553 lines
17 KiB
C
553 lines
17 KiB
C
#ifndef Py_PYPORT_H
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#define Py_PYPORT_H
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#include "pyconfig.h" /* include for defines */
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/**************************************************************************
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Symbols and macros to supply platform-independent interfaces to basic
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C language & library operations whose spellings vary across platforms.
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Please try to make documentation here as clear as possible: by definition,
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the stuff here is trying to illuminate C's darkest corners.
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Config #defines referenced here:
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SIGNED_RIGHT_SHIFT_ZERO_FILLS
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Meaning: To be defined iff i>>j does not extend the sign bit when i is a
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signed integral type and i < 0.
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Used in: Py_ARITHMETIC_RIGHT_SHIFT
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Py_DEBUG
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Meaning: Extra checks compiled in for debug mode.
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Used in: Py_SAFE_DOWNCAST
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HAVE_UINTPTR_T
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Meaning: The C9X type uintptr_t is supported by the compiler
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Used in: Py_uintptr_t
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HAVE_LONG_LONG
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Meaning: The compiler supports the C type "long long"
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Used in: LONG_LONG
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**************************************************************************/
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/* For backward compatibility only. Obsolete, do not use. */
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#ifdef HAVE_PROTOTYPES
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#define Py_PROTO(x) x
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#else
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#define Py_PROTO(x) ()
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#endif
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#ifndef Py_FPROTO
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#define Py_FPROTO(x) Py_PROTO(x)
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#endif
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/* typedefs for some C9X-defined synonyms for integral types.
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*
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* The names in Python are exactly the same as the C9X names, except with a
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* Py_ prefix. Until C9X is universally implemented, this is the only way
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* to ensure that Python gets reliable names that don't conflict with names
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* in non-Python code that are playing their own tricks to define the C9X
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* names.
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*
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* NOTE: don't go nuts here! Python has no use for *most* of the C9X
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* integral synonyms. Only define the ones we actually need.
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*/
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#ifdef HAVE_LONG_LONG
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#ifndef LONG_LONG
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#define LONG_LONG long long
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#endif
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#endif /* HAVE_LONG_LONG */
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/* uintptr_t is the C9X name for an unsigned integral type such that a
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* legitimate void* can be cast to uintptr_t and then back to void* again
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* without loss of information. Similarly for intptr_t, wrt a signed
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* integral type.
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*/
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#ifdef HAVE_UINTPTR_T
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typedef uintptr_t Py_uintptr_t;
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typedef intptr_t Py_intptr_t;
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#elif SIZEOF_VOID_P <= SIZEOF_INT
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typedef unsigned int Py_uintptr_t;
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typedef int Py_intptr_t;
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#elif SIZEOF_VOID_P <= SIZEOF_LONG
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typedef unsigned long Py_uintptr_t;
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typedef long Py_intptr_t;
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#elif defined(HAVE_LONG_LONG) && (SIZEOF_VOID_P <= SIZEOF_LONG_LONG)
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typedef unsigned LONG_LONG Py_uintptr_t;
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typedef LONG_LONG Py_intptr_t;
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#else
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# error "Python needs a typedef for Py_uintptr_t in pyport.h."
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#endif /* HAVE_UINTPTR_T */
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <math.h> /* Moved here from the math section, before extern "C" */
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/********************************************
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* WRAPPER FOR <time.h> and/or <sys/time.h> *
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********************************************/
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else /* !TIME_WITH_SYS_TIME */
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else /* !HAVE_SYS_TIME_H */
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#include <time.h>
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#endif /* !HAVE_SYS_TIME_H */
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#endif /* !TIME_WITH_SYS_TIME */
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/******************************
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* WRAPPER FOR <sys/select.h> *
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******************************/
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/* NB caller must include <sys/types.h> */
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif /* !HAVE_SYS_SELECT_H */
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/*******************************
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* stat() and fstat() fiddling *
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*******************************/
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/* We expect that stat and fstat exist on most systems.
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* It's confirmed on Unix, Mac and Windows.
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* If you don't have them, add
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* #define DONT_HAVE_STAT
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* and/or
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* #define DONT_HAVE_FSTAT
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* to your pyconfig.h. Python code beyond this should check HAVE_STAT and
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* HAVE_FSTAT instead.
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* Also
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* #define DONT_HAVE_SYS_STAT_H
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* if <sys/stat.h> doesn't exist on your platform, and
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* #define HAVE_STAT_H
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* if <stat.h> does (don't look at me -- ths mess is inherited).
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*/
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#ifndef DONT_HAVE_STAT
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#define HAVE_STAT
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#endif
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#ifndef DONT_HAVE_FSTAT
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#define HAVE_FSTAT
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#endif
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#ifdef RISCOS
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#include <sys/types.h>
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#endif
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#ifndef DONT_HAVE_SYS_STAT_H
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#if defined(PYOS_OS2) && defined(PYCC_GCC)
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#include <sys/types.h>
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#endif
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#include <sys/stat.h>
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#elif defined(HAVE_STAT_H)
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#include <stat.h>
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#endif
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#if defined(PYCC_VACPP)
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/* VisualAge C/C++ Failed to Define MountType Field in sys/stat.h */
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#define S_IFMT (S_IFDIR|S_IFCHR|S_IFREG)
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#endif
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#ifndef S_ISREG
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#define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
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#endif
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#ifndef S_ISDIR
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#define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
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#endif
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#ifdef __cplusplus
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/* Move this down here since some C++ #include's don't like to be included
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inside an extern "C" */
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extern "C" {
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#endif
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/* Py_ARITHMETIC_RIGHT_SHIFT
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* C doesn't define whether a right-shift of a signed integer sign-extends
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* or zero-fills. Here a macro to force sign extension:
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* Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J)
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* Return I >> J, forcing sign extension.
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* Requirements:
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* I is of basic signed type TYPE (char, short, int, long, or long long).
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* TYPE is one of char, short, int, long, or long long, although long long
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* must not be used except on platforms that support it.
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* J is an integer >= 0 and strictly less than the number of bits in TYPE
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* (because C doesn't define what happens for J outside that range either).
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* Caution:
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* I may be evaluated more than once.
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*/
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#ifdef SIGNED_RIGHT_SHIFT_ZERO_FILLS
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#define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) \
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((I) < 0 ? ~((~(unsigned TYPE)(I)) >> (J)) : (I) >> (J))
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#else
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#define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J))
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#endif
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/* Py_FORCE_EXPANSION(X)
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* "Simply" returns its argument. However, macro expansions within the
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* argument are evaluated. This unfortunate trickery is needed to get
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* token-pasting to work as desired in some cases.
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*/
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#define Py_FORCE_EXPANSION(X) X
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/* Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW)
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* Cast VALUE to type NARROW from type WIDE. In Py_DEBUG mode, this
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* assert-fails if any information is lost.
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* Caution:
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* VALUE may be evaluated more than once.
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*/
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#ifdef Py_DEBUG
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#define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) \
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(assert((WIDE)(NARROW)(VALUE) == (VALUE)), (NARROW)(VALUE))
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#else
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#define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) (NARROW)(VALUE)
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#endif
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/* Py_IS_INFINITY(X)
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* Return 1 if float or double arg is an infinity, else 0.
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* Caution:
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* X is evaluated more than once.
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* This implementation may set the underflow flag if |X| is very small;
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* it really can't be implemented correctly (& easily) before C99.
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*/
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#define Py_IS_INFINITY(X) ((X) && (X)*0.5 == (X))
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/* HUGE_VAL is supposed to expand to a positive double infinity. Python
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* uses Py_HUGE_VAL instead because some platforms are broken in this
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* respect. We used to embed code in pyport.h to try to worm around that,
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* but different platforms are broken in conflicting ways. If you're on
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* a platform where HUGE_VAL is defined incorrectly, fiddle your Python
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* config to #define Py_HUGE_VAL to something that works on your platform.
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*/
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#ifndef Py_HUGE_VAL
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#define Py_HUGE_VAL HUGE_VAL
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#endif
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/* Py_OVERFLOWED(X)
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* Return 1 iff a libm function overflowed. Set errno to 0 before calling
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* a libm function, and invoke this macro after, passing the function
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* result.
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* Caution:
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* This isn't reliable. C99 no longer requires libm to set errno under
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* any exceptional condition, but does require +- HUGE_VAL return
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* values on overflow. A 754 box *probably* maps HUGE_VAL to a
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* double infinity, and we're cool if that's so, unless the input
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* was an infinity and an infinity is the expected result. A C89
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* system sets errno to ERANGE, so we check for that too. We're
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* out of luck if a C99 754 box doesn't map HUGE_VAL to +Inf, or
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* if the returned result is a NaN, or if a C89 box returns HUGE_VAL
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* in non-overflow cases.
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* X is evaluated more than once.
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*/
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#define Py_OVERFLOWED(X) ((X) != 0.0 && (errno == ERANGE || \
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(X) == Py_HUGE_VAL || \
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(X) == -Py_HUGE_VAL))
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/* Py_SET_ERANGE_ON_OVERFLOW(x)
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* If a libm function did not set errno, but it looks like the result
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* overflowed, set errno to ERANGE. Set errno to 0 before calling a libm
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* function, and invoke this macro after, passing the function result.
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* Caution:
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* This isn't reliable. See Py_OVERFLOWED comments.
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* X is evaluated more than once.
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*/
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#define Py_SET_ERANGE_IF_OVERFLOW(X) \
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do { \
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if (errno == 0 && ((X) == Py_HUGE_VAL || \
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(X) == -Py_HUGE_VAL)) \
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errno = ERANGE; \
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} while(0)
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/* Py_ADJUST_ERANGE1(x)
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* Py_ADJUST_ERANGE2(x, y)
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* Set errno to 0 before calling a libm function, and invoke one of these
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* macros after, passing the function result(s) (Py_ADJUST_ERANGE2 is useful
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* for functions returning complex results). This makes two kinds of
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* adjustments to errno: (A) If it looks like the platform libm set
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* errno=ERANGE due to underflow, clear errno. (B) If it looks like the
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* platform libm overflowed but didn't set errno, force errno to ERANGE. In
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* effect, we're trying to force a useful implementation of C89 errno
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* behavior.
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* Caution:
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* This isn't reliable. See Py_OVERFLOWED comments.
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* X and Y may be evaluated more than once.
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*/
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#define Py_ADJUST_ERANGE1(X) \
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do { \
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if (errno == 0) { \
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if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL) \
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errno = ERANGE; \
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} \
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else if (errno == ERANGE && (X) == 0.0) \
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errno = 0; \
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} while(0)
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#define Py_ADJUST_ERANGE2(X, Y) \
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do { \
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if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL || \
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(Y) == Py_HUGE_VAL || (Y) == -Py_HUGE_VAL) { \
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if (errno == 0) \
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errno = ERANGE; \
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} \
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else if (errno == ERANGE) \
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errno = 0; \
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} while(0)
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/* Py_DEPRECATED(version)
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* Declare a macro or function deprecated.
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* Usage:
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* extern int old_var Py_DEPRECATED(2.3);
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* typedef int T1 Py_DEPRECATED(2.4);
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* extern int x() Py_DEPRECATED(2.5);
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*/
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#if defined(__GNUC__) && (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)
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#define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
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#else
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#define Py_DEPRECATED(VERSION_UNUSED)
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#endif
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/**************************************************************************
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Prototypes that are missing from the standard include files on some systems
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(and possibly only some versions of such systems.)
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Please be conservative with adding new ones, document them and enclose them
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in platform-specific #ifdefs.
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**************************************************************************/
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#ifdef SOLARIS
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/* Unchecked */
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extern int gethostname(char *, int);
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#endif
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#ifdef __BEOS__
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/* Unchecked */
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/* It's in the libs, but not the headers... - [cjh] */
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int shutdown( int, int );
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#endif
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#ifdef HAVE__GETPTY
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#include <sys/types.h> /* we need to import mode_t */
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extern char * _getpty(int *, int, mode_t, int);
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#endif
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#if defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY)
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#if !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H)
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/* BSDI does not supply a prototype for the 'openpty' and 'forkpty'
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functions, even though they are included in libutil. */
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#include <termios.h>
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extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
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extern int forkpty(int *, char *, struct termios *, struct winsize *);
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#endif /* !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H) */
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#endif /* defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) */
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/* These are pulled from various places. It isn't obvious on what platforms
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they are necessary, nor what the exact prototype should look like (which
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is likely to vary between platforms!) If you find you need one of these
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declarations, please move them to a platform-specific block and include
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proper prototypes. */
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#if 0
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/* From Modules/resource.c */
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extern int getrusage();
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extern int getpagesize();
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/* From Python/sysmodule.c and Modules/posixmodule.c */
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extern int fclose(FILE *);
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/* From Modules/posixmodule.c */
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extern int fdatasync(int);
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/* XXX These are supposedly for SunOS4.1.3 but "shouldn't hurt elsewhere" */
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extern int rename(const char *, const char *);
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extern int pclose(FILE *);
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extern int lstat(const char *, struct stat *);
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extern int symlink(const char *, const char *);
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extern int fsync(int fd);
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#endif /* 0 */
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/************************
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* WRAPPER FOR <math.h> *
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************************/
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#ifndef HAVE_HYPOT
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extern double hypot(double, double);
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#endif
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/* Declarations for symbol visibility.
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PyAPI_FUNC(type): Declares a public Python API function and return type
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PyAPI_DATA(type): Declares public Python data and its type
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PyMODINIT_FUNC: A Python module init function. If these functions are
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inside the Python core, they are private to the core.
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If in an extension module, it may be declared with
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external linkage depending on the platform.
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As a number of platforms support/require "__declspec(dllimport/dllexport)",
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we support a HAVE_DECLSPEC_DLL macro to save duplication.
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*/
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/*
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All windows ports, except cygwin, are handled in PC/pyconfig.h
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BeOS is only other autoconf platform requiring special linkage handling
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and both these use __declspec()
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*/
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#if defined(__CYGWIN__) || defined(__BEOS__)
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# define HAVE_DECLSPEC_DLL
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#endif
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#if defined(Py_ENABLE_SHARED) /* only get special linkage if built as shared */
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# if defined(HAVE_DECLSPEC_DLL)
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# ifdef Py_BUILD_CORE
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# define PyAPI_FUNC(RTYPE) __declspec(dllexport) RTYPE
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# define PyAPI_DATA(RTYPE) extern __declspec(dllexport) RTYPE
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/* module init functions inside the core need no external linkage */
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# define PyMODINIT_FUNC void
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# else /* Py_BUILD_CORE */
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/* Building an extension module, or an embedded situation */
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/* public Python functions and data are imported */
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# define PyAPI_FUNC(RTYPE) __declspec(dllimport) RTYPE
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# define PyAPI_DATA(RTYPE) extern __declspec(dllimport) RTYPE
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/* module init functions outside the core must be exported */
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# if defined(__cplusplus)
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# define PyMODINIT_FUNC extern "C" __declspec(dllexport) void
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# else /* __cplusplus */
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# define PyMODINIT_FUNC __declspec(dllexport) void
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# endif /* __cplusplus */
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# endif /* Py_BUILD_CORE */
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# endif /* HAVE_DECLSPEC */
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#endif /* Py_ENABLE_SHARED */
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/* If no external linkage macros defined by now, create defaults */
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#ifndef PyAPI_FUNC
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# define PyAPI_FUNC(RTYPE) RTYPE
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#endif
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#ifndef PyAPI_DATA
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# define PyAPI_DATA(RTYPE) extern RTYPE
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#endif
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#ifndef PyMODINIT_FUNC
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# if defined(__cplusplus)
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# define PyMODINIT_FUNC extern "C" void
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# else /* __cplusplus */
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# define PyMODINIT_FUNC void
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# endif /* __cplusplus */
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#endif
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/* Deprecated DL_IMPORT and DL_EXPORT macros */
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#if defined(Py_ENABLE_SHARED) && defined (HAVE_DECLSPEC_DLL)
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# if defined(Py_BUILD_CORE)
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# define DL_IMPORT(RTYPE) __declspec(dllexport) RTYPE
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# define DL_EXPORT(RTYPE) __declspec(dllexport) RTYPE
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# else
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# define DL_IMPORT(RTYPE) __declspec(dllimport) RTYPE
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# define DL_EXPORT(RTYPE) __declspec(dllexport) RTYPE
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# endif
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#endif
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#ifndef DL_EXPORT
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# define DL_EXPORT(RTYPE) RTYPE
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#endif
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#ifndef DL_IMPORT
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# define DL_IMPORT(RTYPE) RTYPE
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#endif
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/* End of deprecated DL_* macros */
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/* If the fd manipulation macros aren't defined,
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here is a set that should do the job */
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#if 0 /* disabled and probably obsolete */
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#ifndef FD_SETSIZE
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#define FD_SETSIZE 256
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#endif
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#ifndef FD_SET
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typedef long fd_mask;
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#define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif /* howmany */
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typedef struct fd_set {
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fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
|
|
} fd_set;
|
|
|
|
#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
|
|
#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
|
|
#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
|
|
#define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
|
|
|
|
#endif /* FD_SET */
|
|
|
|
#endif /* fd manipulation macros */
|
|
|
|
|
|
/* limits.h constants that may be missing */
|
|
|
|
#ifndef INT_MAX
|
|
#define INT_MAX 2147483647
|
|
#endif
|
|
|
|
#ifndef LONG_MAX
|
|
#if SIZEOF_LONG == 4
|
|
#define LONG_MAX 0X7FFFFFFFL
|
|
#elif SIZEOF_LONG == 8
|
|
#define LONG_MAX 0X7FFFFFFFFFFFFFFFL
|
|
#else
|
|
#error "could not set LONG_MAX in pyport.h"
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef LONG_MIN
|
|
#define LONG_MIN (-LONG_MAX-1)
|
|
#endif
|
|
|
|
#ifndef LONG_BIT
|
|
#define LONG_BIT (8 * SIZEOF_LONG)
|
|
#endif
|
|
|
|
#if LONG_BIT != 8 * SIZEOF_LONG
|
|
/* 04-Oct-2000 LONG_BIT is apparently (mis)defined as 64 on some recent
|
|
* 32-bit platforms using gcc. We try to catch that here at compile-time
|
|
* rather than waiting for integer multiplication to trigger bogus
|
|
* overflows.
|
|
*/
|
|
#error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Hide GCC attributes from compilers that don't support them.
|
|
*/
|
|
#if (!defined(__GNUC__) || __GNUC__ < 2 || \
|
|
(__GNUC__ == 2 && __GNUC_MINOR__ < 7) ) && \
|
|
!defined(RISCOS)
|
|
#define Py_GCC_ATTRIBUTE(x)
|
|
#else
|
|
#define Py_GCC_ATTRIBUTE(x) __attribute__(x)
|
|
#endif
|
|
|
|
#endif /* Py_PYPORT_H */
|