1 /*

     2 ** $Id: luaconf.h,v 1.82.1.7 2008/02/11 16:25:08 roberto Exp $

     3 ** Configuration file for Lua

     4 ** See Copyright Notice in lua.h

     5 */

     6 

     7 

     8 #ifndef lconfig_h

     9 #define lconfig_h

    10 

    11 #include <limits.h>

    12 #include <stddef.h>

    13 

    14 

    15 /*

    16 ** ==================================================================

    17 ** Search for "@@" to find all configurable definitions.

    18 ** ===================================================================

    19 */

    20 

    21 

    22 /*

    23 @@ LUA_ANSI controls the use of non-ansi features.

    24 ** CHANGE it (define it) if you want Lua to avoid the use of any

    25 ** non-ansi feature or library.

    26 */

    27 #if defined(__STRICT_ANSI__)

    28 #define LUA_ANSI

    29 #endif

    30 

    31 

    32 #if !defined(LUA_ANSI) && defined(_WIN32)

    33 #define LUA_WIN

    34 #endif

    35 

    36 #if defined(LUA_USE_LINUX)

    37 #define LUA_USE_POSIX

    38 #define LUA_USE_DLOPEN		/* needs an extra library: -ldl */

    39 #define LUA_USE_READLINE	/* needs some extra libraries */

    40 #endif

    41 

    42 #if defined(LUA_USE_MACOSX)

    43 #define LUA_USE_POSIX

    44 #define LUA_DL_DYLD		/* does not need extra library */

    45 #endif

    46 

    47 

    48 

    49 /*

    50 @@ LUA_USE_POSIX includes all functionallity listed as X/Open System

    51 @* Interfaces Extension (XSI).

    52 ** CHANGE it (define it) if your system is XSI compatible.

    53 */

    54 #if defined(LUA_USE_POSIX)

    55 #define LUA_USE_MKSTEMP

    56 #define LUA_USE_ISATTY

    57 #define LUA_USE_POPEN

    58 #define LUA_USE_ULONGJMP

    59 #endif

    60 

    61 

    62 /*

    63 @@ LUA_PATH and LUA_CPATH are the names of the environment variables that

    64 @* Lua check to set its paths.

    65 @@ LUA_INIT is the name of the environment variable that Lua

    66 @* checks for initialization code.

    67 ** CHANGE them if you want different names.

    68 */

    69 #define LUA_PATH        "LUA_PATH"

    70 #define LUA_CPATH       "LUA_CPATH"

    71 #define LUA_INIT	"LUA_INIT"

    72 

    73 

    74 /*

    75 @@ LUA_PATH_DEFAULT is the default path that Lua uses to look for

    76 @* Lua libraries.

    77 @@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for

    78 @* C libraries.

    79 ** CHANGE them if your machine has a non-conventional directory

    80 ** hierarchy or if you want to install your libraries in

    81 ** non-conventional directories.

    82 */

    83 #if defined(_WIN32)

    84 /*

    85 ** In Windows, any exclamation mark ('!') in the path is replaced by the

    86 ** path of the directory of the executable file of the current process.

    87 */

    88 #define LUA_LDIR	"!\\lua\\"

    89 #define LUA_CDIR	"!\\"

    90 #define LUA_PATH_DEFAULT  \

    91 		".\\?.lua;"  LUA_LDIR"?.lua;"  LUA_LDIR"?\\init.lua;" \

    92 		             LUA_CDIR"?.lua;"  LUA_CDIR"?\\init.lua"

    93 #define LUA_CPATH_DEFAULT \

    94 	".\\?.dll;"  LUA_CDIR"?.dll;" LUA_CDIR"loadall.dll"

    95 

    96 #else

    97 #define LUA_ROOT	"/usr/local/"

    98 #define LUA_LDIR	LUA_ROOT "share/lua/5.1/"

    99 #define LUA_CDIR	LUA_ROOT "lib/lua/5.1/"

   100 #define LUA_PATH_DEFAULT  \

   101 		"./?.lua;"  LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \

   102 		            LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua"

   103 #define LUA_CPATH_DEFAULT \

   104 	"./?.so;"  LUA_CDIR"?.so;" LUA_CDIR"loadall.so"

   105 #endif

   106 

   107 

   108 /*

   109 @@ LUA_DIRSEP is the directory separator (for submodules).

   110 ** CHANGE it if your machine does not use "/" as the directory separator

   111 ** and is not Windows. (On Windows Lua automatically uses "\".)

   112 */

   113 #if defined(_WIN32)

   114 #define LUA_DIRSEP	"\\"

   115 #else

   116 #define LUA_DIRSEP	"/"

   117 #endif

   118 

   119 

   120 /*

   121 @@ LUA_PATHSEP is the character that separates templates in a path.

   122 @@ LUA_PATH_MARK is the string that marks the substitution points in a

   123 @* template.

   124 @@ LUA_EXECDIR in a Windows path is replaced by the executable's

   125 @* directory.

   126 @@ LUA_IGMARK is a mark to ignore all before it when bulding the

   127 @* luaopen_ function name.

   128 ** CHANGE them if for some reason your system cannot use those

   129 ** characters. (E.g., if one of those characters is a common character

   130 ** in file/directory names.) Probably you do not need to change them.

   131 */

   132 #define LUA_PATHSEP	";"

   133 #define LUA_PATH_MARK	"?"

   134 #define LUA_EXECDIR	"!"

   135 #define LUA_IGMARK	"-"

   136 

   137 

   138 /*

   139 @@ LUA_INTEGER is the integral type used by lua_pushinteger/lua_tointeger.

   140 ** CHANGE that if ptrdiff_t is not adequate on your machine. (On most

   141 ** machines, ptrdiff_t gives a good choice between int or long.)

   142 */

   143 #define LUA_INTEGER	ptrdiff_t

   144 

   145 

   146 /*

   147 @@ LUA_API is a mark for all core API functions.

   148 @@ LUALIB_API is a mark for all standard library functions.

   149 ** CHANGE them if you need to define those functions in some special way.

   150 ** For instance, if you want to create one Windows DLL with the core and

   151 ** the libraries, you may want to use the following definition (define

   152 ** LUA_BUILD_AS_DLL to get it).

   153 */

   154 #if defined(LUA_BUILD_AS_DLL)

   155 

   156 #if defined(LUA_CORE) || defined(LUA_LIB)

   157 #define LUA_API __declspec(dllexport)

   158 #else

   159 #define LUA_API __declspec(dllimport)

   160 #endif

   161 

   162 #else

   163 

   164 #define LUA_API		extern

   165 

   166 #endif

   167 

   168 /* more often than not the libs go together with the core */

   169 #define LUALIB_API	LUA_API

   170 

   171 

   172 /*

   173 @@ LUAI_FUNC is a mark for all extern functions that are not to be

   174 @* exported to outside modules.

   175 @@ LUAI_DATA is a mark for all extern (const) variables that are not to

   176 @* be exported to outside modules.

   177 ** CHANGE them if you need to mark them in some special way. Elf/gcc

   178 ** (versions 3.2 and later) mark them as "hidden" to optimize access

   179 ** when Lua is compiled as a shared library.

   180 */

   181 #if defined(luaall_c)

   182 #define LUAI_FUNC	static

   183 #define LUAI_DATA	/* empty */

   184 

   185 #elif defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \

   186       defined(__ELF__)

   187 #define LUAI_FUNC	__attribute__((visibility("hidden"))) extern

   188 #define LUAI_DATA	LUAI_FUNC

   189 

   190 #else

   191 #define LUAI_FUNC	extern

   192 #define LUAI_DATA	extern

   193 #endif

   194 

   195 

   196 

   197 /*

   198 @@ LUA_QL describes how error messages quote program elements.

   199 ** CHANGE it if you want a different appearance.

   200 */

   201 #define LUA_QL(x)	"'" x "'"

   202 #define LUA_QS		LUA_QL("%s")

   203 

   204 

   205 /*

   206 @@ LUA_IDSIZE gives the maximum size for the description of the source

   207 @* of a function in debug information.

   208 ** CHANGE it if you want a different size.

   209 */

   210 #define LUA_IDSIZE	60

   211 

   212 

   213 /*

   214 ** {==================================================================

   215 ** Stand-alone configuration

   216 ** ===================================================================

   217 */

   218 

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

   220 

   221 /*

   222 @@ lua_stdin_is_tty detects whether the standard input is a 'tty' (that

   223 @* is, whether we're running lua interactively).

   224 ** CHANGE it if you have a better definition for non-POSIX/non-Windows

   225 ** systems.

   226 */

   227 #if defined(LUA_USE_ISATTY)

   228 #include <unistd.h>

   229 #define lua_stdin_is_tty()	isatty(0)

   230 #elif defined(LUA_WIN)

   231 #include <io.h>

   232 #include <stdio.h>

   233 #define lua_stdin_is_tty()	_isatty(_fileno(stdin))

   234 #else

   235 #define lua_stdin_is_tty()	1  /* assume stdin is a tty */

   236 #endif

   237 

   238 

   239 /*

   240 @@ LUA_PROMPT is the default prompt used by stand-alone Lua.

   241 @@ LUA_PROMPT2 is the default continuation prompt used by stand-alone Lua.

   242 ** CHANGE them if you want different prompts. (You can also change the

   243 ** prompts dynamically, assigning to globals _PROMPT/_PROMPT2.)

   244 */

   245 #define LUA_PROMPT		"> "

   246 #define LUA_PROMPT2		">> "

   247 

   248 

   249 /*

   250 @@ LUA_PROGNAME is the default name for the stand-alone Lua program.

   251 ** CHANGE it if your stand-alone interpreter has a different name and

   252 ** your system is not able to detect that name automatically.

   253 */

   254 #define LUA_PROGNAME		"lua"

   255 

   256 

   257 /*

   258 @@ LUA_MAXINPUT is the maximum length for an input line in the

   259 @* stand-alone interpreter.

   260 ** CHANGE it if you need longer lines.

   261 */

   262 #define LUA_MAXINPUT	512

   263 

   264 

   265 /*

   266 @@ lua_readline defines how to show a prompt and then read a line from

   267 @* the standard input.

   268 @@ lua_saveline defines how to "save" a read line in a "history".

   269 @@ lua_freeline defines how to free a line read by lua_readline.

   270 ** CHANGE them if you want to improve this functionality (e.g., by using

   271 ** GNU readline and history facilities).

   272 */

   273 #if defined(LUA_USE_READLINE)

   274 #include <stdio.h>

   275 #include <readline/readline.h>

   276 #include <readline/history.h>

   277 #define lua_readline(L,b,p)	((void)L, ((b)=readline(p)) != NULL)

   278 #define lua_saveline(L,idx) \

   279 	if (lua_strlen(L,idx) > 0)  /* non-empty line? */ \

   280 	  add_history(lua_tostring(L, idx));  /* add it to history */

   281 #define lua_freeline(L,b)	((void)L, free(b))

   282 #else

   283 #define lua_readline(L,b,p)	\

   284 	((void)L, fputs(p, stdout), fflush(stdout),  /* show prompt */ \

   285 	fgets(b, LUA_MAXINPUT, stdin) != NULL)  /* get line */

   286 #define lua_saveline(L,idx)	{ (void)L; (void)idx; }

   287 #define lua_freeline(L,b)	{ (void)L; (void)b; }

   288 #endif

   289 

   290 #endif

   291 

   292 /* }================================================================== */

   293 

   294 

   295 /*

   296 @@ LUAI_GCPAUSE defines the default pause between garbage-collector cycles

   297 @* as a percentage.

   298 ** CHANGE it if you want the GC to run faster or slower (higher values

   299 ** mean larger pauses which mean slower collection.) You can also change

   300 ** this value dynamically.

   301 */

   302 #define LUAI_GCPAUSE	200  /* 200% (wait memory to double before next GC) */

   303 

   304 

   305 /*

   306 @@ LUAI_GCMUL defines the default speed of garbage collection relative to

   307 @* memory allocation as a percentage.

   308 ** CHANGE it if you want to change the granularity of the garbage

   309 ** collection. (Higher values mean coarser collections. 0 represents

   310 ** infinity, where each step performs a full collection.) You can also

   311 ** change this value dynamically.

   312 */

   313 #define LUAI_GCMUL	200 /* GC runs 'twice the speed' of memory allocation */

   314 

   315 

   316 

   317 /*

   318 @@ LUA_COMPAT_GETN controls compatibility with old getn behavior.

   319 ** CHANGE it (define it) if you want exact compatibility with the

   320 ** behavior of setn/getn in Lua 5.0.

   321 */

   322 #undef LUA_COMPAT_GETN

   323 

   324 /*

   325 @@ LUA_COMPAT_LOADLIB controls compatibility about global loadlib.

   326 ** CHANGE it to undefined as soon as you do not need a global 'loadlib'

   327 ** function (the function is still available as 'package.loadlib').

   328 */

   329 #undef LUA_COMPAT_LOADLIB

   330 

   331 /*

   332 @@ LUA_COMPAT_VARARG controls compatibility with old vararg feature.

   333 ** CHANGE it to undefined as soon as your programs use only '...' to

   334 ** access vararg parameters (instead of the old 'arg' table).

   335 */

   336 #define LUA_COMPAT_VARARG

   337 

   338 /*

   339 @@ LUA_COMPAT_MOD controls compatibility with old math.mod function.

   340 ** CHANGE it to undefined as soon as your programs use 'math.fmod' or

   341 ** the new '%' operator instead of 'math.mod'.

   342 */

   343 #define LUA_COMPAT_MOD

   344 

   345 /*

   346 @@ LUA_COMPAT_LSTR controls compatibility with old long string nesting

   347 @* facility.

   348 ** CHANGE it to 2 if you want the old behaviour, or undefine it to turn

   349 ** off the advisory error when nesting [[...]].

   350 */

   351 #define LUA_COMPAT_LSTR		1

   352 

   353 /*

   354 @@ LUA_COMPAT_GFIND controls compatibility with old 'string.gfind' name.

   355 ** CHANGE it to undefined as soon as you rename 'string.gfind' to

   356 ** 'string.gmatch'.

   357 */

   358 #define LUA_COMPAT_GFIND

   359 

   360 /*

   361 @@ LUA_COMPAT_OPENLIB controls compatibility with old 'luaL_openlib'

   362 @* behavior.

   363 ** CHANGE it to undefined as soon as you replace to 'luaL_register'

   364 ** your uses of 'luaL_openlib'

   365 */

   366 #define LUA_COMPAT_OPENLIB

   367 

   368 

   369 

   370 /*

   371 @@ luai_apicheck is the assert macro used by the Lua-C API.

   372 ** CHANGE luai_apicheck if you want Lua to perform some checks in the

   373 ** parameters it gets from API calls. This may slow down the interpreter

   374 ** a bit, but may be quite useful when debugging C code that interfaces

   375 ** with Lua. A useful redefinition is to use assert.h.

   376 */

   377 #if defined(LUA_USE_APICHECK)

   378 #include <assert.h>

   379 #define luai_apicheck(L,o)	{ (void)L; assert(o); }

   380 #else

   381 #define luai_apicheck(L,o)	{ (void)L; }

   382 #endif

   383 

   384 

   385 /*

   386 @@ LUAI_BITSINT defines the number of bits in an int.

   387 ** CHANGE here if Lua cannot automatically detect the number of bits of

   388 ** your machine. Probably you do not need to change this.

   389 */

   390 /* avoid overflows in comparison */

   391 #if INT_MAX-20 < 32760

   392 #define LUAI_BITSINT	16

   393 #elif INT_MAX > 2147483640L

   394 /* int has at least 32 bits */

   395 #define LUAI_BITSINT	32

   396 #else

   397 #error "you must define LUA_BITSINT with number of bits in an integer"

   398 #endif

   399 

   400 

   401 /*

   402 @@ LUAI_UINT32 is an unsigned integer with at least 32 bits.

   403 @@ LUAI_INT32 is an signed integer with at least 32 bits.

   404 @@ LUAI_UMEM is an unsigned integer big enough to count the total

   405 @* memory used by Lua.

   406 @@ LUAI_MEM is a signed integer big enough to count the total memory

   407 @* used by Lua.

   408 ** CHANGE here if for some weird reason the default definitions are not

   409 ** good enough for your machine. (The definitions in the 'else'

   410 ** part always works, but may waste space on machines with 64-bit

   411 ** longs.) Probably you do not need to change this.

   412 */

   413 #if LUAI_BITSINT >= 32

   414 #define LUAI_UINT32	unsigned int

   415 #define LUAI_INT32	int

   416 #define LUAI_MAXINT32	INT_MAX

   417 #define LUAI_UMEM	size_t

   418 #define LUAI_MEM	ptrdiff_t

   419 #else

   420 /* 16-bit ints */

   421 #define LUAI_UINT32	unsigned long

   422 #define LUAI_INT32	long

   423 #define LUAI_MAXINT32	LONG_MAX

   424 #define LUAI_UMEM	unsigned long

   425 #define LUAI_MEM	long

   426 #endif

   427 

   428 

   429 /*

   430 @@ LUAI_MAXCALLS limits the number of nested calls.

   431 ** CHANGE it if you need really deep recursive calls. This limit is

   432 ** arbitrary; its only purpose is to stop infinite recursion before

   433 ** exhausting memory.

   434 */

   435 #define LUAI_MAXCALLS	20000

   436 

   437 

   438 /*

   439 @@ LUAI_MAXCSTACK limits the number of Lua stack slots that a C function

   440 @* can use.

   441 ** CHANGE it if you need lots of (Lua) stack space for your C

   442 ** functions. This limit is arbitrary; its only purpose is to stop C

   443 ** functions to consume unlimited stack space. (must be smaller than

   444 ** -LUA_REGISTRYINDEX)

   445 */

   446 #define LUAI_MAXCSTACK	8000

   447 

   448 

   449 

   450 /*

   451 ** {==================================================================

   452 ** CHANGE (to smaller values) the following definitions if your system

   453 ** has a small C stack. (Or you may want to change them to larger

   454 ** values if your system has a large C stack and these limits are

   455 ** too rigid for you.) Some of these constants control the size of

   456 ** stack-allocated arrays used by the compiler or the interpreter, while

   457 ** others limit the maximum number of recursive calls that the compiler

   458 ** or the interpreter can perform. Values too large may cause a C stack

   459 ** overflow for some forms of deep constructs.

   460 ** ===================================================================

   461 */

   462 

   463 

   464 /*

   465 @@ LUAI_MAXCCALLS is the maximum depth for nested C calls (short) and

   466 @* syntactical nested non-terminals in a program.

   467 */

   468 #define LUAI_MAXCCALLS		200

   469 

   470 

   471 /*

   472 @@ LUAI_MAXVARS is the maximum number of local variables per function

   473 @* (must be smaller than 250).

   474 */

   475 #define LUAI_MAXVARS		200

   476 

   477 

   478 /*

   479 @@ LUAI_MAXUPVALUES is the maximum number of upvalues per function

   480 @* (must be smaller than 250).

   481 */

   482 #define LUAI_MAXUPVALUES	60

   483 

   484 

   485 /*

   486 @@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.

   487 */

   488 #define LUAL_BUFFERSIZE		BUFSIZ

   489 

   490 /* }================================================================== */

   491 

   492 

   493 

   494 

   495 /*

   496 ** {==================================================================

   497 @@ LUA_NUMBER is the type of numbers in Lua.

   498 ** CHANGE the following definitions only if you want to build Lua

   499 ** with a number type different from double. You may also need to

   500 ** change lua_number2int & lua_number2integer.

   501 ** ===================================================================

   502 */

   503 

   504 #define LUA_NUMBER_DOUBLE

   505 #define LUA_NUMBER	double

   506 

   507 /*

   508 @@ LUAI_UACNUMBER is the result of an 'usual argument conversion'

   509 @* over a number.

   510 */

   511 #define LUAI_UACNUMBER	double

   512 

   513 

   514 /*

   515 @@ LUA_NUMBER_SCAN is the format for reading numbers.

   516 @@ LUA_NUMBER_FMT is the format for writing numbers.

   517 @@ lua_number2str converts a number to a string.

   518 @@ LUAI_MAXNUMBER2STR is maximum size of previous conversion.

   519 @@ lua_str2number converts a string to a number.

   520 */

   521 #define LUA_NUMBER_SCAN		"%lf"

   522 #define LUA_NUMBER_FMT		"%.14g"

   523 #define lua_number2str(s,n)	sprintf((s), LUA_NUMBER_FMT, (n))

   524 #define LUAI_MAXNUMBER2STR	32 /* 16 digits, sign, point, and \0 */

   525 #define lua_str2number(s,p)	strtod((s), (p))

   526 

   527 

   528 /*

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

   530 */

   531 #if defined(LUA_CORE)

   532 #include <math.h>

   533 #define luai_numadd(a,b)	((a)+(b))

   534 #define luai_numsub(a,b)	((a)-(b))

   535 #define luai_nummul(a,b)	((a)*(b))

   536 #define luai_numdiv(a,b)	((a)/(b))

   537 #define luai_nummod(a,b)	((a) - floor((a)/(b))*(b))

   538 #define luai_numpow(a,b)	(pow(a,b))

   539 #define luai_numunm(a)		(-(a))

   540 #define luai_numeq(a,b)		((a)==(b))

   541 #define luai_numlt(a,b)		((a)<(b))

   542 #define luai_numle(a,b)		((a)<=(b))

   543 #define luai_numisnan(a)	(!luai_numeq((a), (a)))

   544 #endif

   545 

   546 

   547 /*

   548 @@ lua_number2int is a macro to convert lua_Number to int.

   549 @@ lua_number2integer is a macro to convert lua_Number to lua_Integer.

   550 ** CHANGE them if you know a faster way to convert a lua_Number to

   551 ** int (with any rounding method and without throwing errors) in your

   552 ** system. In Pentium machines, a naive typecast from double to int

   553 ** in C is extremely slow, so any alternative is worth trying.

   554 */

   555 

   556 /* On a Pentium, resort to a trick */

   557 #if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && !defined(__SSE2__) && \

   558     (defined(__i386) || defined (_M_IX86) || defined(__i386__))

   559 

   560 /* On a Microsoft compiler, use assembler */

   561 #if defined(_MSC_VER)

   562 

   563 #define lua_number2int(i,d)   __asm fld d   __asm fistp i

   564 #define lua_number2integer(i,n)		lua_number2int(i, n)

   565 

   566 /* the next trick should work on any Pentium, but sometimes clashes

   567    with a DirectX idiosyncrasy */

   568 #else

   569 

   570 union luai_Cast { double l_d; long l_l; };

   571 #define lua_number2int(i,d) \

   572   { volatile union luai_Cast u; u.l_d = (d) + 6755399441055744.0; (i) = u.l_l; }

   573 #define lua_number2integer(i,n)		lua_number2int(i, n)

   574 

   575 #endif

   576 

   577 

   578 /* this option always works, but may be slow */

   579 #else

   580 #define lua_number2int(i,d)	((i)=(int)(d))

   581 #define lua_number2integer(i,d)	((i)=(lua_Integer)(d))

   582 

   583 #endif

   584 

   585 /* }================================================================== */

   586 

   587 

   588 /*

   589 @@ LUAI_USER_ALIGNMENT_T is a type that requires maximum alignment.

   590 ** CHANGE it if your system requires alignments larger than double. (For

   591 ** instance, if your system supports long doubles and they must be

   592 ** aligned in 16-byte boundaries, then you should add long double in the

   593 ** union.) Probably you do not need to change this.

   594 */

   595 #define LUAI_USER_ALIGNMENT_T	union { double u; void *s; long l; }

   596 

   597 

   598 /*

   599 @@ LUAI_THROW/LUAI_TRY define how Lua does exception handling.

   600 ** CHANGE them if you prefer to use longjmp/setjmp even with C++

   601 ** or if want/don't to use _longjmp/_setjmp instead of regular

   602 ** longjmp/setjmp. By default, Lua handles errors with exceptions when

   603 ** compiling as C++ code, with _longjmp/_setjmp when asked to use them,

   604 ** and with longjmp/setjmp otherwise.

   605 */

   606 #if defined(__cplusplus)

   607 /* C++ exceptions */

   608 #define LUAI_THROW(L,c)	throw(c)

   609 #define LUAI_TRY(L,c,a)	try { a } catch(...) \

   610 	{ if ((c)->status == 0) (c)->status = -1; }

   611 #define luai_jmpbuf	int  /* dummy variable */

   612 

   613 #elif defined(LUA_USE_ULONGJMP)

   614 /* in Unix, try _longjmp/_setjmp (more efficient) */

   615 #define LUAI_THROW(L,c)	_longjmp((c)->b, 1)

   616 #define LUAI_TRY(L,c,a)	if (_setjmp((c)->b) == 0) { a }

   617 #define luai_jmpbuf	jmp_buf

   618 

   619 #else

   620 /* default handling with long jumps */

   621 #define LUAI_THROW(L,c)	longjmp((c)->b, 1)

   622 #define LUAI_TRY(L,c,a)	if (setjmp((c)->b) == 0) { a }

   623 #define luai_jmpbuf	jmp_buf

   624 

   625 #endif

   626 

   627 

   628 /*

   629 @@ LUA_MAXCAPTURES is the maximum number of captures that a pattern

   630 @* can do during pattern-matching.

   631 ** CHANGE it if you need more captures. This limit is arbitrary.

   632 */

   633 #define LUA_MAXCAPTURES		32

   634 

   635 

   636 /*

   637 @@ lua_tmpnam is the function that the OS library uses to create a

   638 @* temporary name.

   639 @@ LUA_TMPNAMBUFSIZE is the maximum size of a name created by lua_tmpnam.

   640 ** CHANGE them if you have an alternative to tmpnam (which is considered

   641 ** insecure) or if you want the original tmpnam anyway.  By default, Lua

   642 ** uses tmpnam except when POSIX is available, where it uses mkstemp.

   643 */

   644 #if defined(loslib_c) || defined(luaall_c)

   645 

   646 #if defined(LUA_USE_MKSTEMP)

   647 #include <unistd.h>

   648 #define LUA_TMPNAMBUFSIZE	32

   649 #define lua_tmpnam(b,e)	{ \

   650 	strcpy(b, "/tmp/lua_XXXXXX"); \

   651 	e = mkstemp(b); \

   652 	if (e != -1) close(e); \

   653 	e = (e == -1); }

   654 

   655 #else

   656 #define LUA_TMPNAMBUFSIZE	L_tmpnam

   657 #define lua_tmpnam(b,e)		{ e = (tmpnam(b) == NULL); }

   658 #endif

   659 

   660 #endif

   661 

   662 

   663 /*

   664 @@ lua_popen spawns a new process connected to the current one through

   665 @* the file streams.

   666 ** CHANGE it if you have a way to implement it in your system.

   667 */

   668 #if defined(LUA_USE_POPEN)

   669 

   670 #define lua_popen(L,c,m)	((void)L, fflush(NULL), popen(c,m))

   671 #define lua_pclose(L,file)	((void)L, (pclose(file) != -1))

   672 

   673 #elif defined(LUA_WIN)

   674 

   675 #define lua_popen(L,c,m)	((void)L, _popen(c,m))

   676 #define lua_pclose(L,file)	((void)L, (_pclose(file) != -1))

   677 

   678 #else

   679 

   680 #define lua_popen(L,c,m)	((void)((void)c, m),  \

   681 		luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)

   682 #define lua_pclose(L,file)		((void)((void)L, file), 0)

   683 

   684 #endif

   685 

   686 /*

   687 @@ LUA_DL_* define which dynamic-library system Lua should use.

   688 ** CHANGE here if Lua has problems choosing the appropriate

   689 ** dynamic-library system for your platform (either Windows' DLL, Mac's

   690 ** dyld, or Unix's dlopen). If your system is some kind of Unix, there

   691 ** is a good chance that it has dlopen, so LUA_DL_DLOPEN will work for

   692 ** it.  To use dlopen you also need to adapt the src/Makefile (probably

   693 ** adding -ldl to the linker options), so Lua does not select it

   694 ** automatically.  (When you change the makefile to add -ldl, you must

   695 ** also add -DLUA_USE_DLOPEN.)

   696 ** If you do not want any kind of dynamic library, undefine all these

   697 ** options.

   698 ** By default, _WIN32 gets LUA_DL_DLL and MAC OS X gets LUA_DL_DYLD.

   699 */

   700 #if defined(LUA_USE_DLOPEN)

   701 #define LUA_DL_DLOPEN

   702 #endif

   703 

   704 #if defined(LUA_WIN)

   705 #define LUA_DL_DLL

   706 #endif

   707 

   708 

   709 /*

   710 @@ LUAI_EXTRASPACE allows you to add user-specific data in a lua_State

   711 @* (the data goes just *before* the lua_State pointer).

   712 ** CHANGE (define) this if you really need that. This value must be

   713 ** a multiple of the maximum alignment required for your machine.

   714 */

   715 #define LUAI_EXTRASPACE		0

   716 

   717 

   718 /*

   719 @@ luai_userstate* allow user-specific actions on threads.

   720 ** CHANGE them if you defined LUAI_EXTRASPACE and need to do something

   721 ** extra when a thread is created/deleted/resumed/yielded.

   722 */

   723 #define luai_userstateopen(L)		((void)L)

   724 #define luai_userstateclose(L)		((void)L)

   725 #define luai_userstatethread(L,L1)	((void)L)

   726 #define luai_userstatefree(L)		((void)L)

   727 #define luai_userstateresume(L,n)	((void)L)

   728 #define luai_userstateyield(L,n)	((void)L)

   729 

   730 

   731 /*

   732 @@ LUA_INTFRMLEN is the length modifier for integer conversions

   733 @* in 'string.format'.

   734 @@ LUA_INTFRM_T is the integer type correspoding to the previous length

   735 @* modifier.

   736 ** CHANGE them if your system supports long long or does not support long.

   737 */

   738 

   739 #if defined(LUA_USELONGLONG)

   740 

   741 #define LUA_INTFRMLEN		"ll"

   742 #define LUA_INTFRM_T		long long

   743 

   744 #else

   745 

   746 #define LUA_INTFRMLEN		"l"

   747 #define LUA_INTFRM_T		long

   748 

   749 #endif

   750 

   751 

   752 

   753 /* =================================================================== */

   754 

   755 /*

   756 ** Local configuration. You can use this space to add your redefinitions

   757 ** without modifying the main part of the file.

   758 */

   759 

   760 

   761 

   762 #endif

   763