stdio.h

C标准库源代码

/***
*stdio.h - definitions/declarations for standard I/O routines
*
*       Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       This file defines the structures, values, macros, and functions
*       used by the level 2 I/O ("standard I/O") routines.
*       [ANSI/System V]
*
*       [Public]
*
****/

#if _MSC_VER > 1000
#pragma once
#endif  /* _MSC_VER > 1000 */

#ifndef _INC_STDIO
#define _INC_STDIO

#if !defined (_WIN32) && !defined (_MAC)
#error ERROR: Only Mac or Win32 targets supported!
#endif  /* !defined (_WIN32) && !defined (_MAC) */

#ifndef _CRTBLD
/* This version of the header files is NOT for user programs.
 * It is intended for use when building the C runtimes ONLY.
 * The version intended for public use will not have this message.
 */
#error ERROR: Use of C runtime library internal header file.
#endif  /* _CRTBLD */

#ifdef _MSC_VER
/*
 * Currently, all MS C compilers for Win32 platforms default to 8 byte
 * alignment.
 */
#pragma pack(push,8)
#endif  /* _MSC_VER */

#ifdef __cplusplus
extern "C" {
#endif  /* __cplusplus */

#ifndef _INTERNAL_IFSTRIP_
#include <cruntime.h>
#endif  /* _INTERNAL_IFSTRIP_ */


/* Define _CRTIMP */

#ifndef _CRTIMP
#ifdef CRTDLL
#define _CRTIMP __declspec(dllexport)
#else  /* CRTDLL */
#ifdef _DLL
#define _CRTIMP __declspec(dllimport)
#else  /* _DLL */
#define _CRTIMP
#endif  /* _DLL */
#endif  /* CRTDLL */
#endif  /* _CRTIMP */


/* Define __cdecl for non-Microsoft compilers */

#if (!defined (_MSC_VER) && !defined (__cdecl))
#define __cdecl
#endif  /* (!defined (_MSC_VER) && !defined (__cdecl)) */

/* Define _CRTAPI1 (for compatibility with the NT SDK) */

#ifndef _CRTAPI1
#if _MSC_VER >= 800 && _M_IX86 >= 300
#define _CRTAPI1 __cdecl
#else  /* _MSC_VER >= 800 && _M_IX86 >= 300 */
#define _CRTAPI1
#endif  /* _MSC_VER >= 800 && _M_IX86 >= 300 */
#endif  /* _CRTAPI1 */


#ifndef _SIZE_T_DEFINED
typedef unsigned int size_t;
#define _SIZE_T_DEFINED
#endif  /* _SIZE_T_DEFINED */


#ifndef _MAC
#ifndef _WCHAR_T_DEFINED
typedef unsigned short wchar_t;
#define _WCHAR_T_DEFINED
#endif  /* _WCHAR_T_DEFINED */


#ifndef _WCTYPE_T_DEFINED
typedef wchar_t wint_t;
typedef wchar_t wctype_t;
#define _WCTYPE_T_DEFINED
#endif  /* _WCTYPE_T_DEFINED */
#endif  /* _MAC */


#ifndef _VA_LIST_DEFINED
#ifdef _M_ALPHA
typedef struct {
        char *a0;       /* pointer to first homed integer argument */
        int offset;     /* byte offset of next parameter */
} va_list;
#else  /* _M_ALPHA */
typedef char *  va_list;
#endif  /* _M_ALPHA */
#define _VA_LIST_DEFINED
#endif  /* _VA_LIST_DEFINED */


/* Buffered I/O macros */

#if defined (_M_MPPC)
#define BUFSIZ  4096
#else  /* defined (_M_MPPC) */
#define BUFSIZ  512
#endif  /* defined (_M_MPPC) */

#ifndef _INTERNAL_IFSTRIP_
/*
 * Real default size for stdio buffers
 */
#define _INTERNAL_BUFSIZ    4096
#define _SMALL_BUFSIZ       512
#endif  /* _INTERNAL_IFSTRIP_ */

/*
 * Default number of supported streams. _NFILE is confusing and obsolete, but
 * supported anyway for backwards compatibility.
 */
#define _NFILE      _NSTREAM_

#ifdef _WIN32

#define _NSTREAM_   512

/*
 * Number of entries in _iob[] (declared below). Note that _NSTREAM_ must be
 * greater than or equal to _IOB_ENTRIES.
 */
#define _IOB_ENTRIES 20

#else  /* _WIN32 */

#ifdef CRTDLL
#define _NSTREAM_   128         /* *MUST* match the value under ifdef _DLL! */
#else  /* CRTDLL */
#ifdef _DLL
#define _NSTREAM_   128
#else  /* _DLL */
#ifdef _MT
#define _NSTREAM_   40
#else  /* _MT */
#define _NSTREAM_   20
#endif  /* _MT */
#endif  /* _DLL */
#endif  /* CRTDLL */

#endif  /* _WIN32 */

#define EOF     (-1)


#ifndef _FILE_DEFINED
struct _iobuf {
        char *_ptr;
        int   _cnt;
        char *_base;
        int   _flag;
        int   _file;
        int   _charbuf;
        int   _bufsiz;
        char *_tmpfname;
        };
typedef struct _iobuf FILE;
#define _FILE_DEFINED
#endif  /* _FILE_DEFINED */


#ifndef _MAC

/* Directory where temporary files may be created. */

#define _P_tmpdir   "\\"
#define _wP_tmpdir  L"\\"

/* L_tmpnam = size of P_tmpdir
 *            + 1 (in case P_tmpdir does not end in "/")
 *            + 12 (for the filename string)
 *            + 1 (for the null terminator)
 */
#define L_tmpnam sizeof(_P_tmpdir)+12

#else  /* _MAC */

#define L_tmpnam 255

#endif  /* _MAC */




/* Seek method constants */

#define SEEK_CUR    1
#define SEEK_END    2
#define SEEK_SET    0


#define FILENAME_MAX    260
#define FOPEN_MAX       20
#define _SYS_OPEN       20
#define TMP_MAX         32767


/* Define NULL pointer value */

#ifndef NULL
#ifdef __cplusplus
#define NULL    0
#else  /* __cplusplus */
#define NULL    ((void *)0)
#endif  /* __cplusplus */
#endif  /* NULL */


/* Declare _iob[] array */

#ifndef _STDIO_DEFINED
#ifndef _INTERNAL_IFSTRIP_
#if defined (_DLL) && defined (_M_IX86)
/* Retained for compatibility with VC++ 5.0 and earlier versions */
_CRTIMP extern FILE * __cdecl __p__iob(void);
#endif  /* defined (_DLL) && defined (_M_IX86) */
#endif  /* _INTERNAL_IFSTRIP_ */
_CRTIMP extern FILE _iob[];
#endif  /* _STDIO_DEFINED */


/* Define file position type */

#ifndef _FPOS_T_DEFINED
#undef _FPOSOFF


#if !__STDC__ && _INTEGRAL_MAX_BITS >= 64   
typedef __int64 fpos_t;
#define _FPOSOFF(fp) ((long)(fp))
#else  /* !__STDC__ && _INTEGRAL_MAX_BITS >= 64    */