Initial commit

1 files changed, 148 insertions, 0 deletions

diff --git a/sys/tty/ttygdes.x b/sys/tty/ttygdes.x
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--- /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