Subversion Repositories DevTools

#pragma force_top_level

#pragma include_only_once

/* stdio.h: ANSI 'C' (X3J11 Oct 88) library header, section 4.9 */

/* Copyright (C) Codemist Ltd., 1988-1993                       */

/* Copyright (C) Advanced Risc Machines Ltd., 1991-1998 -       */

/* All rights reserved */

/*

 * RCS $Revision: 1.6 $

 * Checkin $Date: 1998/05/19 09:54:37 $

 * Revising $Author: wdijkstr $

 */

/*

 * 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

#ifdef __cplusplus

extern "C" {

#endif

#ifndef __size_t

#define __size_t 1

typedef unsigned int size_t;   /* from <stddef.h> */

#endif

/* ANSI forbids va_list to be defined here */

typedef char *__va_list[1];       /* keep in step with <stdarg.h> */

#ifndef NULL

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

#endif

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 */

    /* 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.

    */

/* It is not clear to me what value FOPEN_MAX should have, so I will

   err in the cautious direction - ANSI requires it to be at least 8 */

#define FOPEN_MAX 8           /* check re arthur/unix/mvs */

   /*

    * an integral constant expression that is the minimum number of files that

    * this implementation guarantees can be open simultaneously.

    */

/* _SYS_OPEN defines a limit on the number of open files that is imposed

   by this C library */

#define _SYS_OPEN 16

#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  (&__stdin)

   /* pointer to a FILE object associated with standard input stream */

#define stdout (&__stdout)

   /* pointer to a FILE object associated with standard output stream */

#define stderr (&__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 (under RISCOS/Arthur/Brazil the operation

    * fails).

    * 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 (under RISCOS/Arthur/Brazil, the

    * operation fails).

    * 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 (under RISCOS/Arthur/Brazil the

    * algorithm for the name generation works just as well after tmpnam has

    * been called more than TMP_MAX times as before; a name clash is impossible

    * in any single half year period).

    * 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 (but not under RISCOS/Arthur/Brazil).

    * 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 (but not under RISCOS/

    * Arthur/Brazil). 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.

    */

#pragma -v1   /* hint to the compiler to check f/s/printf format */

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.

    */

extern int printf(const char * /*format*/, ...);

   /*

    * is equivalent to fprintf with the argument stdout interposed before the

    * arguments to printf.

    * Returns: the number of characters transmitted, or a negative value if an

    *          output error occurred.

    */

extern int sprintf(char * /*s*/, const char * /*format*/, ...);

   /*

    * is equivalent to fprintf, except that the argument s specifies an array

    * into which the generated output is to be written, rather than to a

    * stream. A null character is written at the end of the characters written;

    * it is not counted as part of the returned sum.

    * Returns: the number of characters written to the array, not counting the

    *          terminating null character.

    */

#pragma -v2   /* hint to the compiler to check f/s/scanf format */

extern int fscanf(FILE * /*stream*/, const char * /*format*/, ...);

   /*

    * reads input from the stream pointed to by stream, under control of the

    * string pointed to by format that specifies the admissible input sequences

    * and how thay are to be converted for assignment, using subsequent

    * arguments as pointers to the objects to receive the converted input. 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 format is composed of zero or more directives: one or more

    * white-space characters; an ordinary character (not %); or a conversion

    * specification. Each conversion specification is introduced by the

    * character %. For a description of the available conversion specifiers

    * refer to section 4.9.6.2 in the ANSI draft mentioned at the start of this

    * file, or to any modern textbook on C.

    * If end-of-file is encountered during input, conversion is terminated. If

    * end-of-file occurs before any characters matching the current directive

    * have been read (other than leading white space, where permitted),

    * execution of the current directive terminates with an input failure;

    * otherwise, unless execution of the current directive is terminated with a

    * matching failure, execution of the following directive (if any) is

    * terminated with an input failure.

    * If conversions terminates on a conflicting input character, the offending

    * input character is left unread in the input strem. Trailing white space

    * (including new-line characters) is left unread unless matched by a

    * directive. The success of literal matches and suppressed asignments is

    * not directly determinable other than via the %n directive.

    * Returns: the value of the macro EOF if an input failure occurs before any

    *          conversion. Otherwise, the fscanf function returns the number of

    *          input items assigned, which can be fewer than provided for, or

    *          even zero, in the event of an early conflict between an input

    *          character and the format.

    */

extern int scanf(const char * /*format*/, ...);

   /*

    * is equivalent to fscanf with the argument stdin interposed before the

    * arguments to scanf.

    * Returns: the value of the macro EOF if an input failure occurs before any

    *          conversion. Otherwise, the scanf function returns the number of

    *          input items assigned, which can be fewer than provided for, or

    *          even zero, in the event of an early matching failure.

    */

extern int sscanf(const char * /*s*/, const char * /*format*/, ...);

   /*

    * is equivalent to fscanf except that the argument s specifies a string

    * from which the input is to be obtained, rather than from a stream.

    * Reaching the end of the string is equivalent to encountering end-of-file

    * for the fscanf function.

    * Returns: the value of the macro EOF if an input failure occurs before any

    *          conversion. Otherwise, the scanf function returns the number of

    *          input items assigned, which can be fewer than provided for, or

    *          even zero, in the event of an early matching failure.

    */

#pragma -v0   /* back to default */

extern int vprintf(const char * /*format*/, __va_list /*arg*/);

   /*

    * is equivalent to printf, with the variable argument list replaced by arg,

    * which has been initialised by the va_start macro (and possibly subsequent

    * va_arg calls). The vprintf function does not invoke the va_end function.

    * Returns: the number of characters transmitted, or a negative value if an

    *          output error occurred.

    */

extern int vfprintf(FILE * /*stream*/,

                   const char * /*format*/, __va_list /*arg*/);

   /*

    * is equivalent to fprintf, with the variable argument list replaced by

    * arg, which has been initialised by the va_start macro (and possibly

    * subsequent va_arg calls). The vfprintf function does not invoke the

    * va_end function.

    * Returns: the number of characters transmitted, or a negative value if an

    *          output error occurred.

    */

extern int vsprintf(char * /*s*/, const char * /*format*/, __va_list /*arg*/);

   /*

    * is equivalent to sprintf, with the variable argument list replaced by

    * arg, which has been initialised by the va_start macro (and possibly

    * subsequent va_arg calls). The vsprintf function does not invoke the

    * va_end function.

    * Returns: the number of characters written in the array, not counting the

    *          terminating null character.

    */

extern int fgetc(FILE * /*stream*/);

   /*

    * obtains the next character (if present) as an unsigned char converted to

    * an int, from the input stream pointed to by stream, and advances the

    * associated file position indicator (if defined).

    * Returns: the next character from the input stream pointed to by stream.

    *          If the stream is at end-of-file, the end-of-file indicator is

    *          set and fgetc returns EOF. If a read error occurs, the error

    *          indicator is set and fgetc returns EOF.

    */

extern char *fgets(char * /*s*/, int /*n*/, FILE * /*stream*/);

   /*

    * reads at most one less than the number of characters specified by n from

    * the stream pointed to by stream into the array pointed to by s. No

    * additional characters are read after a new-line character (which is

    * retained) or after end-of-file. A null character is written immediately

    * after the last character read into the array.

    * Returns: s if successful. If end-of-file is encountered and no characters

    *          have been read into the array, the contents of the array remain

    *          unchanged and a null pointer is returned. If a read error occurs

    *          during the operation, the array contents are indeterminate and a

    *          null pointer is returned.

    */

extern int fputc(int /*c*/, FILE * /*stream*/);

   /*

    * writes the character specified by c (converted to an unsigned char) to

    * the output stream pointed to by stream, at the position indicated by the

    * asociated file position indicator (if defined), and advances the

    * indicator appropriately. If the file position indicator is not defined,

    * the character is appended to the output stream.

    * Returns: the character written. If a write error occurs, the error

    *          indicator is set and fputc returns EOF.

    */

extern int fputs(const char * /*s*/, FILE * /*stream*/);

   /*

    * writes the string pointed to by s to the stream pointed to by stream.

    * The terminating null character is not written.

    * Returns: EOF if a write error occurs; otherwise it returns a nonnegative

    *          value.

    */

extern int getc(FILE * /*stream*/);

   /*

    * is equivalent to fgetc except that it may be implemented as an unsafe

    * macro (stream may be evaluated more than once, so the argument should

    * never be an expression with side-effects).

    * Returns: the next character from the input stream pointed to by stream.

    *          If the stream is at end-of-file, the end-of-file indicator is

    *          set and getc returns EOF. If a read error occurs, the error

    *          indicator is set and getc returns EOF.

    */

#define getchar() getc(stdin)

extern int (getchar)(void);

   /*

    * is equivalent to getc with the argument stdin.

    * Returns: the next character from the input stream pointed to by stdin.

    *          If the stream is at end-of-file, the end-of-file indicator is

    *          set and getchar returns EOF. If a read error occurs, the error

    *          indicator is set and getchar returns EOF.

    */

extern char *gets(char * /*s*/);

   /*

    * reads characters from the input stream pointed to by stdin into the array

    * pointed to by s, until end-of-file is encountered or a new-line character

    * is read. Any new-line character is discarded, and a null character is

    * written immediately after the last character read into the array.

    * Returns: s if successful. If end-of-file is encountered and no characters

    *          have been read into the array, the contents of the array remain

    *          unchanged and a null pointer is returned. If a read error occurs

    *          during the operation, the array contents are indeterminate and a

    *          null pointer is returned.

    */

extern int putc(int /*c*/, FILE * /*stream*/);

   /*

    * is equivalent to fputc except that it may be implemented as aan unsafe

    * macro (stream may be evaluated more than once, so the argument should

    * never be an expression with side-effects).

    * Returns: the character written. If a write error occurs, the error

    *          indicator is set and putc returns EOF.

    */

#define putchar(ch) putc(ch, stdout)

extern int (putchar)(int /*c*/);

   /*

    * is equivalent to putc with the second argument stdout.

    * Returns: the character written. If a write error occurs, the error

    *          indicator is set and putc returns EOF.

    */

extern int puts(const char * /*s*/);

   /*

    * writes the string pointed to by s to the stream pointed to by stdout, and

    * appends a new-line character to the output. The terminating null

    * character is not written.

    * Returns: EOF if a write error occurs; otherwise it returns a nonnegative

    *          value.

    */

extern int ungetc(int /*c*/, FILE * /*stream*/);

   /*

    * pushes the character specified by c (converted to an unsigned char) back

    * onto the input stream pointed to by stream. The character will be

    * returned by the next read on that stream. An intervening call to the

    * fflush function or to a file positioning function (fseek, fsetpos,

    * rewind) discards any pushed-back characters. The external storage

    * corresponding to the stream is unchanged.

    * One character pushback is guaranteed. If the unget function is called too

    * many times on the same stream without an intervening read or file

    * positioning operation on that stream, the operation may fail.

    * If the value of c equals that of the macro EOF, the operation fails and

    * the input stream is unchanged.

    * A successful call to the ungetc function clears the end-of-file

    * indicator. The value of the file position indicator after reading or

    * discarding all pushed-back characters shall be the same as it was before

    * the characters were pushed back. For a text stream, the value of the file

    * position indicator after a successful call to the ungetc function is

    * unspecified until all pushed-back characters are read or discarded. For a

    * binary stream, the file position indicator is decremented by each

    * successful call to the ungetc function; if its value was zero before a

    * call, it is indeterminate after the call.

    * Returns: the character pushed back after conversion, or EOF if the

    *          operation fails.

    */

extern size_t fread(void * /*ptr*/,

                    size_t /*size*/, size_t /*nmemb*/, FILE * /*stream*/);

   /*

    * reads into the array pointed to by ptr, up to nmemb members whose size is

    * specified by size, from the stream pointed to by stream. The file

    * position indicator (if defined) is advanced by the number of characters

    * successfully read. If an error occurs, the resulting value of the file

    * position indicator is indeterminate. If a partial member is read, its

    * value is indeterminate. The ferror or feof function shall be used to

    * distinguish between a read error and end-of-file.

    * Returns: the number of members successfully read, which may be less than

    *          nmemb if a read error or end-of-file is encountered. If size or

    *          nmemb is zero, fread returns zero and the contents of the array

    *          and the state of the stream remain unchanged.

    */

extern size_t fwrite(const void * /*ptr*/,

                    size_t /*size*/, size_t /*nmemb*/, FILE * /*stream*/);

   /*

    * writes, from the array pointed to by ptr up to nmemb members whose size

    * is specified by size, to the stream pointed to by stream. The file

    * position indicator (if defined) is advanced by the number of characters

    * successfully written. If an error occurs, the resulting value of the file

    * position indicator is indeterminate.

    * Returns: the number of members successfully written, which will be less

    *          than nmemb only if a write error is encountered.

    */

extern int fgetpos(FILE * /*stream*/, fpos_t * /*pos*/);

   /*

    * stores the current value of the file position indicator for the stream

    * pointed to by stream in the object pointed to by pos. The value stored

    * contains unspecified information usable by the fsetpos function for

    * repositioning the stream to its position at the time  of the call to the

    * fgetpos function.

    * Returns: zero, if successful. Otherwise nonzero is returned and the

    *          integer expression errno is set to an implementation-defined

    *          nonzero value (under RISCOS/Arthur/Brazil fgetpos cannot fail).

    */

extern int fseek(FILE * /*stream*/, long int /*offset*/, int /*whence*/);

   /*

    * sets the file position indicator for the stream pointed to by stream.

    * For a binary stream, the new position is at the signed number of

    * characters specified by offset away from the point specified by whence.

    * The specified point is the beginning of the file for SEEK_SET, the

    * current position in the file for SEEK_CUR, or end-of-file for SEEK_END.

    * A binary stream need not meaningfully support fseek calls with a whence

    * value of SEEK_END.

    * For a text stream, either offset shall be zero, or offset shall be a

    * value returned by an earlier call to the ftell function on the same

    * stream and whence shall be SEEK_SET.

    * The fseek function clears the end-of-file indicator and undoes any

    * effects of the ungetc function on the same stream. After an fseek call,

    * the next operation on an update stream may be either input or output.

    * Returns: nonzero only for a request that cannot be satisfied.

    */

extern int fsetpos(FILE * /*stream*/, const fpos_t * /*pos*/);

   /*

    * sets  the file position indicator for the stream pointed to by stream

    * according to the value of the object pointed to by pos, which shall be a

    * value returned by an earlier call to the fgetpos function on the same

    * stream.

    * The fsetpos function clears the end-of-file indicator and undoes any

    * effects of the ungetc function on the same stream. After an fsetpos call,

    * the next operation on an update stream may be either input or output.

    * Returns: zero, if successful. Otherwise nonzero is returned and the

    *          integer expression errno is set to an implementation-defined

    *          nonzero value (under RISCOS/Arthur/Brazil the value that of EDOM

    *          in math.h).

    */

extern long int ftell(FILE * /*stream*/);

   /*

    * obtains the current value of the file position indicator for the stream

    * pointed to by stream. For a binary stream, the value is the number of

    * characters from the beginning of the file. For a text stream, the file

    * position indicator contains unspecified information, usable by the fseek

    * function for returning the file position indicator to its position at the

    * time of the ftell call; the difference between two such return values is

    * not necessarily a meaningful measure of the number of characters written

    * or read.

    * Returns: if successful, the current value of the file position indicator.

    *          On failure, the ftell function returns -1L and sets the integer

    *          expression errno to an implementation-defined nonzero value

    *          (under RISCOS/Arthur/Brazil ftell cannot fail).

    */

extern void rewind(FILE * /*stream*/);

   /*

    * sets the file position indicator for the stream pointed to by stream to

    * the beginning of the file. It is equivalent to

    *          (void)fseek(stream, 0L, SEEK_SET)

    * except that the error indicator for the stream is also cleared.

    * Returns: no value.

    */

extern void clearerr(FILE * /*stream*/);

   /*

    * clears the end-of-file and error indicators for the stream pointed to by

    * stream. These indicators are cleared only when the file is opened or by

    * an explicit call to the clearerr function or to the rewind function.

    * Returns: no value.

    */

extern int feof(FILE * /*stream*/);

   /*

    * tests the end-of-file indicator for the stream pointed to by stream.

    * Returns: nonzero iff the end-of-file indicator is set for stream.

    */

extern int ferror(FILE * /*stream*/);

   /*

    * tests the error indicator for the stream pointed to by stream.

    * Returns: nonzero iff the error indicator is set for stream.

    */

extern void perror(const char * /*s*/);

   /*

    * maps the error number  in the integer expression errno to an error

    * message. It writes a sequence of characters to the standard error stream

    * thus: first (if s is not a null pointer and the character pointed to by

    * s is not the null character), the string pointed to by s followed by a

    * colon and a space; then an appropriate error message string followed by

    * a new-line character. The contents of the error message strings are the

    * same as those returned by the strerror function with argument errno,

    * which are implementation-defined.

    * Returns: no value.

    */

#ifdef __cplusplus

}

#endif

#endif

/* end of stdio.h */