method

seek

v1_8_7_330 - Show latest stable - 0 notes - Class: StringIO

seek(...) public

Seeks to a given offset amount in the stream according to the value of whence (see IO#seek).

/*
 * call-seq:
 *   strio.seek(amount, whence=SEEK_SET) -> 0
 *
 * Seeks to a given offset _amount_ in the stream according to
 * the value of _whence_ (see IO#seek).
 */
static VALUE
strio_seek(argc, argv, self)
    int argc;
    VALUE *argv;
    VALUE self;
{
    VALUE whence;
    struct StringIO *ptr = StringIO(self);
    long offset;

    rb_scan_args(argc, argv, "11", NULL, &whence);
    offset = NUM2LONG(argv[0]);
    if (CLOSED(ptr)) {
        rb_raise(rb_eIOError, "closed stream");
    }
    switch (NIL_P(whence) ? 0 : NUM2LONG(whence)) {
      case 0:
        break;
      case 1:
        offset += ptr->pos;
        break;
      case 2:
        offset += RSTRING(ptr->string)->len;
        break;
      default:
        error_inval("invalid whence");
    }
    if (offset < 0) {
        error_inval(0);
    }
    ptr->pos = offset;
    ptr->flags &= ~STRIO_EOF;
    return INT2FIX(0);
}

seek

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