Add minimal support for "o"-type print-file actions in lpd control files.

This was described in the original RFC wrt lpr, but most lpr's do not
actually implement it.  There is some indication that MacOS 10.1 will
be using this when sending postscript files to print servers (that is
what "o"-type was supposed to signify -- postscript files).

MFC after:	1 week

1 files changed, 18 insertions, 12 deletions

diff --git a/usr.sbin/lpr/common_source/ctlinfo.c b/usr.sbin/lpr/common_source/ctlinfo.c
index 5665154..6d08025 100644
--- a/usr.sbin/lpr/common_source/ctlinfo.c
+++ b/usr.sbin/lpr/common_source/ctlinfo.c
@@ -183,20 +183,26 @@ __END_DECLS
  *
  *	The following indicate actions to take on a given datafile.  The same
  *	datafile may appear on more than one "print this file" command in the
- *	control file.  Note that ALL ids with lowercase letters are commands
- *	to "print this file":
+ *	control file.  Note that ALL ids with lowercase letters are expected
+ *	to be actions to "print this file":
  *
- *	  f   - "file name", a plain-text file to print
- *	  l   - "file name", text file with control chars to print (some
- *		printers recognize this id as a request to print a
- *		postscript file)
- *	  p   - "file name", text file to print with pr(1)
- *	  t   - "file name", troff(1) file to print
- *	  n   - "file name", ditroff(1) file to print
- *	  d   - "file name", dvi file to print
- *	  g   - "file name", plot(1G) file to print
+ *	  c   - "file name", cifplot file to print.  This action appears
+ *		when the user has requested 'lpr -c'.
+ *	  d   - "file name", dvi file to print, user requested 'lpr -d'
+ *	  f   - "file name", a plain-text file to print = "standard"
+ *	  g   - "file name", plot(1G) file to print, ie 'lpr -g'
+ *	  l   - "file name", text file with control chars which should
+ *		be printed literally, ie 'lpr -l'  (note: some printers
+ *		take this id as a request to print a postscript file)
+ *	  n   - "file name", ditroff(1) file to print, ie 'lpr -n'
+ *	  o   - "file name", a postscript file to print.  This id is
+ *		described in the original RFC, but not much has been
+ *		done with it.  This 'lpr' does not generate control
+ *		lines with 'o'-actions, but lpd's printjob processing
+ *		will treat it the same as 'f'.
+ *	  p   - "file name", text file to print with pr(1), ie 'lpr -p'
+ *	  t   - "file name", troff(1) file to print, ie 'lpr -t'
  *	  v   - "file name", plain raster file to print
- *	  c   - "file name", cifplot file to print
  *
  *	  U   - "file name" of datafile to unlink (ie, remove file
  *		from spool directory.  To be done in a 'Pass 2',