rewind()
public
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/*
* call-seq:
* ios.rewind => 0
*
* Positions <em>ios</em> to the beginning of input, resetting
* <code>lineno</code> to zero.
*
* f = File.new("testfile")
* f.readline #=> "This is line one\n"
* f.rewind #=> 0
* f.lineno #=> 0
* f.readline #=> "This is line one\n"
*/
static VALUE
rb_io_rewind(io)
VALUE io;
{
rb_io_t *fptr;
GetOpenFile(io, fptr);
if (io_seek(fptr, 0L, 0) != 0) rb_sys_fail(fptr->path);
clearerr(fptr->f);
if (io == current_file) {
gets_lineno -= fptr->lineno;
}
fptr->lineno = 0;
return INT2FIX(0);
}