stdio.h

uc-osII操作系统在NXP公司的ARM微处理器LPC2214上的移植模板工程

/* stdio.h: ANSI 'C' (X3J11 Oct 88) library header, section 4.9 */
/* Copyright (C) Codemist Ltd., 1988-1993                       */
/* Copyright 1991-1998 ARM Limited. All rights reserved.        */

/*
 * RCS $Revision: 1.22.2.3 $
 * Checkin $Date: 2001/05/23 21:56:08 $
 * Revising $Author: sdouglas $
 */

/*
 * stdio.h declares two types, several macros, and many functions for
 * performing input and output. For a discussion on Streams and Files
 * refer to sections 4.9.2 and 4.9.3 in the above ANSI draft, or to a
 * modern textbook on C.
 */

#ifndef __stdio_h
#define __stdio_h

  #ifndef __STDIO_DECLS
  #define __STDIO_DECLS

    #undef __CLIBNS

    #ifdef __cplusplus
      #ifdef __EDG_RUNTIME_USES_NAMESPACES
      namespace std {
          #define __CLIBNS std::
      #else
        #define __CLIBNS ::
      #endif /* ifdef __EDG_RUNTIME_USES_NAMESPACES */

    extern "C" {
    #else
      #define __CLIBNS
    #endif  /* __cplusplus */

    #if defined(__cplusplus) || !defined(__STRICT_ANSI__)
     /* unconditional in C++ and non-strict C for consistency of debug info */
      typedef unsigned int size_t;
    #elif !defined(__size_t)
    #define __size_t 1
      typedef unsigned int size_t;   /* see <stddef.h> */
    #endif

    #undef NULL
    #define NULL 0                   /* see <stddef.h> */

/* ANSI forbids va_list to be defined here */
typedef int *__va_list[1];       /* keep in step with <stdarg.h> */

typedef struct __fpos_t_struct
{ unsigned long __lo;             /* add hi one day */
} fpos_t;
   /*
    * fpos_t is an object capable of recording all information needed to
    * specify uniquely every position within a file.
    */

typedef struct __FILE FILE;
   /*
    * FILE is an object capable of recording all information needed to control
    * a stream, such as its file position indicator, a pointer to its
    * associated buffer, an error indicator that records whether a read/write
    * error has occurred and an end-of-file indicator that records whether the
    * end-of-file has been reached.
    * Its structure is not made known to library clients.
    */

#define _IOFBF           0x100 /* fully buffered IO */
#define _IOLBF           0x200 /* line buffered IO */
#define _IONBF           0x400 /* unbuffered IO */

    /*
     * _IOBIN is the flag passed to _sys_write to denote a binary
     * file.
     */
#define _IOBIN            0x04     /* binary stream */

    /* Various default file IO buffer sizes */
#define BUFSIZ       (512)  /* system buffer size (as used by setbuf) */
#define STDIN_BUFSIZ  (64)  /* default stdin buffer size */
#define STDOUT_BUFSIZ (64)  /* default stdout buffer size */
#define STDERR_BUFSIZ (16)  /* default stderr buffer size */

#define EOF      (-1)
   /*
    * negative integral constant, indicates end-of-file, that is, no more input
    * from a stream.
    */
#define _SYS_OPEN 16
   /* _SYS_OPEN defines a limit on the number of open files that is imposed
    * by this C library
    */
#define FOPEN_MAX _SYS_OPEN
   /*
    * an integral constant expression that is the minimum number of files that
    * this implementation guarantees can be open simultaneously.
    */

#define FILENAME_MAX 80
   /*
    * an integral constant expression that is the size of an array of char
    * large enough to hold the longest filename string
    */
#define L_tmpnam FILENAME_MAX
   /*
    * an integral constant expression that is the size of an array of char
    * large enough to hold a temporary file name string generated by the
    * tmpnam function.
    */

#define SEEK_SET 0 /* start of stream (see fseek) */
#define SEEK_CUR 1 /* current position in stream (see fseek) */
#define SEEK_END 2 /* end of stream (see fseek) */

#define TMP_MAX 256
   /*
    * an integral constant expression that is the minimum number of unique
    * file names that shall be generated by the tmpnam function.
    */

extern FILE __stdin, __stdout, __stderr;

#define stdin  (&__CLIBNS __stdin)
   /* pointer to a FILE object associated with standard input stream */
#define stdout (&__CLIBNS __stdout)
   /* pointer to a FILE object associated with standard output stream */
#define stderr (&__CLIBNS __stderr)
   /* pointer to a FILE object associated with standard error stream */

extern int remove(const char * /*filename*/);
   /*
    * causes the file whose name is the string pointed to by filename to be
    * removed. Subsequent attempts to open the file will fail, unless it is
    * created anew. If the file is open, the behaviour of the remove function
    * is implementation-defined.
    * Returns: zero if the operation succeeds, nonzero if it fails.
    */
extern int rename(const char * /*old*/, const char * /*new*/);
   /*
    * causes the file whose name is the string pointed to by old to be
    * henceforth known by the name given by the string pointed to by new. The
    * file named old is effectively removed. If a file named by the string
    * pointed to by new exists prior to the call of the rename function, the
    * behaviour is implementation-defined.
    * Returns: zero if the operation succeeds, nonzero if it fails, in which
    *          case if the file existed previously it is still known by its
    *          original name.
    */
extern FILE *tmpfile(void);
   /*
    * creates a temporary binary file that will be automatically removed when
    * it is closed or at program termination. The file is opened for update.
    * Returns: a pointer to the stream of the file that it created. If the file
    *          cannot be created, a null pointer is returned.
    */
extern char *tmpnam(char * /*s*/);
   /*
    * generates a string that is not the same as the name of an existing file.
    * The tmpnam function generates a different string each time it is called,
    * up to TMP_MAX times. If it is called more than TMP_MAX times, the
    * behaviour is implementation-defined.
    * Returns: If the argument is a null pointer, the tmpnam function leaves
    *          its result in an internal static object and returns a pointer to
    *          that object. Subsequent calls to the tmpnam function may modify
    *          the same object. if the argument is not a null pointer, it is
    *          assumed to point to an array of at least L_tmpnam characters;
    *          the tmpnam function writes its result in that array and returns
    *          the argument as its value.
    */

extern int fclose(FILE * /*stream*/);
   /*
    * causes the stream pointed to by stream to be flushed and the associated
    * file to be closed. Any unwritten buffered data for the stream are
    * delivered to the host environment to be written to the file; any unread
    * buffered data are discarded. The stream is disassociated from the file.
    * If the associated buffer was automatically allocated, it is deallocated.
    * Returns: zero if the stream was succesfully closed, or nonzero if any
    *          errors were detected or if the stream was already closed.
    */
extern int fflush(FILE * /*stream*/);
   /*
    * If the stream points to an output or update stream in which the most
    * recent operation was output, the fflush function causes any unwritten
    * data for that stream to be delivered to the host environment to be
    * written to the file. If the stream points to an input or update stream,
    * the fflush function undoes the effect of any preceding ungetc operation
    * on the stream.
    * Returns: nonzero if a write error occurs.
    */
extern FILE *fopen(const char * /*filename*/, const char * /*mode*/);
   /*
    * opens the file whose name is the string pointed to by filename, and
    * associates a stream with it.
    * The argument mode points to a string beginning with one of the following
    * sequences:
    * "r"         open text file for reading
    * "w"         create text file for writing, or truncate to zero length
    * "a"         append; open text file or create for writing at eof
    * "rb"        open binary file for reading
    * "wb"        create binary file for writing, or truncate to zero length
    * "ab"        append; open binary file or create for writing at eof
    * "r+"        open text file for update (reading and writing)
    * "w+"        create text file for update, or truncate to zero length
    * "a+"        append; open text file or create for update, writing at eof
    * "r+b"/"rb+" open binary file for update (reading and writing)
    * "w+b"/"wb+" create binary file for update, or truncate to zero length
    * "a+b"/"ab+" append; open binary file or create for update, writing at eof
    *
    * Opening a file with read mode ('r' as the first character in the mode
    * argument) fails if the file does not exist or cannot be read.
    * Opening a file with append mode ('a' as the first character in the mode
    * argument) causes all subsequent writes to be forced to the current end of
    * file, regardless of intervening calls to the fseek function. In some
    * implementations, opening a binary file with append mode ('b' as the
    * second or third character in the mode argument) may initially position
    * the file position indicator beyond the last data written, because of the
    * NUL padding.
    * When a file is opened with update mode ('+' as the second or third
    * character in the mode argument), both input and output may be performed
    * on the associated stream. However, output may not be directly followed
    * by input without an intervening call to the fflush fuction or to a file
    * positioning function (fseek, fsetpos, or rewind), and input be not be
    * directly followed by output without an intervening call to the fflush
    * fuction or to a file positioning function, unless the input operation
    * encounters end-of-file. Opening a file with update mode may open or
    * create a binary stream in some implementations. When opened, a stream
    * is fully buffered if and only if it does not refer to an interactive
    * device. The error and end-of-file indicators for the stream are
    * cleared.
    * Returns: a pointer to the object controlling the stream. If the open
    *          operation fails, fopen returns a null pointer.
    */
extern FILE *freopen(const char * /*filename*/, const char * /*mode*/,
                     FILE * /*stream*/);
   /*
    * opens the file whose name is the string pointed to by filename and
    * associates the stream pointed to by stream with it. The mode argument is
    * used just as in the fopen function.
    * The freopen function first attempts to close any file that is associated
    * with the specified stream. Failure to close the file successfully is
    * ignored. The error and end-of-file indicators for the stream are cleared.
    * Returns: a null pointer if the operation fails. Otherwise, freopen
    *          returns the value of the stream.
    */
extern void setbuf(FILE * /*stream*/, char * /*buf*/);
   /*
    * Except that it returns no value, the setbuf function is equivalent to the
    * setvbuf function invoked with the values _IOFBF for mode and BUFSIZ for
    * size, or (if buf is a null pointer), with the value _IONBF for mode.
    * Returns: no value.
    */
extern int setvbuf(FILE * /*stream*/, char * /*buf*/,
                   int /*mode*/, size_t /*size*/);
   /*
    * may be used after the stream pointed to by stream has been associated
    * with an open file but before it is read or written. The argument mode
    * determines how stream will be buffered, as follows: _IOFBF causes
    * input/output to be fully buffered; _IOLBF causes output to be line
    * buffered (the buffer will be flushed when a new-line character is
    * written, when the buffer is full, or when input is requested); _IONBF
    * causes input/output to be completely unbuffered. If buf is not the null
    * pointer, the array it points to may be used instead of an automatically
    * allocated buffer (the buffer must have a lifetime at least as great as
    * the open stream, so the stream should be closed before a buffer that has
    * automatic storage duration is deallocated upon block exit). The argument
    * size specifies the size of the array. The contents of the array at any
    * time are indeterminate.
    * Returns: zero on success, or nonzero if an invalid value is given for
    *          mode or size, or if the request cannot be honoured.
    */
#ifdef __EDG__
#pragma __printf_args
#else
#pragma check_printf_formats   /* hint to the compiler to check f/s/printf format */
#endif
extern int fprintf(FILE * /*stream*/, const char * /*format*/, ...);
   /*
    * writes output to the stream pointed to by stream, under control of the
    * string pointed to by format that specifies how subsequent arguments are
    * converted for output. If there are insufficient arguments for the format,
    * the behaviour is undefined. If the format is exhausted while arguments
    * remain, the excess arguments are evaluated but otherwise ignored. The
    * fprintf function returns when the end of the format string is reached.
    * The format shall be a multibyte character sequence, beginning and ending
    * in its initial shift state. The format is composed of zero or more
    * directives: ordinary multibyte characters (not %), which are copied
    * unchanged to the output stream; and conversion specifiers, each of which
    * results in fetching zero or more subsequent arguments. Each conversion
    * specification is introduced by the character %. For a description of the
    * available conversion specifiers refer to section 4.9.6.1 in the ANSI
    * draft mentioned at the start of this file or to any modern textbook on C.
    * The minimum value for the maximum number of characters producable by any
    * single conversion is at least 509.
    * Returns: the number of characters transmitted, or a negative value if an
    *          output error occurred.