109 lines
3.6 KiB
Markdown
109 lines
3.6 KiB
Markdown
# The One True Awk
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This is the version of `awk` described in _The AWK Programming Language_,
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by Al Aho, Brian Kernighan, and Peter Weinberger
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(Addison-Wesley, 1988, ISBN 0-201-07981-X).
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## Copyright
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Copyright (C) Lucent Technologies 1997<br/>
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name Lucent Technologies or any of
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its entities not be used in advertising or publicity pertaining
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to distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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## Distribution and Reporting Problems
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Changes, mostly bug fixes and occasional enhancements, are listed
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in `FIXES`. If you distribute this code further, please please please
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distribute `FIXES` with it.
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If you find errors, please report them
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to bwk@cs.princeton.edu.
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Please _also_ open an issue in the GitHub issue tracker, to make
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it easy to track issues.
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Thanks.
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## Submitting Pull Requests
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Pull requests are welcome. Some guidelines:
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* Please do not use functions or facilities that are not standard (e.g.,
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`strlcpy()`, `fpurge()`).
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* Please run the test suite and make sure that your changes pass before
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posting the pull request. To do so:
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1. Save the previous version of `awk` somewhere in your path. Call it `nawk` (for example).
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1. Run `oldawk=nawk make check > check.out 2>&1`.
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1. Search for `BAD` or `error` in the result. In general, look over it manually to make sure there are no errors.
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* Please create the pull request with a request
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to merge into the `staging` branch instead of into the `master` branch.
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This allows us to do testing, and to make any additional edits or changes
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after the merge but before merging to `master`.
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## Building
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The program itself is created by
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make
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which should produce a sequence of messages roughly like this:
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yacc -d awkgram.y
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conflicts: 43 shift/reduce, 85 reduce/reduce
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mv y.tab.c ytab.c
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mv y.tab.h ytab.h
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cc -c ytab.c
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cc -c b.c
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cc -c main.c
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cc -c parse.c
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cc maketab.c -o maketab
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./maketab >proctab.c
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cc -c proctab.c
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cc -c tran.c
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cc -c lib.c
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cc -c run.c
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cc -c lex.c
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cc ytab.o b.o main.o parse.o proctab.o tran.o lib.o run.o lex.o -lm
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This produces an executable `a.out`; you will eventually want to
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move this to some place like `/usr/bin/awk`.
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If your system does not have `yacc` or `bison` (the GNU
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equivalent), you need to install one of them first.
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NOTE: This version uses ANSI C (C 99), as you should also. We have
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compiled this without any changes using `gcc -Wall` and/or local C
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compilers on a variety of systems, but new systems or compilers
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may raise some new complaint; reports of difficulties are
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welcome.
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This compiles without change on Macintosh OS X using `gcc` and
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the standard developer tools.
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The version of `malloc` that comes with some systems is sometimes
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astonishly slow. If `awk` seems slow, you might try fixing that.
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More generally, turning on optimization can significantly improve
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`awk`'s speed, perhaps by 1/3 for highest levels.
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#### Last Updated
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Wed Jan 1 22:44:38 IST 2020
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