看不懂啊，帮忙啊
/* stdio.hDefinitions for stream input/output.
Copyright (c) 1987, 1991 by Borland International
All Rights Reserved.
*/
#ifndef __STDIO_H
#define __STDIO_H
#if !defined( __DEFS_H )
#include <_defs.h>
#endif
#ifndef NULL
#include <_null.h>
#endif
#ifndef _SIZE_T
#define _SIZE_T
typedef unsigned size_t;
#endif
/* Definition of the file position type
*/
typedef long fpos_t;
/* Definition of the control structure for streams
*/
typedef struct {
int level; /* fill/empty level of buffer */
unsigned flags; /* File status flags */
char fd; /* File descriptor */
unsigned char hold; /* Ungetc char if no buffer */
int bsize; /* Buffer size */
unsigned char *buffer; /* Data transfer buffer */
unsigned char *curp; /* Current active pointer */
unsigned istemp; /* Temporary file indicator */
short token; /* Used for validity checking */
} FILE; /* This is the FILE object */
/* Bufferisation type to be used as 3rd argument for "setvbuf" function
*/
#define _IOFBF 0
#define _IOLBF 1
#define _IONBF 2
/* "flags" bits definitions
*/
#define _F_RDWR 0x0003 /* Read/write flag */
#define _F_READ 0x0001 /* Read only file */
#define _F_WRIT 0x0002 /* Write only file */
#define _F_BUF 0x0004 /* Malloc'ed Buffer data */
#define _F_LBUF 0x0008 /* line-buffered file */
#define _F_ERR 0x0010 /* Error indicator */
#define _F_EOF 0x0020 /* EOF indicator */
#define _F_BIN 0x0040 /* Binary file indicator */
#define _F_IN 0x0080 /* Data is incoming */
#define _F_OUT 0x0100 /* Data is outgoing */
#define _F_TERM 0x0200 /* File is a terminal */
/* End-of-file constant definition
*/
#define EOF (-1) /* End of file indicator */
/* Number of files that can be open simultaneously
*/
#if __STDC__
#define FOPEN_MAX 18 /* Able to have 18 files (20 - stdaux & stdprn) */
#else
#define FOPEN_MAX 20 /* Able to have 20 files */
#define SYS_OPEN 20
#endif
#define FILENAME_MAX 80
/* Default buffer size use by "setbuf" function
*/
#define BUFSIZ 512 /* Buffer size for stdio */
/* Size of an arry large enough to hold a temporary file name string
*/
#define L_ctermid 5 /* CON: plus null byte */
#define P_tmpdir "" /* temporary directory */
#define L_tmpnam 13 /* tmpnam buffer size */
/* Constants to be used as 3rd argument for "fseek" function
*/
#define SEEK_CUR 1
#define SEEK_END 2
#define SEEK_SET 0
/* Number of unique file names that shall be generated by "tmpnam" function
*/
#define TMP_MAX 0xFFFF
/* Standard I/O predefined streams
*/
#if !defined( _RTLDLL )
extern FILE _Cdecl _streams[];
extern unsigned _Cdecl _nfile;
#define stdin (&_streams[0])
#define stdout (&_streams[1])
#define stderr (&_streams[2])
#if !__STDC__
#define stdaux (&_streams[3])
#define stdprn (&_streams[4])
#endif
#else
#ifdef __cplusplus
extern "C" {
#endif
FILE far * far __getStream(int);
#ifdef __cplusplus
}
#endif
#define stdin __getStream(0)
#define stdout __getStream(1)
#define stderr __getStream(2)
#define stdaux __getStream(3)
#define stdprn __getStream(4)
#endif
#ifdef __cplusplus
extern "C" {
#endif
void _Cdecl clearerr(FILE *__stream);
int _Cdecl fclose(FILE *__stream);
int _Cdecl fflush(FILE *__stream);
int _Cdecl fgetc(FILE *__stream);
int _Cdecl fgetpos(FILE *__stream, fpos_t *__pos);
char *_Cdecl fgets(char *__s, int __n, FILE *__stream);
FILE *_Cdecl fopen(const char *__path, const char *__mode);
int _Cdecl fprintf(FILE *__stream, const char *__format, ...);
int _Cdecl fputc(int __c, FILE *__stream);
int _Cdecl fputs(const char *__s, FILE *__stream);
size_t _Cdecl fread(void *__ptr, size_t __size, size_t __n,
FILE *__stream);
FILE *_Cdecl freopen(const char *__path, const char *__mode,
FILE *__stream);
int _Cdecl fscanf(FILE *__stream, const char *__format, ...);
int _Cdecl fseek(FILE *__stream, long __offset, int __whence);
int _Cdecl fsetpos(FILE *__stream, const fpos_t *__pos);
long _Cdecl ftell(FILE *__stream);
size_t _Cdecl fwrite(const void *__ptr, size_t __size, size_t __n,
FILE *__stream);
char *_Cdecl gets(char *__s);
void _Cdecl perror(const char *__s);
int _Cdecl printf(const char *__format, ...);
int _Cdecl puts(const char *__s);
int _CType remove(const char *__path);
int _CType rename(const char *__oldname,const char *__newname);
void _Cdecl rewind(FILE *__stream);
int _Cdecl scanf(const char *__format, ...);
void _Cdecl setbuf(FILE *__stream, char *__buf);
int _Cdecl setvbuf(FILE *__stream, char *__buf,
int __type, size_t __size);
int _Cdecl sprintf(char *__buffer, const char *__format, ...);
int _Cdecl sscanf(const char *__buffer,
const char *__format, ...);
char *_Cdecl strerror(int __errnum);
FILE *_Cdecl tmpfile(void);
char *_Cdecl tmpnam(char *__s);
int _Cdecl ungetc(int __c, FILE *__stream);
int _Cdecl vfprintf(FILE *__stream, const char *__format,
void *__arglist);
int _Cdecl vfscanf(FILE *__stream, const char *__format,
void *__arglist);
int _CType vprintf(const char *__format, void *__arglist);
int _Cdecl vscanf(const char *__format, void *__arglist);
int _Cdecl vsprintf(char *__buffer, const char *__format,
void *__arglist);
int _Cdecl vsscanf(const char *__buffer, const char *__format,
void *__arglist);
int _CType unlink(const char *__path);
int _Cdecl getc(FILE *__fp);
int _Cdecl getchar(void);
int _Cdecl putchar(const int __c);
int _Cdecl putc(const int __c, FILE *__fp);
int _Cdecl feof(FILE *__fp);
int _Cdecl ferror(FILE *__fp);
#if !__STDC__
int _Cdecl fcloseall(void);
FILE *_Cdecl fdopen(int __handle, char *__type);
int _Cdecl fgetchar(void);
int _Cdecl flushall(void);
int _Cdecl fputchar(int __c);
FILE * _Cdecl _fsopen (const char *__path, const char *__mode,
int __shflag);
int _Cdecl getw(FILE *__stream);
int _Cdecl putw(int __w, FILE *__stream);
int _Cdecl rmtmp(void);
char * _Cdecl _strerror(const char *__s);
char * _Cdecl tempnam(char *__dir, char *__pfx);
#define fileno(f) ((f)->fd)
#endif
int _Cdecl _fgetc(FILE *__stream); /* used by getc() macro */
int _Cdecl _fputc(char __c, FILE *__stream); /* used by putc() macro */
#ifdef __cplusplus
}
#endif
/* The following macros provide for common functions */
#define ferror(f) ((f)->flags & _F_ERR)
#define feof(f) ((f)->flags & _F_EOF)
#define getc(f) \
((--((f)->level) >= 0) ? (unsigned char)(*(f)->curp++) : \
_fgetc (f))
#define putc(c,f) \
((++((f)->level) < 0) ? (unsigned char)(*(f)->curp++=(c)) : \
_fputc ((c),f))
#define getchar() getc(stdin)
#define putchar(c) putc((c), stdout)
#define ungetc(c,f) ungetc((c),f) /* traditionally a macro */
#endif
看不懂的头文件！！那位大侠提点提点啊！！谢谢了
