Seek(). Seek() is particularly challenging because the value it
returns might be a valid file position and not an error.
- Replaced numeric function return codes of 0 and -1 with macros OK,
SEEK_ERROR/ERROR to clarify the respective purposes.
- Changed how ftell() and fseek() are used, double-checking the return
value and the errno code.
git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14923 87f5fb63-7c3d-0410-a384-fd976d0f7a62