 @@ -1,247 +1,247 @@
-.\"	$NetBSD: fseek.3,v 1.28 2017/01/01 12:39:33 abhinav Exp $
+.\"	$NetBSD: fseek.3,v 1.29 2021/09/11 18:46:22 rillig Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\"
 .\" This code is derived from software contributed to Berkeley by
 .\" Chris Torek and the American National Standards Committee X3,
 .\" on Information Processing Systems.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
 .\" 1. Redistributions of source code must retain the above copyright
 .\"    notice, this list of conditions and the following disclaimer.
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
 .\" 3. Neither the name of the University nor the names of its contributors
 .\"    may be used to endorse or promote products derived from this software
 .\"    without specific prior written permission.
 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)fseek.3	8.1 (Berkeley) 6/4/93
 .\"
-.Dd January 1, 2017
+.Dd September 11, 2021
 .Dt FSEEK 3
 .Os
 .Sh NAME
 .Nm fgetpos ,
 .Nm fseek ,
 .Nm fseeko ,
 .Nm fsetpos ,
 .Nm ftell ,
 .Nm ftello ,
 .Nm rewind
 .Nd reposition a stream
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In stdio.h
 .Ft int
 .Fn fseek "FILE *stream" "long int offset" "int whence"
 .Ft int
 .Fn fseeko "FILE *stream" "off_t offset" "int whence"
 .Ft long int
 .Fn ftell "FILE *stream"
 .Ft off_t
 .Fn ftello "FILE *stream"
 .Ft void
 .Fn rewind "FILE *stream"
 .Ft int
 .Fn fgetpos "FILE * restrict stream" "fpos_t * restrict pos"
 .Ft int
 .Fn fsetpos "FILE * restrict stream" "const fpos_t * restrict pos"
 .Sh DESCRIPTION
 The
 .Fn 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
 .Dv SEEK_SET ,
 .Dv SEEK_CUR ,
 or
 .Dv 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
 .Fn fseek
 function clears the end-of-file indicator for the stream and undoes
 any effects of the
 .Xr ungetc 3
 function on the same stream.
 .Pp
 The
 .Fn fseeko
 function is identical to the
 .Fn fseek
 function except that the
 .Fa offset
 argument is of type
 .Fa off_t .
 .Pp
 The
 .Fn ftell
 function
 obtains the current value of the file position indicator for the
 stream pointed to by
 .Fa stream .
 .Pp
 The
 .Fn ftello
 function is identical to the
 .Fn ftell
 function except that the return value is of type
 .Fa off_t .
 .Pp
 The
 .Fn 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:
 .Pp
 .Dl (void)fseek(stream, 0L, SEEK_SET)
 .Pp
 except that the error indicator for the stream is also cleared
 (see
 .Xr clearerr 3 ) .
 .Pp
 In this implementations,
 .Dq Fa fpos_t
 is a complex object that represents both the position and the parse
-state of the stream, making these routines as the only way to portably
+state of the stream, making these routines the only way to portably
 reposition a text stream.
 The
 .Ar pos
 argument of
 .Fn fsetpos
 must always be initialized by
 a call to
 .Fn fgetpos .
 .Sh RETURN VALUES
 The
 .Fn rewind
 function
 returns no value.
 .Pp
 Upon successful completion,
 .Fn fgetpos ,
 .Fn fseek ,
 .Fn fseeko ,
 and
 .Fn fsetpos
 return 0,
 whereas the functions
 .Fn ftell
 and
 .Fn ftello
 return the current offset.
 On failure,
 .Fn fseek ,
 .Fn fseeko ,
 .Fn ftell ,
 and
 .Fn ftello
 return \-1, while
 .Fn fgetpos
 and
 .Fn fsetpos
 return a nonzero value.
 .Pp
 On error all functions set the global variable
 .Va errno
 to indicate the error.
 Since the
 .Fn rewind
 function does not return an error code, applications need to clear
 .Va errno
 before calling it in order to detect errors.
 .Sh ERRORS
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
 .Fa stream
 specified
 is not a seekable stream.
 .It Bq Er EINVAL
 The
 .Fa whence
 argument to
 .Fn fseek
 was not
 .Dv SEEK_SET ,
 .Dv SEEK_END ,
 or
 .Dv SEEK_CUR .
 .It Bq Er EOVERFLOW
 For
 .Fn ftell ,
 the current file offset cannot be represented correctly in an object of type
 .Fa long .
 .El
 .Pp
 The function
 .Fn fgetpos ,
 .Fn fseek ,
 .Fn fseeko ,
 .Fn fsetpos ,
 .Fn ftell ,
 .Fn ftello ,
 and
 .Fn rewind
 may also fail and set
 .Va errno
 for any of the errors specified for the routines
 .Xr fflush 3 ,
 .Xr fstat 2 ,
 .Xr lseek 2 ,
 and
 .Xr malloc 3 .
 .Sh SEE ALSO
 .Xr lseek 2 ,
 .Xr clearerr 3 ,
 .Xr ungetc 3
 .Sh STANDARDS
 The
 .Fn fgetpos ,
 .Fn fsetpos ,
 .Fn fseek ,
 .Fn ftell ,
 and
 .Fn rewind
 functions
 conform to
 .St -ansiC .
 The
 .Fn fseeko
 and
 .Fn ftello
 functions conform to
 .St -xsh5 .
 .Sh BUGS
 The
 .Fn fgetpos
 and
 .Fn fsetpos
 functions don't store/set shift states of the stream in this implementation.