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diff --git a/pkg/system/help/lroff/input.x b/pkg/system/help/lroff/input.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+include	<chars.h>
+include	"lroff.h"
+
+.help input
+.nf ___________________________________________________________________________
+INPUT -- Read a line of text into the user supplied input buffer.  Convert
+any tabs therein to spaces to simplify further processing.  If generation
+of standout mode control chars is enabled, map "\f[BIR]" sequences into the
+appropriate control chars (defined in <chars.h>), otherwise delete any such
+sequences found (these control chars are later mapped by HELP, PAGE, LPRINT
+etc. into whatever sequence the actual output device requires).  Return the
+number of PRINTABLE chars in the input line.  Control characters are not
+counted, but are copied to the output line.  The trailing newline is stripped;
+Lroff deals mainly with words, not lines.  Only printable characters are made
+to "stand out", i.e., standout mode is always turned off between words and at
+the end of a line.
+.endhelp ______________________________________________________________________
+
+int procedure input (in, userbuf)
+
+extern	in()
+char	userbuf[ARB]
+
+bool	standout_mode_in_effect
+char	ch
+int	len_inputline, ocol
+pointer	sp, lbuf, ip, op
+int	stridx(), in()
+errchk	salloc, in
+include	"lroff.com"
+
+begin
+	call smark (sp)
+	call salloc (lbuf, SZ_IBUF, TY_CHAR)
+
+	# Get input line and deal with any tab characters therein.
+	if (in (in_magic_arg, Memc[lbuf]) == EOF) {
+	    call sfree (sp)
+	    return (EOF)
+	}
+
+	standout_mode_in_effect = false
+	len_inputline = 0
+	ip = lbuf
+	op = 1
+	ocol = 0
+
+	# Process the input buffer, converting any "\f?" font escape sequences
+	# found.  Terminate when newline is reached.  Delete the newline.
+	# Expand all tabs.
+
+	for (ch=Memc[ip];  ch != '\n' && ch != EOS;  ch=Memc[ip]) {
+	    if (ch == '\\')
+		if (Memc[ip+1] == 'f' && stridx (Memc[ip+2], "BIR") > 0) {
+		    # Turn standout mode on or off.  Can only be turned on
+		    # if "soflag" is YES.
+		    switch (Memc[ip+2]) {
+		    case 'B', 'I':			# bold, italic
+			if (soflag == YES)
+			    standout_mode_enabled = true
+		    case 'R':				# roman
+			if (standout_mode_in_effect) {
+			    userbuf[op] = SO_OFF
+			    op = op + 1
+			    standout_mode_in_effect = false
+			}
+			standout_mode_enabled = false
+		    }
+		    ip = ip + 3				# \f? = 3
+		    next
+		}
+
+	    # Only make alphanumeric chars "stand out".
+
+	    if (IS_ALNUM(ch)) {
+		len_inputline = len_inputline + 1
+		ocol = ocol + 1
+		if (standout_mode_enabled && !standout_mode_in_effect) {
+		    userbuf[op] = SO_ON
+		    op = op + 1
+		    standout_mode_in_effect = true
+		}
+
+	    } else if (ch == '\t') {
+		repeat {
+		    userbuf[op] = ' '
+		    op = op + 1
+		    ocol = ocol + 1
+		    len_inputline = len_inputline + 1
+		} until (ocol > 1 && mod (ocol, TABSIZE) == 0)
+		ip = ip + 1
+		next
+
+	    } else {
+		if (IS_PRINT(ch)) {
+		    len_inputline = len_inputline + 1
+		    ocol = ocol + 1
+		}
+		if (standout_mode_in_effect) {
+		    userbuf[op] = SO_OFF
+		    op = op + 1
+		    standout_mode_in_effect = false
+		}
+	    }
+
+	    userbuf[op] = ch
+	    op = op + 1
+	    ip = ip + 1
+	}
+
+	if (standout_mode_in_effect) {
+	    userbuf[op] = SO_OFF
+	    op = op + 1
+	    standout_mode_in_effect = false
+	}
+	userbuf[op] = EOS
+
+	call sfree (sp)
+	return (len_inputline)
+end