f39a2407b6
I uncovered this problem while writing unit tests for GNU troff's delimited expression handling. Plan 9 troff's numeric expression evaluator handles division by zero but not modulus by zero. Fixes: $ echo '.if %0%0% .tm true' | 9 troff Floating point exception (core dumped) $ echo '.if 1%0 .tm true' | 9 troff Floating point exception (core dumped) After this patch: $ echo '.if %0%0% .tm true' | 9 troff x T utf x res 720 1 1 x init troff: modulus by zero.; stdin:1 troff: modulus by zero.; stdin:1 x trailer V0 x stop $ echo '.if 1%0 .tm true' | 9 troff x T utf x res 720 1 1 x init troff: modulus by zero.; stdin:1 x trailer V0 x stop
This is a port of many Plan 9 libraries and programs to Unix.
Installation
To install, run ./INSTALL. It builds mk and then uses mk to run the rest of the installation.
For more details, see install(1), at install.txt in this directory and at https://9fans.github.io/plan9port/man/man1/install.html.
Documentation
See https://9fans.github.io/plan9port/man/ for more documentation. (Documentation is also in this tree, but you need to run a successful install first. After that, "9 man 1 intro".)
Intro(1) contains a list of man pages that describe new features or differences from Plan 9.
Helping out
If you'd like to help out, great!
If you port this code to other architectures, please share your changes so others can benefit.
Git
You can use Git to keep your local copy up-to-date as we make changes and fix bugs. See the git(1) man page here ("9 man git") for details on using Git.
Status
Contact
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Mailing list: https://groups.google.com/group/plan9port-dev
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Issue tracker: https://github.com/9fans/plan9port/issues
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Submitting changes: https://github.com/9fans/plan9port/pulls
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Russ Cox rsc@swtch.com