Method: OCI8::LOB#seek

Defined in:
ext/oci8/lob.c

#seek(amount, whence = IO::SEEK_SET) ⇒ self

Seeks to the given offset in the stream. The new position, measured in characters, is obtained by adding offset amount to the position specified by whence. If whence is set to IO::SEEK_SET, IO::SEEK_CUR, or IO::SEEK_END, the offset is relative to the start of the file, the current position indicator, or end-of-file, respectively.

Parameters:

  • amount (Integer)
  • whence (IO::SEEK_SET, IO::SEEK_CUR or IO::SEEK_END)

Returns:

  • (self) 


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# File 'ext/oci8/lob.c', line 519

static VALUE oci8_lob_seek(int argc, VALUE *argv, VALUE self)
{
    oci8_lob_t *lob = TO_LOB(self);
    VALUE position, whence;

    rb_scan_args(argc, argv, "11", &position, &whence);
    if (argc == 2 && (whence != seek_set && whence != seek_cur && whence != seek_end)) {
        if (FIXNUM_P(whence)) {
            rb_raise(rb_eArgError, "expect IO::SEEK_SET, IO::SEEK_CUR or IO::SEEK_END but %d",
                     FIX2INT(whence));
        } else {
            rb_raise(rb_eArgError, "expect IO::SEEK_SET, IO::SEEK_CUR or IO::SEEK_END but %s",
                     rb_class2name(CLASS_OF(whence)));
        }
    }
    if (whence == seek_cur) {
        position = rb_funcall(ULL2NUM(lob->pos), id_plus, 1, position);
    } else if (whence == seek_end) {
        position = rb_funcall(ULL2NUM(oci8_lob_get_length(lob)), id_plus, 1, position);
    }
    lob->pos = NUM2ULL(position);
    return self;
}