Create more DS2 Predefined Packages - start with FileIO and DataIO

[RichardDeVen]

Create predefined packages whose methods are the same as SAS Functions and CALL Routines by Category 

The methods suggested here are not currently implemented as DS2 functions, so it would make sense to add them in a package wise fashion.

Package ExternalFiles - suggested methods

External Files	DCLOSE Function	Closes a directory that was opened by the DOPEN function.
	DCREATE Function	Returns the complete pathname of a new, external directory.
	DINFO Function	Returns information about a directory.
	DNUM Function	Returns the number of members in a directory.
	DOPEN Function	Opens a directory, and returns a directory identifier value.
	DOPTNAME Function	Returns directory attribute information.
	DOPTNUM Function	Returns the number of information items that are available for a directory.
	DREAD Function	Returns the name of a directory member.
	DROPNOTE Function	Deletes a note marker from a SAS data set or an external file.
	DSNCATLGD Function	Verifies the existence of an external file in the z/OS system catalog by its physical name.
	FAPPEND Function	Appends the current record to the end of an external file.
	FCLOSE Function	Closes an external file, directory, or directory member.
	FCOL Function	Returns the current column position in the File Data Buffer (FDB).
	FDELETE Function	Deletes an external file or an empty directory.
	FEXIST Function	Verifies the existence of an external file that is associated with a fileref.
	FGET Function	Copies data from the File Data Buffer (FDB) into a variable.
	FILEEXIST Function	Verifies the existence of an external file by its physical name.
	FILENAME Function	Assigns or deassigns a fileref to an external file, directory, or output device.
	FILEREF Function	Verifies whether a fileref has been assigned for the current SAS session.
	FINFO Function	Returns the value of a file information item.
	FNOTE Function	Identifies the last record that was read, and returns a value that the FPOINT function can use.
	FOPEN Function	Opens an external file and returns a file identifier value.
	FOPTNAME Function	Returns the name of an item of information about an external file.
	FOPTNUM Function	Returns the number of information items, such as filename or record length, that are available for an external file.
	FPOINT Function	Positions the read pointer on the next record to be read.
	FPOS Function	Sets the position of the column pointer in the File Data Buffer (FDB).
	FPUT Function	Moves data to the File Data Buffer (FDB) of an external file, starting at the FDB's current column position.
	FREAD Function	Reads a record from an external file into the File Data Buffer (FDB).
	FREWIND Function	Positions the file pointer to the start of the file.
	FRLEN Function	Returns the size of the last record that was read, or, if the file is opened for output, returns the current record size.
	FSEP Function	Sets the token delimiters for the FGET function.
	FWRITE Function	Writes a record to an external file.
	MOPEN Function	Opens a file by directory ID and member name, and returns either the file identifier or a 0.
	PATHNAME Function	Returns the physical name of an external file or a SAS library, or returns a blank.
	RENAME Function	Renames a member of a SAS library, an entry in a SAS catalog, an external file, or a directory.
	SYSMSG Function	Returns error or warning message text from processing the last data set or external file function.
	SYSRC Function	Returns a system error number.

Package SASFileIO - suggested methods

SAS File I/O	ATTRC Function	Returns the value of a character attribute for a SAS data set.
	ATTRN Function	Returns the value of a numeric attribute for a SAS data set.
	CEXIST Function	Verifies the existence of a SAS catalog or SAS catalog entry.
	CLOSE Function	Closes a SAS data set.
	CUROBS Function	Returns the observation number of the current observation.
	DROPNOTE Function	Deletes a note marker from a SAS data set or an external file.
	DSNAME Function	Returns the SAS data set name that is associated with a data set identifier.
	ENVLEN Function	Returns the length of an environment variable.
	EXIST Function	Verifies the existence of a SAS library member.
	FCOPY Function	Copies records from one fileref to another fileref, and returns a value that indicates whether the records were successfully copied.
	FETCH Function	Reads the next non-deleted observation from a SAS data set into the Data Set Data Vector (DDV).
	FETCHOBS Function	Reads a specified observation from a SAS data set into the Data Set Data Vector (DDV).
	GETVARC Function	Returns the value of a SAS data set character variable.
	GETVARN Function	Returns the value of a SAS data set numeric variable.
	IORCMSG Function	Returns a formatted error message for _IORC_.
	LIBNAME Function	Assigns or clears a libref for a SAS library.
	LIBREF Function	Verifies that a libref has been assigned.
	NOTE Function	Returns an observation ID for the current observation of a SAS data set.
	OPEN Function	Opens a SAS data set.
	PATHNAME Function	Returns the physical name of an external file or a SAS library, or returns a blank.
	POINT Function	Locates an observation that is identified by the NOTE function.
	RENAME Function	Renames a member of a SAS library, an entry in a SAS catalog, an external file, or a directory.
	REWIND Function	Positions the data set pointer at the beginning of a SAS data set.
	SYSEXIST Function	Returns a value that indicates whether an operating-environment variable exists in your environment.
	SYSMSG Function	Returns error or warning message text from processing the last data set or external file function.
	SYSRC Function	Returns a system error number.
	VARFMT Function	Returns the format that is assigned to a SAS data set variable.
	VARINFMT Function	Returns the informat that is assigned to a SAS data set variable.
	VARLABEL Function	Returns the label that is assigned to a SAS data set variable.
	VARLEN Function	Returns the length of a SAS data set variable.
	VARNAME Function	Returns the name of a SAS data set variable.
	VARNUM Function	Returns the number of a variable's position in a SAS data set.
	VARTYPE Function	Returns the data type of a SAS data set variable.

Roadmap

The same argument can be made for other functions (in other categories) that are not yet in the DS2 function space.  Add those functions in category like named packages.