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/*

FUNCTION

<<fsetpos>>---restore position of a stream or file

INDEX

        fsetpos

ANSI_SYNOPSIS

        #include <stdio.h>

        int fsetpos(FILE *<[fp]>, const fpos_t *<[pos]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        int fsetpos(<[fp]>, <[pos]>)

        FILE *<[fp]>;

        fpos_t *<[pos]>;

DESCRIPTION

Objects of type <<FILE>> can have a ``position'' that records how much

of the file your program has already read.  Many of the <<stdio>> functions

depend on this position, and many change it as a side effect.

You can use <<fsetpos>> to return the file identified by <[fp]> to a previous

position <<*<[pos]>>> (after first recording it with <<fgetpos>>).

See <<fseek>> for a similar facility.

RETURNS

<<fgetpos>> returns <<0>> when successful.  If <<fgetpos>> fails, the

result is <<1>>.  The reason for failure is indicated in <<errno>>:

either <<ESPIPE>> (the stream identified by <[fp]> doesn't support

repositioning) or <<EINVAL>> (invalid file position).

PORTABILITY

ANSI C requires <<fsetpos>>, but does not specify the nature of

<<*<[pos]>>> beyond identifying it as written by <<fgetpos>>.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <stdio.h>

int

_DEFUN (fsetpos, (iop, pos),

        FILE * iop _AND

        _CONST fpos_t * pos)

{

  int x = fseek (iop, *pos, SEEK_SET);

  if (x != 0)

    return 1;

  return 0;

}