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c.h

/*-------------------------------------------------------------------------
 *
 * c.h
 *      Fundamental C definitions.  This is included by every .c file in
 *      PostgreSQL (via either postgres.h or postgres_fe.h, as appropriate).
 *
 *      Note that the definitions here are not intended to be exposed to clients
 *      of the frontend interface libraries --- so we don't worry much about
 *      polluting the namespace with lots of stuff...
 *
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL$
 *
 *-------------------------------------------------------------------------
 */
/*
 *----------------------------------------------------------------
 *     TABLE OF CONTENTS
 *
 *          When adding stuff to this file, please try to put stuff
 *          into the relevant section, or add new sections as appropriate.
 *
 *      section   description
 *      -------   ------------------------------------------------
 *          0)          pg_config.h and standard system headers
 *          1)          hacks to cope with non-ANSI C compilers
 *          2)          bool, true, false, TRUE, FALSE, NULL
 *          3)          standard system types
 *          4)          IsValid macros for system types
 *          5)          offsetof, lengthof, endof, alignment
 *          6)          widely useful macros
 *          7)          random stuff
 *          8)          system-specific hacks
 *
 * NOTE: since this file is included by both frontend and backend modules, it's
 * almost certainly wrong to put an "extern" declaration here.    typedefs and
 * macros are the kind of thing that might go here.
 *
 *----------------------------------------------------------------
 */
#ifndef C_H
#define C_H

/*
 * We have to include stdlib.h here because it defines many of these macros
 * on some platforms, and we only want our definitions used if stdlib.h doesn't
 * have its own.  The same goes for stddef and stdarg if present.
 */

#include "pg_config.h"
#include "pg_config_manual.h" /* must be after pg_config.h */
#if !defined(WIN32) && !defined(__CYGWIN__)           /* win32 will include further
                                                                         * down */
#include "pg_config_os.h"           /* must be before any system header files */
#endif
#include "postgres_ext.h"

#if _MSC_VER >= 1400
#define errcode __msvc_errcode
#include <crtdefs.h>
#undef errcode
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <stdarg.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include <sys/types.h>

#include <errno.h>
#if defined(WIN32) || defined(__CYGWIN__)
#include <fcntl.h>                        /* ensure O_BINARY is available */
#endif
#ifdef HAVE_SUPPORTDEFS_H
#include <SupportDefs.h>
#endif

#if defined(WIN32) || defined(__CYGWIN__)
/* We have to redefine some system functions after they are included above. */
#include "pg_config_os.h"
#endif

/* Must be before gettext() games below */
#include <locale.h>

#define _(x) gettext(x)

#ifdef ENABLE_NLS
#include <libintl.h>
#else
#define gettext(x) (x)
#define dgettext(d,x) (x)
#define ngettext(s,p,n) ((n) == 1 ? (s) : (p))
#define dngettext(d,s,p,n) ((n) == 1 ? (s) : (p))
#endif

/*
 *    Use this to mark string constants as needing translation at some later
 *    time, rather than immediately.  This is useful for cases where you need
 *    access to the original string and translated string, and for cases where
 *    immediate translation is not possible, like when initializing global
 *    variables.
 *          http://www.gnu.org/software/autoconf/manual/gettext/Special-cases.html
 */
#define gettext_noop(x) (x)


/* ----------------------------------------------------------------
 *                      Section 1: hacks to cope with non-ANSI C compilers
 *
 * type prefixes (const, signed, volatile, inline) are handled in pg_config.h.
 * ----------------------------------------------------------------
 */

/*
 * CppAsString
 *          Convert the argument to a string, using the C preprocessor.
 * CppConcat
 *          Concatenate two arguments together, using the C preprocessor.
 *
 * Note: the standard Autoconf macro AC_C_STRINGIZE actually only checks
 * whether #identifier works, but if we have that we likely have ## too.
 */
#if defined(HAVE_STRINGIZE)

#define CppAsString(identifier) #identifier
#define CppConcat(x, y)             x##y
#else                                     /* !HAVE_STRINGIZE */

#define CppAsString(identifier) "identifier"

/*
 * CppIdentity -- On Reiser based cpp's this is used to concatenate
 *          two tokens.  That is
 *                      CppIdentity(A)B ==> AB
 *          We renamed it to _private_CppIdentity because it should not
 *          be referenced outside this file.  On other cpp's it
 *          produces  A  B.
 */
#define _priv_CppIdentity(x)x
#define CppConcat(x, y)             _priv_CppIdentity(x)y
#endif   /* !HAVE_STRINGIZE */

/*
 * dummyret is used to set return values in macros that use ?: to make
 * assignments.  gcc wants these to be void, other compilers like char
 */
#ifdef __GNUC__                           /* GNU cc */
#define dummyret  void
#else
#define dummyret  char
#endif

#ifndef __GNUC__
#define __attribute__(_arg_)
#endif

/* ----------------------------------------------------------------
 *                      Section 2:  bool, true, false, TRUE, FALSE, NULL
 * ----------------------------------------------------------------
 */

/*
 * bool
 *          Boolean value, either true or false.
 *
 * XXX for C++ compilers, we assume the compiler has a compatible
 * built-in definition of bool.
 */

#ifndef __cplusplus

#ifndef bool
typedef char bool;
#endif

#ifndef true
#define true      ((bool) 1)
#endif

#ifndef false
#define false     ((bool) 0)
#endif
#endif   /* not C++ */

typedef bool *BoolPtr;

#ifndef TRUE
#define TRUE      1
#endif

#ifndef FALSE
#define FALSE     0
#endif

/*
 * NULL
 *          Null pointer.
 */
#ifndef NULL
#define NULL      ((void *) 0)
#endif


/* ----------------------------------------------------------------
 *                      Section 3:  standard system types
 * ----------------------------------------------------------------
 */

/*
 * Pointer
 *          Variable holding address of any memory resident object.
 *
 *          XXX Pointer arithmetic is done with this, so it can't be void *
 *          under "true" ANSI compilers.
 */
typedef char *Pointer;

/*
 * intN
 *          Signed integer, EXACTLY N BITS IN SIZE,
 *          used for numerical computations and the
 *          frontend/backend protocol.
 */
#ifndef HAVE_INT8
typedef signed char int8;           /* == 8 bits */
typedef signed short int16;         /* == 16 bits */
typedef signed int int32;           /* == 32 bits */
#endif   /* not HAVE_INT8 */

/*
 * uintN
 *          Unsigned integer, EXACTLY N BITS IN SIZE,
 *          used for numerical computations and the
 *          frontend/backend protocol.
 */
#ifndef HAVE_UINT8
typedef unsigned char uint8;  /* == 8 bits */
typedef unsigned short uint16;      /* == 16 bits */
typedef unsigned int uint32;  /* == 32 bits */
#endif   /* not HAVE_UINT8 */

/*
 * bitsN
 *          Unit of bitwise operation, AT LEAST N BITS IN SIZE.
 */
typedef uint8 bits8;                /* >= 8 bits */
typedef uint16 bits16;              /* >= 16 bits */
typedef uint32 bits32;              /* >= 32 bits */

/*
 * 64-bit integers
 */
#ifdef HAVE_LONG_INT_64
/* Plain "long int" fits, use it */

#ifndef HAVE_INT64
typedef long int int64;
#endif
#ifndef HAVE_UINT64
typedef unsigned long int uint64;
#endif
#elif defined(HAVE_LONG_LONG_INT_64)
/* We have working support for "long long int", use that */

#ifndef HAVE_INT64
typedef long long int int64;
#endif
#ifndef HAVE_UINT64
typedef unsigned long long int uint64;
#endif
#else                                     /* not HAVE_LONG_INT_64 and not
                                                 * HAVE_LONG_LONG_INT_64 */

/* Won't actually work, but fall back to long int so that code compiles */
#ifndef HAVE_INT64
typedef long int int64;
#endif
#ifndef HAVE_UINT64
typedef unsigned long int uint64;
#endif

#define INT64_IS_BUSTED
#endif   /* not HAVE_LONG_INT_64 and not
                                                 * HAVE_LONG_LONG_INT_64 */

/* Decide if we need to decorate 64-bit constants */
#ifdef HAVE_LL_CONSTANTS
#define INT64CONST(x)  ((int64) x##LL)
#define UINT64CONST(x) ((uint64) x##ULL)
#else
#define INT64CONST(x)  ((int64) x)
#define UINT64CONST(x) ((uint64) x)
#endif


/* Select timestamp representation (float8 or int64) */
#if defined(USE_INTEGER_DATETIMES) && !defined(INT64_IS_BUSTED)
#define HAVE_INT64_TIMESTAMP
#endif

/* sig_atomic_t is required by ANSI C, but may be missing on old platforms */
#ifndef HAVE_SIG_ATOMIC_T
typedef int sig_atomic_t;
#endif

/*
 * Size
 *          Size of any memory resident object, as returned by sizeof.
 */
typedef size_t Size;

/*
 * Index
 *          Index into any memory resident array.
 *
 * Note:
 *          Indices are non negative.
 */
typedef unsigned int Index;

/*
 * Offset
 *          Offset into any memory resident array.
 *
 * Note:
 *          This differs from an Index in that an Index is always
 *          non negative, whereas Offset may be negative.
 */
typedef signed int Offset;

/*
 * Common Postgres datatype names (as used in the catalogs)
 */
typedef int16 int2;
typedef int32 int4;
typedef float float4;
typedef double float8;

/*
 * Oid, RegProcedure, TransactionId, SubTransactionId, MultiXactId,
 * CommandId
 */

/* typedef Oid is in postgres_ext.h */

/*
 * regproc is the type name used in the include/catalog headers, but
 * RegProcedure is the preferred name in C code.
 */
typedef Oid regproc;
typedef regproc RegProcedure;

typedef uint32 TransactionId;

typedef uint32 LocalTransactionId;

typedef uint32 SubTransactionId;

#define InvalidSubTransactionId           ((SubTransactionId) 0)
#define TopSubTransactionId               ((SubTransactionId) 1)

/* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */
typedef TransactionId MultiXactId;

typedef uint32 MultiXactOffset;

typedef uint32 CommandId;

#define FirstCommandId  ((CommandId) 0)

/*
 * Array indexing support
 */
#define MAXDIM 6
typedef struct
{
      int               indx[MAXDIM];
} IntArray;

/* ----------------
 *          Variable-length datatypes all share the 'struct varlena' header.
 *
 * NOTE: for TOASTable types, this is an oversimplification, since the value
 * may be compressed or moved out-of-line.      However datatype-specific routines
 * are mostly content to deal with de-TOASTed values only, and of course
 * client-side routines should never see a TOASTed value.  But even in a
 * de-TOASTed value, beware of touching vl_len_ directly, as its representation
 * is no longer convenient.  It's recommended that code always use the VARDATA,
 * VARSIZE, and SET_VARSIZE macros instead of relying on direct mentions of
 * the struct fields.  See postgres.h for details of the TOASTed form.
 * ----------------
 */
struct varlena
{
      char        vl_len_[4];       /* Do not touch this field directly! */
      char        vl_dat[1];
};

#define VARHDRSZ        ((int32) sizeof(int32))

/*
 * These widely-used datatypes are just a varlena header and the data bytes.
 * There is no terminating null or anything like that --- the data length is
 * always VARSIZE(ptr) - VARHDRSZ.
 */
typedef struct varlena bytea;
typedef struct varlena text;
typedef struct varlena BpChar;      /* blank-padded char, ie SQL char(n) */
typedef struct varlena VarChar; /* var-length char, ie SQL varchar(n) */

/*
 * Specialized array types.  These are physically laid out just the same
 * as regular arrays (so that the regular array subscripting code works
 * with them).    They exist as distinct types mostly for historical reasons:
 * they have nonstandard I/O behavior which we don't want to change for fear
 * of breaking applications that look at the system catalogs.  There is also
 * an implementation issue for oidvector: it's part of the primary key for
 * pg_proc, and we can't use the normal btree array support routines for that
 * without circularity.
 */
typedef struct
{
      int32       vl_len_;          /* these fields must match ArrayType! */
      int               ndim;             /* always 1 for int2vector */
      int32       dataoffset;       /* always 0 for int2vector */
      Oid               elemtype;
      int               dim1;
      int               lbound1;
      int2        values[1];        /* VARIABLE LENGTH ARRAY */
} int2vector;                             /* VARIABLE LENGTH STRUCT */

typedef struct
{
      int32       vl_len_;          /* these fields must match ArrayType! */
      int               ndim;             /* always 1 for oidvector */
      int32       dataoffset;       /* always 0 for oidvector */
      Oid               elemtype;
      int               dim1;
      int               lbound1;
      Oid               values[1];        /* VARIABLE LENGTH ARRAY */
} oidvector;                              /* VARIABLE LENGTH STRUCT */

/*
 * Representation of a Name: effectively just a C string, but null-padded to
 * exactly NAMEDATALEN bytes.  The use of a struct is historical.
 */
typedef struct nameData
{
      char        data[NAMEDATALEN];
} NameData;
typedef NameData *Name;

#define NameStr(name)   ((name).data)

/*
 * Support macros for escaping strings.  escape_backslash should be TRUE
 * if generating a non-standard-conforming string.    Prefixing a string
 * with ESCAPE_STRING_SYNTAX guarantees it is non-standard-conforming.
 * Beware of multiple evaluation of the "ch" argument!
 */
#define SQL_STR_DOUBLE(ch, escape_backslash)    \
      ((ch) == '\'' || ((ch) == '\\' && (escape_backslash)))

#define ESCAPE_STRING_SYNTAX  'E'

/* ----------------------------------------------------------------
 *                      Section 4:  IsValid macros for system types
 * ----------------------------------------------------------------
 */
/*
 * BoolIsValid
 *          True iff bool is valid.
 */
#define BoolIsValid(boolean)  ((boolean) == false || (boolean) == true)

/*
 * PointerIsValid
 *          True iff pointer is valid.
 */
#define PointerIsValid(pointer) ((void*)(pointer) != NULL)

/*
 * PointerIsAligned
 *          True iff pointer is properly aligned to point to the given type.
 */
#define PointerIsAligned(pointer, type) \
            (((long)(pointer) % (sizeof (type))) == 0)

#define OidIsValid(objectId)  ((bool) ((objectId) != InvalidOid))

#define RegProcedureIsValid(p)      OidIsValid(p)


/* ----------------------------------------------------------------
 *                      Section 5:  offsetof, lengthof, endof, alignment
 * ----------------------------------------------------------------
 */
/*
 * offsetof
 *          Offset of a structure/union field within that structure/union.
 *
 *          XXX This is supposed to be part of stddef.h, but isn't on
 *          some systems (like SunOS 4).
 */
#ifndef offsetof
#define offsetof(type, field) ((long) &((type *)0)->field)
#endif   /* offsetof */

/*
 * lengthof
 *          Number of elements in an array.
 */
#define lengthof(array) (sizeof (array) / sizeof ((array)[0]))

/*
 * endof
 *          Address of the element one past the last in an array.
 */
#define endof(array)    (&(array)[lengthof(array)])

/* ----------------
 * Alignment macros: align a length or address appropriately for a given type.
 * The fooALIGN() macros round up to a multiple of the required alignment,
 * while the fooALIGN_DOWN() macros round down.  The latter are more useful
 * for problems like "how many X-sized structures will fit in a page?".
 *
 * NOTE: TYPEALIGN[_DOWN] will not work if ALIGNVAL is not a power of 2.
 * That case seems extremely unlikely to be needed in practice, however.
 * ----------------
 */

#define TYPEALIGN(ALIGNVAL,LEN)  \
      (((long) (LEN) + ((ALIGNVAL) - 1)) & ~((long) ((ALIGNVAL) - 1)))

#define SHORTALIGN(LEN)             TYPEALIGN(ALIGNOF_SHORT, (LEN))
#define INTALIGN(LEN)               TYPEALIGN(ALIGNOF_INT, (LEN))
#define LONGALIGN(LEN)              TYPEALIGN(ALIGNOF_LONG, (LEN))
#define DOUBLEALIGN(LEN)            TYPEALIGN(ALIGNOF_DOUBLE, (LEN))
#define MAXALIGN(LEN)               TYPEALIGN(MAXIMUM_ALIGNOF, (LEN))
/* MAXALIGN covers only built-in types, not buffers */
#define BUFFERALIGN(LEN)            TYPEALIGN(ALIGNOF_BUFFER, (LEN))

#define TYPEALIGN_DOWN(ALIGNVAL,LEN)  \
      (((long) (LEN)) & ~((long) ((ALIGNVAL) - 1)))

#define SHORTALIGN_DOWN(LEN)  TYPEALIGN_DOWN(ALIGNOF_SHORT, (LEN))
#define INTALIGN_DOWN(LEN)          TYPEALIGN_DOWN(ALIGNOF_INT, (LEN))
#define LONGALIGN_DOWN(LEN)         TYPEALIGN_DOWN(ALIGNOF_LONG, (LEN))
#define DOUBLEALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_DOUBLE, (LEN))
#define MAXALIGN_DOWN(LEN)          TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN))

/* ----------------------------------------------------------------
 *                      Section 6:  widely useful macros
 * ----------------------------------------------------------------
 */
/*
 * Max
 *          Return the maximum of two numbers.
 */
#define Max(x, y)       ((x) > (y) ? (x) : (y))

/*
 * Min
 *          Return the minimum of two numbers.
 */
#define Min(x, y)       ((x) < (y) ? (x) : (y))

/*
 * Abs
 *          Return the absolute value of the argument.
 */
#define Abs(x)                ((x) >= 0 ? (x) : -(x))

/*
 * StrNCpy
 *    Like standard library function strncpy(), except that result string
 *    is guaranteed to be null-terminated --- that is, at most N-1 bytes
 *    of the source string will be kept.
 *    Also, the macro returns no result (too hard to do that without
 *    evaluating the arguments multiple times, which seems worse).
 *
 *    BTW: when you need to copy a non-null-terminated string (like a text
 *    datum) and add a null, do not do it with StrNCpy(..., len+1).  That
 *    might seem to work, but it fetches one byte more than there is in the
 *    text object.  One fine day you'll have a SIGSEGV because there isn't
 *    another byte before the end of memory.    Don't laugh, we've had real
 *    live bug reports from real live users over exactly this mistake.
 *    Do it honestly with "memcpy(dst,src,len); dst[len] = '\0';", instead.
 */
#define StrNCpy(dst,src,len) \
      do \
      { \
            char * _dst = (dst); \
            Size _len = (len); \
\
            if (_len > 0) \
            { \
                  strncpy(_dst, (src), _len); \
                  _dst[_len-1] = '\0'; \
            } \
      } while (0)


/* Get a bit mask of the bits set in non-long aligned addresses */
#define LONG_ALIGN_MASK (sizeof(long) - 1)

/*
 * MemSet
 *    Exactly the same as standard library function memset(), but considerably
 *    faster for zeroing small word-aligned structures (such as parsetree nodes).
 *    This has to be a macro because the main point is to avoid function-call
 *    overhead.   However, we have also found that the loop is faster than
 *    native libc memset() on some platforms, even those with assembler
 *    memset() functions.  More research needs to be done, perhaps with
 *    MEMSET_LOOP_LIMIT tests in configure.
 */
#define MemSet(start, val, len) \
      do \
      { \
            /* must be void* because we don't know if it is integer aligned yet */ \
            void   *_vstart = (void *) (start); \
            int         _val = (val); \
            Size  _len = (len); \
\
            if ((((long) _vstart) & LONG_ALIGN_MASK) == 0 && \
                  (_len & LONG_ALIGN_MASK) == 0 && \
                  _val == 0 && \
                  _len <= MEMSET_LOOP_LIMIT && \
                  /* \
                   *    If MEMSET_LOOP_LIMIT == 0, optimizer should find \
                   *    the whole "if" false at compile time. \
                   */ \
                  MEMSET_LOOP_LIMIT != 0) \
            { \
                  long *_start = (long *) _vstart; \
                  long *_stop = (long *) ((char *) _start + _len); \
                  while (_start < _stop) \
                        *_start++ = 0; \
            } \
            else \
                  memset(_vstart, _val, _len); \
      } while (0)

/*
 * MemSetAligned is the same as MemSet except it omits the test to see if
 * "start" is word-aligned.  This is okay to use if the caller knows a-priori
 * that the pointer is suitably aligned (typically, because he just got it
 * from palloc(), which always delivers a max-aligned pointer).
 */
#define MemSetAligned(start, val, len) \
      do \
      { \
            long   *_start = (long *) (start); \
            int         _val = (val); \
            Size  _len = (len); \
\
            if ((_len & LONG_ALIGN_MASK) == 0 && \
                  _val == 0 && \
                  _len <= MEMSET_LOOP_LIMIT && \
                  MEMSET_LOOP_LIMIT != 0) \
            { \
                  long *_stop = (long *) ((char *) _start + _len); \
                  while (_start < _stop) \
                        *_start++ = 0; \
            } \
            else \
                  memset(_start, _val, _len); \
      } while (0)


/*
 * MemSetTest/MemSetLoop are a variant version that allow all the tests in
 * MemSet to be done at compile time in cases where "val" and "len" are
 * constants *and* we know the "start" pointer must be word-aligned.
 * If MemSetTest succeeds, then it is okay to use MemSetLoop, otherwise use
 * MemSetAligned.  Beware of multiple evaluations of the arguments when using
 * this approach.
 */
#define MemSetTest(val, len) \
      ( ((len) & LONG_ALIGN_MASK) == 0 && \
      (len) <= MEMSET_LOOP_LIMIT && \
      MEMSET_LOOP_LIMIT != 0 && \
      (val) == 0 )

#define MemSetLoop(start, val, len) \
      do \
      { \
            long * _start = (long *) (start); \
            long * _stop = (long *) ((char *) _start + (Size) (len)); \
      \
            while (_start < _stop) \
                  *_start++ = 0; \
      } while (0)


/* ----------------------------------------------------------------
 *                      Section 7:  random stuff
 * ----------------------------------------------------------------
 */

/* msb for char */
#define HIGHBIT                           (0x80)
#define IS_HIGHBIT_SET(ch)          ((unsigned char)(ch) & HIGHBIT)

#define STATUS_OK                   (0)
#define STATUS_ERROR                (-1)
#define STATUS_EOF                        (-2)
#define STATUS_FOUND                (1)
#define STATUS_WAITING              (2)


/* gettext domain name mangling */

/*
 * To better support parallel installations of major PostgeSQL
 * versions as well as parallel installations of major library soname
 * versions, we mangle the gettext domain name by appending those
 * version numbers.  The coding rule ought to be that whereever the
 * domain name is mentioned as a literal, it must be wrapped into
 * PG_TEXTDOMAIN().  The macros below do not work on non-literals; but
 * that is somewhat intentional because it avoids having to worry
 * about multiple states of premangling and postmangling as the values
 * are being passed around.
 *
 * Make sure this matches the installation rules in nls-global.mk.
 */

/* need a second indirection because we want to stringize the macro value, not the name */
#define CppAsString2(x) CppAsString(x)

#ifdef SO_MAJOR_VERSION
# define PG_TEXTDOMAIN(domain) (domain CppAsString2(SO_MAJOR_VERSION) "-" PG_MAJORVERSION)
#else
# define PG_TEXTDOMAIN(domain) (domain "-" PG_MAJORVERSION)
#endif


/* ----------------------------------------------------------------
 *                      Section 8: system-specific hacks
 *
 *          This should be limited to things that absolutely have to be
 *          included in every source file.      The port-specific header file
 *          is usually a better place for this sort of thing.
 * ----------------------------------------------------------------
 */

/*
 *    NOTE:  this is also used for opening text files.
 *    WIN32 treats Control-Z as EOF in files opened in text mode.
 *    Therefore, we open files in binary mode on Win32 so we can read
 *    literal control-Z.      The other affect is that we see CRLF, but
 *    that is OK because we can already handle those cleanly.
 */
#if defined(WIN32) || defined(__CYGWIN__)
#define PG_BINARY O_BINARY
#define PG_BINARY_A "ab"
#define PG_BINARY_R "rb"
#define PG_BINARY_W "wb"
#else
#define PG_BINARY 0
#define PG_BINARY_A "a"
#define PG_BINARY_R "r"
#define PG_BINARY_W "w"
#endif

/*
 * Provide prototypes for routines not present in a particular machine's
 * standard C library.
 */

#if !HAVE_DECL_SNPRINTF
extern int
snprintf(char *str, size_t count, const char *fmt,...)
/* This extension allows gcc to check the format string */
__attribute__((format(printf, 3, 4)));
#endif

#if !HAVE_DECL_VSNPRINTF
extern int  vsnprintf(char *str, size_t count, const char *fmt, va_list args);
#endif

#if !defined(HAVE_MEMMOVE) && !defined(memmove)
#define memmove(d, s, c)            bcopy(s, d, c)
#endif

#ifndef PGDLLIMPORT
#define PGDLLIMPORT                       /* no special DLL markers on most ports */
#endif

/*
 * The following is used as the arg list for signal handlers.  Any ports
 * that take something other than an int argument should override this in
 * their pg_config_os.h file.  Note that variable names are required
 * because it is used in both the prototypes as well as the definitions.
 * Note also the long name.  We expect that this won't collide with
 * other names causing compiler warnings.
 */

#ifndef SIGNAL_ARGS
#define SIGNAL_ARGS  int postgres_signal_arg
#endif

/*
 * When there is no sigsetjmp, its functionality is provided by plain
 * setjmp. Incidentally, nothing provides setjmp's functionality in
 * that case.
 */
#ifndef HAVE_SIGSETJMP
#define sigjmp_buf jmp_buf
#define sigsetjmp(x,y) setjmp(x)
#define siglongjmp longjmp
#endif

#if defined(HAVE_FDATASYNC) && !HAVE_DECL_FDATASYNC
extern int  fdatasync(int fildes);
#endif

/* If strtoq() exists, rename it to the more standard strtoll() */
#if defined(HAVE_LONG_LONG_INT_64) && !defined(HAVE_STRTOLL) && defined(HAVE_STRTOQ)
#define strtoll strtoq
#define HAVE_STRTOLL 1
#endif

/* If strtouq() exists, rename it to the more standard strtoull() */
#if defined(HAVE_LONG_LONG_INT_64) && !defined(HAVE_STRTOULL) && defined(HAVE_STRTOUQ)
#define strtoull strtouq
#define HAVE_STRTOULL 1
#endif

/*
 * We assume if we have these two functions, we have their friends too, and
 * can use the wide-character functions.
 */
#if defined(HAVE_WCSTOMBS) && defined(HAVE_TOWLOWER)
#define USE_WIDE_UPPER_LOWER
#endif
   
/* EXEC_BACKEND defines */
#ifdef EXEC_BACKEND
#define NON_EXEC_STATIC
#else
#define NON_EXEC_STATIC static
#endif

/* /port compatibility functions */
#include "port.h"

#endif   /* C_H */

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