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SUBROUTINE HLPTX2 (FILTTI,FILTTO,FILNFO,CMDSTR,LENCMD)
C$ (Help - Read Info)
C$ This program displays portions of a .NFO (iNFO) file
C$ created by the MKINFO utility from a .ULP (User heLP) file.
C$ This provides a convenient and powerful help file access
C$ capability to a FORTRAN calling program. On entry, files
C$ FILTTI and FILTTO must be open.
C$
C$ FILTTI.........Terminal sequential input file.
C$ FILTTO.........Terminal sequential output file.
C$ FILNFO.........Unit number for INFO file. On the first
C$ entry, it should be closed. On return, it
C$ may be open for use on subsequent calls.
C$ CMDSTR.........A1-format Hollerith string which is either
C$ all blank, or contains one of the following
C$ forms which can be appended to a RDINFO G
C$ (GO TO) command:
C$
C$ topicname
C$ (filename)
C$ (filename)topicname
C$
C$ On the first entry, a blank string implies
C$ "(DIR)Top", the directory file menu node; on
C$ subsequent entries, it continues in the node
C$ last visited. If FILNFO is not open on
C$ subsequent entries (which can happen only if
C$ the caller closes it), and this fact can be
C$ detected (which is possible if a FORTRAN 77
C$ INQUIRE statement is available), the
C$ directory file will be visited
C$ LENCMD.........Number of characters in CMDSTR(*).
C$
C$ On return, FILNFO will be open, but not necessarily for the
C$ same file as at entry, since it is possible for the user to
C$ visit other files in the INFO system.
C$ (21-Feb-1991)