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Интерактивная система просмотра системных руководств (man-ов)

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fseeko (3)
  • >> fseeko (3) ( FreeBSD man: Библиотечные вызовы )
  • fseeko (3) ( Русские man: Библиотечные вызовы )
  • fseeko (3) ( Linux man: Библиотечные вызовы )
  • fseeko (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    fgetpos
    
     
    fseek
    
     
    fseeko
    
     
    fsetpos
    
     
    ftell
    
     
    ftello
    
     
    rewind
    
     - reposition a stream
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <stdio.h>
    int fseek (FILE *stream long offset int whence);
    long ftell (FILE *stream);
    void rewind (FILE *stream);
    int fgetpos (FILE * restrict stream fpos_t * restrict pos);
    int fsetpos (FILE *stream const fpos_t *pos);
       #include <sys/types.h>
    int fseeko (FILE *stream off_t offset int whence);
    off_t ftello (FILE *stream);
     

    DESCRIPTION

    The fseek ();
    function sets the file position indicator for the stream pointed to by Fa stream . The new position, measured in bytes, is obtained by adding Fa offset bytes to the position specified by Fa whence . If Fa whence is set to SEEK_SET SEEK_CUR or SEEK_END the offset is relative to the start of the file, the current position indicator, or end-of-file, respectively. A successful call to the fseek ();
    function clears the end-of-file indicator for the stream and undoes any effects of the ungetc(3) and ungetwc(3) functions on the same stream.

    The ftell ();
    function obtains the current value of the file position indicator for the stream pointed to by Fa stream .

    The rewind ();
    function sets the file position indicator for the stream pointed to by Fa 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 (see clearerr(3)).

    Since rewind ();
    does not return a value, an application wishing to detect errors should clear errno then call rewind (,);
    and if errno is non-zero, assume an error has occurred.

    The fseeko ();
    function is identical to fseek (,);
    except it takes an Fa off_t argument instead of a Fa long . Likewise, the ftello ();
    function is identical to ftell (,);
    except it returns an Fa off_t .

    The fgetpos ();
    and fsetpos ();
    functions are alternate interfaces for retrieving and setting the current position in the file, similar to ftell ();
    and fseek (,);
    except that the current position is stored in an opaque object of type Vt fpos_t pointed to by Fa pos . These functions provide a portable way to seek to offsets larger than those that can be represented by a Vt long int . They may also store additional state information in the Vt fpos_t object to facilitate seeking within files containing multibyte characters with state-dependent encodings. Although Vt fpos_t has traditionally been an integral type, applications cannot assume that it is; in particular, they must not perform arithmetic on objects of this type.

    If the stream is a wide character stream (see fwide(3)), the position specified by the combination of Fa offset and Fa whence must contain the first byte of a multibyte sequence.  

    RETURN VALUES

    The rewind ();
    function returns no value.

    Rv -std fgetpos fseek fseeko fsetpos

    Upon successful completion, ftell ();
    and ftello ();
    return the current offset. Otherwise, -1 is returned and the global variable errno is set to indicate the error.  

    ERRORS

    Bq Er EBADF
    The Fa stream argument is not a seekable stream.
    Bq Er EINVAL
    The Fa whence argument is invalid or the resulting file-position indicator would be set to a negative value.
    Bq Er EOVERFLOW
    The resulting file offset would be a value which cannot be represented correctly in an object of type Fa off_t for fseeko ();
    and ftello ();
    or Fa long for fseek ();
    and ftell (.);
    Bq Er ESPIPE
    The file descriptor underlying stream is associated with a pipe or FIFO or file-position indicator value is unspecified (see ungetc(3)).

    The functions fgetpos (,);
    fseek (,);
    fseeko (,);
    fsetpos (,);
    ftell (,);
    ftello (,);
    and rewind ();
    may also fail and set errno for any of the errors specified for the routines fflush(3), fstat(2), lseek(2), and malloc(3).  

    SEE ALSO

    lseek(2), clearerr(3), fwide(3), ungetc(3), ungetwc(3)  

    STANDARDS

    The fgetpos (,);
    fsetpos (,);
    fseek (,);
    ftell (,);
    and rewind ();
    functions conform to St -isoC .

    The fseeko ();
    and ftello ();
    functions conform to St -p1003.1-2001 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    STANDARDS


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