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      1 /****************************************************************
      2 Copyright (C) Lucent Technologies 1997
      3 All Rights Reserved
      4 
      5 Permission to use, copy, modify, and distribute this software and
      6 its documentation for any purpose and without fee is hereby
      7 granted, provided that the above copyright notice appear in all
      8 copies and that both that the copyright notice and this
      9 permission notice and warranty disclaimer appear in supporting
     10 documentation, and that the name Lucent Technologies or any of
     11 its entities not be used in advertising or publicity pertaining
     12 to distribution of the software without specific, written prior
     13 permission.
     14 
     15 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
     16 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
     17 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
     18 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
     20 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
     21 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
     22 THIS SOFTWARE.
     23 ****************************************************************/
     24 
     25 This is the version of awk described in "The AWK Programming Language",
     26 by Al Aho, Brian Kernighan, and Peter Weinberger
     27 (Addison-Wesley, 1988, ISBN 0-201-07981-X).
     28 
     29 Changes, mostly bug fixes and occasional enhancements, are listed
     30 in FIXES.  If you distribute this code further, please please please
     31 distribute FIXES with it.  If you find errors, please report them
     32 to bwk@bell-labs.com.  Thanks.
     33 
     34 The program itself is created by
     35 	make
     36 which should produce a sequence of messages roughly like this:
     37 
     38 	yacc -d awkgram.y
     39 
     40 conflicts: 43 shift/reduce, 85 reduce/reduce
     41 	mv y.tab.c ytab.c
     42 	mv y.tab.h ytab.h
     43 	cc -c ytab.c
     44 	cc -c b.c
     45 	cc -c main.c
     46 	cc -c parse.c
     47 	cc maketab.c -o maketab
     48 	./maketab >proctab.c
     49 	cc -c proctab.c
     50 	cc -c tran.c
     51 	cc -c lib.c
     52 	cc -c run.c
     53 	cc -c lex.c
     54 	cc ytab.o b.o main.o parse.o proctab.o tran.o lib.o run.o lex.o -lm
     55 
     56 This produces an executable a.out; you will eventually want to
     57 move this to some place like /usr/bin/awk.
     58 
     59 If your system does not have yacc or bison (the GNU
     60 equivalent), you must compile the pieces manually.  We have
     61 included yacc output in ytab.c and ytab.h, and backup copies in
     62 case you overwrite them.  We have also included a copy of
     63 proctab.c so you do not need to run maketab.
     64 
     65 NOTE: This version uses ANSI C, as you should also.  We have
     66 compiled this without any changes using gcc -Wall and/or local C
     67 compilers on a variety of systems, but new systems or compilers
     68 may raise some new complaint; reports of difficulties are
     69 welcome.
     70 
     71 This also compiles with Visual C++ on all flavors of Windows,
     72 *if* you provide versions of popen and pclose.  The file
     73 missing95.c contains versions that can be used to get started
     74 with, though the underlying support has mysterious properties,
     75 the symptom of which can be truncated pipe output.  Beware.  The
     76 file makefile.win gives hints on how to proceed; if you run
     77 vcvars32.bat, it will set up necessary paths and parameters so
     78 you can subsequently run nmake -f makefile.win.  Beware also that
     79 when running on Windows under command.com, various quoting
     80 conventions are different from Unix systems: single quotes won't
     81 work around arguments, and various characters like % are
     82 interpreted within double quotes.
     83 
     84 This compiles without change on Macintosh OS X using gcc and
     85 the standard developer tools.
     86 
     87 This is also said to compile on Macintosh OS 9 systems, using the
     88 file "buildmac" provided by Dan Allen (danallen (at) microsoft.com),
     89 to whom many thanks.
     90 
     91 The version of malloc that comes with some systems is sometimes
     92 astonishly slow.  If awk seems slow, you might try fixing that.
     93 More generally, turning on optimization can significantly improve
     94 awk's speed, perhaps by 1/3 for highest levels.
     95