gzseek(3) [php man page]

GZSEEK(3)								 1								 GZSEEK(3)

gzseek - Seek on a gz-file pointer

SYNOPSIS

       int gzseek (resource  $zp, int  $offset, [int  $whence = SEEK_SET])

DESCRIPTION

	Sets  the  file  position indicator for the given file pointer to the given offset byte into the file stream. Equivalent to calling (in C)
       gzseek(zp, offset, SEEK_SET).

	If the file is opened for reading, this function is emulated but can be extremely slow. If the file is opened for  writing,  only  forward
       seeks are supported; gzseek(3) then compresses a sequence of zeroes up to the new starting position.

PARAMETERS

	      o $zp
		- The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen(3).

	      o $offset
		- The seeked offset.

	      o $whence
		-$whence values are:

		     o SEEK_SET - Set position equal to $offset bytes.

		     o SEEK_CUR - Set position to current location plus $offset.

	       If $whence is not specified, it is assumed to be SEEK_SET.

RETURN VALUES

	Upon success, returns 0; otherwise, returns -1. Note that seeking past EOF is not considered an error.

EXAMPLES

       Example #1

	      gzseek(3) example

	      <?php
	      $gz = gzopen('somefile.gz', 'r');
	      gzseek($gz,2);
	      echo gzgetc($gz);
	      gzclose($gz);
	      ?>

SEE ALSO

       gztell(3), gzrewind(3).

PHP Documentation Group 														 GZSEEK(3)

FSEEK(3)						     Linux Programmer's Manual							  FSEEK(3)

NAME

       fgetpos, fseek, fsetpos, ftell, rewind - reposition a stream

SYNOPSIS

       #include <stdio.h>

       int fseek(FILE *stream, long offset, int whence);
       long ftell(FILE *stream);
       void rewind(FILE *stream);
       int fgetpos(FILE *stream, fpos_t *pos);
       int fsetpos(FILE *stream, fpos_t *pos);

DESCRIPTION

       The  fseek function sets the file position indicator for the stream pointed to by stream.  The new position, measured in bytes, is obtained
       by adding offset bytes to the position specified by whence.  If 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) function on the same stream.

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

       The rewind function 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 (see clearerr(3)).

       The fgetpos and fsetpos functions are alternate interfaces equivalent to ftell and fseek (with whence set to SEEK_SET), setting and storing
       the current value of the file offset into or from the object referenced by pos.	On some non-UNIX systems an fpos_t object may be a complex
       object and these routines may be the only way to portably reposition a text stream.

RETURN VALUE

       The  rewind function returns no value.  Upon successful completion, fgetpos, fseek, fsetpos return 0, and ftell returns the current offset.
       Otherwise, -1 is returned and the global variable errno is set to indicate the error.

ERRORS

       EBADF  The stream specified is not a seekable stream.

       EINVAL The whence argument to fseek was not SEEK_SET, SEEK_END, or SEEK_CUR.

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

CONFORMING TO

       The fgetpos, fsetpos, fseek, ftell, and rewind functions conform to ANSI X3.159-1989 (``ANSI C'').

SEE ALSO

       lseek(2), fseeko(3)

BSD MANPAGE
							    1993-11-29								  FSEEK(3)