* man/roff.man, doc/groff.texinfo: Improve the history part. This

is based on input from Tom Van Vleck <thvv@multicians.org>.


* src/preproc/eqn/sqrt.cpp (sqrt_box::compute_metrics): Assure that
value of `rst' register is not zero, as can happen for the HTML
output device.  Otherwise, there are too many loops, and we get a
stack overflow because of recursion.

1 files changed, 28 insertions, 16 deletions

diff --git a/doc/groff.texinfo b/doc/groff.texinfo
index 767df8ac..e519343e 100644
--- a/doc/groff.texinfo
+++ b/doc/groff.texinfo
@@ -600,24 +600,36 @@ impossible to accomplish complex actions.''  --Doug Gwyn (22/Jun/91 in
 @cindex @code{RUNOFF}, the program
 @cindex @code{rf}, the program
 @code{troff} can trace its origins back to a formatting program called
-@code{RUNOFF}, written by Jerry E.@: Saltzer, which ran on MIT's
-@acronym{CTSS} (@emph{Compatible Time Sharing System}) operating system
-in the mid-sixties.  The name came from the use of the phrase ``run off
-a document'', meaning to print it out.  Bob Morris ported it to the 635
-architecture and called the program @code{roff} (an abbreviation of
-@code{runoff}).  It was rewritten as @code{rf} for the @w{PDP-7} (before
-having @acronym{UNIX}), and at the same time (1969), Doug McIllroy
-rewrote an extended and simplified version of @code{roff} in the
-@acronym{BCPL} programming language.
+@code{RUNOFF}, written by Jerry Saltzer, which ran on the @acronym{CTSS}
+(@emph{Compatible Time Sharing System}, a project of MIT, the
+Massachusetts Institute of Technology) in the
+mid-sixties.@footnote{Jerome H.@: Saltzer, a grad student then, later a
+Professor of Electrical Engineering, now retired.  Saltzer's PhD thesis
+was the first application for @code{RUNOFF} and is available from the
+MIT Libraries.}  The name came from the use of the phrase ``run off a
+document'', meaning to print it out.
+@c
+@c Tom Van Vleck <thvv@multicians.org> writes about the following:
+@c
+@c I am not sure about this.. I think the BCPL runoff was the port to
+@c the 635 architecture, and that the order of events is
+@c 1. CTSS runoff
+@c 2. BCPL runoff on Multics
+@c 3. BCPL runoff on 635
+@c 4. rf on PDP-7
+@c
+Bob Morris ported it to the 635 architecture and called the program
+@code{roff} (an abbreviation of @code{runoff}).  It was rewritten as
+@code{rf} for the @w{PDP-7} (before having @acronym{UNIX}), and at the
+same time (1969), Doug McIllroy rewrote an extended and simplified
+version of @code{roff} in the @acronym{BCPL} programming language.
 
 @cindex @code{roff}, the program
-The first version of @acronym{UNIX} was developed on a @w{PDP-7} which
-was sitting around Bell Labs.  In 1971, the developers wanted to get a
-@w{PDP-11} for further work on the operating system, and to justify the
-cost, proposed the development of a document formatting system for the
-@acronym{AT&T} patents division.  This first formatting program was a
-reimplementation of McIllroy's @code{roff}, written by
-J.@tie{}F.@tie{}Ossanna.
+In 1971, the UNIX developers wanted to get a @w{PDP-11}, and to justify
+the cost, proposed the development of a document formatting system for
+the @acronym{AT&T} patents division.  This first formatting program was
+a reimplementation of McIllroy's @code{roff}, written by J.@tie{}F.@:
+Ossanna.
 
 @cindex @code{nroff}, the program
 When they needed a more flexible language, a new version of @code{roff}