Get the size of a file

Hi,
There's no way to get the size of a file ?!? (I mean it doesn't come
natively with GT.M when you do:
~ s file="/usr/sebariga/textFile.txt"
~ s fileSize=someProc^fileUtilities(file)
??)

Will I have to write some routine that will (in order to get want I
wrote above):
- set up a counter at 0
- then loop thru a file and increment this counter by 1
- return this counter once I've exited the loop ?

Thanks.
Seb