test font modifiers in the layout; related to tbl_html.c rev. 1.29

Ignore unreasonably large spacing modifiers in tbl layouts.

Jan Schreiber <jes at posteo dot de> ran afl on mandoc and it turned
out mandoc tried to use spacing modifiers so large that they would
trigger assertion failures in term_ascii.c, function locale_advance().

test tbl_term.c rev. 1.61 and tbl_data.c rev. 1.40:
incomplete short layout lines followed by longer lines,
and spans at the beginning of layout lines

When all cells in a tbl(1) column are empty, set the column width
to 1n rather than to 0n, in the same way as groff does.
This fixes misformatting reported by bentley@ in xkeyboard-config(7).

Do not access a NULL pointer if a table contains a horizontal line
next to a table line having fewer columns than the table as a whole.
Bug found by Stephen Gregoratto <dev at sgregoratto dot me>
with aerc-config(5).

Multiple tbl(7) improvements:
* Do not discard data that lacks a matching layout cell but remains
within the number of columns of the table as a whole.
* Do not insert dummy data rows for any layout row starting with a
horizontal line, but only for layout rows that would discard all
the data on a matching non-empty data row.
* Print horizontal lines specified in the layout even if there is
no matching data cell.
* Improve the logic for extending vertical lines to adjacent rows,
for choosing cross marks versus line segments, and some related details.

Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.

branches: 1.1.1;
Initial revision

Ignore unreasonably large spacing modifiers in tbl layouts.

Jan Schreiber <jes at posteo dot de> ran afl on mandoc and it turned
out mandoc tried to use spacing modifiers so large that they would
trigger assertion failures in term_ascii.c, function locale_advance().

test tbl_term.c rev. 1.61 and tbl_data.c rev. 1.40:
incomplete short layout lines followed by longer lines,
and spans at the beginning of layout lines

When all cells in a tbl(1) column are empty, set the column width
to 1n rather than to 0n, in the same way as groff does.
This fixes misformatting reported by bentley@ in xkeyboard-config(7).

Do not access a NULL pointer if a table contains a horizontal line
next to a table line having fewer columns than the table as a whole.
Bug found by Stephen Gregoratto <dev at sgregoratto dot me>
with aerc-config(5).

Multiple tbl(7) improvements:
* Do not discard data that lacks a matching layout cell but remains
within the number of columns of the table as a whole.
* Do not insert dummy data rows for any layout row starting with a
horizontal line, but only for layout rows that would discard all
the data on a matching non-empty data row.
* Print horizontal lines specified in the layout even if there is
no matching data cell.
* Improve the logic for extending vertical lines to adjacent rows,
for choosing cross marks versus line segments, and some related details.

Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.

branches: 1.1.1;
Initial revision

test tbl_term.c rev. 1.61 and tbl_data.c rev. 1.40:
incomplete short layout lines followed by longer lines,
and spans at the beginning of layout lines

When all cells in a tbl(1) column are empty, set the column width
to 1n rather than to 0n, in the same way as groff does.
This fixes misformatting reported by bentley@ in xkeyboard-config(7).

Do not access a NULL pointer if a table contains a horizontal line
next to a table line having fewer columns than the table as a whole.
Bug found by Stephen Gregoratto <dev at sgregoratto dot me>
with aerc-config(5).

Multiple tbl(7) improvements:
* Do not discard data that lacks a matching layout cell but remains
within the number of columns of the table as a whole.
* Do not insert dummy data rows for any layout row starting with a
horizontal line, but only for layout rows that would discard all
the data on a matching non-empty data row.
* Print horizontal lines specified in the layout even if there is
no matching data cell.
* Improve the logic for extending vertical lines to adjacent rows,
for choosing cross marks versus line segments, and some related details.

Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.

branches: 1.1.1;
Initial revision

When all cells in a tbl(1) column are empty, set the column width
to 1n rather than to 0n, in the same way as groff does.
This fixes misformatting reported by bentley@ in xkeyboard-config(7).

Do not access a NULL pointer if a table contains a horizontal line
next to a table line having fewer columns than the table as a whole.
Bug found by Stephen Gregoratto <dev at sgregoratto dot me>
with aerc-config(5).

Multiple tbl(7) improvements:
* Do not discard data that lacks a matching layout cell but remains
within the number of columns of the table as a whole.
* Do not insert dummy data rows for any layout row starting with a
horizontal line, but only for layout rows that would discard all
the data on a matching non-empty data row.
* Print horizontal lines specified in the layout even if there is
no matching data cell.
* Improve the logic for extending vertical lines to adjacent rows,
for choosing cross marks versus line segments, and some related details.

Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.

branches: 1.1.1;
Initial revision

Do not access a NULL pointer if a table contains a horizontal line
next to a table line having fewer columns than the table as a whole.
Bug found by Stephen Gregoratto <dev at sgregoratto dot me>
with aerc-config(5).

Multiple tbl(7) improvements:
* Do not discard data that lacks a matching layout cell but remains
within the number of columns of the table as a whole.
* Do not insert dummy data rows for any layout row starting with a
horizontal line, but only for layout rows that would discard all
the data on a matching non-empty data row.
* Print horizontal lines specified in the layout even if there is
no matching data cell.
* Improve the logic for extending vertical lines to adjacent rows,
for choosing cross marks versus line segments, and some related details.

Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.

branches: 1.1.1;
Initial revision

Multiple tbl(7) improvements:
* Do not discard data that lacks a matching layout cell but remains
within the number of columns of the table as a whole.
* Do not insert dummy data rows for any layout row starting with a
horizontal line, but only for layout rows that would discard all
the data on a matching non-empty data row.
* Print horizontal lines specified in the layout even if there is
no matching data cell.
* Improve the logic for extending vertical lines to adjacent rows,
for choosing cross marks versus line segments, and some related details.

Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.

branches: 1.1.1;
Initial revision