From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 pkg/system/help/houtput.x | 147 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 pkg/system/help/houtput.x

(limited to 'pkg/system/help/houtput.x')

diff --git a/pkg/system/help/houtput.x b/pkg/system/help/houtput.x
new file mode 100644
index 00000000..499e4292
--- /dev/null
+++ b/pkg/system/help/houtput.x
@@ -0,0 +1,147 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ttyset.h>
+include	<chars.h>
+include	<fset.h>
+include	"help.h"
+
+define	HELP	"[q=quit,d=downhalf,f|sp=downfull,j|cr=downline,N=next]"
+define	QUIT		'q'
+define	FWD_SCREEN	'f'
+define	SCROLL_DOWN	'd'
+define	NEXT_LINE	'j'
+define	NEXT_FILE	'N'
+define	NEXT_FILE_ALT	'n'
+define	REDRAW		'\014'
+
+
+# HOUTPUT -- The help line output procedure.  Count output lines and paginate
+# output if enabled.  If manpage format is desired pass output lines to manpage
+# filter.
+
+procedure houtput (ctrl, lbuf)
+
+pointer	ctrl
+char	lbuf[ARB]
+bool	formfeed, query_enabled
+int	map_cc, maxlines, nlines, ip, cmd
+int	envgeti(), ho_getcmd()
+data	map_cc /YES/
+
+begin
+	if (H_RAWOUT(ctrl) == YES) {
+	    call putline (H_OUT(ctrl), lbuf)
+	    return
+	} else if (H_MANPAGE(ctrl) == YES) {
+	    call man_output (H_OUT(ctrl), lbuf, H_NLPP(ctrl),
+		H_LMARGIN(ctrl), H_RMARGIN(ctrl))
+	    return
+	} else if (H_EOF(ctrl) == YES)
+	    return
+
+	# Check for end of page (either full or formfeed in line)
+	# before processing the output line, because we want to
+	# pause to let the user read the screen before paging.
+
+	ip = 1
+	formfeed = (lbuf[1] == '\f')
+	if (formfeed)
+	    ip = 2
+
+	iferr (maxlines = envgeti ("ttynlines") - 1)
+	    maxlines = 24
+
+	# Help blocks and files are preceded by a form feed and a header.
+	# The "more" query is issued between blocks and files to give the
+	# user a chance to read the previous page before the screen is cleared.
+	# The query is disabled for the first block or file by initialization
+	# of nlines to -1 in the main help routine.
+
+	query_enabled = (H_NLINES(ctrl) > 0)
+	nlines = max (0, H_NLINES(ctrl))
+
+	if (H_PAGINATE(ctrl) == YES) {
+	    if (formfeed || nlines >= maxlines) {
+		if (query_enabled) {
+		    # Pause to give the user a chance to read the output, and
+		    # to indicate whether they wish to continue.
+
+		    repeat {
+			cmd = ho_getcmd (H_TTY(ctrl))
+
+			switch (cmd) {
+			case FWD_SCREEN, BLANK, REDRAW:
+			    nlines = 0
+			case SCROLL_DOWN:
+			    nlines = (maxlines + 1) / 2
+			case NEXT_LINE, CR, LF:
+			    nlines = maxlines - 1
+			case NEXT_FILE, NEXT_FILE_ALT:
+			    H_EOF(ctrl) = YES
+			    nlines = 0
+			case QUIT:
+			    H_QUIT(ctrl) = YES
+			    H_EOF(ctrl) = YES
+			default:
+			    call eprintf ("\07")
+			    call flush (STDERR)
+			    cmd = ERR
+			}
+		    } until (cmd > 0)
+		}
+
+		if (formfeed && H_QUIT(ctrl) == NO) {
+		    call ttyclear (H_OUT(ctrl), H_TTY(ctrl))
+		    nlines = 0
+		}
+	    }
+	}
+
+	# Do not output the line if the user just said to quit.
+	if (H_EOF(ctrl) == NO)
+	    if (lbuf[ip] != EOS) {
+		call ttyputline (H_OUT(ctrl), H_TTY(ctrl), lbuf[ip], map_cc)
+		nlines = nlines + 1
+	    }
+
+	H_NLINES(ctrl) = nlines
+end
+
+
+# HO_GETCMD -- Query the user for a single character command keystroke.
+
+int procedure ho_getcmd (tty)
+
+pointer	tty			# tty descriptor
+
+int	key
+char	strval[1]
+int	clgkey()
+
+begin
+	# Ensure synchronization with the standard output.
+	call flush (STDOUT)
+
+	# Print query in standout mode.
+	call ttyso (STDERR, tty, YES)
+	call eprintf (HELP)
+	call ttyso (STDERR, tty, NO)
+	call flush (STDERR)
+
+	call fseti (STDIN, F_SETREDRAW, REDRAW)
+
+	# Read the command keystroke in raw mode.
+	if (clgkey ("cl.ukey", key, strval, 1) == EOF)
+	    key = QUIT
+	else if (key == INTCHAR)
+	    key = QUIT
+
+	call fseti (STDIN, F_SETREDRAW, 0)
+
+	# Erase the prompt and return.
+	call eprintf ("\r")
+	call ttyclearln (STDERR, tty)
+	call flush (STDERR)
+
+	return (key)
+end
-- 
cgit