🚀 go-pugleaf

In article <54014@microsoft.UUCP> alistair@microsoft.UUCP (Alistair BANKS) writes:
|| 2. The API seems to only allow you to pull out a list of specified
|| attributes; is there a way of retrieving the whole list, without
|| specifying the names in advance?  If not, how would you duplicate a
|| file, preserving its attributes, without knowing in advance what
|| attributes it had?
|
|The EA retrieval APIs are specified by name (DosQPathInfo, DosFindFirst2),
|but you can get the names of EAs attached to a file using:
|
|USHORT DosEnumAttribute(usRefType, pvFile, ulEntry, pvBuf, cbBuf, pulCount,
|    ulInfoLevel, ulReserved);
|
|The DosEnumAttribute function enumerates extended attributes for a specified
|file or subdirectory.

Once you read the spec for DosEnumAttribute,n you may be wondering why
you have to call DosEnumAttribute, instead of a call that returns all
extended attributes.  The reason for this is that a file could have more
than 64k worth of extended attribute information, which would not fit
into a segment.  Therefore, it may not be possible to return all
attributes in one system call. Alot of people miss that, and claim that
EnumAttribute it is a poor way of getting to the EA's, when in fact it
is a good way of insuring you get everything.