Repatch (from linux) of OSX IRAF

35 files changed, 3441 insertions, 0 deletions

diff --git a/sys/tty/README b/sys/tty/README
new file mode 100644
index 00000000..2ab27b7e
--- /dev/null
+++ b/sys/tty/README
@@ -0,0 +1,29 @@
+This directory contains the source for the TTY interface, a device independent
+interface used to control terminals.  We interface to the widely used
+TERMCAP terminal database, thereby gaining the data required to control many
+diverse terminals.  (Written Jan84 dct).
+
+Mar84	Added TTYGDES and the "graphcap" file, used to describe graphics
+	devices.
+
+Jly84	Added capability to compile selected termcap entries to speedup
+	TTYODES.  Added TTYCOMPILE, TTYLOAD, TTYOPEN, TTYCLOSE.  Modified
+	the existing routines TTYODES and TTYGDES.  The new open and close
+	routines are useful for any type of database maintained in termcap
+	format.
+
+Jly84	Entry point TTYCLINE changed to TTYCLEARLN to avoid name conflict
+	with TTYCLOSE.
+
+Jly84	Task MKTTYDATA is used to compile selected entries from TERMCAP
+	files.  The include files "cache_?.dat" are the output of this
+	program.  To tailor the cache of pre-compiled termcap device
+	entries for a site, compile MKTTYDATA and run it to generate
+	the files "cache_t.dat" for "dev$termcap" (default MKTTYDATA params)
+	and "cache_g.dat" for "dev$graphcap", then do a Sysgen to recompile
+	the libraries.  All programs which use the TTY interface, e.g.,
+	the SYSTEM package, must then be relinked to make use of the new
+	cache.
+
+Jun85	Changed filenames to make them more machine independent.
+	Installed MKTTYDATA as a task in the SOFTOOLS package.
diff --git a/sys/tty/doc/tty.hlp b/sys/tty/doc/tty.hlp
new file mode 100644
index 00000000..62924590
--- /dev/null
+++ b/sys/tty/doc/tty.hlp
@@ -0,0 +1,485 @@
+.help tty Dec83 "Terminal Control Interface"
+.nh
+Introduction
+
+    The TTY interface is a table driven, device independent interface for
+controlling terminal and printer devices.  Devices are described either by
+environment definitions, or by an entry in the TTY database file.  The TTY
+database file is the standard Berkeley UNIX termcap terminal capability
+database file (a text file), to which we have added entries for our printer
+devices.  Accessing the UNIX termcap file directly without modification
+is sometimes awkward, but the benefits of accessing a widely used, standard
+database more than compensate for any clumsiness.
+
+When the CL starts up, the following environment variables are defined to
+describe the default terminal and printer devices.  The user may subsequently
+change the values of these variables with the SET statement or with the STTY
+program.
+
+
+.ks
+.nf
+	printer		default printer (i.e., "versatec")
+	terminal	default terminal (i.e., "vt100", "tek4012")
+	termcap		terminal/printer database filename
+	ttybaud		baud rate, default 9600
+	ttyncols	number of characters per line
+	ttynlines	number of lines per screen
+.fi
+.ke
+
+
+The variables defining the names of the default terminal and printer
+devices will normally correspond to the names of device entries in the
+termcap file.  The name of a file containing a single termcap entry
+for the device may optionally be given; the file name must contain a
+VFN or OSFN directory prefix to be recognized as a filename.  The default
+termcap file is dev$termcap.  Terminal initialization files (used to
+set tabstops) are files of the form dev$tty.tbi, where "tty" is the last
+field of the UNIX pathname in the "if" termcap entry.  If the first
+character of the "if" filename string is not a /, an IRAF VFN should
+be given.
+
+The value strings for the environment variables TTYNCOLS and TTYNLINES,
+defining the screen dimensions, are extracted from the termcap file by the
+STTY program during startup.  The screen dimensions are defined in the
+environment for two reasons: (1) efficiency (the TTY package is not needed
+to learn the screen dimensions), and (2) if a window is used, the logical
+screen dimensions may be less than the physical screen dimensions.
+Most applications programs should therefore use ENVGETI rather than TTYGETI
+to get the screen dimensions.  TTYGETI returns the physical screen dimensions
+as given in the termcap file.
+
+.nh
+Library Procedures
+
+    Before any TTY control sequences can be output, the TTY device descriptor
+must be read from the termcap file into a buffer for efficient access.
+TYODES is used to "open" the TTY descriptor; TTYCDES should be called when
+done to close the descriptor, returning all buffer space used.  If "ttyname"
+is "terminal" or "printer", the descriptor for the default terminal or printer
+is accessed.
+
+
+.ks
+.nf
+Open/Close descriptor:
+
+	tty =	ttyodes (ttyname)		# pointer ttyodes()
+		ttycdes (tty)
+.fi
+.ke
+
+
+.ks
+.nf
+Low level database access, tty control:
+
+	  int = ttygeti (tty, cap)
+	 real = ttygetr (tty, cap)
+	 bool = ttygetb (tty, cap)
+       nchars = ttygets (tty, cap, outstr, maxch)
+		ttyputs (fd, tty, ctrlstr, afflncnt)
+		ttysubi (ctrlstr, outstr, maxch, arg1, arg2)
+.fi
+.ke
+
+
+.ks
+.nf
+High level control
+
+       OK|ERR = ttyctrl (fd, tty, cap, afflncnt)
+
+		  ttyso (fd, tty, YES|NO)	# turn standout mode on|off
+		ttygoto (fd, tty, col, line)	# move cursor absolute
+NI		ttyhorz (fd, tty, from, to)	# move cursor on line
+NI		ttyvert (fd, tty, from, to)	# move cursor on column
+		ttyinit (fd, tty)		# send :is & :if, if defined
+	       ttyclear (fd, tty)		# clear screen
+	     ttyclearln (fd, tty)		# clear the current line
+	     ttyputline (fd, tty, textline, map_cc)	# put text line
+.fi
+.ke
+
+
+The TTYGET procedures are used to get capabilities from the database entry.
+If the named capability is not found, TTYGETI returns zero, TTYGETB returns
+false, and TTYGETS returns the null string.  TTYSUBI performs argument
+substitution on a control sequence containing at most two integer arguments
+(such as a cursor motion control sequence), generating an output sequence
+suitable for input to TTYPUTS.  TTYPUTS puts the control sequence to the
+output file, padding as required given the number of affected lines.
+The baud rate and pad character, used to generate padding, are evaluated at
+TTYODES time and are conveyed to TTYPUTS in the tty descriptor.
+
+TTYSO turns standout mode on or off.
+TTYCNTRL calls TTYGETS and TTYPUTS to process and output a control sequence
+(slightly less efficiently than if the control string is buffered by
+the user code).  TTYGOTO moves the cursor to the
+desired column and line.  TTYHORZ and TTYVERT move the cursor on a line
+or column, using knowledge of the terminal's capabilities to generate the
+most efficient sequence.
+
+TTYPUTLINE is like the FIO PUTLINE, except that it processes any form feeds,
+standout mode directives, and other control characters (including tabs)
+embedded in the text.  Lines longer than TTYNCOLS are broken into several
+output lines.  TTYPUTLINE is used by the help, page, type, and lprint utilities 
+to map tabs and standout mode directives for a particular output device.
+Standout mode is mapped as reverse video on most VDT's, and as underscore
+on most printers and on overstrike terminals such as the tek4012.
+
+.nh
+Implementation Notes
+
+    Of the low level routines, only TTYODES and TTYSUBI are at all complex.
+The high level routines can be fairly complex due to the logic required to
+perform a function on devices which may vary greatly in capabilities.
+
+.nh 2
+Structure
+
+.ks
+.nf
+open descriptor:
+
+	ttyodes
+	    envget[si]
+	    calloc			[alloc tty descriptor]
+	    open,close,seek		[read termcap file]
+	    tty_fetch_entry		[fetch entry from file]
+		getline,getc
+		realloc
+	    realloc
+	    tty_index_caplist		[encode, sort caplist]
+	    ttygeti			[set padchar]
+.fi
+.ke
+
+
+.ks
+.nf
+close descriptor:
+
+	ttycdes
+	    ttyctrl			[sometimes needed]
+	    mfree			[free tty descriptor]
+.fi
+.ke
+
+
+.ks
+.nf
+get integer capability:
+
+	ttygeti
+	    tty_find_capability		[binary search of caplist]
+	    ctoi
+.fi
+.ke
+
+
+.ks
+.nf
+get string capability:
+
+	ttygets
+	    tty_find_capability		[binary search caplist]
+	    tty_map_escapes		[get control string]
+.fi
+.ke
+
+
+.ks
+.nf
+perform argument substitution on control string:
+
+	ttysubi
+	    gltoc
+.fi
+.ke
+
+
+.ks
+.nf
+output control string:
+	ttyputs
+	    putc
+.fi
+.ke
+
+.nh 2
+Data Structures
+
+    The tty descriptor contains several parameters describing the most basic
+features of the device, the raw termcap entry, an encoded index into the
+termcap entry used to speed up searches, and any status variables for the
+device.  Since a fixed length array is used to index capabilities, there is
+an upper limit on the number of capabilities, but there is no limit on the
+length of a termcap entry.
+
+
+.ks
+.nf
+	struct tty_descriptor {
+		int	t_len		# length of descriptor
+		int	t_op		# offset into caplist
+		int	t_padchar	# pad character
+		int	t_baud		# baud rate, bits/sec
+		int	t_nlines	# lines per screen
+		int	t_ncols		# chars per line
+		int	t_ncaps		# number of capabilities
+		int	t_capcode	# sorted, encoded caplist
+		int	t_capindex	# indices of cap strings
+		char	caplist[ARB]	# termcap entry
+	}
+.fi
+.ke
+
+
+TTYODES "opens" the tty descriptor, i.e., allocates a descriptor,
+scans the termcap file and reads the terminal entry into the descriptor,
+expanding any tc references, and then sets the baud and padchar fields.
+There is no limit on the size of a termcap entry, unlike the UNIX
+implementation which uses a fixed size, 1024 character caplist buffer.
+
+
+.tp 10
+.nf
+procedure ttyodes (ttyname)
+
+begin
+	# Get device name or file name.
+	if (ttyname equals "terminal")
+	    ttysource = fetch environment variable "terminal"
+	else if (ttyname equals "printer")
+	    ttysource = fetch environment variable "printer"
+	else
+	    ttysource = ttyname
+
+	# Get device name AND file name.
+	if (ttysource is a filename) {
+	    file = ttysource
+	    entry = "" (first entry)
+	} else {
+	    file = fetch termcap filename from environment
+	    entry = ttysource
+	}
+
+	allocate tty descriptor structure "tty"
+	tty.len = default length of descriptor
+	tty.op = pointer to first char of caplist string
+
+	# Fetch termcap entry into tty descriptor, expanding any "tc"
+	# references to other records by rescanning the file.
+
+	fd = open (termcap file)
+	repeat {
+	    tty_fetch_entry (fd, entry, tty)
+	    if (last field of entry is a "tc") {
+		entry = value of "tc" field
+		set tty.op to overwrite tc field
+		rewind (fd)
+	    } else
+		break
+	} 
+	close (fd)
+
+	# Get pad character and baud rate and store explicitly in the
+	# descriptor, since these values are used in every TTYPUTS call.
+
+	call realloc to return unused space in tty descriptor
+	call tty_index_caplist to index the caplist for efficient
+	    searches
+	tty.baud = fetch "baud" from environment
+	tty.padchar = ttygeti (tty, "pc")
+
+	return (tty)
+end
+.fi
+
+
+Scan the termcap file until the desired entry is found.  Copy the entry
+into the caplist field of the tty descriptor.  If the caplist buffer
+overflows, reallocate a larger buffer.
+
+.nf
+procedure tty_fetch_entry (fd, entry, tty)
+
+begin
+	# Locate entry.
+	repeat {
+	    advance to next record
+	    if (at eof)
+		error: termcap entry not found
+	} until (positioned to the entry we are looking for)
+
+	# Fetch entry.
+	while (getc (fd, ch) != EOF) {
+	    if (ch equals \ and next ch is newline) {
+		throw both out
+	    } else if (ch equals newline) {
+		deposit EOS
+		return
+	    } else
+		deposit ch
+
+	    bump output pointer
+	    if (buffer is full)
+		allocate more space
+	}
+
+	error: EOF encountered while reading termcap entry
+end
+.fi
+
+
+Prepare the caplist index.  Each two-character capability name maps into
+an unique integer code.  We prepare an list of capcodes and an associated
+list of indices into the caplist, then sort the capcode list.  At runtime
+we will perform a binary search of the capcode list to find the desired
+capcode.
+
+.nf
+procedure tty_index_caplist (caplist, capcode_list, capindex_list)
+
+begin
+	for (each entry in caplist) {
+	    compute capcode
+	    if (capcode is not already in capcode_list) {
+		bump list pointer
+		if (list overflows)
+		    error: too many capabilities in termcap entry
+
+		# Termcap flags capabilities that are not available 
+		# with the char '@'.
+		if (first char of entry is '@')
+		    index = 0
+		save capcode, index in lists
+	    }
+	}
+
+	if (two or more elements in list)
+	    sort list
+end
+.fi
+
+
+Process a capability string containing arguments.  Examples of such capability
+strings are cursor motion to [x,y], and set scrolling region to [l1,l2].
+Note that arguments in the termcap database are zero-indexed by default,
+while the TTYSUBI arguments are one-indexed.  The control string given as
+input has already been processed to reduce all escape sequences to single
+characters.
+
+.nf
+procedure ttysubi (ctrlstr, outstr, maxch, arg1, arg2)
+
+ctrlstr:	device control string
+outstr:		receives processed string
+arg1,arg2:	on input, the arguments to be expanded in the control
+		    string.  on output, the difference between the
+		    input arg values and the values actually used
+		    to produce outstr; these may differ if necessary
+		    to avoid special control chars in outstr.
+
+begin
+	# Make a local copy of the arguments to make reversal easy.  Also
+	# switch to zero-indexing internally, since the termcap entry is
+	# zero-indexed.
+
+	arg[1] = arg1 - 1
+	arg1 = 0
+	arg[2] = arg2 - 1
+	arg2 = 0
+	argnum = 1
+
+	op = 1
+	for (ip=1;  ctrlstr[ip] != EOS;  ip=ip+1) {
+	    ch = ctrlstr[ip]
+	    if (ch != '%') {
+		put char in outstr, bump op
+		next
+	    }
+
+	    switch (ch)
+	    case 'd', '2', '3', '+':
+		format coord and concat to outstr
+		increment argnum
+
+	    case '.':
+		# Binary output format.  Coordinate output in binary is a
+		# problem because the OS driver may see a tab, newline, or
+		# whatever and map it into something else.  If the value of
+		# arg[argnum] corresponds to a special control character,
+		# we increment it until we have an acceptable value, leaving
+		# it up to our caller to do the rest.
+
+		while (arg[argnum] is a special control character) {
+		    increment arg[argnum]
+		    increment arg1 or arg2
+		}
+		put binary value of arg[argnum] to outstr
+		increment argnum
+
+	    case '>':
+		conditionally modify arg[argnum]
+	    case 'r':
+		swap arg[1] and arg[2]
+	    case 'i':
+		increment arg[1] and arg[2]
+	    case '%':
+		put % to outstr, bump op
+	    case 'B':
+		BCD encode next arg
+	    case 'D':
+		backwards BCD encode next arg (ugh)
+	    }
+	}
+
+	deposit EOS
+end
+.fi
+
+
+The technique used for cursor addressing depends on the characteristics
+of the terminal.  If the terminal has no cursor motion capability, we
+try to position the cursor using primitive motion commands.  Otherwise
+we use TTYSUBI to generate the cursor motion sequence.  If TTYSUBI returns
+a residual, we use primitive motion commands (up line and backspace) to go
+the rest of the way in.
+
+
+.nf
+procedure ttygoto (fd, tty, col, line)
+
+begin
+	if (tty has no cursor addressing capability) {
+	    # If possible, the calling program should keep track of the
+	    # cursor position and use primitive motion commands for
+	    # positioning when possible.  We do the best we can without
+	    # knowledge of the current position.
+
+	    # First get to a known position.
+	    goto home or lower-left, depending on which is closest to
+		desired position and on capabilities of terminal.
+
+	    # Now move to the desired position.
+	    step to desired line using ttyvert
+	    advance to desired column using ttyhorz
+
+	} else {
+	    get cursor motion control string
+	    call ttysubi to substitute in desired coordinates
+	    call ttyputs to put control string to file
+
+	    # In certain cases, ttysubi cannot get us all the way there,
+	    # and we have to step in the rest of the way.
+
+	    if (line residual)
+		call ttyhorz to adjust position within line
+	    if (col residual)
+		call ttyvert to adjust vertical position
+	}
+end
+.fi
diff --git a/sys/tty/gttyload.x b/sys/tty/gttyload.x
new file mode 100644
index 00000000..066c1582
--- /dev/null
+++ b/sys/tty/gttyload.x
@@ -0,0 +1,38 @@
+# G_TTYLOAD -- Version of the TTYLOAD procedure for accessing compiled entries
+# from the GRAPHCAP database file.  Search the database of compiled GRAPHCAP
+# entries for the named device, and if found, return the CAPLIST string (list
+# of device capabilities) in the output string.  The number of characters output
+# is returned as the function value.  The compiled database is defined by the
+# include file "cacheg.dat", which serves as a cache for the GRAPHCAP
+# entries of heavily used devices (see TTYLOAD, TTYCOMPILE).
+
+int procedure g_ttyload (fname, device, outstr, maxch)
+
+char	fname[ARB]		# name of termcap file being referenced
+char	device[ARB]		# device name as in TERMCAP entry
+char	outstr[maxch]		# output string to receive caplist
+int	maxch
+
+int	dev
+bool	streq(), strne()
+int	gstrcpy()
+
+include	"dev$cacheg.dat"
+
+begin
+	# If the name of the file being referenced is not the same as the
+	# name of the file used to build the cache, then the cache is
+	# invalidated.
+
+	if (strne (fname, sbuf[termcap_filename]))
+	    return (0)
+
+	# NDEVICES, DEVNAME, DEVCAPS, and SBUF are defined and initialized
+	# in the include file.
+
+	do dev = 1, ndevices
+	    if (streq (sbuf[devname[dev]], device))
+		return (gstrcpy (sbuf[devcaps[dev]], outstr, maxch))
+
+	return (0)
+end
diff --git a/sys/tty/mkpkg b/sys/tty/mkpkg
new file mode 100644
index 00000000..35e97a8a
--- /dev/null
+++ b/sys/tty/mkpkg
@@ -0,0 +1,52 @@
+# Make the TTY interface portion of the LIBSYS library.
+
+$checkout libsys.a lib$
+$update   libsys.a
+$checkin  libsys.a lib$
+$exit
+
+update:
+	$call	relink
+	$call	install
+	;
+
+relink:
+	$omake	x_mkttydata.x <error.h> tty.h
+	$link	x_mkttydata.o
+	;
+
+install:
+	$move	x_mkttydata.e bin$
+	;
+
+libsys.a:
+	gttyload.x
+	ttycaps.x	tty.h
+	ttycdes.x	
+	ttyclear.x	tty.h <chars.h>
+	ttyclln.x	tty.h <chars.h>
+	ttyclose.x	
+	ttyctrl.x	tty.h <chars.h>
+	ttydelay.x	tty.h
+	ttydevnm.x	<ctype.h>
+	ttygdes.x	dev$cacheg.dat tty.h <chars.h> <ctype.h> <error.h>
+	ttygetb.x	
+	ttygeti.x	
+	ttygetr.x	<mach.h>
+	ttygets.x	<chars.h>
+	ttygoto.x	tty.h <chars.h>
+	ttygsize.x	<fset.h> <ttset.h> <ttyset.h>
+	ttyindex.x	tty.h <chars.h>
+	ttyinit.x	tty.h <chars.h> <error.h> <fset.h>
+	ttyload.x	dev$cachet.dat
+	ttyodes.x	tty.h <chars.h> <ctype.h> <error.h>
+	ttyopen.x	tty.h <chars.h> <ctype.h> <error.h>
+	ttyputl.x	tty.h <chars.h> <ctype.h>
+	ttyputs.x	
+	ttyread.x	<chars.h> <fset.h>
+	ttyseti.x	tty.h <chars.h> <ttyset.h>
+	ttyso.x	
+	ttystati.x	tty.h <chars.h> <ttyset.h>
+	ttysubi.x	tty.h <chars.h> <ctype.h>
+	ttywrite.x	tty.h <chars.h> <ctype.h>
+	;
diff --git a/sys/tty/tty.h b/sys/tty/tty.h
new file mode 100644
index 00000000..6e0e58e0
--- /dev/null
+++ b/sys/tty/tty.h
@@ -0,0 +1,51 @@
+# TTY package definitions.  Requires <chars.h>.
+
+define	TABSIZE		8
+define	MAX_TC_NESTING	5		# max nesting of tc=term references
+
+# Include here all special control characters (mapped by driver) which should
+# not be used as binary cursor coordinates.  The list must be terminated by
+# an EOS; do not count the EOS in NDCHARS.  Note that NUL cannot be included
+# in the list because it is the same as EOS.
+
+define	NDCHARS		3
+define	DRIVER_CHARS	EOT,HT,LF,EOS
+
+# Mapping function used to map capcodes ("cm", etc.) into unique integers.
+define	ENCODE		($1[1]*128+$1[2])
+
+# Types of standout modes defined for terminals.
+
+define	SOSE		1		# use so,se or us,ue capabilities
+define	BSOS		2		# backspace and overstrike with _
+define	CROS		3		# CR and overstrike with full line
+define	TOUP		4		# map standout chars to upper case
+
+# TTY descriptor structure.  Full termcap entry is the 'caplist' string.
+# The caplist is indexed at open time to permit a binary search for
+# capabilities at run time.
+
+define	T_MEMINCR	512		# increment if overflow occurs
+define	T_OFFCAP	215		# struct offset to caplist field
+define	MAX_CAPS	100		# maximum capabilities
+define	MAX_COORDS	7		# maximum coords for ttysubi
+define	SZ_CTRLSTR	50		# buffer size for control strings
+define	LEN_DEFTTY	(256+1024)	# initial length of tty structure
+
+define	T_LEN		Memi[$1]	# length of tty structure
+define	T_OP		Memi[$1+1]	# offset into caplist
+define	T_PADCHAR	Memi[$1+2]	# pad character for delays
+define	T_TABCHAR	Memi[$1+3]	# tab character, if HW tabs ok
+define	T_BSOK		Memi[$1+4]	# terminal backspaces with BS
+define	T_HTOK		Memi[$1+5]	# term has HT (horiz tab) in hardware
+define	T_AM		Memi[$1+6]	# term has automargin advance
+define	T_SOTYPE	Memi[$1+7]	# type of standout mode (ttyputline)
+define	T_BAUD		Memi[$1+8]	# baud rate for delays
+define	T_NLINES	Memi[$1+9]	# nlines on terminal at open
+define	T_NCOLS		Memi[$1+10]	# ncols on terminal at open
+define	T_NCAPS		Memi[$1+11]	# number of capabilities
+define	T_CAPLEN	Memi[$1+12]	# length of caplist, chars
+			# (extra space)
+define	T_CAPCODE	Memi[$1+15]	# cap code array: c1*128+c2
+define	T_CAPINDEX	Memi[$1+115]	# cap index array
+define	T_CAPLIST	Memc[($1+215-1)*SZ_STRUCT+1]	# termcap entry
diff --git a/sys/tty/ttycaps.x b/sys/tty/ttycaps.x
new file mode 100644
index 00000000..e6fcbcf0
--- /dev/null
+++ b/sys/tty/ttycaps.x
@@ -0,0 +1,13 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"tty.h"
+
+# TTYCAPS -- Return a pointer to the caplist field of an open TTY descriptor.
+
+pointer procedure ttycaps (tty)
+
+pointer	tty			# tty descriptor
+
+begin
+	return (P2C (tty + T_OFFCAP))
+end
diff --git a/sys/tty/ttycdes.x b/sys/tty/ttycdes.x
new file mode 100644
index 00000000..0b778a51
--- /dev/null
+++ b/sys/tty/ttycdes.x
@@ -0,0 +1,11 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYCDES -- Close a terminal opened with TTYODES or TTYGDES.
+
+procedure ttycdes (tty)
+
+pointer	tty
+
+begin
+	call ttyclose (tty)
+end
diff --git a/sys/tty/ttyclear.x b/sys/tty/ttyclear.x
new file mode 100644
index 00000000..86dac6ff
--- /dev/null
+++ b/sys/tty/ttyclear.x
@@ -0,0 +1,31 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+include	"tty.h"
+
+# TTYCLEAR -- Clear the terminal screen.
+
+procedure ttyclear (fd, tty)
+
+int	fd
+pointer	tty
+
+int	status
+bool	ttygetb()
+int	ttyctrl()
+errchk	ttygetb, ttyctrl
+
+begin
+	# If hardcopy terminal, output formfeed instead of clear.
+	if (ttygetb (tty, "ht"))
+	    status = ttyctrl (fd, tty, "ff", T_NLINES(tty))
+	else
+	    status = ERR
+	if (status == ERR)
+	    status = ttyctrl (fd, tty, "cl", T_NLINES(tty))
+
+	# If ff or cl capability not found, the best we can do is output
+	# a newline.
+	if (status == ERR)
+	    call putline (fd, "\n")
+end
diff --git a/sys/tty/ttyclln.x b/sys/tty/ttyclln.x
new file mode 100644
index 00000000..34e57328
--- /dev/null
+++ b/sys/tty/ttyclln.x
@@ -0,0 +1,32 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+include	"tty.h"
+
+# TTYCLEARLN -- Clear the current line.  The cursor is left positioned at the
+# left margin.  If the clear has to be performed by overwriting the line with
+# blanks, the final column is not cleared.
+
+procedure ttyclearln (fd, tty)
+
+int	fd
+pointer	tty
+pointer	sp, buf
+int	nchars, ttygets()
+errchk	salloc, ttygets, putc, ttywrite, fprintf, pargi
+
+begin
+	call smark (sp)
+	call salloc (buf, SZ_CTRLSTR, TY_CHAR)
+
+	nchars = ttygets (tty, "ce", Memc[buf], SZ_CTRLSTR)
+	if (nchars > 0) {
+	    call putci (fd, '\r')
+	    call ttywrite (fd, tty, Memc[buf], nchars, 1)
+	} else {
+	    call fprintf (fd, "\r%*w\r")
+		call pargi (T_NCOLS(tty) - 1)
+	}
+
+	call sfree (sp)
+end
diff --git a/sys/tty/ttyclose.x b/sys/tty/ttyclose.x
new file mode 100644
index 00000000..f30644dd
--- /dev/null
+++ b/sys/tty/ttyclose.x
@@ -0,0 +1,11 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYCLOSE -- Close the tty terminal descriptor opened with TTYOPEN.
+
+procedure ttyclose (tty)
+
+pointer	tty
+
+begin
+	call mfree (tty, TY_STRUCT)
+end
diff --git a/sys/tty/ttyctrl.x b/sys/tty/ttyctrl.x
new file mode 100644
index 00000000..3a66e961
--- /dev/null
+++ b/sys/tty/ttyctrl.x
@@ -0,0 +1,31 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+include	"tty.h"
+
+# TTYCTRL -- Output a control sequence to the terminal.
+
+int procedure ttyctrl (fd, tty, cap, afflncnt)
+
+int	fd, afflncnt
+char	cap[ARB]
+pointer	tty
+
+pointer	sp, buf
+int	status, nchars, ttygets()
+errchk	ttygets, ttywrite
+
+begin
+	call smark (sp)
+	call salloc (buf, SZ_CTRLSTR, TY_CHAR)
+
+	nchars = ttygets (tty, cap, Memc[buf], SZ_CTRLSTR)
+	if (nchars > 0) {
+	    call ttywrite (fd, tty, Memc[buf], nchars, afflncnt)
+	    status = OK
+	} else
+	    status = ERR
+
+	call sfree (sp)
+	return (status)
+end
diff --git a/sys/tty/ttydelay.x b/sys/tty/ttydelay.x
new file mode 100644
index 00000000..7fc6b3d4
--- /dev/null
+++ b/sys/tty/ttydelay.x
@@ -0,0 +1,31 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include "tty.h"
+
+# TTYDELAY -- Output a sequence of pad characters to create a delay, giving
+# the terminal time to complete some operation before being passed the next
+# request.
+
+procedure ttydelay (fd, tty, delay)
+
+int	fd			# output file
+pointer	tty			# tty descriptor
+int	delay			# desired milliseconds of delay
+
+int	padchar, npadchars
+real	msec_per_char
+int	and()
+
+begin
+	# Add padding if needed to generate delay.  (8 = nbits per char,
+	# baud is in units of bits per second).
+
+	if (delay > 0 && T_BAUD(tty) > 0) {
+	    padchar = and (T_PADCHAR(tty), 177B)
+	    msec_per_char = real(8 * 1000) / real(T_BAUD(tty)) 
+	    npadchars = int (delay / msec_per_char + 0.5)
+
+	    for (;  npadchars > 0;  npadchars = npadchars - 1)
+		call putci (fd, padchar)
+	}
+end
diff --git a/sys/tty/ttydevnm.x b/sys/tty/ttydevnm.x
new file mode 100644
index 00000000..76996d69
--- /dev/null
+++ b/sys/tty/ttydevnm.x
@@ -0,0 +1,41 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+
+# TTYDEVNAME -- Extract the logical device name from a full device specification
+# of the form  "node ! logical_device ? physical_device".  The node prefix, if
+# given, specifies the node from which the device is to be accessed (via the
+# network), and the physical device field contains particulars about the
+# physical device to be accessed.  Only the logical device field, used to index
+# the termcap file, is of any interest to TTY.  The logical device name
+# consists of chars chosen from the set [a-zA-Z0-9_+-].
+
+procedure ttydevname (device, ldevice, maxch)
+
+char	device[ARB]		# full device specification
+char	ldevice[maxch]		# logical device name
+int	maxch
+
+pointer	sp, nodename
+int	ip, op, ch
+int	ki_extnode()
+
+begin
+	call smark (sp)
+	call salloc (nodename, SZ_FNAME, TY_CHAR)
+
+	ip = ki_extnode (device, Memc[nodename], maxch, op) + 1
+
+	for (op=1;  device[ip] != EOS;  ip=ip+1) {
+	    ch = device[ip]
+	    if (!(IS_ALNUM(ch) || ch == '_' || ch == '+' || ch == '-')) {
+		ldevice[op] = EOS
+		break
+	    } else {
+		ldevice[op] = ch
+		op = op + 1
+	    }
+	}
+
+	call sfree (sp)
+end
diff --git a/sys/tty/ttygdes.x b/sys/tty/ttygdes.x
new file mode 100644
index 00000000..8eff579a
--- /dev/null
+++ b/sys/tty/ttygdes.x
@@ -0,0 +1,148 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<syserr.h>
+include	<ctype.h>
+include	<chars.h>
+include	"tty.h"
+
+define	DEF_BAUDRATE	9600
+
+# TTYGDES -- Open a TTY graphics stdgraph descriptor.  If ttyname is
+# "stdgraph" or "stdplot", get the name of the physical graphics device
+# from the environment.  The name of the graphcap file is fetched from the
+# environment and the graphcap file is searched for an entry corresponding
+# to the named device.
+# 
+# The descriptor is then allocated, and the graphcap entry read in.  Graphcap
+# permits an entry to be defined in terms of another entry with the "tc"
+# field; we must expand such references by rescanning the file once for each
+# such reference.  Finally, the graphcap entry is indexed for efficient access.
+# The form of a graphcap entry is identical to that for a termcap entry.
+
+pointer procedure ttygdes (ttyname)
+
+char	ttyname[ARB]
+
+int	nchars
+pointer	sp, ttysource, device, devname, fname, tty
+pointer	ttyopen()
+extern	g_ttyload()
+bool	streq(), ttygetb()
+int	fnldir(), ttygeti(), ttygets()
+int	envgets(), envgeti()
+errchk	envgets, envgeti, ttyopen, ttygets, syserrs
+errchk	tty_index_caps, ttygeti, envindir
+
+string	stdgraph "stdgraph"
+string	stdimage "stdimage"
+string	stdplot  "stdplot"
+string	graphcap "graphcap"
+
+begin
+	call smark (sp)
+	call salloc (ttysource, SZ_FNAME, TY_CHAR)
+	call salloc (devname, SZ_FNAME, TY_CHAR)
+	call salloc (device, SZ_FNAME, TY_CHAR)
+	call salloc (fname, SZ_FNAME, TY_CHAR)
+
+	# Resolve any indirection in the device name.
+	call envindir (ttyname, Memc[devname], SZ_FNAME)
+
+	# Get device name or graphcap file name.
+	if (streq (Memc[devname], stdgraph)) {
+	    if (envgets (stdgraph, Memc[ttysource], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, stdgraph)
+	} else if (streq (Memc[devname], stdimage)) {
+	    if (envgets (stdimage, Memc[ttysource], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, stdimage)
+	} else if (streq (Memc[devname], stdplot)) {
+	    if (envgets (stdplot, Memc[ttysource], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, stdplot)
+	} else
+	    call strcpy (Memc[devname], Memc[ttysource], SZ_FNAME)
+
+	# If ttysource is a filename, we assume that it is the name of
+	# a graphcap format file, the first entry of which (matched by the
+	# null device name) is the entry for the device.  Otherwise,
+	# ttysource is the name of the desired graphcap entry in the regular
+	# graphcap file.
+
+	if (fnldir (Memc[ttysource], Memc[fname], SZ_FNAME) > 0) {
+	    call strcpy (Memc[ttysource], Memc[fname], SZ_FNAME)
+	    Memc[device] = EOS
+	} else {
+	    if (envgets (graphcap, Memc[fname], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, graphcap)
+	    call strcpy (Memc[ttysource], Memc[device], SZ_FNAME)
+	}
+
+	# Truncate the device name if device fields are appended.
+	call ttydevname (Memc[device], Memc[device], SZ_FNAME)
+
+	# Allocate and initialize the tty descriptor structure.  Fetch graphcap
+	# entry from graphcap file into descriptor.  The G_TTYLOAD procedure,
+	# passed as an argument to TTYOPEN, is searched for cached termcap
+	# entries before accessing the actual file.
+
+	tty = ttyopen (Memc[fname], Memc[device], g_ttyload)
+
+	# Prepare index of fields in the descriptor, so that we can more
+	# efficiently search for fields later.
+
+	call tty_index_caps (tty, T_CAPCODE(tty), T_CAPINDEX(tty), T_NCAPS(tty))
+
+	# Determine whether or not the stdgraph device can backspace with BS.
+	if (ttygetb (tty, "bs"))
+	    T_BSOK(tty) = YES
+	else
+	    T_BSOK(tty) = NO
+
+	# Determine whether or not the stdgraph device can expand tabs.
+	# If it can but it requires some long string, don't bother.
+
+	T_HTOK(tty) = NO
+	T_TABCHAR(tty) = 0
+	if (ttygetb (tty, "pt")) {
+	    nchars = ttygets (tty, "ta", Memc[fname], SZ_FNAME)
+	    if (nchars <= 0) {
+		T_HTOK(tty) = YES
+		T_TABCHAR(tty) = '\t'
+	    } else if (nchars == 1) {
+		T_HTOK(tty) = YES
+		T_TABCHAR(tty) = Memc[fname]
+	    }
+	}
+
+	# Determine the optimimum mode for handling standout mode control,
+	# and save in the descriptor.
+
+	if (ttygetb (tty, "so")) {
+	    T_SOTYPE(tty) = SOSE		# use so, se
+	} else if (ttygetb (tty, "os")) {
+	    if (T_BSOK(tty) == YES || ttygetb (tty, "bc"))
+		T_SOTYPE(tty) = BSOS		# backspace, ostrike
+	    else
+		T_SOTYPE(tty) = CROS		# ostrike whole line
+	} else
+	    T_SOTYPE(tty) = TOUP		# to upper case
+
+	# Get pad char and baud rate (used by ttyputs to generate delays)
+	# and put in descriptor for efficient access.  Also get tty screen
+	# dimensions since they are fundamental and will probably prove
+	# useful later.
+
+	T_PADCHAR(tty) = ttygeti (tty, "pc")	# returns 0 if field not found
+	T_NLINES(tty)  = ttygeti (tty, "li")
+	T_NCOLS(tty)   = ttygeti (tty, "co")
+
+	# Baud rate may not be right if device is attached to the host, and
+	# and user is working remotely.  Nonetheless it is safer to pick up
+	# the value from the environment than to assume a default.
+
+	iferr (T_BAUD(tty) = envgeti ("ttybaud"))
+	    T_BAUD(tty) = DEF_BAUDRATE
+
+	call sfree (sp)
+	return (tty)
+end
diff --git a/sys/tty/ttygetb.x b/sys/tty/ttygetb.x
new file mode 100644
index 00000000..8c6fdbd4
--- /dev/null
+++ b/sys/tty/ttygetb.x
@@ -0,0 +1,15 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYGETB -- Determine whether or not a capability exists for a device.
+# If there is any entry at all, the capability exists.
+
+bool procedure ttygetb (tty, cap)
+
+pointer	tty			# tty descriptor
+char	cap[ARB]		# two character capability name
+pointer	ip
+int	tty_find_capability()
+
+begin
+	return (tty_find_capability (tty, cap, ip) == YES)
+end
diff --git a/sys/tty/ttygeti.x b/sys/tty/ttygeti.x
new file mode 100644
index 00000000..95384df3
--- /dev/null
+++ b/sys/tty/ttygeti.x
@@ -0,0 +1,27 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYGETI -- Get an integer valued capability.  If the capability is not
+# found for the device, or cannot be interpreted as an integer, zero is
+# returned.  Integer capabilities have the format ":xx#dd:".
+
+int procedure ttygeti (tty, cap)
+
+pointer	tty			# tty descriptor
+char	cap[ARB]		# two character capability name
+int	ival
+pointer	ip
+int	tty_find_capability(), ctoi()
+
+begin
+	if (tty_find_capability (tty, cap, ip) == NO)
+	    return (0)
+	else if (Memc[ip] != '#')
+	    return (0)
+	else {
+	    ip = ip + 1				# skip the '#'
+	    if (ctoi (Memc, ip, ival) == 0)
+		return (0)
+	    else
+		return (ival)
+	}
+end
diff --git a/sys/tty/ttygetr.x b/sys/tty/ttygetr.x
new file mode 100644
index 00000000..f4e2a8a8
--- /dev/null
+++ b/sys/tty/ttygetr.x
@@ -0,0 +1,41 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+
+# TTYGETR -- Get a real valued capability.  If the capability is not
+# found for the device, or cannot be interpreted as a number, zero is
+# returned.  Real valued capabilities have the format ":xx#num:".
+
+real procedure ttygetr (tty, cap)
+
+pointer	tty			# tty descriptor
+char	cap[ARB]		# two character capability name
+
+char	numstr[MAX_DIGITS]
+int	np, op
+pointer	ip
+double	dval
+int	tty_find_capability(), ctod()
+
+begin
+	if (tty_find_capability (tty, cap, ip) == NO)
+	    return (0.0)
+	else if (Memc[ip] != '#')
+	    return (0.0)
+	else {
+	    # Extract the number into numstr.  Cannot convert in place in
+	    # the table because the ":" delimiter will by interpreted by
+	    # ctod as for a sexagesimal number.
+	    op = 1
+	    for (ip=ip+1;  op <= MAX_DIGITS && Memc[ip] != ':';  ip=ip+1) {
+		numstr[op] = Memc[ip]
+		op = op + 1
+	    }
+	    numstr[op] = EOS
+	    np = 1
+	    if (ctod (numstr, np, dval) == 0)
+		return (0.0)
+	    else
+		return (dval)
+	}
+end
diff --git a/sys/tty/ttygets.x b/sys/tty/ttygets.x
new file mode 100644
index 00000000..23da69e1
--- /dev/null
+++ b/sys/tty/ttygets.x
@@ -0,0 +1,73 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+
+.help ttygets
+.nf ___________________________________________________________________________
+TTYGETS -- Get the string value of a capability.  Process all termcap escapes.
+These are:
+
+	\E		ascii esc (escape)
+	^X		control-X (i.e., ^C=03B, ^Z=032B, etc.)
+	\[nrtbf]	newline, return, tab, backspace, formfeed
+	\ddd		octal value of character
+	\^		the character ^
+	\\		the character \
+
+The character ':' may not be placed directly in a capability string; it
+should be given as \072 instead.  The null character is represented as \200;
+all characters are masked to 7 bits upon output by TTYPUTS, hence \200
+is sent to the terminal as NUL.
+.endhelp ______________________________________________________________________
+
+int procedure ttygets (tty, cap, outstr, maxch)
+
+pointer	tty			# tty descriptor
+char	cap[ARB]		# two character capability name
+char	outstr[ARB]		# receives cap string
+int	maxch			# size of outstr
+
+char	ch
+pointer	ip
+int	op, junk, temp
+int	tty_find_capability(), cctoc()
+
+begin
+	op = 1
+
+	if (tty_find_capability (tty, cap, ip) == YES) {
+	    # Skip the '=' which follows the two character capability name.
+	    if (Memc[ip] == '=')
+		ip = ip + 1
+
+	    # Extract the string, processing all escapes.
+	    for (ch=Memc[ip];  ch != ':';  ch=Memc[ip]) {
+		if (ch == '^') {
+		    ip = ip + 1
+		    temp = Memc[ip]
+		    ch = mod (temp, 40B)
+		} else if (ch == '\\') {
+		    switch (Memc[ip+1]) {
+		    case 'E':
+			ip = ip + 1
+			ch = ESC
+		    case '^', ':', '\\':
+			ip = ip + 1
+			ch = Memc[ip]
+		    default:
+			junk = cctoc (Memc, ip, ch)
+			ip = ip - 1
+		    }
+		}
+
+		outstr[op] = ch
+		op = op + 1
+		ip = ip + 1
+		if (op >= maxch)
+		    break
+	    }
+	}
+
+	outstr[op] = EOS
+	return (op-1)
+end
diff --git a/sys/tty/ttygoto.x b/sys/tty/ttygoto.x
new file mode 100644
index 00000000..d8896125
--- /dev/null
+++ b/sys/tty/ttygoto.x
@@ -0,0 +1,78 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+include	"tty.h"
+
+# TTYGOTO -- Position the cursor to the given absolute screen coordinates.
+# We do not require any knowledge of the current screen position; many programs
+# will wish to do cursor positioning at a lower level to take advantage of
+# knowledge of the current position.
+
+procedure ttygoto (fd, tty, col, line)
+
+int	fd			# output stream
+pointer	tty			# termcap descriptor
+int	col			# destination column
+int	line			# destination line
+
+pointer	sp, cm_in, cm_out
+int	coords[2], nchars, i
+int	ttygets(), ttysubi()
+errchk	salloc, ttygets, ttyputs, ttywrite
+
+begin
+	call smark (sp)
+	call salloc (cm_in, SZ_CTRLSTR, TY_CHAR)
+	call salloc (cm_out, SZ_LINE, TY_CHAR)
+
+	# Use the cursor motion control string to position cursor, if the
+	# terminal has such a capability.  Otherwise try to use primitive
+	# motion commands.
+
+	if (ttygets (tty, "cm", Memc[cm_in], SZ_CTRLSTR) > 0) {
+	    # Coordinates are ordered line,col in the termcap entry,
+	    # whereas our args are ordered col,line (e.g., x,y).  Store
+	    # in "coords" in the termcap order.
+
+	    coords[1] = line
+	    coords[2] = col
+	    nchars = ttysubi (Memc[cm_in], Memc[cm_out], SZ_LINE, coords, 2)
+
+	    # Output cursor motion control string to file.
+	    call ttywrite (fd, tty, Memc[cm_out], nchars, 1)
+
+	    # If unable to position to the exact coordinates, use primitive
+	    # motion commands to step the rest of the way in.  Do not abort
+	    # if unable to do so.
+
+	    if (coords[2] > 0) {
+		# Presumably we do not have to step in very often, so we do
+		# nothing special to buffer the backspace control sequence.
+		# Most terminals recognize BS in any case.
+
+		if (T_BSOK(tty) == YES) {
+		    Memc[cm_out] = BS
+		    Memc[cm_out+1] = EOS
+		} else if (ttygets (tty, "bc", Memc[cm_out], SZ_CTRLSTR) == 0)
+		    Memc[cm_out] = EOS
+
+		for (i=coords[2];  i > 0;  i=i-1)
+		    call ttyputs (fd, tty, Memc[cm_out], 1)
+	    }
+
+	    # Now adjust vertical position if necessary.
+	    if (coords[1] > 0) {
+		if (ttygets (tty, "up", Memc[cm_out], SZ_CTRLSTR) > 0)
+		    for (i=coords[1];  i > 0;  i=i-1)
+			call ttyputs (fd, tty, Memc[cm_out], 1)
+	    }
+
+	} else {
+	    # Terminal has no nifty cursor addressing capability; add code here
+	    # to position cursor by generating a sequence of more primitive
+	    # codes.  Not going to bother with this for now.
+	    ;
+	}
+
+	call sfree (sp)
+end
diff --git a/sys/tty/ttygsize.x b/sys/tty/ttygsize.x
new file mode 100644
index 00000000..e4ccfa1a
--- /dev/null
+++ b/sys/tty/ttygsize.x
@@ -0,0 +1,115 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ttyset.h>
+include	<ttset.h>
+include	<fset.h>
+
+define	TIMEOUT  2000		# timeout interval, msec, for size query
+
+
+# TTYGSIZE -- Get the width and height of the terminal screen in characters.
+# For a conventional terminal these values are given as constants in the
+# termcap entry for the device.  If the terminal has a screen which can vary
+# in size at runtime (e.g., a window on a workstation), then the screen size
+# is queried at runtime.
+
+procedure ttygsize (in, out, tty, width, height)
+
+int	in, out			# input and output streams
+pointer	tty			# terminal descriptor
+int	width			# ncols on screen (out)
+int	height			# nlines on screen (out)
+
+pointer	sp, patbuf, buf, qs, wh, ip, op
+int	index, len_qs, len_wh, w_index, h_index, sv_iomode, nchars, junk
+
+int	patmake(), patindex(), gstrcpy(), ctoi()
+int	ttygets(), ttyread(), ttystati(), ttstati(), fstati()
+define	noquery_ 91
+errchk	ttyread
+
+begin
+	call smark (sp)
+	call salloc (patbuf, SZ_LINE, TY_CHAR)
+	call salloc (buf, SZ_LINE, TY_CHAR)
+	call salloc (qs, SZ_FNAME, TY_CHAR)
+	call salloc (wh, SZ_FNAME, TY_CHAR)
+
+	width = 0
+	height = 0
+	index = 0
+
+	# Just use the termcap values if in stty playback or record mode.
+	if (ttstati(in,TT_LOGIN) == YES || ttstati(in,TT_PLAYBACK) == YES)
+	    goto noquery_
+
+	len_qs = ttygets (tty, "qs", Memc[qs], SZ_FNAME)
+	len_wh = ttygets (tty, "wh", Memc[wh], SZ_FNAME)
+
+	# Process the string DS (decode size string) to map the %W %H fields
+	# into the pattern strings "%[0-9]*", noting the index positions of
+	# the W and H fields.
+
+	if (len_wh > 0) {
+	    op = buf
+	    for (ip=wh;  Memc[ip] != EOS;  ip=ip+1) {
+		if ((Memc[ip] == '%') && ip > wh && Memc[ip-1] != '\\' &&
+		    (Memc[ip+1] == 'W' || Memc[ip+1] == 'H')) {
+
+		    index = index + 1
+		    op = op + gstrcpy ("%[0-9]*", Memc[op], ARB)
+		    ip = ip + 1
+
+		    if (Memc[ip] == 'W')
+			w_index = index
+		    else
+			h_index = index
+		} else {
+		    Memc[op] = Memc[ip]
+		    op = op + 1
+		}
+	    }
+	    Memc[op] = EOS
+	    junk = patmake (Memc[buf], Memc[patbuf], SZ_LINE)
+	}
+
+	# Query the terminal for the screen size, read back and decode the
+	# encoded screen size string.
+
+	if (len_qs > 0 && len_wh > 0) {
+	    sv_iomode = fstati (in, F_IOMODE)
+	    if (sv_iomode != IO_RAW)
+		call fseti (in, F_IOMODE, IO_RAW)
+
+	    call ttywrite (out, tty, Memc[qs], len_qs, 0)
+	    call flush (out)
+
+	    nchars = ttyread (in, tty, Memc[buf],SZ_LINE,Memc[patbuf], TIMEOUT)
+	    if (nchars > 0) {
+		if (ctoi (Memc[buf],patindex(Memc[patbuf],w_index),width) <= 0)
+		    width = 0
+		if (ctoi (Memc[buf],patindex(Memc[patbuf],h_index),height) <= 0)
+		    height = 0
+	    }
+
+	    if (sv_iomode != IO_RAW)
+		call fseti (in, F_IOMODE, sv_iomode)
+
+	    if (width == 0 && nchars == 0) {
+		call eprintf ("timeout - terminal type set wrong? ")
+		call eprintf ("(`stty termtype' to reset)\n")
+	    }
+	}
+
+noquery_
+	# If we still do not know the screen width or height, use the values
+	# given in the user environment, else in the termcap entry for the
+	# device.
+
+	if (width <= 0)
+	    width = ttystati (tty, TTY_NCOLS)
+	if (height <= 0)
+	    height = ttystati (tty, TTY_NLINES)
+
+	call sfree (sp)
+end
diff --git a/sys/tty/ttyindex.x b/sys/tty/ttyindex.x
new file mode 100644
index 00000000..6d9ae222
--- /dev/null
+++ b/sys/tty/ttyindex.x
@@ -0,0 +1,167 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<chars.h>
+include	"tty.h"
+
+.help index caplist
+.nf _________________________________________________________________________
+TTY_INDEX_CAPS -- Prepare an index into the caplist string, stored in
+the tty descriptor.  Each two character capability name maps into a unique
+integer code, called the capcode.  We prepare a list of capcodes, keeping
+only the first such code encountered in the case of multiple entries.
+The offset of the capability in the caplist string is associated with each
+capcode.  When these lists have been prepared, they are sorted to permit
+a binary search for capabilities at runtime.
+.endhelp ____________________________________________________________________
+
+procedure tty_index_caps (tty, t_capcode, t_capindex, ncaps)
+
+pointer	tty
+int	t_capcode[ARB], t_capindex[ARB]
+int	ncaps
+
+pointer	ip, caplist
+int	i, swap, capcode, temp
+int	tty_encode_capability()
+pointer	coerce()
+errchk	syserr
+
+begin
+	caplist = coerce (tty + T_OFFCAP, TY_STRUCT, TY_CHAR)
+	ip = caplist
+
+	# Scan the caplist and prepare the capcode and capindex lists.
+	for (ncaps=0;  ncaps <= MAX_CAPS;  ) {
+	    # Advance to the next capability field.  Normal exit occurs
+	    # when ':' is followed immediately by EOS.
+
+	    while (Memc[ip] != ':' && Memc[ip] != EOS)
+		ip = ip + 1
+	    if (Memc[ip+1] == EOS || Memc[ip] == EOS)
+		break
+
+	    ip = ip + 1					# skip the ':'
+	    capcode = tty_encode_capability (Memc[ip])
+
+	    # Is the capcode already in the list?  If not found, add it to
+	    # the list.
+	    for (i=1;  i <= ncaps && t_capcode[i] != capcode;  i=i+1)
+		;
+	    if (i > ncaps) {				# not found
+		ncaps = ncaps + 1
+		t_capcode[ncaps] = capcode
+		t_capindex[ncaps] = ip - caplist + 1
+	    }
+	}
+
+	if (ncaps > MAX_CAPS)
+	    call syserr (SYS_TTYOVFL)
+
+	# A simple interchange sort is sufficient here, even though it would
+	# not be hard to interface to qsort.  The longest termcap entries are
+	# about 50 caps, and the time req'd to sort such a short list is
+	# negligible compared to the time spent searching the termcap file.
+
+	if (ncaps > 1)
+	    repeat {
+		swap = 0
+		do i = 1, ncaps-1
+		    if (t_capcode[i] > t_capcode[i+1]) {
+			temp = t_capcode[i]
+			t_capcode[i] = t_capcode[i+1]
+			t_capcode[i+1] = temp
+			temp = t_capindex[i]
+			t_capindex[i] = t_capindex[i+1]
+			t_capindex[i+1] = temp
+			swap = 1
+		    }
+	    } until (swap == 0)
+end
+
+
+# TTY_FIND_CAPABILITY -- Search the caplist for the named capability.
+# If found, return the char pointer IP to the first char of the value field,
+# and YES as the function value.  If the first char in the capability string
+# is '@', the capability "is not present".
+
+int procedure tty_find_capability (tty, cap, ip)
+
+pointer	tty			# tty descriptor
+char	cap[ARB]		# two character name of capability
+pointer	ip			# pointer to capability string
+
+int	capcode, capnum
+int	tty_binsearch(), tty_encode_capability()
+pointer	coerce()
+errchk	syserr
+
+begin
+	if (tty == NULL)
+	    call syserr (SYS_TTYINVDES)
+
+	capcode = tty_encode_capability (cap)
+	capnum = tty_binsearch (capcode, T_CAPCODE(tty), T_NCAPS(tty))
+
+	if (capnum > 0) {
+	    # Add 2 to skip the two capname chars.
+	    ip = coerce (tty + T_OFFCAP, TY_STRUCT, TY_CHAR) +
+		T_CAPINDEX(tty+capnum-1) - 1 + 2
+	    if (Memc[ip] != '@')
+		return (YES)
+	}
+
+	return (NO)
+end
+
+
+# TTY_BINSEARCH -- Perform a binary search of the capcode array for the
+# indicated capability.  Return the array index of the capability if found,
+# else zero.
+
+int procedure tty_binsearch (capcode, t_capcode, ncaps)
+
+int	capcode
+int	t_capcode[ARB], ncaps
+int	low, high, pos, ntrips
+
+begin
+	low = 1
+	high = ncaps
+	pos = 0
+
+	# Cut range of search in half until code is found, or until range
+	# vanishes (high - low <= 1).  If neither high or low is the one,
+	# code is not found in the list.
+
+	do ntrips = 1, ncaps {
+	    pos = (high - low) / 2 + low
+	    if (t_capcode[low] == capcode)
+		return (low)
+	    else if (t_capcode[high] == capcode)
+		return (high)
+	    else if (pos == low)			# (high-low)/2 == 0
+		return (0)				# not found
+	    else if (t_capcode[pos] < capcode)
+		low = pos
+	    else
+		high = pos
+	} 
+
+	# Search cannot fail to converge unless there is a bug in the software
+	# somewhere.
+
+	call syserr (SYS_TTYBINSRCH)
+end
+
+
+# TTY_ENCODE_CAPABILITY -- Encode the two character capability string
+# as a unique integer value.
+
+int procedure tty_encode_capability (cap)
+
+char	cap[ARB]
+
+begin
+	return (ENCODE(cap))
+end
diff --git a/sys/tty/ttyinit.x b/sys/tty/ttyinit.x
new file mode 100644
index 00000000..9aeff341
--- /dev/null
+++ b/sys/tty/ttyinit.x
@@ -0,0 +1,46 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<chars.h>
+include	<fset.h>
+include	"tty.h"
+
+# TTYINIT -- Initialize the terminal.  The termcap entry potentially contains
+# two initialization entries.  The first, "is" is an initialization string
+# which is sent to the terminal.  The second, "if", is the name of a file
+# containing the initialization string.  If both are given, "if" is sent
+# followed by "is", however, there seems no reason to have an "is" string
+# if there is already an initialization file.  The names of initialization
+# files may be either IRAF virtual filenames or host system pathnames.
+
+procedure ttyinit (fd, tty)
+
+int	fd			# file descriptor of terminal
+pointer	tty			# tty descriptor
+
+pointer	sp, fname
+int	in, junk, rawmode
+int	ttyctrl(), ttygets(), open(), fstati()
+errchk	ttygets, fcopyo
+
+begin
+	call smark (sp)
+	call salloc (fname, SZ_PATHNAME, TY_CHAR)
+
+	# Output contents of initialization file, if any.
+	if (ttygets (tty, "if", Memc[fname], SZ_PATHNAME) > 0)
+	    iferr (in = open (Memc[fname], READ_ONLY, TEXT_FILE))
+		call erract (EA_WARN)
+	    else {
+		rawmode = fstati (fd, F_RAW)
+		call fseti (fd, F_RAW, YES)
+		call fcopyo (in, fd)
+		call fseti (fd, F_RAW, rawmode)
+		call close (in)
+	    }
+
+	# Output initialization string.
+	junk = ttyctrl (fd, tty, "is", 1)
+
+	call sfree (sp)
+end
diff --git a/sys/tty/ttyload.x b/sys/tty/ttyload.x
new file mode 100644
index 00000000..117575b8
--- /dev/null
+++ b/sys/tty/ttyload.x
@@ -0,0 +1,44 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYLOAD -- Search the database of compiled TERMCAP entries for the named
+# device, and if found, return the CAPLIST string (list of device capabilities)
+# in the output string.  The number of characters output is returned as the
+# function value.  The compiled database is defined by the include file
+# "cachet.dat", which serves as a cache for the TERMCAP entries of heavily
+# used devices (see TTYCOMPILE).
+# 
+# N.B.: This file can serve as a template for generating TTYLOAD procedures
+# for devices other than the terminal.  Change the name TTYLOAD to something
+# else, change the name of the include file, generate a different include file
+# with TTYCOMPILE, and you are in business.
+
+int procedure ttyload (fname, device, outstr, maxch)
+
+char	fname[ARB]		# name of termcap file being referenced
+char	device[ARB]		# device name as in TERMCAP entry
+char	outstr[maxch]		# output string to receive caplist
+int	maxch
+
+int	dev
+bool	streq(), strne()
+int	gstrcpy()
+
+include	"dev$cachet.dat"
+
+begin
+	# If the name of the file being referenced is not the same as the
+	# name of the file used to build the cache, then the cache is
+	# invalidated.
+
+	if (strne (fname, sbuf[termcap_filename]))
+	    return (0)
+
+	# NDEVICES, DEVNAME, DEVCAPS, and SBUF are defined and initialized
+	# in the include file.
+
+	do dev = 1, ndevices
+	    if (streq (sbuf[devname[dev]], device))
+		return (gstrcpy (sbuf[devcaps[dev]], outstr, maxch))
+
+	return (0)
+end
diff --git a/sys/tty/ttyodes.x b/sys/tty/ttyodes.x
new file mode 100644
index 00000000..a01ffdca
--- /dev/null
+++ b/sys/tty/ttyodes.x
@@ -0,0 +1,183 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<syserr.h>
+include	<ctype.h>
+include	<chars.h>
+include	"tty.h"
+
+define	DEF_BAUDRATE	9600
+define	DEF_TTYNLINES	24
+define	DEF_TTYNCOLS	80
+
+# TTYODES -- Open a TTY terminal descriptor.  If ttyname is "terminal" or
+# "printer", get the name of the default terminal or printer from the
+# environment.  If the "name" of the terminal is a filename, the first termcap
+# entry in the name file is read.  Otherwise, the termcap file is searched for
+# an entry corresponding to the named device.
+# 
+# The descriptor is then allocated, and the termcap entry read in.  Termcap
+# permits an entry to be defined in terms of another entry with the "tc"
+# field; we must expand such references by rescanning the file once for each
+# such reference.  Finally, the termcap entry is indexed for efficient access.
+# 
+# The form of a termcap entry is one logical line (usually extending over
+# several physical lines using newline escapes), consisting of several alternate
+# names for the device, followed by a list of ':' delimited capabilities:
+# 
+# 	name1 '|' name2 [ '|' namen... ] ':' cap ':' [ cap ':' ... ]
+# 
+# If the final cap in an entry is of the form ":tc=name:", the capability
+# is replaced by the capability list of the named entry.
+
+pointer procedure ttyodes (ttyname)
+
+char	ttyname[ARB]
+
+bool	istty
+int	nchars
+pointer	sp, ttysource, device, devname, fname, tty
+
+pointer	ttyopen()
+extern	ttyload()
+bool	streq(), ttygetb()
+int	envgets(), envgeti(), btoi()
+int	fnldir(), ttygeti(), ttygets()
+errchk	syserrs, tty_index_caps, ttygeti, ttyopen, ttygets
+errchk	envgets, envgeti, envindir
+
+string	terminal "terminal"	# terminal named in environment
+string	printer  "printer"	# printer named in environment
+string	termcap  "termcap"	# name of termcap file stored in env. too
+
+begin
+	call smark (sp)
+	call salloc (ttysource, SZ_FNAME, TY_CHAR)
+	call salloc (devname, SZ_FNAME, TY_CHAR)
+	call salloc (device, SZ_FNAME, TY_CHAR)
+	call salloc (fname, SZ_FNAME, TY_CHAR)
+
+	# Resolve any indirection in the device name.
+	call envindir (ttyname, Memc[devname], SZ_FNAME)
+
+	# Get device name or termcap file name.
+	if (streq (Memc[devname], terminal)) {
+	    if (envgets (terminal, Memc[ttysource], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, terminal)
+	} else if (streq (Memc[devname], printer)) {
+	    if (envgets (printer, Memc[ttysource], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, printer)
+	} else
+	    call strcpy (Memc[devname], Memc[ttysource], SZ_FNAME)
+
+	# If ttysource is a filename, we assume that it is the name of
+	# a termcap format file, the first entry of which (matched by the
+	# null device name) is the entry for the device.  Otherwise,
+	# ttysource is the name of the desired termcap entry in the regular
+	# termcap file.
+
+	if (fnldir (Memc[ttysource], Memc[fname], SZ_FNAME) > 0) {
+	    call strcpy (Memc[ttysource], Memc[fname], SZ_FNAME)
+	    Memc[device] = EOS
+	} else {
+	    if (envgets (termcap, Memc[fname], SZ_FNAME) <= 0)
+		call syserrs (SYS_ENVNF, termcap)
+	    call strcpy (Memc[ttysource], Memc[device], SZ_FNAME)
+	}
+
+	# Truncate the device name if device fields are appended.
+	call ttydevname (Memc[device], Memc[device], SZ_FNAME)
+
+	# Allocate and initialize the tty descriptor structure and fetch
+	# termcap entry from termcap file.  The TTYLOAD procedure, passed
+	# as an argument to TTYOPEN, is searched for cached termcap entries
+	# before accessing the actual file.
+
+	tty = ttyopen (Memc[fname], Memc[device], ttyload)
+
+	# Prepare index of fields in the descriptor, so that we can more
+	# efficiently search for fields later.
+
+	call tty_index_caps (tty, T_CAPCODE(tty), T_CAPINDEX(tty),
+	    T_NCAPS(tty))
+
+	# Determine whether or not the terminal can backspace with BS.
+	if (ttygetb (tty, "bs"))
+	    T_BSOK(tty) = YES
+	else
+	    T_BSOK(tty) = NO
+
+	# Determine whether or not the stdgraph device can expand tabs.
+	# If it can but it requires some long string, don't bother.
+
+	T_HTOK(tty) = NO
+	T_TABCHAR(tty) = 0
+	if (ttygetb (tty, "pt")) {
+	    nchars = ttygets (tty, "ta", Memc[fname], SZ_FNAME)
+	    if (nchars <= 0) {
+		T_HTOK(tty) = YES
+		T_TABCHAR(tty) = '\t'
+	    } else if (nchars == 1) {
+		T_HTOK(tty) = YES
+		T_TABCHAR(tty) = Memc[fname]
+	    }
+	}
+
+	# Does the terminal autoadvance at the right margin?
+	T_AM(tty) = btoi (ttygetb (tty, "am"))
+
+	# Determine the optimimum mode for handling standout mode control,
+	# and save in the descriptor.
+
+	if (ttygetb (tty, "so")) {
+	    T_SOTYPE(tty) = SOSE		# use so, se
+	} else if (ttygetb (tty, "os")) {
+	    if (T_BSOK(tty) == YES || ttygetb (tty, "bc"))
+		T_SOTYPE(tty) = BSOS		# backspace, ostrike
+	    else
+		T_SOTYPE(tty) = CROS		# ostrike whole line
+	} else
+	    T_SOTYPE(tty) = TOUP		# to upper case
+
+	# Get pad char and baud rate (used by ttyputs to generate delays)
+	# and put in descriptor for efficient access.  Also get tty screen
+	# dimensions since they are fundamental and will probably prove
+	# useful later.
+
+	T_PADCHAR(tty) = ttygeti (tty, "pc")	# returns 0 if field not found
+
+	# Allow environment variables to override physical screen dimensions
+	# if device is the standard terminal.
+
+	istty = (streq (Memc[devname], terminal))
+
+	# Get nlines.
+	if (istty)
+	    iferr (T_NLINES(tty) = envgeti ("ttynlines"))
+		T_NLINES(tty) = 0
+	if (T_NLINES(tty) <= 0)
+	    iferr (T_NLINES(tty) = ttygeti (tty, "li"))
+		T_NLINES(tty) = 0
+	if (T_NLINES(tty) <= 0)
+	    T_NLINES(tty) = DEF_TTYNLINES
+
+	# Get ncols.
+	if (istty)
+	    iferr (T_NCOLS(tty) = envgeti ("ttyncols"))
+		T_NCOLS(tty) = 0
+	if (T_NCOLS(tty) <= 0)
+	    iferr (T_NCOLS(tty) = ttygeti (tty, "co"))
+		T_NCOLS(tty) = 0
+	if (T_NCOLS(tty) <= 0)
+	    T_NCOLS(tty) = DEF_TTYNCOLS
+
+	# Baud rate may not be right if device is a printer attached to the
+	# host, and user is working remotely.  Nonetheless it is safer to pick
+	# up the value from the environment than to assume a default.
+
+	iferr (T_BAUD(tty) = envgeti ("ttybaud"))
+	    T_BAUD(tty) = DEF_BAUDRATE
+
+	call sfree (sp)
+	return (tty)
+end
diff --git a/sys/tty/ttyopen.x b/sys/tty/ttyopen.x
new file mode 100644
index 00000000..07577821
--- /dev/null
+++ b/sys/tty/ttyopen.x
@@ -0,0 +1,299 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<syserr.h>
+include	<ctype.h>
+include	<chars.h>
+include	"tty.h"
+
+# TTYOPEN -- Scan the named TERMCAP style file for the entry for the named
+# device, and if found allocate a TTY descriptor structure, leaving the
+# termcap entry for the device in the descriptor.
+
+pointer procedure ttyopen (termcap_file, device, ttyload)
+
+char	termcap_file[ARB]	# termcap file to be scanned
+char	device[ARB]		# name of device to be scanned for
+extern	ttyload()		# fetches pre-compiled entries from a cache
+int	ttyload()
+
+int	maxch, nchars
+pointer	tty, sp, devname
+errchk	ttyload, calloc, realloc
+
+begin
+	call smark (sp)
+	call salloc (devname, SZ_FNAME, TY_CHAR)
+
+	# Truncate the device name if device fields are appended.
+	call strcpy (device, Memc[devname], SZ_FNAME)
+	call ttydevname (Memc[devname], Memc[devname], SZ_FNAME)
+
+	# Allocate and initialize the tty descriptor structure.
+	call calloc (tty, LEN_DEFTTY, TY_STRUCT)
+
+	T_LEN(tty) = LEN_DEFTTY
+	T_OP(tty) = 1
+
+	# Call the TTYLOAD procedure to see if the TERMCAP entry for the device
+	# is in the cache of pre-compiled device entries.  If not in cache,
+	# we must scan the actual termcap file.
+
+	maxch = (T_LEN(tty) - T_OFFCAP) * SZ_STRUCT
+	nchars = ttyload (termcap_file, Memc[devname], T_CAPLIST(tty), maxch)
+
+	if (nchars > 0) {
+	    # Found device in cache.
+	    T_OP(tty) = nchars + 1
+	    T_CAPLEN(tty) = T_OP(tty)
+	} else {
+	    # Must scan the source file.
+	    iferr (call tty_scan_termcap_file (tty, termcap_file,
+		Memc[devname])) {
+		call mfree (tty, TY_STRUCT)
+		call erract (EA_ERROR)
+	    }
+	}
+
+	# Call realloc to return any unused space in the descriptor.
+	T_LEN(tty) = T_OFFCAP + (T_OP(tty) + SZ_STRUCT-1) / SZ_STRUCT
+	call realloc (tty, T_LEN(tty), TY_STRUCT)
+
+	call sfree (sp)
+	return (tty)
+end
+
+
+# TTY_SCAN_TERMCAP_FILE -- Open and scan the named TERMCAP format database
+# file for the named device.  Fetch termcap entry, expanding any and all
+# "tc" references by repeatedly rescanning file.
+
+procedure tty_scan_termcap_file (tty, termcap_file, devname)
+
+pointer	tty			# tty descriptor structure
+char	termcap_file[ARB]	# termcap format file to be scanned
+char	devname[ARB]		# termcap entry to be scanned for
+
+int	fd, ntc
+pointer	sp, device, ip, op, caplist
+int	open(), strlen(), strncmp()
+pointer	coerce()
+errchk	open, syserrs
+
+begin
+	call smark (sp)
+	call salloc (device, SZ_FNAME, TY_CHAR)
+
+	fd = open (termcap_file, READ_ONLY, TEXT_FILE)
+	call strcpy (devname, Memc[device], SZ_FNAME)
+
+	ntc = 0
+	repeat {
+	    iferr (call tty_fetch_entry (fd, Memc[device], tty)) {
+		call close (fd)
+		call erract (EA_ERROR)
+	    }
+
+	    # Back up to start of last field in entry.
+	    caplist = coerce (tty + T_OFFCAP, TY_STRUCT, TY_CHAR)
+	    ip = caplist + T_OP(tty)-1 - 2
+	    while (ip > caplist && Memc[ip] != ':')
+		ip = ip - 1
+
+	    # If last field is "tc", backup op so that the tc field gets
+	    # overwritten with the referenced entry.
+
+	    if (strncmp (Memc[ip+1], "tc", 2) == 0) {
+		# Check for recursive tc reference.
+		ntc = ntc + 1
+		if (ntc > MAX_TC_NESTING) {
+		    call close (fd)
+		    call syserrs (SYS_TTYTC, Memc[device])
+		}
+
+		# Set op to point to the ":" in ":tc=file".
+		T_OP(tty) = ip - caplist + 1
+
+		# Get device name from tc field, and loop again to fetch new
+		# entry.
+		ip = ip + strlen (":tc=")
+		for (op=device;  Memc[ip] != EOS && Memc[ip] != ':';  ip=ip+1) {
+		    Memc[op] = Memc[ip]
+		    op = op + 1
+		}
+		Memc[op] = EOS
+		call seek (fd, BOFL)
+	    } else
+		break
+	}
+
+	call close (fd)
+	call sfree (sp)
+end
+
+
+# TTY_FETCH_ENTRY -- Search the termcap file for the named entry, then read
+# the colon delimited capabilities list into the caplist field of the tty
+# descriptor.  If the caplist field fills up, allocate more space.
+
+procedure tty_fetch_entry (fd, device, tty)
+
+int	fd
+char	device[ARB]
+pointer	tty
+
+char	ch, lastch
+pointer	sp, ip, op, otop, lbuf, alias, caplist
+bool	device_found, streq()
+char	getc()
+int	getline(), tty_extract_alias()
+pointer	coerce()
+errchk	getline, getc, realloc, salloc
+define	errtn_ 91
+
+begin
+	call smark (sp)
+	call salloc (lbuf,  SZ_LINE,  TY_CHAR)
+	call salloc (alias, SZ_FNAME, TY_CHAR)
+
+	# Locate entry.  First line of each termcap entry contains a list
+	# of aliases for the device.  Only first lines and comment lines
+	# are left justified.
+
+	repeat {
+	    # Skip comment and continuation lines and blank lines.
+	    device_found = false
+
+	    if (getc (fd, ch) == EOF)
+		goto errtn_
+
+	    if (ch == '\n') {
+		# Skip a blank line.
+		next
+	    } else if (ch == '#' || IS_WHITE (ch)) {
+		# Discard the rest of the line and continue.
+		if (getline (fd, Memc[lbuf]) == EOF)
+		    goto errtn_
+		next
+	    }
+
+	    # Extract list of aliases.  The first occurrence of ':' marks
+	    # the end of the alias list and the beginning of the caplist.
+
+	    Memc[lbuf] = ch
+	    op = lbuf + 1
+
+	    for (;  getc(fd,ch) != ':';  op=op+1) {
+		Memc[op] = ch
+		if (ch == EOF || ch == '\n' || op-lbuf >= SZ_LINE) {
+		    goto errtn_
+		}
+	    }
+	    Memc[op] = EOS
+
+	    ip = lbuf
+	    while (tty_extract_alias (Memc, ip, Memc[alias], SZ_FNAME) > 0) {
+		if (device[1] == EOS || streq (Memc[alias], device)) {
+		    device_found = true
+		    break
+		} else if (Memc[ip] == '|')
+		    ip = ip + 1				# skip delimiter
+	    }
+
+	    # Skip rest of line if no match.
+	    if (!device_found) {
+		if (getline (fd, Memc[lbuf]) == EOF) {
+		    goto errtn_
+		}
+	    }
+	} until (device_found)
+
+	# Caplist begins at first ':'.  Each line has some whitespace at the
+	# beginning which should be skipped.  Escaped newline implies
+	# continuation.
+
+	caplist = coerce (tty + T_OFFCAP, TY_STRUCT, TY_CHAR)
+	op = caplist + T_OP(tty) - 1
+	otop = coerce (tty + T_LEN(tty), TY_STRUCT, TY_CHAR) - 1
+
+	# We are already positioned to the start of the caplist.
+	Memc[op] = ':'
+	op = op + 1
+	lastch = ':'
+
+	# Extract newline terminated caplist string.
+	while (getc (fd, ch) != EOF) {
+	    if (ch == '\\') {				# escaped newline?
+		if (getc (fd, ch) == '\n') {
+		    while (getc (fd, ch) != EOF)
+			if (!IS_WHITE(ch))
+			    break
+		    if (ch == EOF || ch == '\n')
+			goto errtn_
+		    # Avoid null entries ("::").
+		    if (ch == ':' && lastch == ':')
+			next
+		    else
+			Memc[op] = ch
+		} else {				# no, keep both chars
+		    Memc[op] = '\\'
+		    op = op + 1
+		    Memc[op] = ch
+		}
+	    } else if (ch == '\n') {			# normal exit
+		Memc[op] = EOS
+		T_OP(tty) = op - caplist + 1
+		T_CAPLEN(tty) = T_OP(tty)
+		call sfree (sp)
+		return
+	    } else
+		Memc[op] = ch
+
+	    # Increase size of buffer if necessary.  Note that realloc may 
+	    # move the buffer, so we must recalculate op and otop.
+
+	    lastch = ch
+	    op = op + 1
+	    if (op >= otop) {
+		T_OP(tty) = op - caplist + 1
+		T_LEN(tty) = T_LEN(tty) + T_MEMINCR
+		call realloc (tty, T_LEN(tty), TY_STRUCT)
+		op = caplist + T_OP(tty) - 1
+		otop = coerce (tty + T_LEN(tty), TY_STRUCT, TY_CHAR) - 1
+	    }
+	}
+
+errtn_
+ 	call sfree (sp)
+	call syserrs (SYS_TTYDEVNF, device)
+end
+
+
+# TTY_EXTRACT_ALIAS -- Extract a device alias string from the header of
+# a termcap entry.  The alias string is terminated by '|' or ':'.  Leave
+# ip pointing at the delimiter.  Return number of chars in alias string.
+
+int procedure tty_extract_alias (str, ip, outstr, maxch)
+
+char	str[ARB]		# first line of termcap entry
+int	ip			# on input, first char of alias
+char	outstr[ARB]
+int	maxch
+
+char	ch
+int	op
+
+begin
+	op = 1
+	for (ch=str[ip];  ch != '|' && ch != ':' && ch != EOS;  ch=str[ip]) {
+	    outstr[op] = ch
+	    op = min (maxch, op) + 1
+	    ip = ip + 1
+	}
+	outstr[op] = EOS
+
+	if (ch == EOS)
+	    return (0)
+	else
+	    return (op-1)
+end
diff --git a/sys/tty/ttyputl.x b/sys/tty/ttyputl.x
new file mode 100644
index 00000000..1510168c
--- /dev/null
+++ b/sys/tty/ttyputl.x
@@ -0,0 +1,322 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+include	<chars.h>
+include	"tty.h"
+
+.help ttyputline
+.nf ___________________________________________________________________________
+TTYPUTLINE -- Put a line to a tty device, processing any special control codes
+therein.  We are concerned with formfeeds, tabs, and standout mode.  Formfeeds
+are dealt with by sending the ff capability, if defined for the device (FF is
+sent if there is no ff entry).  Tabs are expanded if the device does not have
+hardware tabs; if tabs are not expanded, the ta capability is sent to the device
+for each tab (HT is sent if there is no ta string).
+
+Standout mode is more complex.  We distinguish between four types of devices
+for standout mode control (presented in order of desirability):
+
+    (1)	[SOSE] Device has so/se.  Map SO, SE chars in input stream into so/se
+	sequences.
+
+    (2)	[BSOS] Device can backspace and overstrike.  Backspace each printable
+	char in standout mode and overstrike with the underscore character.
+
+    (3) [CROS] Device cannot backspace, but can overstrike.  Follow the output
+	line with a CR and then a line consisting only of spaces and
+	underscores.
+
+    (4) [TOUP] No conventional way to generate standout mode for device.
+	Map alpha chars to upper case to make them standout.
+
+Long lines are automatically broken at the right margin.
+.endhelp ______________________________________________________________________
+
+
+procedure ttyputline (fd, tty, text, map_cc)
+
+int	fd			# output file
+pointer	tty			# TTY descriptor
+char	text[ARB]		# line of text to be output
+int	map_cc			# enable mapping of SO, SE control chars
+
+char	obuf[SZ_LINE]
+int	ip, op, pos, col, maxcols, tabstop, tabchar, ch
+errchk	write
+define	hardcase_ 91
+
+begin
+	maxcols = min (SZ_LINE, T_NCOLS(tty))
+	tabchar = T_TABCHAR(tty)
+	pos	= 1
+	col	= 1
+	op	= 1
+
+	# Optimize the special case of a line less than the maximum length
+	# which contains no special control characters.  As long as this is
+	# handled efficiently, the rest doesn't matter.
+
+	for (pos=1;  text[pos] != EOS;  pos=pos+1) {
+	    do ip = pos, ARB {
+		ch = text[ip]
+
+		if (ch >= ' ') {
+		    # Ordinary printable character; the most common case.
+		    obuf[op] = ch
+		    op  = op + 1
+		    col = col + 1
+
+		    # If col > maxcols then we have completely filled the
+		    # output line.  If there is more text to come we must
+		    # break the line.  If the next character is newline we
+		    # may also break the line and discard the newline.
+
+		    if (col > maxcols && text[ip+1] != EOS) {
+			if (T_AM(tty) == NO) {
+			    obuf[op] = '\n'
+			    op = op + 1
+			}
+			pos = ip
+			if (text[ip+1] == '\n')
+			    pos = pos + 1
+			break
+		    }
+
+		} else if (ch == '\n') {
+		    # End of line.
+		    obuf[op] = ch
+		    op  = op + 1
+		    pos = ip
+		    break
+
+		} else if (ch == '\t') {
+		    # Tab.
+		    tabstop = min (maxcols, ((col-1) / 8 + 1) * 8 + 1)
+		    if (tabchar != 0) {
+			obuf[op] = tabchar
+			op  = op + 1
+			col = tabstop
+		    } else {
+			while (col < tabstop) {
+			    obuf[op] = ' '
+			    op  = op + 1
+			    col = col + 1
+			}
+		    }
+
+		} else if (ch == EOS) {
+		    pos = ip - 1
+		    break
+
+		} else
+		    goto hardcase_
+	    }
+
+	    if (op > 1)
+		call write (fd, obuf, op - 1)
+
+	    op  = 1
+	    col = 1
+	}
+
+	return
+
+hardcase_
+	# Special processsing is needed.
+	call ttygputline (fd, tty, text, map_cc)
+end
+
+
+# TTYGPUTLINE -- This is the original ttypuline.  The code is not very
+# efficient, but it handles formfeeds, standout mode, etc. in a generalized
+# fashion.
+
+procedure ttygputline (fd, tty, text, map_cc)
+
+int	fd			# output file
+pointer	tty			# TTY descriptor
+char	text[ARB]		# line of text to be output
+int	map_cc			# enable mapping of SO, SE control chars
+
+pointer	sp, ostrike, op
+bool	so_seen, so_mode_in_effect
+int	ip, so_type, ocol, junk, ch, tabchar
+int	ttyctrl()
+errchk	tty_break_line, putci, ttyctrl, ttyso
+
+begin
+	call smark (sp)
+	call salloc (ostrike, SZ_LINE, TY_CHAR)
+
+	so_mode_in_effect = false
+	so_type = T_SOTYPE(tty)
+	tabchar = T_TABCHAR(tty)
+	so_seen = false
+	ocol	= 1
+	op	= ostrike
+
+	# Process the input line, mapping all known sequences.  Other control
+	# chars are passed on without modification.  The input line should be
+	# an entire line, or CROS mode will not work correctly.  Lines longer
+	# than T_NCOLS are broken at the right margin.
+
+	for (ip=1;  text[ip] != EOS;  ip=ip+1) {
+	    ch = text[ip]
+
+	    # Break line if newline seen or at right margin.
+	    if (ch == '\n' || ocol > T_NCOLS(tty)) {
+		call tty_break_line (fd, tty, ostrike, op, so_type, so_seen)
+		so_mode_in_effect = false
+		ocol = 1
+
+		# Output a newline if short line or the terminal does not
+		# have automargins.
+
+		if (ocol < T_NCOLS(tty) || T_AM(tty) == NO)
+		    call putci (fd, '\n')
+
+		# Fall through and output ch if ch was not newline.
+		if (ch == '\n')
+		    next
+	    }
+
+	    # Deal with common printable characters.  If standout mode is
+	    # in effect, we must take special actions to make the char
+	    # stand out if the terminal does not have the so/se capability.
+	    # Note that blanks may be made to standout; if this is not
+	    # desired, the high level code must turn standout mode on and off.
+
+	    if (ch >= BLANK) {
+		if (so_type != SOSE)
+		    switch (so_type) {
+		    case BSOS:
+			if (so_mode_in_effect) {
+			    call putci (fd, '_')
+			    if (T_BSOK(tty) == YES)
+				call putci (fd, BS)
+			    else
+				junk = ttyctrl (fd, tty, "bc", 1)
+			}
+		    case CROS:
+			if (so_mode_in_effect)
+			    Memc[op] = '_'
+			else
+			    Memc[op] = BLANK
+			op = op + 1
+		    case TOUP:
+			if (so_mode_in_effect && IS_LOWER(ch))
+			    ch = TO_UPPER (ch)
+		    }
+
+		call putci (fd, ch)
+		ocol = ocol + 1
+		next
+	    }
+
+	    # We get here only if the character is a control character.
+
+	    if (ch == '\t') {
+		# If hardware tab expansion is enabled, use that, otherwise
+		# wait and put out blanks in next block of code.
+
+		if (T_HTOK(tty) == YES) {
+		    call putci (fd, tabchar)
+		    if (so_type == CROS) {
+			Memc[op] = '\t'
+			op = op + 1
+		    }
+		}
+
+		# Keep track of virtual output column, also output blanks to
+		# expand tab if hardware expansion is disabled.
+
+		repeat {
+		    if (T_HTOK(tty) != YES) {
+			call putci (fd, BLANK)
+			if (so_type == CROS) {
+			    Memc[op] = BLANK
+			    op = op + 1
+			}
+		    }
+		    ocol = ocol + 1
+		} until (mod (ocol+TABSIZE-1, TABSIZE) == 0)
+
+	    } else if (ch == FF) {
+		# Formfeed breaks the output line if not at beginning of a
+		# line.
+
+		if (ocol > 1) {
+		    call tty_break_line (fd, tty, ostrike, op, so_type, so_seen)
+		    if (ocol < T_NCOLS(tty) || T_AM(tty) == NO)
+			call putci (fd, '\n')
+		}
+		if (ttyctrl (fd, tty, "ff", T_NLINES(tty)) == ERR)
+		    call putci (fd, FF)
+		ocol = 1
+		so_mode_in_effect = false
+
+	    } else if (ch == SO_ON) {
+		# Begin standout mode.
+		if (so_type == SOSE)
+		    call ttyso (fd, tty, YES)
+		so_mode_in_effect = true
+		so_seen = true
+
+	    } else if (ch == SO_OFF) {
+		# End standout mode.
+		if (so_type == SOSE)
+		    call ttyso (fd, tty, NO)
+		so_mode_in_effect = false
+
+	    } else {
+		# Unknown control character.  Do not increment ocol.
+		if (map_cc == YES) {
+		    call putci (fd, '^')
+		    call putci (fd, ch + 'A' - 1)
+		} else
+		    call putci (fd, ch)
+	    }
+	}
+
+	# If EOS is seen, but not newline, do not issue a newline, but do
+	# ignore contents of overstrike buffer.  Thus, we can be used to output
+	# portions of a line on non-CROS terminals.
+
+	call sfree (sp)
+end
+
+
+# TTY_BREAK_LINE -- Break the output line.  If overstrike is selected,
+# overstrike output line with the ostrike line.  We assume that OP is
+# valid only if so_type is CROS.  Note that OP and SO_SEEN are reset.
+
+procedure tty_break_line (fd, tty, ostrike, op, so_type, so_seen)
+
+int	fd
+pointer	tty, ostrike, op
+int	so_type
+bool	so_seen
+
+int	ch
+pointer	ip
+
+begin
+	# If carriage return, overstrike is enabled and the line had a standout
+	# mode directive, output the overstrike line.
+
+	if (so_type == CROS && so_seen) {
+	    call putci (fd, '\r')
+	    Memc[op] = EOS
+
+	    # Output overstrike line.
+	    for (ip=ostrike;  Memc[ip] != EOS;  ip=ip+1) {
+		ch = Memc[ip]
+		if (ch == '\t')
+		    ch = T_TABCHAR(tty)
+		call putci (fd, ch)
+	    }
+	}
+
+	op = ostrike
+	so_seen = false
+end
diff --git a/sys/tty/ttyputs.x b/sys/tty/ttyputs.x
new file mode 100644
index 00000000..aeec99ef
--- /dev/null
+++ b/sys/tty/ttyputs.x
@@ -0,0 +1,15 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYPUTS -- Put an EOS delimited  control string to the output file.
+
+procedure ttyputs (fd, tty, ctrlstr, afflncnt)
+
+int	fd			# output file
+pointer	tty			# terminal descriptor
+char	ctrlstr[ARB]		# control sequence to be output
+int	afflncnt		# number of lines affected
+int	strlen()
+
+begin
+	call ttywrite (fd, tty, ctrlstr, strlen(ctrlstr), afflncnt)
+end
diff --git a/sys/tty/ttyread.x b/sys/tty/ttyread.x
new file mode 100644
index 00000000..7ead64a3
--- /dev/null
+++ b/sys/tty/ttyread.x
@@ -0,0 +1,102 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+include	<fset.h>
+
+define	PAUSE		20	# pause if no data, msec
+
+
+# TTYREAD -- Read from the terminal in raw mode until sufficient data is
+# accumulated to match the given encoded pattern.  Any additional data read
+# prior to the matched pattern (normally due to type-ahead) is pushed back
+# into the input stream.  If timeout > 0 nonblocking reads are used, and
+# the operation will time out if the pattern is not matched within the given
+# interval in milliseconds.  A valid read returns nchars > 0 indicating the
+# length of the matched pattern; 0 is returned for a timeout and ERR for a
+# garbled read.
+
+int procedure ttyread (fd, tty, outbuf, maxch, patbuf, timeout)
+
+int	fd			# output file
+pointer	tty			# terminal descriptor
+char	outbuf[maxch]		# output data buffer
+int	maxch			# max chars out
+char	patbuf[ARB]		# encoded pattern
+int	timeout			# timeout interval, msec (0 for no timeout)
+
+bool	match
+pointer	sp, ip, op, buf
+int	sv_iomode, iomode, delay, first, last, nchars, ch
+int	fstati(), patmatch(), gpatmatch(), getci(), gstrcpy()
+errchk	getci, unread
+define	abort_ 91
+
+begin
+	call smark (sp)
+	call salloc (buf, SZ_LINE, TY_CHAR)
+
+	# Save raw mode state and set up for nonblocking raw mode reads
+	# if a timeout interval was specified.
+
+	iomode = IO_RAW
+	if (timeout > 0)
+	    iomode = iomode + IO_NDELAY
+
+	sv_iomode = fstati (fd, F_IOMODE)
+	if (sv_iomode != iomode)
+	    call fseti (fd, F_IOMODE, iomode)
+
+	outbuf[1] = EOS
+	match = false
+	nchars = 0
+	delay = 0
+	op = buf
+
+	# Accumulate input characters in nonblocking raw mode until either
+	# the given pattern is matched, or we timeout.
+
+	repeat {
+	    # Read characters until the full sequence has been input or no
+	    # more data is available.
+
+	    while (!match && (op-buf < SZ_LINE) && getci(fd, ch) != EOF) {
+		if (ch==INTCHAR || ch==EOFCHAR || ch == '\r' || ch == '\n') {
+		    nchars = ERR
+		    goto abort_
+		}
+
+		Memc[op] = ch;  op = op + 1
+		Memc[op] = EOS
+		match = (gpatmatch (Memc[buf], patbuf, first, last) > 0)
+
+		if (match) {
+		    ip = buf + first - 1
+		    if (first > 1) {
+			# Put back any input typed before our data block.
+			call unread (fd, Memc[buf], first-1)
+
+			# Redo the match to correct index marks for string
+			# offset.
+			match = (patmatch (Memc[ip], patbuf) > 0)
+		    }
+		    nchars = gstrcpy (Memc[ip], outbuf, maxch)
+		}
+	    }
+
+	    # If the nonblocking read returns EOF, indicating no input was
+	    # queued, wait a bit and try again.
+
+	    if (!match && ch == EOF) {
+		call zwmsec (PAUSE)
+		delay = delay + PAUSE
+	    }
+	} until (match || delay > timeout)
+
+abort_
+	# Restore previous raw mode state.
+	if (sv_iomode != iomode)
+	    call fseti (fd, F_IOMODE, sv_iomode)
+
+	call sfree (sp)
+	return (nchars)
+end
diff --git a/sys/tty/ttyseti.x b/sys/tty/ttyseti.x
new file mode 100644
index 00000000..18493766
--- /dev/null
+++ b/sys/tty/ttyseti.x
@@ -0,0 +1,36 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<chars.h>
+include	<ttyset.h>
+include	"tty.h"
+
+# TTYSETI -- Set a TTY parameter.  Can be used after a ttyodes to override
+# termcap and environment parameters affecting terminal control.
+
+procedure ttyseti (tty, parameter, value)
+
+pointer	tty
+int	parameter, value
+char	parnum[3]
+int	junk, itoc()
+
+begin
+	switch (parameter) {
+	case TTY_PADCHAR:
+	    T_PADCHAR(tty) = value
+	case TTY_TABS:
+	    T_HTOK(tty) = value
+	case TTY_SOTYPE:
+	    T_SOTYPE(tty) = value
+	case TTY_BAUD:
+	    T_BAUD(tty) = value
+	case TTY_NLINES:
+	    T_NLINES(tty) = value
+	case TTY_NCOLS:
+	    T_NCOLS(tty) = value
+	default:
+	    junk = itoc (parameter, parnum, 3)
+	    call syserrs (SYS_TTYSET, parnum)
+	}
+end
diff --git a/sys/tty/ttyso.x b/sys/tty/ttyso.x
new file mode 100644
index 00000000..e03de838
--- /dev/null
+++ b/sys/tty/ttyso.x
@@ -0,0 +1,32 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# TTYSO -- Turn "standout" mode on or off.
+
+procedure ttyso (fd, tty, onflag)
+
+int	fd, onflag
+pointer	tty
+
+char	cap[2]
+bool	ttygetb()
+int	junk, ttyctrl()
+errchk	ttygetb
+
+begin
+	# Select name of capability (so, se, us, ue).  Use so/se if it is
+	# available for the terminal, otherwise try us/ue.
+	if (ttygetb (tty, "so")) {
+	    cap[1] = 's'
+	    cap[2] = 'o'
+	} else {
+	    cap[1] = 'u'
+	    cap[2] = 's'
+	}
+	if (onflag == NO)
+	    cap[2] = 'e'
+	cap[3] = EOS
+
+	# Output the control sequence.  If cap is not available for the
+	# terminal, nothing will be output.
+	junk = ttyctrl (fd, tty, cap, 1)
+end
diff --git a/sys/tty/ttystati.x b/sys/tty/ttystati.x
new file mode 100644
index 00000000..52578fba
--- /dev/null
+++ b/sys/tty/ttystati.x
@@ -0,0 +1,37 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<chars.h>
+include	<ttyset.h>
+include	"tty.h"
+
+# TTYSTATI -- Fetch a TTY parameter.
+
+int procedure ttystati (tty, parameter)
+
+pointer	tty
+int	parameter
+char	parnum[3]
+int	value, junk, itoc()
+
+begin
+	switch (parameter) {
+	case TTY_PADCHAR:
+	    value = T_PADCHAR(tty)
+	case TTY_TABS:
+	    value = T_HTOK(tty)
+	case TTY_SOTYPE:
+	    value = T_SOTYPE(tty)
+	case TTY_BAUD:
+	    value = T_BAUD(tty)
+	case TTY_NLINES:
+	    value = T_NLINES(tty)
+	case TTY_NCOLS:
+	    value = T_NCOLS(tty)
+	default:
+	    junk = itoc (parameter, parnum, 3)
+	    call syserrs (SYS_TTYSTAT, parnum)
+	}
+
+	return (value)
+end
diff --git a/sys/tty/ttysubi.x b/sys/tty/ttysubi.x
new file mode 100644
index 00000000..870dce59
--- /dev/null
+++ b/sys/tty/ttysubi.x
@@ -0,0 +1,194 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<chars.h>
+include	<ctype.h>
+include	"tty.h"
+
+.help ttysubi
+.nf ___________________________________________________________________________
+TTYSUBI -- Argument substitution on a control string.
+
+    Process a capability string containing arguments.  Examples of such
+capability strings are cursor motion to [x,y], and set scrolling region to
+[line1,line2].  Note that arguments in the termcap database are zero-indexed
+by default, while the TTYSUBI arguments are one-indexed.  The control string
+given as input has already been processed to reduce all escape sequences to
+single characters.
+
+Various output formats are supported (some of these are completely off the
+wall, very special case, but that's how termcap does it):
+
+	%d	print decimal integer, zero origin.
+	%2	like %2d.
+	%3	like %3d.
+	%.	put binary value of x,y arg as a character
+	%+x	like %., but add value of char X first
+	%%	print a single %.
+
+The following format codes affect the arguments, but do not directly cause
+any output:
+
+	%>xy	if next arg value > char x add char y.
+	%r	reverses order of arguments.
+	%i	increments arg values by one, for 1 origin.
+	%n	exlusive-or args with 0140B. (DM2500)
+	%B	BCD next arg, (16*(x/10))+(mod(x,10).
+	%D	Reverse coding (x-2*(mod(x,16))). (Delta Data)
+
+We have generalized the termcap formats somewhat to permit a greater range
+of %n formats (%1-%4), as well as %o and %x formats, in case a terminal
+comes along which likes octal or hex numbers.
+
+The %. format causes special problems.  If the terminal requires coordinates
+in binary in the range zero or one to 40B, we can expect problems trying to
+push such chars through the OS driver and any other software (networks, etc.),
+since system software likes to map control characters on output.  To get around
+this we have defined a set of reserved codes which are not to be generated.
+This set is defined in tty.h, and includes newline, tab, etc.  When asked to
+output one of these chars, we output a char with a somewhat larger value
+and return the delta to our caller, which does whatever is appropriate to
+complete the function.
+.endhelp ______________________________________________________________________
+
+int procedure ttysubi (ctrlstr, outstr, maxch, coords, ncoords)
+
+char	ctrlstr[ARB]		# control string containing % formats
+char	outstr[ARB]		# receives processed string
+int	maxch
+int	coords[ncoords]		# on input, coords; on output, deltas
+int	ncoords
+
+bool	reverse			# reverse deltas on output
+int	revstart		# first arg/coord reversed
+int	args[MAX_COORDS]	# processed values of arguments
+int	argnum			# arg being processed
+int	nargs			# number of args (min(MAX_COORDS,ncoords))
+char	driver_chars[NDCHARS]
+char	ch, format_char
+int	i, ip, op, field_width, left, right, temp
+int	stridx(), strlen(), xor()
+data	driver_chars /DRIVER_CHARS/
+errchk	sprintf, pargi
+
+begin
+	# Make a local copy of the arguments to make reversal etc. easy.
+	# Also switch to zero-indexing internally, since the termcap entry
+	# is zero-indexed.
+
+	nargs = min (MAX_COORDS, ncoords)
+	do i = 1, nargs {
+	    args[i] = coords[i] - 1		# make zero-indexed
+	    coords[i] = 0			# init delta
+	}
+	argnum = 1				# output x first by default
+	reverse = false
+
+	op = 1
+	for (ip=1;  ctrlstr[ip] != EOS && op <= maxch;  ip=ip+1) {
+	    ch = ctrlstr[ip]
+
+	    # If normal char, we do not get past this if statement.
+	    if (ch != '%') {
+		outstr[op] = ch
+		op = op + 1
+		next
+	    } else {
+		ip = ip + 1			# fetch format-type char
+		ch = ctrlstr[ip]
+	    }
+
+	    # Get here only if processing a %x format specification.
+	    switch (ch) {
+	    case '%':				# %% --> %
+		outstr[op] = ch
+		op = op + 1
+
+	    case 'd', 'o', 'x', '1', '2', '3', '4':
+		# Output next argument according to the format given.
+		if (IS_DIGIT(ch)) {
+		    field_width = TO_INTEG(ch)
+		    format_char = 'd'
+		} else {
+		    field_width = 0
+		    format_char = ch
+		}
+
+		call sprintf (outstr[op], maxch-op+1, "%0*.0*")
+		    call pargi (field_width)
+		    call pargc (format_char)
+		    call pargi (args[argnum])
+
+		argnum = min (nargs, argnum + 1)
+		op = op + strlen (outstr[op])
+
+	    case '.', '+':
+		# Binary output format.  Coordinate output in binary is a
+		# problem because the OS driver may see a tab, newline, or
+		# whatever and map it into something else.  If the value of
+		# args[argnum] corresponds to a special control character,
+		# we increment it until we have an acceptable value, leaving
+		# it up to our caller to do the rest.
+
+		if (ch == '+') {
+		    ip = ip + 1
+		    args[argnum] = args[argnum] + ctrlstr[ip]
+		}
+
+		repeat {
+		    ch = char (args[argnum])
+		    if (stridx (ch, driver_chars) > 0) {
+			args[argnum] = args[argnum] + 1
+			coords[argnum] = coords[argnum] + 1
+		    } else
+			break
+		}
+
+		outstr[op] = args[argnum]
+		op = op + 1
+		argnum = min (nargs, argnum + 1)
+
+	    # The remaining cases are used to change the values of the
+	    # remaining arguments, and do not cause any output.
+
+	    case '>':					# %>xy
+		if (args[argnum] > ctrlstr[ip+1])
+		    args[argnum] = args[argnum] + ctrlstr[ip+2]
+		ip = ip + 2
+	    case 'r':					# swap remaining args
+		do left = argnum, (nargs - argnum + 1) / 2 {
+		    right = nargs - (left - argnum)
+		    temp = args[left]
+		    args[left] = args[right]
+		    args[right] = temp
+		}
+		reverse = !reverse
+		revstart = argnum
+	    case 'i':					# increment by one
+		do i = argnum, nargs
+		    args[i] = args[i] + 1
+	    case 'n':					# exclusive or with 140B
+		do i = argnum, nargs
+		    args[i] = xor (args[i], 140B)
+	    case 'B':					# BCD encode next arg
+		temp = args[argnum]
+		args[argnum] = 16 * (temp / 10) + mod (temp, 10)
+	    case 'D':					# Reverse code next arg
+		temp = args[argnum]
+		args[argnum] = temp - 2 * mod (temp, 16)
+	    }
+	}
+
+	# If the input coordinates were reversed, we must reverse the
+	# correction deltas, too.
+
+	if (reverse)
+	    do left = revstart, (nargs - revstart + 1) / 2 {
+		right = nargs - (left - revstart)
+		temp = coords[left]
+		coords[left] = coords[right]
+		coords[right] = temp
+	    }
+
+	outstr[op] = EOS
+	return (op - 1)
+end
diff --git a/sys/tty/ttywrite.x b/sys/tty/ttywrite.x
new file mode 100644
index 00000000..3a581523
--- /dev/null
+++ b/sys/tty/ttywrite.x
@@ -0,0 +1,60 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+include	<chars.h>
+include	"tty.h"
+
+# TTYWRITE -- Put a counted control string to the output file.  The control
+# string consists of an optional prefix specifying the delay required, followed
+# by the chars to be sent to the terminal.  If the delay is given as a simple
+# integer number (i.e., ":cl=50\E"), it specifies the delay in milliseconds.
+# If the delay number is followed by an asterisk (i.e., ":cd=3.5*\E^C:") it
+# specifies the delay in milliseconds per line affected by the operation.
+# In the latter case, the AFFLNCNT argument is used to compute the total
+# delay.  Delays are generated by writing a sequence of pad characters
+# (usually NUL); the number of pad chars sent to achieve a particular delay
+# depends on the baud rate.
+
+procedure ttywrite (fd, tty, ctrlstr, nchars, afflncnt)
+
+int	fd			# output file
+pointer	tty			# terminal descriptor
+char	ctrlstr[ARB]		# control sequence to be output
+int	nchars			# nchars in control string
+int	afflncnt		# number of lines affected
+
+double	dval
+int	ip, delay, junk, ch
+int	ctod(), and()
+errchk	putci
+
+begin
+	# Determine number of milliseconds of delay req'd, and position ip
+	# to start of control string.  Do not use CTOD to test whether or not
+	# the string begins with a number, because it is not permissable to
+	# skip whitespace (blank and tab are legal output chars).
+
+	ip = 1
+	if (IS_DIGIT (ctrlstr[ip])) {
+	    junk = ctod (ctrlstr, ip, dval)
+	    if (ctrlstr[ip] == '*') {
+		delay = dval * afflncnt + 0.5
+		ip = ip + 1
+	    } else
+		delay = dval
+	} else
+	    delay = 0
+
+	# Output the control sequence, passing only the first seven bits of
+	# each character.  This is where the \200 escapes get turned into NULs.
+	# Do not use MOD to do the masking because 200B is a negative integer
+	# if CHAR is implemented as 8 bits.
+
+	for (;  ip <= nchars;  ip=ip+1) {
+	    ch = ctrlstr[ip]
+	    call putci (fd, and (ch, 177B))
+	}
+
+	# Add padding if needed to generate delay.
+	call ttydelay (fd, tty, delay)
+end
diff --git a/sys/tty/x_mkttydata.x b/sys/tty/x_mkttydata.x
new file mode 100644
index 00000000..a48cbca8
--- /dev/null
+++ b/sys/tty/x_mkttydata.x
@@ -0,0 +1,367 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<syserr.h>
+include	"tty.h"
+
+task	mkttydata = t_mkttydata
+
+.help mkttydata
+.nf -------------------------------------------------------------------------
+MKTTYDATA -- System Manager's program to compile the TERMCAP entries for a
+list of terminals.  Output is an SPP format include file to be used in TTYLOAD
+to statically declare and initialize the TERMCAP entries for the named
+devices, eliminating the need to scan the TERMCAP file for those devices.
+
+Compilation of selected termcap entries to speed up accesses to the
+termcap database for frequently referenced terminals.  We read and preprocess
+the entries for the named terminals from the termcap file, producing the source
+code for the TTYLOAD procedure as output.  The termcap entry for each device
+is included in the source for TTYLOAD as a static data structure.  TTYLOAD is
+subsequently compiled and placed in the library with the other TTY routines.
+At run time, TTYODES first tries to load the termcap database entry using
+TTYLOAD, and if that fails it goes and reads the termcap file.
+
+N.B.: The TTY interface may be used for any termcap format file, regardless
+of whether or not the database describes terminals.
+.endhelp ---------------------------------------------------------------------
+
+# Tunable parameters.
+
+define	MAX_DEVICES	25		# initial max termcap entries
+define	INC_DEVICES	25		# increment if overflow occurs
+define	SZ_SBUF		4096		# initial size of string buffer
+define	INC_SZSBUF	2048		# increment if overflow occurs
+define	NI_PERLINE	5		# number of datastmt ints per line
+define	NC_PERLINE	8		# number of datastmt chars per line
+
+# Device descriptor structure (contains the extracted termcap entries).
+# There are no upper limits on the number of devices or upon the sizes of
+# any of the substructures.
+
+define	LEN_TCSTRUCT	8
+
+define	TC_NDEVICES	Memi[$1]	# number of termcap entries
+define	TC_MAXDEVICES	Memi[$1+1]	# initial max termcap entries
+define	TC_DEVNAME_P	Memi[$1+2]	# pointer to devname index array
+define	TC_CAPLIST_P	Memi[$1+3]	# pointer to caplist index array
+define	TC_SBUF		Memi[$1+4]	# pointer to string buffer
+define	TC_SZSBUF	Memi[$1+5]	# current size of string buffer
+define	TC_NEXTCH	Memi[$1+6]	# offset of next avail char in sbuf
+define	TC_TCFNAME	Memi[$1+7]	# name of termcap file
+
+define	TC_DEVNAME	Memi[TC_DEVNAME_P($1)+$2-1]
+define	TC_CAPLIST	Memi[TC_CAPLIST_P($1)+$2-1]
+
+# MKTTYDATA -- Given the name of a termcap format file and a list of device
+# names, call TTYOPEN to fetch the termcap entry of the device.
+# Move the entry for the device into the dev structure and continue until
+# the entries for all devices have been read.  Write out the source code for
+# the data structures of these devices.  This output file is "included"
+# when TTYLOAD is later compiled, cacheing the termcap entries for the
+# named devices in memory.
+
+procedure t_mkttydata()
+
+bool	verbose
+int	devlist, fd, ndev, buflen
+pointer	sp, termcap_file, output_file, devname, tc, tty
+bool	clgetb()
+int	clpopnu(), clgfil(), tc_putstr(), open(), tc_dummy_ttyload()
+pointer	ttyopen()
+extern	tc_dummy_ttyload()
+errchk	open, tc_write_data_declarations, clgfil, tc_putstr, malloc, realloc
+
+begin
+	call smark (sp)
+	call salloc (termcap_file, SZ_FNAME, TY_CHAR)
+	call salloc (output_file, SZ_FNAME, TY_CHAR)
+	call salloc (devname, SZ_FNAME, TY_CHAR)
+	call salloc (tc, LEN_TCSTRUCT, TY_STRUCT)
+
+	# Open the list of devices to be compiled into the cache.  CLGFIL is
+	# useful for reading the list even though the list elements are not
+	# filenames, because it can expand comma a delimited list passed as
+	# a string as well as read from a list file.  The list is not sorted
+	# so that the caller can order the devices in the order in which they
+	# will most frequently be referenced (though really it matters little).
+	# Get the names of the input and output files.
+
+	devlist = clpopnu ("devlist")
+	call clgstr ("termcap_file", Memc[termcap_file], SZ_FNAME)
+	call clgstr ("output_file",  Memc[output_file],  SZ_FNAME)
+	verbose = clgetb ("verbose")
+
+	# Initialize the TC descriptor structure. Allocate the variable sized
+	# buffers.
+
+	ndev   = 0
+	buflen = MAX_DEVICES
+
+	TC_NDEVICES(tc)   = 0
+	TC_MAXDEVICES(tc) = MAX_DEVICES
+	TC_SZSBUF(tc)     = SZ_SBUF
+	TC_NEXTCH(tc)     = 0
+
+	iferr {
+	    call malloc (TC_DEVNAME_P(tc), buflen, TY_INT)
+	    call malloc (TC_CAPLIST_P(tc), buflen, TY_INT)
+	    call malloc (TC_SBUF(tc), SZ_SBUF, TY_CHAR)
+	} then
+	    call erract (EA_FATAL)
+
+	# Store the name of the termcap file in the descriptor.  The descriptor
+	# is only valid if TTYLOAD is called with the exact same filename.
+
+	TC_TCFNAME(tc) = tc_putstr (tc, Memc[termcap_file])
+
+	# Fetch the termcap entry for each device in the list.  This is not
+	# done very efficiently, but it does not matter since this program
+	# is infrequently run.  Accumulate the entries in the TC structure.
+
+	while (clgfil (devlist, Memc[devname], SZ_FNAME) != EOF) {
+	    # Fetch entry from termcap file.
+
+	    iferr (tty = ttyopen (Memc[termcap_file], Memc[devname],
+		tc_dummy_ttyload)) {
+
+		call erract (EA_WARN)
+		next
+
+	    } else if (verbose) {
+		call eprintf ("%4d %s: %d chars\n")
+		    call pargi (ndev + 1)
+		    call pargstr (Memc[devname])
+		    call pargi (T_CAPLEN(tty))
+	    }
+
+	    ndev = ndev + 1
+	    TC_NDEVICES(tc) = ndev
+
+	    # Make room for more devices if necessary.
+	    if (ndev > TC_MAXDEVICES(tc)) {
+		TC_MAXDEVICES(tc) = TC_MAXDEVICES(tc) + INC_DEVICES
+		buflen = TC_MAXDEVICES(tc)
+		iferr {
+		    call realloc (TC_DEVNAME_P(tc), buflen, TY_INT)
+		    call realloc (TC_CAPLIST_P(tc), buflen, TY_INT)
+		} then
+		    call erract (EA_FATAL)
+	    }
+
+	    # Add entry to descriptor.
+	    TC_DEVNAME(tc,ndev) = tc_putstr (tc, Memc[devname])
+	    TC_CAPLIST(tc,ndev) = tc_putstr (tc, T_CAPLIST(tty))
+
+	    call ttyclose (tty)
+	}
+
+	call clpcls (devlist)
+
+	# Write the output file (an SPP "include" file) containing data
+	# declarations for the data structures in the TC structure.
+
+	iferr (call delete (Memc[output_file]))
+	    ;
+	fd = open (Memc[output_file], NEW_FILE, TEXT_FILE)
+	call tc_write_data_declarations (fd, tc, Memc[termcap_file])
+	call close (fd)
+
+	call mfree (TC_DEVNAME_P(tc), TY_INT)
+	call mfree (TC_CAPLIST_P(tc), TY_INT)
+	call mfree (TC_SBUF(tc), TY_CHAR)
+	call sfree (sp)
+end
+
+
+# TC_PUTSTR -- Put a string (incl EOS) in the string buffer at nextch.
+# If there is not enough space in the buffer, reallocate a larger buffer.
+# Return the index of the string in the string buffer.
+
+int procedure tc_putstr (tc, str)
+
+pointer	tc
+char	str[ARB]
+int	nextch, nchars, strlen()
+errchk	realloc
+
+begin
+	# Null strings are not stored and cause a null index to be returned.
+	nchars = strlen (str)
+	if (nchars == 0)
+	    return (0)
+
+	nextch = TC_NEXTCH(tc)
+	if (nextch + nchars + 1 > TC_SZSBUF(tc)) {
+	    TC_SZSBUF(tc) = TC_SZSBUF(tc) + INC_SZSBUF
+	    call realloc (TC_SBUF(tc), TC_SZSBUF(tc), TY_CHAR)
+	}
+
+	call strcpy (str, Memc[TC_SBUF(tc) + nextch], ARB)
+	TC_NEXTCH(tc) = nextch + nchars + 1
+
+	return (nextch)
+end
+
+
+# TC_WRITE_DATA_DECLARATIONS -- Write the SPP data declarations required to
+# declare and initialize the following data structures:
+#
+#	int	ndevices	# number of devices in cache
+#	int	devname[]	# 0-indexed offset into sbuf of device name
+#	int	devcaps[]	# 0-indexed offset into sbuf of termcap entry
+#	char	sbuf[]		# string buffer
+
+procedure tc_write_data_declarations (fd, tc, termcap_file)
+
+int	fd			# output file
+pointer	tc			# TC descriptor
+char	termcap_file[ARB]	# name of source file
+
+int	ndevices, dev
+pointer	sbuf
+int	strlen()
+
+begin
+	ndevices = TC_NDEVICES(tc)
+	sbuf = TC_SBUF(tc)
+
+	# Write a comments section naming the devices represented by the
+	# data declarations which follow.
+
+	call fprintf (fd,
+	    "# TERMCAP data declarations for %d devices from '%s'\n")
+	    call pargi (TC_NDEVICES(tc))
+	    call pargstr (termcap_file)
+
+	do dev = 1, ndevices {
+	    call fprintf (fd, "#%15s (size %d+1 chars)\n")
+		call pargstr (Memc[sbuf+TC_DEVNAME(tc,dev)])
+		call pargi (strlen (Memc[sbuf+TC_CAPLIST(tc,dev)]))
+	}
+
+	# Output the object declarations.
+
+	call fprintf (fd, "\n")
+	call fprintf (fd, "int\ttermcap_filename, ndevices, i\n")
+	call fprintf (fd, "int\tdevname[%d], devcaps[%d]\n")
+	    call pargi (ndevices)
+	    call pargi (ndevices)
+	
+	# Do not add 1 char for the EOS; SPP compiler automatically does so.
+	call fprintf (fd, "char\tsbuf[%d]\n")
+	    call pargi (TC_NEXTCH(tc))
+
+	# Output the data initialization declarations.
+
+	call fprintf (fd, "\n")
+	call fprintf (fd, "data\tndevices /%d/\n")
+	    call pargi (ndevices)
+	call fprintf (fd, "data\ttermcap_filename /%d/\n")
+	    call pargi (TC_TCFNAME(tc) + 1)
+
+	call tc_init_datai (fd, "devname", Memi[TC_DEVNAME_P(tc)], ndevices)
+	call tc_init_datai (fd, "devcaps", Memi[TC_CAPLIST_P(tc)], ndevices)
+	call fprintf (fd, "\n")
+	call tc_init_datac (fd, "sbuf",    Memc[TC_SBUF(tc)], TC_NEXTCH(tc)+1)
+end
+
+
+# TC_INIT_DATAI -- Write a series of data statements to initialize an
+# integer array.  A single large statement is not used due to variation
+# in the permissible number of continuation statements permitted by
+# different compilers.
+
+procedure tc_init_datai (fd, varname, array, npix)
+
+int	fd		# output file
+char	varname[ARB]	# name of variable to be initialized
+int	array[npix]	# array values
+int	npix
+
+int	i, j, i1, i2
+
+begin
+	for (j=1;  j <= npix;  j = j + NI_PERLINE) {
+	    i1 = j
+	    i2 = min (j + NI_PERLINE - 1, npix)
+
+	    # Begin new data statement.
+	    call fprintf (fd, "data\t(%s(i),i=%2d,%2d)\t/")
+		call pargstr (varname)
+		call pargi (i1)
+		call pargi (i2)
+
+	    # Output data values.  NOTE: the TC_SBUF offsets are zero-indexed
+	    # offsets into Mem, but the SBUF array in the include file is a
+	    # static Fortran array which requires 1-indexed offsets, so we
+	    # add one before writing out the offsets.
+
+	    for (i=i1;  i <= i2;  i=i+1) {
+		if (i > i1)
+		    call fprintf (fd, ", ")
+		call fprintf (fd, "%d")
+		    call pargi (array[i] + 1)
+	    }
+
+	    # Terminate statement.
+	    call fprintf (fd, "/\n")
+	}
+end
+
+
+# TC_INIT_DATAC -- Write a series of data statements to initialize a
+# char array.  A single large statement is not used due to variation
+# in the permissible number of continuation statements permitted by
+# different compilers.
+
+procedure tc_init_datac (fd, varname, str, nchars)
+
+int	fd			# output file
+char	varname[ARB]		# name of variable to be initialized
+char	str[nchars]		# array values
+int	nchars
+
+int	i, j, i1, i2
+
+begin
+	for (j=1;  j <= nchars;  j = j + NC_PERLINE) {
+	    i1 = j
+	    i2 = min (j + NC_PERLINE - 1, nchars)
+
+	    # Begin new data statement.
+	    call fprintf (fd, "data\t(%s(i),i=%2d,%2d)\t/")
+		call pargstr (varname)
+		call pargi (i1)
+		call pargi (i2)
+
+	    # Output data values.
+	    for (i=i1;  i <= i2;  i=i+1) {
+		if (i > i1)
+		    call fprintf (fd, ", ")
+		call fprintf (fd, "%3d")
+		    call pargc (str[i])
+	    }
+
+	    # Terminate statement.
+	    call fprintf (fd, "/\n")
+	}
+end
+
+
+# TC_DUMMY_TTYLOAD -- Since we are rebuilding a TTYLOAD, we cannot pass
+# a real one to TTYOPEN.  This dummy procedure returns 0 to TTYOPEN for
+# all devices, forcing TTYOPEN to open and scan the termcap file to fetch
+# the termcap entry for a device.
+
+int procedure tc_dummy_ttyload (termcap_file, devname, outstr, maxch)
+
+char	termcap_file[ARB]
+char	devname[ARB]
+char	outstr[maxch]
+int	maxch
+
+begin
+	outstr[1] = EOS
+	return (0)
+end
diff --git a/sys/tty/zzdebug.x b/sys/tty/zzdebug.x
new file mode 100644
index 00000000..f28b1714
--- /dev/null
+++ b/sys/tty/zzdebug.x
@@ -0,0 +1,184 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+include	<ttyset.h>
+include	"tty.h"
+
+# Debug TTY package.
+
+task	find=t_find, cap=t_cap, init=t_init
+
+define	SZ_CAPSTR	30
+define	FAKE_PADCHAR	177B
+
+
+# FIND -- Find an entry in the termcap database, and print out the caplist
+# string.
+
+procedure t_find()
+
+char	ttyname[SZ_FNAME]
+pointer	tty, ttygdes()
+
+begin
+	call clgstr ("ttyname", ttyname, SZ_FNAME)
+	tty = ttygdes (ttyname)
+
+	call printf ("Termcap entry for '%s', %d capabilities\n")
+	    call pargstr (ttyname)
+	    call pargi (T_NCAPS(tty))
+	call printf ("    pc=%oB, bsok=%b, htok=%b, %d by %d, %d baud\n")
+	    call pargi (T_PADCHAR(tty))
+	    call pargi (T_BSOK(tty))
+	    call pargi (T_HTOK(tty))
+	    call pargi (T_NCOLS(tty))
+	    call pargi (T_NLINES(tty))
+	    call pargi (T_BAUD(tty))
+
+	call putline (STDOUT, T_CAPLIST(tty))
+	call putci (STDOUT, '\n')
+	call ttycdes (tty)
+end
+
+
+# CAP -- Open descriptor, then sit in a get/put capability loop.  Capabilities
+# are put to the stdout in a readable form.
+
+procedure t_cap()
+
+char	ttyname[SZ_FNAME], capstr[SZ_CAPSTR]
+char	ctrlstr[SZ_CTRLSTR], tempstr[SZ_CTRLSTR], obuf[SZ_LINE]
+int	fd, args[MAX_COORDS], nargs, nchars
+
+int	stropen(), ttygets(), ttysubi(), clglstr(), strlen(), nscan()
+pointer	tty, ttygdes()
+
+begin
+	call clgstr ("ttyname", ttyname, SZ_FNAME)
+	tty = ttygdes (ttyname)
+	call ttyseti (tty, TTY_PADCHAR, FAKE_PADCHAR)
+
+	call printf ("Termcap entry for '%s', %d capabilities\n")
+	    call pargstr (ttyname)
+	    call pargi (T_NCAPS(tty))
+	call printf ("    pc=%oB, bsok=%b, htok=%b, %d by %d, %d baud\n")
+	    call pargi (T_PADCHAR(tty))
+	    call pargi (T_BSOK(tty))
+	    call pargi (T_HTOK(tty))
+	    call pargi (T_NCOLS(tty))
+	    call pargi (T_NLINES(tty))
+	    call pargi (T_BAUD(tty))
+
+	while (clglstr ("cap", capstr, SZ_CAPSTR) != EOF)
+	    if (ttygets (tty, capstr, ctrlstr, SZ_CTRLSTR) == 0) {
+		call printf ("capability '%s' not found\n")
+		    call pargstr (capstr)
+	    } else {
+		fd = stropen (obuf, SZ_LINE, NEW_FILE)
+
+		# Expand args? (as in "cap: cm 11 4")
+		if (strlen (capstr) > 2) {
+		    call sscan (capstr[3])
+		    for (nargs=0;  nscan() == nargs;  nargs=nargs+1)
+			call gargi (args[nargs+1])
+		    nargs = nargs - 1
+		    call strcpy (ctrlstr, tempstr, SZ_CTRLSTR)
+		    nchars = ttysubi (tempstr, ctrlstr,SZ_CTRLSTR, args,nargs)
+		} else
+		    nargs = 0
+
+		call ttyputs (fd, tty, ctrlstr, 1)
+		if (nargs > 0 && args[1] != 0 || args[2] != 0) {
+		    call fprintf (fd, " residual x=%d, y=%d")
+			call pargi (args[1])
+			call pargi (args[2])
+		}
+		call close (fd)
+		call dump_chars (STDOUT, obuf)
+	    }
+	call putci (STDOUT, '\n')
+		
+	call ttycdes (tty)
+end
+
+
+# INIT -- Output initialization string in human readable form on the standard
+# output.
+
+define	SZ_OBUF		1024
+
+
+procedure t_init()
+
+char	ttyname[SZ_FNAME]
+char	obuf[SZ_OBUF]
+int	fd
+int	stropen()
+pointer	tty, ttygdes()
+
+begin
+	call clgstr ("ttyname", ttyname, SZ_FNAME)
+	tty = ttygdes (ttyname)
+	call ttyseti (tty, TTY_PADCHAR, FAKE_PADCHAR)
+
+	# Print header identifying basic terminal capabilities.
+	call printf ("Termcap entry for '%s', %d capabilities\n")
+	    call pargstr (ttyname)
+	    call pargi (T_NCAPS(tty))
+	call printf ("    pc=%oB, bsok=%b, htok=%b, %d by %d, %d baud\n")
+	    call pargi (T_PADCHAR(tty))
+	    call pargi (T_BSOK(tty))
+	    call pargi (T_HTOK(tty))
+	    call pargi (T_NCOLS(tty))
+	    call pargi (T_NLINES(tty))
+	    call pargi (T_BAUD(tty))
+
+	# Dump initialization string into buffer, print buffer in readable
+	# form on STDOUT.
+
+	fd = stropen (obuf, SZ_OBUF, NEW_FILE)
+	call ttyinit (fd, tty)
+	call close (fd)
+	call dump_chars (STDOUT, obuf)
+	call putci (STDOUT, '\n')
+		
+	call ttycdes (tty)
+end
+
+
+# DUMP_CHARS -- Print out a sequence of normal and control chars in a nice
+# readable form.
+
+procedure dump_chars (fd, str)
+
+int	fd
+char	str[ARB]
+char	ch
+int	ip, iptop
+int	stridx()
+errchk	putci, putline
+
+begin
+	for (ip=1;  str[ip] != EOS;  ) {
+	    if (ip > 1)
+		call putci (fd, '\n')
+	    call putline (fd, "    ")
+	    for (iptop=ip+50;  ip < iptop && str[ip] != EOS;  ip=ip+1) {
+		ch = str[ip]
+		if (IS_CNTRL(ch)) {
+		    if (stridx (ch, "\b\f\t\r\n") > 0)
+			call putcc (fd, ch)
+		    else {
+			call putci (fd, '^')
+			call putci (fd, ch + 'A' - 1)
+		    }
+		} else if (ch == FAKE_PADCHAR) {
+		    call putci (fd, '.')
+		} else
+		    call putc  (fd, ch)
+	    }
+	}
+
+	if (ip < iptop)
+	    call putci (fd, '\n')
+end