
#endif

/*
** Require C99 mode for COMPLEX, FLOAT and LDOUBLE (only DOUBLE is ANSI C).
*/
#if defined(LNUM_COMPLEX) && (__STDC_VERSION__ < 199901L)
# error "Need C99 for complex (use '--std=c99' or similar)"
#elif defined(LNUM_LDOUBLE) && (__STDC_VERSION__ < 199901L) && !defined(_MSC_VER)
# error "Need C99 for 'long double' (use '--std=c99' or similar)"
#elif defined(LNUM_FLOAT) && (__STDC_VERSION__ < 199901L)
/* LNUM_FLOAT not supported on Windows */
# error "Need C99 for 'float' (use '--std=c99' or similar)"
#endif

/*
** COMPLEX mode currently only with integer optimization
*/
#if defined(LNUM_COMPLEX) && !(defined(LNUM_INT32) || defined(LNUM_INT64))
# error "LNUM_COMPLEX needs to be used together with LNUM_INTxx"
#endif
 
/*
** Number mode identifier to accompany the version string.
*/
#ifdef LNUM_COMPLEX
# define _LNUM1 "complex "
#else
# define _LNUM1 ""
#endif
#ifdef LNUM_DOUBLE
# define _LNUM2 "double"
#elif defined(LNUM_FLOAT)
# define _LNUM2 "float"
#elif defined(LNUM_LDOUBLE)
# define _LNUM2 "ldouble"
#endif
#ifdef LNUM_INT32
# define _LNUM3 " int32"
#elif defined(LNUM_INT64)
# define _LNUM3 " int64"
#else
# define _LNUM3 ""
#endif
#ifdef __FAST_MATH__
# define _LNUM4 "fastmath"
#else
# define _LNUM4 ""
#endif
#define LUA_LNUM _LNUM1 _LNUM2 _LNUM3 _LNUM4


/* 
** LUAI_MAXNUMBER2STR: size of a buffer fitting any number->string result.
**
**  double:  24 (sign, x.xxxxxxxxxxxxxxe+nnnn, and \0)
**  int64:   21 (19 digits, sign, and \0)
**  long double: 43 for 128-bit (sign, x.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxe+nnnn, and \0)
**           30 for 80-bit (sign, x.xxxxxxxxxxxxxxxxxxxxe+nnnn, and \0)
*/
#ifdef LNUM_LDOUBLE
# define _LUAI_MN2S 44
#else
# define _LUAI_MN2S 24
#endif

#ifdef LNUM_COMPLEX
# define LUAI_MAXNUMBER2STR (2*_LUAI_MN2S)
#else
# define LUAI_MAXNUMBER2STR _LUAI_MN2S
#endif

/*
@@ lua_number2int is a macro to convert lua_Number to int.
@@ lua_number2integer is a macro to convert lua_Number to lua_Integer.
** 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.
**
** Note: Using '-msse' or '-msse3' is highly recommended for newer x86
**      processors. They have fast instructions to bypass the Pentium FP->int
**      efficiency problem altogether.  --AKa 6-Apr-2009
*/

/* On old Pentium (SSE not enabled), resort to a trick */
#if defined(LNUM_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
# 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; }
# endif

# ifndef LNUM_INT64
#  define lua_number2integer    lua_number2int
# endif

/* this option always works (and is fast on most platforms) */
#else
# define lua_number2int(i,d)        ((i)=(int)(d))
#endif

/* Note: Some compilers (OS X gcc 4.0?) may choke on double->long long conversion 
 *       since it can lose precision. Others do require 'long long' there.  
 */
#ifndef lua_number2integer
# define lua_number2integer(i,d)    ((i)=(lua_Integer)(d))
#endif

/*
** 'luai_abs()' to give absolute value of 'lua_Integer'
*/

#define luai_abs(v) ((v) >= 0 ? (v) : -(v))

/*
#ifdef LNUM_INT64
# if (__STDC_VERSION__ >= 199901L)
#  define luai_abs llabs
# else
#  define luai_abs(v) ((v) >= 0 ? (v) : -(v))
# endif
#else
# define luai_abs abs
#endif
*/

/*
** LUAI_UACNUMBER is the result of an 'usual argument conversion' over a number.
** LUAI_UACINTEGER the same, over an integer.
*/
#define LUAI_UACNUMBER	double
#define LUAI_UACINTEGER long

/* ANSI C only has math funcs for 'double. C99 required for float and long double
 * variants.
 */
#ifdef LNUM_DOUBLE
# define _LF(name) name
#elif defined(LNUM_FLOAT)
# define _LF(name) name ## f
#elif defined(LNUM_LDOUBLE)
# define _LF(name) name ## l
#endif


/*
@@ LUAI_FUNC is a mark for all extern functions that are not to be
@* exported to outside modules.
@@ LUAI_DATA is a mark for all extern (const) variables that are not to
@* be exported to outside modules.
** 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.
*/
#if defined(luaall_c)
#define LUAI_FUNC	static
#define LUAI_DATA	/* empty */

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

#else
#define LUAI_FUNC	extern
#define LUAI_DATA	extern
#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")


/*
** {==================================================================
** Stand-alone configuration
** ===================================================================
*/

#if defined(lua_c) || defined(luaall_c)

/*
@@ lua_stdin_is_tty detects whether the standard input is a 'tty' (that
@* is, whether we're running lua interactively).
** CHANGE it if you have a better definition for non-POSIX/non-Windows
** systems.
*/
#if defined(LUA_USE_ISATTY)
#include <unistd.h>
#define lua_stdin_is_tty()	isatty(0)
#elif defined(LUA_WIN)
#include <io.h>
#include <stdio.h>
#define lua_stdin_is_tty()	_isatty(_fileno(stdin))
#else
#define lua_stdin_is_tty()	1  /* assume stdin is a tty */
#endif


/*
@@ LUA_PROMPT is the default prompt used by stand-alone Lua.
@@ LUA_PROMPT2 is the default continuation prompt used by stand-alone Lua.
** CHANGE them if you want different prompts. (You can also change the
** prompts dynamically, assigning to globals _PROMPT/_PROMPT2.)
*/
#define LUA_PROMPT		"> "
#define LUA_PROMPT2		">> "


/*
@@ LUA_PROGNAME is the default name for the stand-alone Lua program.
** CHANGE it if your stand-alone interpreter has a different name and
** your system is not able to detect that name automatically.
*/
#define LUA_PROGNAME		"lua"


/*
@@ LUA_MAXINPUT is the maximum length for an input line in the
@* stand-alone interpreter.
** CHANGE it if you need longer lines.
*/
#define LUA_MAXINPUT	512


/*
@@ lua_readline defines how to show a prompt and then read a line from
@* the standard input.
@@ lua_saveline defines how to "save" a read line in a "history".
@@ lua_freeline defines how to free a line read by lua_readline.
** CHANGE them if you want to improve this functionality (e.g., by using
** GNU readline and history facilities).
*/
#if defined(LUA_USE_READLINE)
#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>
#define lua_readline(L,b,p)	((void)L, ((b)=readline(p)) != NULL)
#define lua_saveline(L,idx) \
	if (lua_strlen(L,idx) > 0)  /* non-empty line? */ \
	  add_history(lua_tostring(L, idx));  /* add it to history */
#define lua_freeline(L,b)	((void)L, free(b))
#else
#define lua_readline(L,b,p)	\
	((void)L, fputs(p, stdout), fflush(stdout),  /* show prompt */ \
	fgets(b, LUA_MAXINPUT, stdin) != NULL)  /* get line */
#define lua_saveline(L,idx)	{ (void)L; (void)idx; }
#define lua_freeline(L,b)	{ (void)L; (void)b; }
#endif

#endif

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


/*
@@ LUAI_GCPAUSE defines the default pause between garbage-collector cycles
@* as a percentage.
** CHANGE it if you want the GC to run faster or slower (higher values
** mean larger pauses which mean slower collection.) You can also change
** this value dynamically.
*/
#define LUAI_GCPAUSE	200  /* 200% (wait memory to double before next GC) */


/*
@@ LUAI_GCMUL defines the default speed of garbage collection relative to
@* memory allocation as a percentage.
** CHANGE it if you want to change the granularity of the garbage
** collection. (Higher values mean coarser collections. 0 represents
** infinity, where each step performs a full collection.) You can also
** change this value dynamically.
*/
#define LUAI_GCMUL	200 /* GC runs 'twice the speed' of memory allocation */


/*
@@ luai_apicheck is the assert macro used by the Lua-C API.
** CHANGE luai_apicheck if you want Lua to perform some checks in the
** parameters it gets from API calls. This may slow down the interpreter
** a bit, but may be quite useful when debugging C code that interfaces
** with Lua. A useful redefinition is to use assert.h.
*/
#if defined(LUA_USE_APICHECK)
#include <assert.h>
#define luai_apicheck(L,o)	{ (void)L; assert(o); }
#else
#define luai_apicheck(L,o)	{ (void)L; }
#endif


/*
@@ LUAI_UINT32 is an unsigned integer with at least 32 bits.
@@ LUAI_INT32 is an signed integer with at least 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. (The definitions in the 'else'
** part always works, but may waste space on machines with 64-bit
** longs.) Probably you do not need to change this.
*/
#if LUAI_BITSINT >= 32
#define LUAI_UINT32	unsigned int
#define LUAI_INT32	int
#define LUAI_MAXINT32	INT_MAX
#define LUAI_UMEM	size_t
#define LUAI_MEM	ptrdiff_t
#else
/* 16-bit ints */
#define LUAI_UINT32	unsigned long
#define LUAI_INT32	long
#define LUAI_MAXINT32	LONG_MAX
#define LUAI_UMEM	unsigned long
#define LUAI_MEM	long
#endif

/*
@@ LUAI_MAXCALLS limits the number of nested calls.
** CHANGE it if you need really deep recursive calls. This limit is
** arbitrary; its only purpose is to stop infinite recursion before
** exhausting memory.
*/
#define LUAI_MAXCALLS	20000


/*
@@ LUAI_MAXCSTACK limits the number of Lua stack slots that a C function
@* can use.
** CHANGE it if you need lots of (Lua) stack space for your C
** functions. This limit is arbitrary; its only purpose is to stop C
** functions to consume unlimited stack space. (must be smaller than
** -LUA_REGISTRYINDEX)
*/
#define LUAI_MAXCSTACK	8000



/*
** {==================================================================
** 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.
** ===================================================================
*/


/*
@@ LUAI_MAXCCALLS is the maximum depth for nested C calls (short) and
@* syntactical nested non-terminals in a program.
*/
#define LUAI_MAXCCALLS		200


/*
@@ LUAI_MAXVARS is the maximum number of local variables per function
@* (must be smaller than 250).
*/
#define LUAI_MAXVARS		200


/*
@@ LUAI_MAXUPVALUES is the maximum number of upvalues per function
@* (must be smaller than 250).
*/
#define LUAI_MAXUPVALUES	60


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


/*
@@ LUAI_USER_ALIGNMENT_T is a type that requires maximum alignment.
*/
#define LUAI_USER_ALIGNMENT_T	union { LUA_NUMBER u; void *s; long l; }


/*
@@ LUAI_THROW/LUAI_TRY define how Lua does exception handling.
** CHANGE them if you prefer to use longjmp/setjmp even with C++
** or if want/don't to use _longjmp/_setjmp instead of regular
** longjmp/setjmp. By default, Lua handles errors with exceptions when
** compiling as C++ code, with _longjmp/_setjmp when asked to use them,
** and with longjmp/setjmp otherwise.
*/
#if defined(__cplusplus)
/* C++ exceptions */
#define LUAI_THROW(L,c)	throw(c)
#define LUAI_TRY(L,c,a)	try { a } catch(...) \
	{ if ((c)->status == 0) (c)->status = -1; }
#define luai_jmpbuf	int  /* dummy variable */

#elif defined(LUA_USE_ULONGJMP)
/* in Unix, try _longjmp/_setjmp (more efficient) */
#define LUAI_THROW(L,c)	_longjmp((c)->b, 1)
#define LUAI_TRY(L,c,a)	if (_setjmp((c)->b) == 0) { a }
#define luai_jmpbuf	jmp_buf

#else
/* default handling with long jumps */
#define LUAI_THROW(L,c)	longjmp((c)->b, 1)
#define LUAI_TRY(L,c,a)	if (setjmp((c)->b) == 0) { a }
#define luai_jmpbuf	jmp_buf

#endif


/*
@@ LUA_MAXCAPTURES is the maximum number of captures that a pattern
@* can do during pattern-matching.
** CHANGE it if you need more captures. This limit is arbitrary.
*/
#define LUA_MAXCAPTURES		32


/*
@@ lua_tmpnam is the function that the OS library uses to create a
@* temporary name.
@@ LUA_TMPNAMBUFSIZE is the maximum size of a name created by lua_tmpnam.
** CHANGE them if you have an alternative to tmpnam (which is considered
** insecure) or if you want the original tmpnam anyway.  By default, Lua
** uses tmpnam except when POSIX is available, where it uses mkstemp.
*/
#if defined(loslib_c) || defined(luaall_c)

#if defined(LUA_USE_MKSTEMP)
#include <unistd.h>
#define LUA_TMPNAMBUFSIZE	32
#define lua_tmpnam(b,e)	{ \
	strcpy(b, "/tmp/lua_XXXXXX"); \
	e = mkstemp(b); \
	if (e != -1) close(e); \
	e = (e == -1); }

#else
#define LUA_TMPNAMBUFSIZE	L_tmpnam
#define lua_tmpnam(b,e)		{ e = (tmpnam(b) == NULL); }
#endif

#endif


/*
@@ lua_popen spawns a new process connected to the current one through
@* the file streams.
** CHANGE it if you have a way to implement it in your system.
*/
#if defined(LUA_USE_POPEN)

#define lua_popen(L,c,m)	((void)L, fflush(NULL), popen(c,m))
#define lua_pclose(L,file)	((void)L, (pclose(file) != -1))

#elif defined(LUA_WIN)

#define lua_popen(L,c,m)	((void)L, _popen(c,m))
#define lua_pclose(L,file)	((void)L, (_pclose(file) != -1))

#else

#define lua_popen(L,c,m)	((void)((void)c, m),  \
		luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)
#define lua_pclose(L,file)		((void)((void)L, file), 0)

#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


/*
@@ LUAI_EXTRASPACE allows you to add user-specific data in a lua_State
@* (the data goes just *before* the lua_State pointer).
** CHANGE (define) this if you really need that. This value must be
** a multiple of the maximum alignment required for your machine.
*/
#define LUAI_EXTRASPACE		0


/*
@@ luai_userstate* allow user-specific actions on threads.
** CHANGE them if you defined LUAI_EXTRASPACE and need to do something
** extra when a thread is created/deleted/resumed/yielded.
*/
#define luai_userstateopen(L)		((void)L)
#define luai_userstateclose(L)		((void)L)
#define luai_userstatethread(L,L1)	((void)L)
#define luai_userstatefree(L)		((void)L)
#define luai_userstateresume(L,n)	((void)L)
#define luai_userstateyield(L,n)	((void)L)


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

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



#endif

