mandoc: At the end of every tbl(7) cell, clear the \z state.

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
At the end of every tbl(7) cell, clear the \z state.
This is needed because the TERMP_MULTICOL mode is designed such
that term_tbl() buffers all the cells of the table row before the
normal reset logic near the end of term_flushln() can be reached.

This fixes an assertion failure triggered by \z near the end
of a table cell, found by tb@ using afl(1).

Modified Files:
--------------
    mandoc:
        tbl_term.c
    mandoc/regress/tbl/data:
        Makefile

Added Files:
-----------
    mandoc/regress/tbl/data:
        escz.in
        escz.out_ascii
        escz_end.in
        escz_end.out_ascii

Revision Data
-------------
Index: tbl_term.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/tbl_term.c,v
retrieving revision 1.77
retrieving revision 1.78
diff -Ltbl_term.c -Ltbl_term.c -u -p -r1.77 -r1.78
--- tbl_term.c
+++ tbl_term.c
@@ -1,6 +1,6 @@
 /* $Id$ */
 /*
- * Copyright (c) 2011-2021 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2011-2022 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -293,6 +293,7 @@ term_tbl(struct termp *tp, const struct 
 			}
 			tp->tcol++;
 			tp->col = 0;
+			tp->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE);
 			tbl_data(tp, sp->opts, cp, dp, tp->tbl.cols + ic);
 			if (dp != NULL &&
 			    (ic || sp->layout->first->pos != TBL_CELL_SPAN)) {
--- /dev/null
+++ regress/tbl/data/escz_end.in
@@ -0,0 +1,14 @@
+.\" $OpenBSD: escz_end.in,v 1.1 2022/04/26 14:46:30 schwarze Exp $
+.TH TBL-DATA-ESCZ_END 1 "April 26, 2022"
+.SH NAME
+tbl-data-escz_end \- z escape sequence at the end of a tbl(7) cell
+.SH DESCRIPTION
+initial text
+.TS
+tab(:);
+LLL.
+a:b:c
+d\z:e:f
+.TE
+.sp
+final text
Index: Makefile
===================================================================
RCS file: /home/cvs/mandoc/mandoc/regress/tbl/data/Makefile,v
retrieving revision 1.5
retrieving revision 1.6
diff -Lregress/tbl/data/Makefile -Lregress/tbl/data/Makefile -u -p -r1.5 -r1.6
--- regress/tbl/data/Makefile
+++ regress/tbl/data/Makefile
@@ -1,13 +1,16 @@
-# $OpenBSD: Makefile,v 1.5 2019/07/18 14:38:47 schwarze Exp $
+# $OpenBSD: Makefile,v 1.6 2022/04/26 14:46:30 schwarze Exp $
 
 REGRESS_TARGETS	 = blankline block_empty block_unclosed block_width
-REGRESS_TARGETS	+= block_wrap empty insert
+REGRESS_TARGETS	+= block_wrap empty escz escz_end insert
 LINT_TARGETS	 = block_unclosed empty insert
 
-# groff-1.22.3 defect:
+# groff-1.23.0 defects:
 # - When a table ends in the middle of a block,
 #   GNU eqn produces no output whatsoever for the whole table.
+# - When a table cell ends with a no-advance escape sequence,
+#   the next cell is appended to the current cell instead of
+#   aligning it to the next column.
 
-SKIP_GROFF	 = block_unclosed
+SKIP_GROFF	 = block_unclosed escz_end
 
 .include <bsd.regress.mk>
--- /dev/null
+++ regress/tbl/data/escz.out_ascii
@@ -0,0 +1,14 @@
+TBL-DATA-ESCZ(1)            General Commands Manual           TBL-DATA-ESCZ(1)
+
+N\bNA\bAM\bME\bE
+       tbl-data-escz - non-advancing glyph at the end of a tbl(7) cell
+
+D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
+       initial text
+
+       a   b
+       cd  e
+
+       final text
+
+OpenBSD                         April 26, 2022                TBL-DATA-ESCZ(1)
--- /dev/null
+++ regress/tbl/data/escz_end.out_ascii
@@ -0,0 +1,14 @@
+TBL-DATA-ESCZ_END(1)        General Commands Manual       TBL-DATA-ESCZ_END(1)
+
+N\bNA\bAM\bME\bE
+       tbl-data-escz_end - z escape sequence at the end of a tbl(7) cell
+
+D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
+       initial text
+
+       a   b   c
+       d   e   f
+
+       final text
+
+OpenBSD                         April 26, 2022            TBL-DATA-ESCZ_END(1)
--- /dev/null
+++ regress/tbl/data/escz.in
@@ -0,0 +1,14 @@
+.\" $OpenBSD: escz.in,v 1.1 2022/04/26 14:46:30 schwarze Exp $
+.TH TBL-DATA-ESCZ 1 "April 26, 2022"
+.SH NAME
+tbl-data-escz \- non-advancing glyph at the end of a tbl(7) cell
+.SH DESCRIPTION
+initial text
+.TS
+tab(:);
+LL.
+a:b
+c\zd:e
+.TE
+.sp
+final text
--
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