| 1 | Copyright (C) 1992, 1997-2002, 2004-2021 Free Software Foundation, Inc.
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| 2 |
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| 3 | Copying and distribution of this file, with or without modification,
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| 4 | are permitted in any medium without royalty provided the copyright
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| 5 | notice and this notice are preserved.
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| 6 |
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| 7 | Mike Haertel wrote the main program and the dfa and kwset matchers.
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| 8 |
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| 9 | Isamu Hasegawa wrote the POSIX regular expression matcher, which is
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| 10 | part of the GNU C Library and is distributed as part of GNU grep for
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| 11 | use on non-GNU systems. Ulrich Drepper, Paul Eggert, Paolo Bonzini,
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| 12 | Stanislav Brabec, Assaf Gordon, Jakub Jelinek, Jim Meyering, Arnold
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| 13 | Robbins, Andreas Schwab and Florian Weimer also contributed to this
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| 14 | matcher.
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| 15 |
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| 16 | Arthur David Olson contributed the heuristics for finding fixed substrings
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| 17 | at the end of dfa.c.
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| 18 |
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| 19 | Henry Spencer wrote the original test suite from which grep's was derived.
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| 20 | Scott Anderson invented the Khadafy test.
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| 21 |
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| 22 | David MacKenzie wrote the automatic configuration software used to
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| 23 | produce the configure script.
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| 24 |
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| 25 | Authors of the replacements for standard library routines are identified
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| 26 | in the corresponding source files.
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| 27 |
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| 28 | The idea of using Boyer-Moore type algorithms to quickly filter out
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| 29 | non-matching text before calling the regexp matcher was originally due
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| 30 | to James Woods. He also contributed some code to early versions of
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| 31 | GNU grep.
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| 32 |
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| 33 | Mike Haertel would like to thank Andrew Hume for many fascinating
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| 34 | discussions of string searching issues over the years. Hume and
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| 35 | Sunday's excellent paper on fast string searching describes some of
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| 36 | the history of the subject, as well as providing exhaustive
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| 37 | performance analysis of various implementation alternatives.
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| 38 | The inner loop of GNU grep is similar to Hume & Sunday's recommended
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| 39 | "Tuned Boyer Moore" inner loop. See: Hume A, Sunday D.
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| 40 | Fast string searching. Software Pract Exper. 1991;21(11):1221-48.
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| 41 | https://doi.org/10.1002/spe.4380211105
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| 42 |
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| 43 | Arnold Robbins contributed to improve dfa.[ch]. In fact
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| 44 | it came straight from gawk-3.0.3 with small editing and fixes.
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| 45 |
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| 46 | Many folks contributed. See THANKS; if I omitted someone please
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| 47 | send me email.
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| 48 |
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| 49 | Alain Magloire maintained GNU grep until version 2.5e.
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| 50 |
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| 51 | Bernhard "Bero" Rosenkränzer <bero@arklinux.org> maintained GNU grep until
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| 52 | version 2.5.1, ie. from Sep 2001 till 2003.
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| 53 |
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| 54 | Stepan Kasal <kasal@ucw.cz> maintained GNU grep since Feb 2004.
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| 55 |
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| 56 | Tony Abou-Assaleh <taa@acm.org> maintains GNU grep since Oct 2007.
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| 57 |
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| 58 | Jim Meyering <jim@meyering.net> and Paolo Bonzini <bonzini@gnu.org>
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| 59 | began maintaining GNU grep in Nov 2009. Paolo bowed out in 2012.
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| 60 |
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| 61 | ;; Local Variables:
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| 62 | ;; coding: utf-8
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| 63 | ;; End:
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