3 ** $Id: luaconf.h,v 1.259.1.1 2017/04/19 17:29:57 roberto Exp $
4 ** Configuration file for Lua
5 ** See Copyright Notice in lua.h
17 ** ===================================================================
18 ** Search for "@@" to find all configurable definitions.
19 ** ===================================================================
24 ** {====================================================================
25 ** System Configuration: macros to adapt (if needed) Lua to some
26 ** particular platform, for instance compiling it with 32-bit numbers or
27 ** restricting it to C89.
28 ** =====================================================================
32 @@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats. You
33 ** can also define LUA_32BITS in the make file, but changing here you
34 ** ensure that all software connected to Lua will be compiled with the
35 ** same configuration.
37 /* #define LUA_32BITS */
41 @@ LUA_USE_C89 controls the use of non-ISO-C89 features.
42 ** Define it if you want Lua to avoid the use of a few C99 features
43 ** or Windows-specific features on Windows.
45 /* #define LUA_USE_C89 */
49 ** By default, Lua on Windows use (some) specific Windows features
51 #if !defined(LUA_USE_C89) && defined(_WIN32) && !defined(_WIN32_WCE)
52 #define LUA_USE_WINDOWS /* enable goodies for regular Windows */
56 #if defined(LUA_USE_WINDOWS)
57 #define LUA_DL_DLL /* enable support for DLL */
58 #define LUA_USE_C89 /* broadly, Windows is C89 */
62 #if defined(LUA_USE_LINUX)
64 #define LUA_USE_DLOPEN /* needs an extra library: -ldl */
65 #define LUA_USE_READLINE /* needs some extra libraries */
69 #if defined(LUA_USE_MACOSX)
71 #define LUA_USE_DLOPEN /* MacOS does not need -ldl */
72 #define LUA_USE_READLINE /* needs an extra library: -lreadline */
75 /* Local modifications: need io.popen */
81 @@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for
82 ** C89 ('long' and 'double'); Windows always has '__int64', so it does
83 ** not need to use this case.
85 #if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS)
86 #define LUA_C89_NUMBERS
92 @@ LUAI_BITSINT defines the (minimum) number of bits in an 'int'.
94 /* avoid undefined shifts */
95 #if ((INT_MAX >> 15) >> 15) >= 1
96 #define LUAI_BITSINT 32
98 /* 'int' always must have at least 16 bits */
99 #define LUAI_BITSINT 16
104 @@ LUA_INT_TYPE defines the type for Lua integers.
105 @@ LUA_FLOAT_TYPE defines the type for Lua floats.
106 ** Lua should work fine with any mix of these options (if supported
107 ** by your C compiler). The usual configurations are 64-bit integers
108 ** and 'double' (the default), 32-bit integers and 'float' (for
109 ** restricted platforms), and 'long'/'double' (for C compilers not
110 ** compliant with C99, which may not have support for 'long long').
113 /* predefined options for LUA_INT_TYPE */
114 #define LUA_INT_INT 1
115 #define LUA_INT_LONG 2
116 #define LUA_INT_LONGLONG 3
118 /* predefined options for LUA_FLOAT_TYPE */
119 #define LUA_FLOAT_FLOAT 1
120 #define LUA_FLOAT_DOUBLE 2
121 #define LUA_FLOAT_LONGDOUBLE 3
123 #if defined(LUA_32BITS) /* { */
125 ** 32-bit integers and 'float'
127 #if LUAI_BITSINT >= 32 /* use 'int' if big enough */
128 #define LUA_INT_TYPE LUA_INT_INT
129 #else /* otherwise use 'long' */
130 #define LUA_INT_TYPE LUA_INT_LONG
132 #define LUA_FLOAT_TYPE LUA_FLOAT_FLOAT
134 #elif defined(LUA_C89_NUMBERS) /* }{ */
136 ** largest types available for C89 ('long' and 'double')
138 #define LUA_INT_TYPE LUA_INT_LONG
139 #define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
145 ** default configuration for 64-bit Lua ('long long' and 'double')
147 #if !defined(LUA_INT_TYPE)
148 #define LUA_INT_TYPE LUA_INT_LONGLONG
151 #if !defined(LUA_FLOAT_TYPE)
152 #define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
155 /* }================================================================== */
161 ** {==================================================================
162 ** Configuration for Paths.
163 ** ===================================================================
167 ** LUA_PATH_SEP is the character that separates templates in a path.
168 ** LUA_PATH_MARK is the string that marks the substitution points in a
170 ** LUA_EXEC_DIR in a Windows path is replaced by the executable's
173 #define LUA_PATH_SEP ";"
174 #define LUA_PATH_MARK "?"
175 #define LUA_EXEC_DIR "!"
179 @@ LUA_PATH_DEFAULT is the default path that Lua uses to look for
181 @@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for
183 ** CHANGE them if your machine has a non-conventional directory
184 ** hierarchy or if you want to install your libraries in
185 ** non-conventional directories.
187 #define LUA_VDIR LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
188 #if defined(_WIN32) /* { */
190 ** In Windows, any exclamation mark ('!') in the path is replaced by the
191 ** path of the directory of the executable file of the current process.
193 #define LUA_LDIR "!\\lua\\"
194 #define LUA_CDIR "!\\"
195 #define LUA_SHRDIR "!\\..\\share\\lua\\" LUA_VDIR "\\"
196 #define LUA_PATH_DEFAULT \
197 LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \
198 LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua;" \
199 LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \
200 ".\\?.lua;" ".\\?\\init.lua"
201 #define LUA_CPATH_DEFAULT \
203 LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \
204 LUA_CDIR"loadall.dll;" ".\\?.dll"
208 #define LUA_ROOT "/usr/local/"
209 #define LUA_LDIR LUA_ROOT "share/lua/" LUA_VDIR "/"
210 #define LUA_CDIR LUA_ROOT "lib/lua/" LUA_VDIR "/"
211 #if !defined(LUA_PATH_DEFAULT)
212 #define LUA_PATH_DEFAULT \
213 LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \
214 LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua;" \
215 "./?.lua;" "./?/init.lua"
217 #if !defined(LUA_CPATH_DEFAULT)
218 #define LUA_CPATH_DEFAULT \
219 LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"
225 @@ LUA_DIRSEP is the directory separator (for submodules).
226 ** CHANGE it if your machine does not use "/" as the directory separator
227 ** and is not Windows. (On Windows Lua automatically uses "\".)
230 #define LUA_DIRSEP "\\"
232 #define LUA_DIRSEP "/"
235 /* }================================================================== */
239 ** {==================================================================
240 ** Marks for exported symbols in the C code
241 ** ===================================================================
245 @@ LUA_API is a mark for all core API functions.
246 @@ LUALIB_API is a mark for all auxiliary library functions.
247 @@ LUAMOD_API is a mark for all standard library opening functions.
248 ** CHANGE them if you need to define those functions in some special way.
249 ** For instance, if you want to create one Windows DLL with the core and
250 ** the libraries, you may want to use the following definition (define
251 ** LUA_BUILD_AS_DLL to get it).
253 #if defined(LUA_BUILD_AS_DLL) /* { */
255 #if defined(LUA_CORE) || defined(LUA_LIB) /* { */
256 #define LUA_API __declspec(dllexport)
258 #define LUA_API __declspec(dllimport)
263 #define LUA_API extern
268 /* more often than not the libs go together with the core */
269 #define LUALIB_API LUA_API
270 #define LUAMOD_API LUALIB_API
274 @@ LUAI_FUNC is a mark for all extern functions that are not to be
275 ** exported to outside modules.
276 @@ LUAI_DDEF and LUAI_DDEC are marks for all extern (const) variables
277 ** that are not to be exported to outside modules (LUAI_DDEF for
278 ** definitions and LUAI_DDEC for declarations).
279 ** CHANGE them if you need to mark them in some special way. Elf/gcc
280 ** (versions 3.2 and later) mark them as "hidden" to optimize access
281 ** when Lua is compiled as a shared library. Not all elf targets support
282 ** this attribute. Unfortunately, gcc does not offer a way to check
283 ** whether the target offers that support, and those without support
284 ** give a warning about it. To avoid these warnings, change to the
285 ** default definition.
287 #if defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \
288 defined(__ELF__) /* { */
289 #define LUAI_FUNC __attribute__((visibility("hidden"))) extern
291 #define LUAI_FUNC extern
294 #define LUAI_DDEC LUAI_FUNC
295 #define LUAI_DDEF /* empty */
297 /* }================================================================== */
301 ** {==================================================================
302 ** Compatibility with previous versions
303 ** ===================================================================
307 @@ LUA_COMPAT_5_2 controls other macros for compatibility with Lua 5.2.
308 @@ LUA_COMPAT_5_1 controls other macros for compatibility with Lua 5.1.
309 ** You can define it to get all options, or change specific options
310 ** to fit your specific needs.
312 #if defined(LUA_COMPAT_5_2) /* { */
315 @@ LUA_COMPAT_MATHLIB controls the presence of several deprecated
316 ** functions in the mathematical library.
318 #define LUA_COMPAT_MATHLIB
321 @@ LUA_COMPAT_BITLIB controls the presence of library 'bit32'.
323 #define LUA_COMPAT_BITLIB
326 @@ LUA_COMPAT_IPAIRS controls the effectiveness of the __ipairs metamethod.
328 #define LUA_COMPAT_IPAIRS
331 @@ LUA_COMPAT_APIINTCASTS controls the presence of macros for
332 ** manipulating other integer types (lua_pushunsigned, lua_tounsigned,
333 ** luaL_checkint, luaL_checklong, etc.)
335 #define LUA_COMPAT_APIINTCASTS
340 #if defined(LUA_COMPAT_5_1) /* { */
342 /* Incompatibilities from 5.2 -> 5.3 */
343 #define LUA_COMPAT_MATHLIB
344 #define LUA_COMPAT_APIINTCASTS
347 @@ LUA_COMPAT_UNPACK controls the presence of global 'unpack'.
348 ** You can replace it with 'table.unpack'.
350 #define LUA_COMPAT_UNPACK
353 @@ LUA_COMPAT_LOADERS controls the presence of table 'package.loaders'.
354 ** You can replace it with 'package.searchers'.
356 #define LUA_COMPAT_LOADERS
359 @@ macro 'lua_cpcall' emulates deprecated function lua_cpcall.
360 ** You can call your C function directly (with light C functions).
362 #define lua_cpcall(L,f,u) \
363 (lua_pushcfunction(L, (f)), \
364 lua_pushlightuserdata(L,(u)), \
369 @@ LUA_COMPAT_LOG10 defines the function 'log10' in the math library.
370 ** You can rewrite 'log10(x)' as 'log(x, 10)'.
372 #define LUA_COMPAT_LOG10
375 @@ LUA_COMPAT_LOADSTRING defines the function 'loadstring' in the base
376 ** library. You can rewrite 'loadstring(s)' as 'load(s)'.
378 #define LUA_COMPAT_LOADSTRING
381 @@ LUA_COMPAT_MAXN defines the function 'maxn' in the table library.
383 #define LUA_COMPAT_MAXN
386 @@ The following macros supply trivial compatibility for some
387 ** changes in the API. The macros themselves document how to
388 ** change your code to avoid using them.
390 #define lua_strlen(L,i) lua_rawlen(L, (i))
392 #define lua_objlen(L,i) lua_rawlen(L, (i))
394 #define lua_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ)
395 #define lua_lessthan(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPLT)
398 @@ LUA_COMPAT_MODULE controls compatibility with previous
399 ** module functions 'module' (Lua) and 'luaL_register' (C).
401 #define LUA_COMPAT_MODULE
407 @@ LUA_COMPAT_FLOATSTRING makes Lua format integral floats without a
408 @@ a float mark ('.0').
409 ** This macro is not on by default even in compatibility mode,
410 ** because this is not really an incompatibility.
412 /* #define LUA_COMPAT_FLOATSTRING */
414 /* }================================================================== */
419 ** {==================================================================
420 ** Configuration for Numbers.
421 ** Change these definitions if no predefined LUA_FLOAT_* / LUA_INT_*
422 ** satisfy your needs.
423 ** ===================================================================
427 @@ LUA_NUMBER is the floating-point type used by Lua.
428 @@ LUAI_UACNUMBER is the result of a 'default argument promotion'
429 @@ over a floating number.
430 @@ l_mathlim(x) corrects limit name 'x' to the proper float type
431 ** by prefixing it with one of FLT/DBL/LDBL.
432 @@ LUA_NUMBER_FRMLEN is the length modifier for writing floats.
433 @@ LUA_NUMBER_FMT is the format for writing floats.
434 @@ lua_number2str converts a float to a string.
435 @@ l_mathop allows the addition of an 'l' or 'f' to all math operations.
436 @@ l_floor takes the floor of a float.
437 @@ lua_str2number converts a decimal numeric string to a number.
441 /* The following definitions are good for most cases here */
443 #define l_floor(x) (l_mathop(floor)(x))
445 #define lua_number2str(s,sz,n) \
446 l_sprintf((s), sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)(n))
449 @@ lua_numbertointeger converts a float number to an integer, or
450 ** returns 0 if float is not within the range of a lua_Integer.
451 ** (The range comparisons are tricky because of rounding. The tests
452 ** here assume a two-complement representation, where MININTEGER always
453 ** has an exact representation as a float; MAXINTEGER may not have one,
454 ** and therefore its conversion to float may have an ill-defined value.)
456 #define lua_numbertointeger(n,p) \
457 ((n) >= (LUA_NUMBER)(LUA_MININTEGER) && \
458 (n) < -(LUA_NUMBER)(LUA_MININTEGER) && \
459 (*(p) = (LUA_INTEGER)(n), 1))
462 /* now the variable definitions */
464 #if LUA_FLOAT_TYPE == LUA_FLOAT_FLOAT /* { single float */
466 #define LUA_NUMBER float
468 #define l_mathlim(n) (FLT_##n)
470 #define LUAI_UACNUMBER double
472 #define LUA_NUMBER_FRMLEN ""
473 #define LUA_NUMBER_FMT "%.7g"
475 #define l_mathop(op) op##f
477 #define lua_str2number(s,p) strtof((s), (p))
480 #elif LUA_FLOAT_TYPE == LUA_FLOAT_LONGDOUBLE /* }{ long double */
482 #define LUA_NUMBER long double
484 #define l_mathlim(n) (LDBL_##n)
486 #define LUAI_UACNUMBER long double
488 #define LUA_NUMBER_FRMLEN "L"
489 #define LUA_NUMBER_FMT "%.19Lg"
491 #define l_mathop(op) op##l
493 #define lua_str2number(s,p) strtold((s), (p))
495 #elif LUA_FLOAT_TYPE == LUA_FLOAT_DOUBLE /* }{ double */
497 #define LUA_NUMBER double
499 #define l_mathlim(n) (DBL_##n)
501 #define LUAI_UACNUMBER double
503 #define LUA_NUMBER_FRMLEN ""
504 #define LUA_NUMBER_FMT "%.14g"
506 #define l_mathop(op) op
508 #define lua_str2number(s,p) strtod((s), (p))
512 #error "numeric float type not defined"
519 @@ LUA_INTEGER is the integer type used by Lua.
521 @@ LUA_UNSIGNED is the unsigned version of LUA_INTEGER.
523 @@ LUAI_UACINT is the result of a 'default argument promotion'
524 @@ over a lUA_INTEGER.
525 @@ LUA_INTEGER_FRMLEN is the length modifier for reading/writing integers.
526 @@ LUA_INTEGER_FMT is the format for writing integers.
527 @@ LUA_MAXINTEGER is the maximum value for a LUA_INTEGER.
528 @@ LUA_MININTEGER is the minimum value for a LUA_INTEGER.
529 @@ lua_integer2str converts an integer to a string.
533 /* The following definitions are good for most cases here */
535 #define LUA_INTEGER_FMT "%" LUA_INTEGER_FRMLEN "d"
537 #define LUAI_UACINT LUA_INTEGER
539 #define lua_integer2str(s,sz,n) \
540 l_sprintf((s), sz, LUA_INTEGER_FMT, (LUAI_UACINT)(n))
543 ** use LUAI_UACINT here to avoid problems with promotions (which
544 ** can turn a comparison between unsigneds into a signed comparison)
546 #define LUA_UNSIGNED unsigned LUAI_UACINT
549 /* now the variable definitions */
551 #if LUA_INT_TYPE == LUA_INT_INT /* { int */
553 #define LUA_INTEGER int
554 #define LUA_INTEGER_FRMLEN ""
556 #define LUA_MAXINTEGER INT_MAX
557 #define LUA_MININTEGER INT_MIN
559 #elif LUA_INT_TYPE == LUA_INT_LONG /* }{ long */
561 #define LUA_INTEGER long
562 #define LUA_INTEGER_FRMLEN "l"
564 #define LUA_MAXINTEGER LONG_MAX
565 #define LUA_MININTEGER LONG_MIN
567 #elif LUA_INT_TYPE == LUA_INT_LONGLONG /* }{ long long */
569 /* use presence of macro LLONG_MAX as proxy for C99 compliance */
570 #if defined(LLONG_MAX) /* { */
571 /* use ISO C99 stuff */
573 #define LUA_INTEGER long long
574 #define LUA_INTEGER_FRMLEN "ll"
576 #define LUA_MAXINTEGER LLONG_MAX
577 #define LUA_MININTEGER LLONG_MIN
579 #elif defined(LUA_USE_WINDOWS) /* }{ */
580 /* in Windows, can use specific Windows types */
582 #define LUA_INTEGER __int64
583 #define LUA_INTEGER_FRMLEN "I64"
585 #define LUA_MAXINTEGER _I64_MAX
586 #define LUA_MININTEGER _I64_MIN
590 #error "Compiler does not support 'long long'. Use option '-DLUA_32BITS' \
591 or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for details)"
597 #error "numeric integer type not defined"
601 /* }================================================================== */
605 ** {==================================================================
606 ** Dependencies with C99 and other C details
607 ** ===================================================================
611 @@ l_sprintf is equivalent to 'snprintf' or 'sprintf' in C89.
612 ** (All uses in Lua have only one format item.)
614 #if !defined(LUA_USE_C89)
615 #define l_sprintf(s,sz,f,i) snprintf(s,sz,f,i)
617 #define l_sprintf(s,sz,f,i) ((void)(sz), sprintf(s,f,i))
622 @@ lua_strx2number converts an hexadecimal numeric string to a number.
623 ** In C99, 'strtod' does that conversion. Otherwise, you can
624 ** leave 'lua_strx2number' undefined and Lua will provide its own
627 #if !defined(LUA_USE_C89)
628 #define lua_strx2number(s,p) lua_str2number(s,p)
633 @@ lua_pointer2str converts a pointer to a readable string in a
634 ** non-specified way.
636 #define lua_pointer2str(buff,sz,p) l_sprintf(buff,sz,"%p",p)
640 @@ lua_number2strx converts a float to an hexadecimal numeric string.
641 ** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that.
642 ** Otherwise, you can leave 'lua_number2strx' undefined and Lua will
643 ** provide its own implementation.
645 #if !defined(LUA_USE_C89)
646 #define lua_number2strx(L,b,sz,f,n) \
647 ((void)L, l_sprintf(b,sz,f,(LUAI_UACNUMBER)(n)))
652 ** 'strtof' and 'opf' variants for math functions are not valid in
653 ** C89. Otherwise, the macro 'HUGE_VALF' is a good proxy for testing the
654 ** availability of these variants. ('math.h' is already included in
655 ** all files that use these macros.)
657 #if defined(LUA_USE_C89) || (defined(HUGE_VAL) && !defined(HUGE_VALF))
658 #undef l_mathop /* variants not available */
659 #undef lua_str2number
660 #define l_mathop(op) (lua_Number)op /* no variant */
661 #define lua_str2number(s,p) ((lua_Number)strtod((s), (p)))
666 @@ LUA_KCONTEXT is the type of the context ('ctx') for continuation
667 ** functions. It must be a numerical type; Lua will use 'intptr_t' if
668 ** available, otherwise it will use 'ptrdiff_t' (the nearest thing to
669 ** 'intptr_t' in C89)
671 #define LUA_KCONTEXT ptrdiff_t
673 #if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \
674 __STDC_VERSION__ >= 199901L
676 #if defined(INTPTR_MAX) /* even in C99 this type is optional */
678 #define LUA_KCONTEXT intptr_t
684 @@ lua_getlocaledecpoint gets the locale "radix character" (decimal point).
685 ** Change that if you do not want to use C locales. (Code using this
686 ** macro must include header 'locale.h'.)
688 #if !defined(lua_getlocaledecpoint)
689 #define lua_getlocaledecpoint() (localeconv()->decimal_point[0])
692 /* }================================================================== */
696 ** {==================================================================
697 ** Language Variations
698 ** =====================================================================
702 @@ LUA_NOCVTN2S/LUA_NOCVTS2N control how Lua performs some
703 ** coercions. Define LUA_NOCVTN2S to turn off automatic coercion from
704 ** numbers to strings. Define LUA_NOCVTS2N to turn off automatic
705 ** coercion from strings to numbers.
707 /* #define LUA_NOCVTN2S */
708 /* #define LUA_NOCVTS2N */
712 @@ LUA_USE_APICHECK turns on several consistency checks on the C API.
713 ** Define it as a help when debugging C code.
715 #if defined(LUA_USE_APICHECK)
717 #define luai_apicheck(l,e) assert(e)
720 /* }================================================================== */
724 ** {==================================================================
725 ** Macros that affect the API and must be stable (that is, must be the
726 ** same when you compile Lua and when you compile code that links to
727 ** Lua). You probably do not want/need to change them.
728 ** =====================================================================
732 @@ LUAI_MAXSTACK limits the size of the Lua stack.
733 ** CHANGE it if you need a different limit. This limit is arbitrary;
734 ** its only purpose is to stop Lua from consuming unlimited stack
735 ** space (and to reserve some numbers for pseudo-indices).
737 #if LUAI_BITSINT >= 32
738 #define LUAI_MAXSTACK 1000000
740 #define LUAI_MAXSTACK 15000
745 @@ LUA_EXTRASPACE defines the size of a raw memory area associated with
746 ** a Lua state with very fast access.
747 ** CHANGE it if you need a different size.
749 #define LUA_EXTRASPACE (sizeof(void *))
753 @@ LUA_IDSIZE gives the maximum size for the description of the source
754 @@ of a function in debug information.
755 ** CHANGE it if you want a different size.
757 #define LUA_IDSIZE 60
761 @@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
762 ** CHANGE it if it uses too much C-stack space. (For long double,
763 ** 'string.format("%.99f", -1e4932)' needs 5034 bytes, so a
764 ** smaller buffer would force a memory allocation for each call to
767 #if LUA_FLOAT_TYPE == LUA_FLOAT_LONGDOUBLE
768 #define LUAL_BUFFERSIZE 8192
770 #define LUAL_BUFFERSIZE ((int)(0x80 * sizeof(void*) * sizeof(lua_Integer)))
773 /* }================================================================== */
777 @@ LUA_QL describes how error messages quote program elements.
778 ** Lua does not use these macros anymore; they are here for
779 ** compatibility only.
781 #define LUA_QL(x) "'" x "'"
782 #define LUA_QS LUA_QL("%s")
787 /* =================================================================== */
790 ** Local configuration. You can use this space to add your redefinitions
791 ** without modifying the main part of the file.