Handle ditroff command `Dt' without argument gracefully.

Without this patch, grotty goes into an infinite loop if it tries to
process

  x T utf8
  x res 240 24 40
  x init
  p1
  Dt

* src/libs/libdriver/input.cpp (get_integer_arg): Emit a fatal error
on a non-integer argument, bringing the code into line with the
behaviour documented in the header comment.
(get_possibly_integer_args): Terminate the loop on a non-integer
argument.
(next_arg_begin): Return newline or EOF after emitting the
corresponding error, rather than continuing on to the next line.

1 files changed, 21 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index d4505cce..197b6432 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,24 @@
+2010-05-09  Colin Watson  <cjwatson@debian.org>
+
+	Handle ditroff command `Dt' without argument gracefully.
+
+	Without this patch, grotty goes into an infinite loop if it tries to
+	process
+
+	  x T utf8
+	  x res 240 24 40
+	  x init
+	  p1
+	  Dt
+
+	* src/libs/libdriver/input.cpp (get_integer_arg): Emit a fatal error
+	on a non-integer argument, bringing the code into line with the
+	behaviour documented in the header comment.
+	(get_possibly_integer_args): Terminate the loop on a non-integer
+	argument.
+	(next_arg_begin): Return newline or EOF after emitting the
+	corresponding error, rather than continuing on to the next line.
+
 2010-05-01  Werner LEMBERG  <wl@gnu.org>
 
 	* doc/groff.texinfo: Improve documentation of \R escape.