Adds most of the toolsHEADmaster

1 files changed, 2486 insertions, 0 deletions

diff --git a/coreutils-5.3.0-bin/contrib/gawk/3.1.6/gawk-3.1.6-src/NEWS b/coreutils-5.3.0-bin/contrib/gawk/3.1.6/gawk-3.1.6-src/NEWS
new file mode 100644
index 0000000..a0ba8db
--- /dev/null
+++ b/coreutils-5.3.0-bin/contrib/gawk/3.1.6/gawk-3.1.6-src/NEWS
@@ -0,0 +1,2486 @@
+   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006, 2007 Free Software Foundation, Inc.
+   
+   Copying and distribution of this file, with or without modification,
+   are permitted in any medium without royalty provided the copyright
+   notice and this notice are preserved.
+ 
+Changes from 3.1.5 to 3.1.6
+---------------------------
+
+1. `gawk 'program' /non/existant/file' no longer core dumps.
+
+2. Too many people the world over have complained about gawk's use of the
+   locale's decimal point for parsing input data instead of the traditional
+   period.  So, even though gawk was being nicely standards-compliant, in
+   a Triumph For The Users, gawk now only uses the locale's decimal point
+   if --posix is supplied or if POSIXLY_CORRECT is set.  It is the sincere
+   hope that this change will eliminate this FAQ from being asked.
+
+3. `gawk -v BINMODE=1 ...' works again.
+
+4. Internal file names like `/dev/user' now work again. (Note that these
+   file names are obsolete and will go away eventually.)
+
+5. Problems with wide strings in non "C" locales have been straightened
+   out everywhere.  (At least, we think so.)
+
+6. Use of `ansi2knr' is no longer supported. Please use an ANSI C compiler.
+
+7. Updated to Autoconf 2.61, Automake 1.10, and Gettext 0.16.1.
+
+8. The getopt* and regex* files were synchronized with current GLIBC CVS.
+   See the ChangeLog for the versions and minor edits made.
+
+9. There are additional --lint-old warnings.
+
+10. Gawk now uses getaddrinfo(3) to look up names and IP addresses. This
+    allows the use of an IPv6 format address and paves the way for
+    eventual addition of `/inet6/...' and `/inet4/...' hostnames.
+
+11. We believe gawk to now be valgrind clean. At least when run against
+    the test suite.
+
+12. A number of issues dealing with the formatting and printing of very
+    large numbers in integer formats have been dealt with and fixed.
+
+13. Gawk now converts "+inf", "-inf", "+nan" and "-nan" into the corresponding
+    magic IEEE floating point values. Only those strings (case independent)
+    work.  With --posix, gawk calls the system strtod directly. You asked
+    for it, you got it, you deal with it.
+
+14. Defining YYDEBUG enables the -D command line option.
+
+15. Gawk should now work out of the box on Tandem NSK/OSS systems.
+
+16. Lint messages rationalized: many more of the messages are now printed
+    only once, instead of every time they are encountered.
+
+17. The strftime() function now accepts an optional third argument, which
+    if non-zero or non-null, indicates that the time should be formatted
+    as UTC instead of as local time.
+
+18. The precedence of concatenation and `| getline' (in something like
+    "echo " "date" | getline stuff) has been reverted to the earlier
+    behavior and now once again matches Unix awk.
+
+19. New configure time flag --disable-directories-fatal which causes
+    gawk to silently skip directories on the command line.  This behavior
+    is also enabled for --traditional, since it's what Unix awk does.
+
+20. A new option, --use-lc-numeric, forces use of the locale's decimal
+    point without the rest of the draconian restrictions imposed by
+    --posix. This softens somewhat the stance taken in item #2.
+
+21. Everything relevant has been updated to the GPL 3.
+
+22. Array growth should be faster now, at no cost in space.
+
+23. Lots more tests.
+
+24. One new translation.
+
+25. Various bugs fixed, see the ChangeLog for details.
+
+Changes from 3.1.4 to 3.1.5
+---------------------------
+
+1. The random() suite has been updated to a current FreeBSD version, which
+   works on systems with > 32-bit ints.
+
+2. A new option, `--exec' has been added. It's like -f but ends option
+   processing.  It also disables `x=y' variable assignments, but not -v.
+   It's needed mainly for CGI scripts, so that source code can't be
+   passed in as part of the URL.
+
+3. dfa.[ch] have been synced with GNU grep development.  This also fixes
+   multiple regex matching problems in multibyte locales.
+
+4. Updated to Automake 1.9.5.
+
+5. Updated to Bison 2.0.
+
+6. The getopt* and regex* files were synchronized with current GLIBC CVS.
+   See the ChangeLog for the versions and minor edits made.
+
+7. `configure --disable-nls' now disables just gawk's own translations.
+   Gawk continues to work with the locale's numeric formatting.  This
+   includes a bug fix in handling the printf ' flag (e.g., %'d).
+
+8. Gawk is now multibyte aware.  This means that index(), length(),
+   substr() and match() all work in terms of characters, not bytes.
+
+9. Gawk is now smarter about parsing numeric constants in corner cases.
+
+11. Not closing open redirections no longer causes gawk to exit non-zero.
+
+10. The VMS port has been updated.
+
+11. Changes from Andrew Schorr at the xmlgawk project to provide for
+    open hooks from extensions are now included.  This will let the
+    xmlgawk extension work in the standard gawk.
+
+12. Updated to gettext 0.14.4. Gawk no longer includes its own copy
+    of the gettext `intl' library, following current GNU practice to
+    rely on there being an external version thereof.
+
+13. A regexp of the form `//' will now generate a warning that it
+    is not a C++ comment from --lint (awk.y).
+
+14. The ^ and ^= operators with an integer exponent now use Exponentiation
+    by Squaring. This simultaneously fixes a problem with ^= and a negative
+    integer exponent.
+
+15. length(array) now returns the number of elements in the array.  This is
+    is a non-standard extension that will fail in POSIX mode.
+
+16. Carriage return characters are now ignored in program source code.
+
+17. Four new translations added.
+
+18. Various minor bugs fixed. See the ChangeLog for the details.
+
+Changes from 3.1.3 to 3.1.4
+---------------------------
+
+1. Gawk now supports the POSIX %F format, falling back to %f if the local
+   system printf doesn't handle it.
+
+2. Gawk now supports the ' flag in printf. E.g., %'d in a locale with thousands
+   separators includes the thousands separator in the value, e.g. 12,345.
+
+   This has one problem; the ' flag is next to impossible to use on the
+   command line, without major quoting games.  Oh well, TANSTAAFL.
+
+3. The dfa code has been reinstated; the performance degradation was
+   just too awful.  Sigh.  (For fun, use `export GAWK_NO_DFA=1' to
+   see the difference.)
+
+4. The special case `x = x y' is now recognized in the grammar, and gawk
+   now uses `realloc' to append the new value to the end of the existing
+   one.  This can speed up the common case of appending onto a string.
+
+5. The dfa code was upgraded with most of the fixes from grep 2.5.1, and
+   the regex code was upgraded with GLIBC as mid-January 2004.  The regex
+   code is faster than it was, but still not as fast as the dfa code, so
+   the dfa code stays in.  The getopt code was also synced to current GLIBC.
+
+6. Support code upgraded to Automake 1.8.5, Autoconf 2.59, and gettext 0.14.1.
+
+7. When --posix is in effect, sub/gsub now follow the 2001 POSIX behavior.
+   Yippee.  This is even documented in the manual.
+
+8. Gawk will now recover children that have died (input pipelines, two-way
+   pipes), upon detecting EOF from them, thus avoiding filling
+   up the process table.  Open file descriptors are not recovered
+   (unfortunately), since that could break awk semantics.  See the
+   ChangeLog and the source code for the details.
+
+9. Handling of numbers like `0,1' in non-American locales ought to
+   work correctly now.
+
+10. IGNORECASE is now locale-aware for characters with values above 128.
+    The dfa matcher is now used for IGNORECASE matches too.
+
+11. Dynamic function loading is better. The documentation has been improved
+    and some new APIs for use by dynamic functions have been added.
+
+12. Gawk now has a fighting chance of working on older systems,
+    a la SunOS 4.1.x.
+
+13. Issues with multibyte support on HP-UX are now resolved. `configure' now
+    disables such support there, since it's not up to what gawk needs.
+
+14. There are now even more tests in the test suite.
+
+15. Various bugs fixed; see ChangeLog for the details.
+
+Changes from 3.1.2 to 3.1.3
+---------------------------
+
+1. Gawk now follows POSIX in handling of local numeric formats for
+   input, output and number/string conversions.
+
+2. Multibyte detection improved.  See README_d/README.multibyte for more
+   info about multibyte locales.
+
+3. Handling of `close' made more POSIX-compliant for POSIXLY_CORRECT,
+   see the documentation.
+
+4. The record reading code was redone, again.  This time it's much
+   better. Really!
+
+5. For RS = "\n" and RS = "", gawk now only sets RT when it has changed.
+   This provides considerable performance improvement.
+
+6. `match' now sets all the subscripts in the third argument array
+   correctly, even if not all subexpressions matched.
+
+7. Updated to Automake 1.7.5.  configure.in renamed configure.ac.
+
+8. C-style switch statements are available, but must be enabled at
+   compile time via `configure --enable-switch'.  For 3.2 they'll be
+   enabled by default. Thanks to Michael Benzinger for the initial
+   code.
+
+9. %c now always prints no more than one character, whatever
+   precision is provided.
+
+10. strtonum(<number>) now works again.
+
+11. Gawk is now much better about scalar/array typing of global
+    uninitiailzed variables passed as parameters. Once the parameter
+    is then used one way or the other, the global var's type is
+    adjusted accordingly.  Thanks to Stepan Kasal for the original
+    (considerable) changes.
+
+12. Dynamic function loading under Windows32 should now be possible. See
+    README_d/README.pcdynamic. Thanks to Patrick T.J. McPhee for the changes.
+
+13. Updated to gettext 0.12.1.
+
+14. Gawk now follows historical practice and POSIX for the return
+    value of `rand': It's now  0 <= N < 1.
+
+Changes from 3.1.1 to 3.1.2
+---------------------------
+
+1. Loops of the form:
+
+	for (iggy in foo)
+		next
+
+   no longer leak memory.
+
+2. gawk -v FIELDWIDTHS="..." now sets PROCINFO["FS"] correctly.
+
+3. All builtin operations and functions should now fully evaluate their
+   arguments so that side effects take place correctly.
+
+4. Fixed a logic bug in gsub/gensub for matches to null strings that occurred
+   later in the string after a nonnull match.
+
+5. getgroups code now works on Ultrix again.
+
+6. Completely new version of the full GNU regex engine now in place.
+
+7. Argument parsing and variable assignment has been cleaned up.
+
+8. An I/O bug on HP-UX has been documented and worked around. See
+   README_d/README.hpux.
+
+9. awklib/grcat should now compile correctly.
+
+10. Updated to automake 1.7.3, autoconf 2.57 and gettext 0.11.5 ; thanks to
+    Paul Eggert for the initial automake and autoconf work.
+
+11. As a result of #6, removed the use of the dfa code from GNU grep.
+
+12. It is now possible to use ptys for |& two-way pipes instead of
+    pipes.  The basic plumbing for this was provided by Paolo Bonzini.
+    To make this happen:
+
+    	command = "unix command etc"
+	PROCINFO[command, "pty"] = 1
+
+	print ... |& command
+	command |& getline stuff
+
+    In other words, set the element in PROCINFO *before* opening the
+    two-way pipe, and then gawk will use ptys instead of pipes.
+
+    On systems without ptys or where all the ptys are in use, gawk
+    will fall back to using plain pipes.
+
+13. Fixed a regex matching across buffer boundaries bug, with a
+    heuristic.  See io.c:rsre_get_a_record.
+
+14. Profiling no longer dumps core if there are extension functions in place.
+
+15. Grammar and scanner cleaned up, courtesy of Stepen Kasal, to hopefully
+    once and for all fix the `/=' operator vs. `/=.../' regex ambiguity.
+    Lots of other grammar simplifications applied, as well.
+
+16. BINMODE should work now on more Windows ports.
+
+17. Updated to bison 1.875.  Includes fix to bisonfix.sed script.
+
+18. The NODE structure is now 20% (8 bytes) smaller (on x86, anyway), which
+    should help conserve memory.
+
+19. Builds not in the source directory should work again.
+
+20. Arrays now use 2 NODE's per element instead of three. Combined with
+    #18, (on the x86) this reduces the overhead from 120 bytes per element
+    to just 64 bytes: almost a 50% improvement.
+
+21. Programs that make heavy use of changing IGNORECASE should now be
+    much faster, particularly if using a regular expression for FS or RS.
+    IGNORECASE now correctly affects RS regex record splitting, as well.
+
+22. IGNORECASE no longer affects single-character field splitting (FS = "c"),
+    or single-character record splitting (RS = "c").
+
+    This cleans up some weird behavior, and makes gawk better match the
+    documentation, which says it only affects regex-based field splitting
+    and record splitting.
+
+    The documentation on this was improved, too.
+
+23. The framework in test/ has been simplified, making it much easier to
+    add new tests while keeping the size of Makefile.am reasonable. Thanks
+    for this to Stepan Kasal.
+
+24. --lint=invalid causes lint warnings only about stuff that's actually
+    invalid.  This needs additional work.
+
+25. More translations.
+
+26. The `get_a_record' routine has been revamped (currently by splitting it
+    into three variants).  This should improve long-term maintainability.
+
+27. `match' now adds more entries to 3rd array arg:
+	match("the big dog", /([a-z]+) ([a-z]+) ([a-z]+)/, data)
+    fills in variables:
+    	data[1, "start"], data[1, "length"], and so on.
+
+28. New `asorti' function with same interface as `asort', but sorts indices
+    instead of values.  
+
+29. Documentation updated to FDL 1.2.
+
+30. New `configure' option --disable-lint at compile time disables lint
+    checking.  With GCC dead-code-elimination, cuts almost 200K off the
+    executable size on GNU/Linux x86.  Presumably speeds up runtime.
+
+    Using this will cause some of the tests in the test suite to fail.
+    This option may be removed at a later date.
+
+31. Various minor cleanups, see the ChangeLog for details.
+
+Changes from 3.1.0 to 3.1.1
+---------------------------
+
+1. Six new translations.
+
+2. Having more than 4 different values for OFMT and/or CONVFMT now works.
+
+3. The handling of dynamic regexes is now more more sane, esp. w.r.t.
+   the profiling code.  The profiling code has been fixed in several
+   places.
+
+4. The return value of index("", "") is now 1.
+
+5. Gawk should no longer close fd 0 in child processes.
+
+6. Fixed test for strtod semantics and regenerated configure.
+
+7. Gawk can now be built with byacc; an accidental bison dependency was
+   removed.
+
+8. `yyerror' will no longer dump core on long source lines.
+
+9. Gawk now correctly queries getgroups(2) to figure out how many groups
+   the process has.
+
+10. New configure option to force use of included strftime, e.g. on
+    Solaris systems. See `./configure --help' for the details. Replaced
+    the included strftime.c with the one from textutils.
+
+11. OS/2 port has been updated.
+
+12. Multi-byte character support has been added, courtesy of IBM Japan.
+
+13. The `for (iggy in foo) delete foo[iggy]' -> `delete foo' optimisation
+    now works.
+
+14. Upgraded to gettext 0.11.2 and automake 1.5.
+
+15. Full gettext compatibility (new dcngettext function).
+
+16. The O'Reilly copyedits and indexing changes for the documentation have
+    been folded into the texinfo version of the manuals.
+
+17. A humongously long value for the AWKPATH environment variable will no
+    longer dump core.
+
+18. Configuration / Installation issues have been straightened out in
+    Makefile.am.
+
+Changes from 3.0.6 to 3.1.0
+---------------------------
+
+1. A new PROCINFO array provides info about the process. The non-I/O /dev/xxx
+   files are now obsolete, and their use always generates a warning.
+
+2. A new `mktime' builtin function was added for creating time stamps. The
+   `mktime' function written in awk was removed from the user's guide.
+
+3. New `--gen-po' option creates GNU gettext .po files for strings marked
+   with a leading underscore.
+
+4. Gawk now completely interprets special file names internally, ignoring the
+   existence of real /dev/stdin, /dev/stdout files, etc.
+
+5. The mmap code was removed. It was a worthwhile experiment that just
+   didn't work out.
+
+6. The BINMODE variable is new; on non-UNIX systems it affects how gawk
+   opens files for text vs. binary.
+
+7. The atari port is now unsupported.
+
+8. Gawk no longer supports `next file' as two words.
+
+9. On systems that support it, gawk now sets the `close on exec' flag on all
+   files and pipes it opens. This makes sure that child processes run via
+   `system' or pipes have plenty of file descriptors available.
+
+10. New ports: Tandem and BeOS.  The Tandem port is unsupported.
+
+11. If `--posix' is in effect, newlines are not allowed after ?:.
+
+12. Weird OFMT/CONVFMT formats no longer cause fatal errors.
+
+13. Diagnostics about array parameters now include the parameter's name,
+    not just its number.
+
+14. configure should now automatically add -D_SYSV3 for ISC Unix.
+    (This seems to have made it into the gawk 3.0.x line long ago.)
+
+15. It is now possible to open a two-way pipe via the `|&' operator.
+    See the discussion in the manual about putting `sort' into such a pipeline,
+    though.  (NOTE!  This is borrowed from ksh: it is not the same as
+    the same operator in csh!)
+
+16. The `close' function now takes an optional second string argument
+    that allows closing one or the other end of the two-way pipe to
+    a co-process.  This is needed to use `sort' in a co-process, see
+    the doc.
+
+17. If TCP/IP is available, special file names beginning with `/inet'
+    can be used with `|&' for IPC. Thanks to Juergen Kahrs for the initial
+    code.
+
+18. With `--enable-portals' on the configure command line, gawk will also
+    treat file names that start with `/p/' as a 4.4 BSD type portal file,
+    i.e., a two-way pipe for `|&'.
+
+19. Unrecognized escapes, such as "\q" now always generate a warning.
+
+20. The LINT variable is new; it provides dynamic control over the --lint
+    option.
+
+21. Lint warnings can be made fatal by using --lint=fatal or `LINT = "fatal"'.
+    Use this if you're really serious about portable code.
+
+22. Due to an enhanced sed script, there is no longer any need to worry
+    about finding or using alloca.  alloca.c is thus now gone.
+
+23. A number of lint warnings have been added.  Most notably, gawk will
+    detect if a variable is used before assigned to.  Warnings for
+    when a string that isn't a number gets converted to a number are
+    in the code but disabled; they seem to be too picky in practice.
+
+    Also, gawk will now warn about function parameter names that shadow
+    global variable names.
+
+24. It is now possible to dynamically add builtin functions on systems
+    that support dlopen. This facility is not (yet) as portable or well
+    integrated as it might be.  *** WARNING *** THIS FEATURE WILL EVOLVE!
+
+25. There are *many* new tests in the test suite.
+
+26. Profiling has been added!  A separate version of gawk, named pgawk, is
+    built and generates a run-time execution profile.  The --profile option
+    can be used to change the default output file.   In regular gawk, this
+    option pretty-prints the parse tree.
+
+27. Gawk has been internationalized, using GNU gettext.  Translations for
+    future distributions are most welcome.  Simultaneously, gawk was switched
+    over to using automake.  You need Automake 1.4a (from the CVS archive)
+    if you want to muck with the Makefile.am files.
+
+28. New `asort' function for sorting arrays.  See the doc for details.
+
+29. The match function takes an optional array third argument to hold
+    the text matched by parenthesized sub-expressions.
+
+30. The bit op functions and octal and hex source code constants are on by
+    default, no longer a configure-time option.  Recognition of non-decimal
+    data is now enabled at runtime with --non-decimal-data command line option.
+
+31. Internationalization features available at the awk level: new TEXTDOMAIN
+    variable and `bindtextdomain' and `dcgettext' functions. printf formats
+    may contain the "%2$3.5d" kind of notation for use in translations.  See
+    the texinfo manual for details.
+
+32. The return value from `close' has been rationalized.  Most notably,
+    closing something that wasn't open returns -1 but remains non-fatal.
+
+33. The array effeciency change from 3.0.5 was reverted; the semantics were
+    not right.  Additionally, index values of previously stored elements
+    can no longer change dynamically.
+
+34. The new option --dump-variables dumps a list of all global variables and
+    their final types and values to a file you give, or to `awkvars.out'.
+
+35. Gawk now uses a recent version of random.c courtesy of the FreeBSD
+    project.
+
+36. The gawk source code now uses ANSI C function definitions (new style),
+    with ansi2knr to translate code for old compilers.
+
+37. `for (iggy in foo)' loops should be more robust now in the face of
+    adding/deleting elements in the middle; they loop over just the elements
+    that are present in the array when the loop starts.
+
+Changes from 3.0.5 to 3.0.6
+---------------------------
+
+This is a bug fix release only, pending further development on 3.1.0.
+
+Bugs fixed and changes made:
+
+1. Subscripting an array with a variable that is just a number no
+   longer magically converts the variable into a string.
+
+2. Similarly, running a `for (iggy in foo)' loop where `foo' is a
+   function parameter now works correctly.
+
+3. Similarly, `i = ""; v[i] = a; if (i in v) ...' now works again.
+
+4. Gawk now special cases `for (iggy in foo) delete foo[iggy]' and
+   treats it as the moral equivalent of `delete foo'.  This should be
+   a major efficiency win when portably deleting large arrays.
+
+5. VMS port brought up to date.
+
+Changes from 3.0.4 to 3.0.5
+---------------------------
+
+This is a bug fix release only, pending further development on 3.1.0.
+
+Bugs Fixed:
+
+ 1. `function foo(foo)' is now a fatal error.
+
+ 2. Array indexing is now much more efficient: where possible, only one
+    copy of an index string is kept, even if used in multiple arrays.
+
+ 3. Support was added for MacOS X and an `install-strip' target.
+
+ 4. [s]printf formatting for `0' flag and floating point formats now
+    works correctly.
+
+ 5. HP-UX large file support with GCC 2.95.1 now works.
+
+ 6. Arguments that contain `=' but that aren't syntactically valid are
+    now treated as filenames, instead of as fatal errors.
+
+ 7. `-v NF=foo' now works.
+
+ 8. Non-ascii alphanumeric characters are now treated as such in the
+    right locales by regex.c.  Similarly, a Latin-1 y-umlaut (decimal
+    value 255) in the program text no longer acts like EOF.
+
+ 9. Array indexes are always compared as strings; fixes an obscure bug
+    when user input gets used for the `x in array' test.
+
+10. The usage message now points users to the documentation for how
+    to report bugs.
+
+11. `/=' now works after an array.
+
+12. `b += b += 1' now works correctly.
+
+13. IGNORECASE changing with calls `match' now works better. (Fix for
+    semi-obscure bug.)
+
+14. Multicharacter values for RS now generate a lint warning.
+
+15. The gawk open file caching is now much more efficient.
+
+16. Global arrays passed to functions are now managed better.  In particular,
+    test/arynocls.awk won't crash referencing freed memory.
+
+17. In obscure cases, `getline var' can no longer clobber $0.
+
+Changes from 3.0.3 to 3.0.4
+---------------------------
+
+This is a bug fix release only, pending further development on 3.1.0.
+
+Bugs Fixed:
+
+ 1. A memory leak when turning a function parameter into an array was
+    fixed.
+
+ 2. The non-decimal data option now works correctly.
+
+ 3. Using an empty pair of brackets as an array subscript no longer causes
+    a core dump during parsing.  In general, syntax errors should not
+    cause core dumps any more.
+ 
+ 4. Standard input is no longer closed if it provides program source,
+    avoiding strange I/O problems.
+
+ 5. Memory corruption during printing with `print' has been fixed.
+
+ 6. The gsub function now correctly counts the number of matches.
+
+ 7. A typo in doc/Makefile.in has been fixed, making installation work.
+
+ 8. Calling `next' or `nextfile' from a BEGIN or END rule is now fatal.
+
+ 9. Subtle problems in rebuilding $0 when fields were changed have been
+    fixed.
+
+10. `FS = FS' now correctly turns off the use of FIELDWIDTHS.
+
+11. Gawk now parses fields correctly when FS is a single character.
+
+12. It is now possible for RS to be the NUL character ("\0").
+
+13. Weird problems with number conversions on MIPS and other systems
+    have been fixed.
+
+14. When parsing using FIELDWIDTHS is in effect, `split' with no third
+    argument will still use the value of FS.
+
+15. Large File Support for Solaris, HP-UX, AIX, and IRIX is now enabled at
+    compile time, thanks to Paul Eggert.
+
+16. Attempting to use the name of a function as a variable or array
+    from within the function is now caught as a fatal error, instead
+    of as a core dump.
+
+17. A bug in parsing hex escapes was fixed.
+
+18. A weird bug with concatenation where one expression has side effects
+    that changes another was fixed.
+
+19. printf/sprintf now behave much better for uses of the '0' and '#' flags
+    and with precisions and field widths.
+
+20. Further strangenesses with concatenation and multiple accesses of some
+    of the special variables was fixed.
+
+21. The Atari port is marked as no longer supported.
+
+22. Build problems on HP-UX have been fixed.
+
+23. Minor fixes and additional explanations added to the documentation.
+
+24. For RS = "", even a single leading newline is now correctly stripped.
+
+25. Obscure parsing problems for regex constants like /=.../ fixed, so
+    that a regex constant is recognized, and not the /= operator.
+
+26. Fixed a bug when closing a redirection that matched the current
+    or last FILENAME.
+
+27. Build problems on AIX fixed.
+
+Changes from 3.0.2 to 3.0.3
+---------------------------
+
+The horrendous per-record memory leak introduced in 3.0.1 is gone, finally.
+
+The `amiga' directory is now gone; Amiga support is now entirely handled
+by the POSIX support.
+
+Windows32 support has been added in the `pc' directory. See `README_d/README.pc'
+for more info.
+
+The mmap changes are disabled in io.c, and will be removed entirely
+in the next big release.  They were an interesting experiment that just
+really didn't work in practice.
+
+A minor memory leak that occurred when using `next' from within a
+function has also been fixed.
+
+Problems with I/O from sub-processes via a pipe are now gone.
+
+Using "/dev/pid" and the other special /dev files no longer causes a core dump.
+
+The files regex.h, regex.c, getopt.h, getopt.c, and getopt1.c have been
+merged with the versions in GNU libc. Thanks to Ulrich Drepper for his help.
+
+Some new undocumented features have been added. Use the source, Luke!
+It is not clear yet whether these will ever be fully supported.
+
+Array performance should be much better for very very large arrays. "Virtual
+memory required, real memory helpful."
+
+builtin.c:do_substr rationalized, again.
+
+The --re-interval option now works as advertised.
+
+The license text on some of the missing/* files is now generic.
+
+Lots more new test cases.
+
+Lots of other small bugs fixed, see the ChangeLog files for details.
+
+Changes from 3.0.1 to 3.0.2
+---------------------------
+
+Gawk now uses autoconf 2.12.
+
+strftime now behaves correctly if passed an empty format string or if
+the string formats to an empty result string.
+
+Several minor compilation and installation problems have been fixed.
+
+Minor page break issues in the user's guide have been fixed.
+
+Lexical errors no longer repeat ad infinitum.
+
+Changes from 3.0.0 to 3.0.1
+---------------------------
+
+Troff source for a handy-dandy five color reference card is now provided.
+Thanks to SSC for their macros.
+
+Gawk now behaves like Unix awk and mawk, in that newline acts as white
+space for separating fields and for `split', by default.  In posix mode,
+only space and tab separate fields. The documentation has been updated to
+reflect this.
+
+Tons and tons of small bugs fixed and new tests added, see the ChangeLogs.
+
+Lots fewer compile time warnings from gcc -Wall. Remaining ones aren't
+worth fixing.
+
+Gawk now pays some attention to the locale settings.
+
+Fixes to gsub to catch several corner cases.
+
+The `print' statement now evaluates all expressions first, and then
+prints them. This leads to less suprising behaviour if any expression has
+output side effects.
+
+Miscellanious improvements in regex.h and regex.c.
+
+Gawk will now install itself as gawk-M.N.P in $(bindir), and link
+`gawk' to it. This makes it easy to have multiple versions of gawk
+simultaneously. It will also now install itself as `awk' in $(bindir)
+if there is no `awk' there. This is in addition to installing itself as
+`gawk'. This change benefits the Hurd, and possibly other systems.  One
+day, gawk will drop the `g', but not yet.
+
+`--posix' turns on interval expressions. Gawk now matches its documentation.
+
+`close(FILENAME)' now does something meaningful.
+
+Field management code in field.c majorly overhauled, several times.
+
+The gensub code has been fixed, several bugs are now gone.
+
+Gawk will use mmap for data file input if it is available.
+
+The printf/sprintf code has been improved.
+
+Minor issues in Makefile setup worked on and improved.
+
+builtin.c:do_substr rationalized.
+
+Regex matching fixed so that /+[0-9]/ now matches the leading +.
+
+For building on vms, the default compiler is now DEC C rather than VAX C.
+
+Changes from 2.15.6 to 3.0.0
+----------------------------
+
+Fixed spelling of `Programming' in the copyright notice in all the files.
+
+New --re-interval option to turn on interval expressions. They're off
+by default, except for --posix, to avoid breaking old programs.
+
+Passing regexp constants as parameters to user defined functions now
+generates a lint warning.
+
+Several obscure regexp bugs fixed; alas, a small number remain.
+
+The manual has been thoroughly revised. It's now almost 50% bigger than
+it used to be.
+
+The `+' modifier in printf is now reset correctly for each item.
+
+The do_unix variable is now named do_traditional.
+
+Handling of \ in sub and gsub rationalized (somewhat, see the manual for
+the gory [and I do mean gory] details).
+
+IGNORECASE now uses ISO 8859-1 Latin-1 instead of straight ASCII. See the
+source for how to revert to pure ASCII.
+
+--lint will now warn if an assignment occurs in a conditional context.
+This may become obnoxious enough to need turning off in the future, but
+"it seemed like a good idea at the time."
+
+%hf and %Lf are now diagnosed as invalid in printf, just like %lf.
+
+Gawk no longer incorrectly closes stdin in child processes used in
+input pipelines.
+
+For integer formats, gawk now correctly treats the precision as the
+number of digits to print, not the number of characters.
+
+gawk is now much better at catching the use of scalar values when
+arrays are needed, both in function calls and the `x in y' constructs.
+
+New gensub function added. See the manual.
+
+If do_tradtional is true, octal and hex escapes in regexp constants are
+treated literally.  This matches historical behavior.
+
+yylex/nextc fixed so that even null characters can be included
+in the source code.
+
+do_format now handles cases where a format specifier doesn't end in
+a control letter. --lint reports an error.
+
+strftime() now uses a default time format equivalent to that of the
+Unix date command, thus it can be called with no arguments.
+
+Gawk now catches functions that are used but not defined at parse time
+instead of at run time. (This is a lint error, making it fatal could break
+old code.)
+
+Arrays that max out are now handled correctly.
+
+Integer formats outside the range of an unsigned long are now detected
+correctly using the SunOS 4.x cc compiler.
+
+--traditional option added as new preferred name for --compat, in keeping
+with GCC.
+
+--lint-old option added, so that warnings about things not in old awk
+are only given if explicitly asked for.
+
+`next file' has changed to one word, `nextfile'. `next file' is still
+accepted but generates a lint warning. `next file' will go away eventually.
+
+Gawk with --lint will now notice empty source files and empty data files.
+
+Amiga support using the Unix emulation added. Thanks to fnf@ninemoons.com.
+
+test/Makefile is now "parallel-make safe".
+
+Gawk now uses POSIX regexps + GNU regex ops by default. --posix goes to
+pure posix regexps, and --compat goes to traditional Unix regexps. However,
+interval expressions, even though specified by POSIX, are turned off by
+default, to avoid breaking old code.
+
+IGNORECASE now applies to string comparison as well as regexp operations.
+
+The AT&T Bell Labs Research awk fflush builtin function is now supported.
+fflush is extended to flush stdout if no arg and everything if given
+the null string as an argument.
+
+If RS is more than one character, it is treated as a regular expression
+and records are delimited accordingly.  The variable RT is set to the record
+terminator string. This is disabled in compatibility mode.
+
+If FS is set to the null string (or the third arg. of split() is the null
+string), splitting is done at every single character. This is disabled in
+compatibility mode.
+
+Gawk now uses the Autoconf generated configure script, doing away with all
+the config/* files and the machinery that went with them.  The Makefile.in
+has also changed accordingly, complete with all the standard GNU Makefile
+targets.  (Non-unix systems may still have their own config.h and Makefile;
+see the appropriate README_d/README.* and/or subdirectory.)
+
+The source code has been cleaned up somewhat and the formatting improved.
+
+Changes from 2.15.5 to 2.15.6
+-----------------------------
+
+Copyrights updated on all changed files.
+
+test directory enhanced with four new tests.
+
+Gawk now generates a warning for \x without following hexadecimal digits.
+In this case, it returns 'x', not \0.
+
+Several fixes in main.c related to variable initialization:
+	CONVFMT has a default value
+	resetup is called before initializing variables
+	the varinit table fixed up a bit (see the comments)
+
+gawk.1 updated with new BUG REPORTS section.
+
+A plain `print' inside a BEGIN or END now generates a lint warning (awk.y).
+
+Small fix in iop.c:get_a_record to avoid reading uninitialized memory.
+
+awk.y:yylex now does a better job of handling things if the source file
+does not end in a newline. Probably there is more work to be done.
+
+Memory leaks fixed in awk.y, particularly in cases of duplicate function
+parameters. Also, calling a function doesn't leak memory during parsing.
+
+Empty function bodies are now allowed (awk.y).
+
+Gawk now detects duplicate parameter names in functions (awk.y).
+
+New function `error' in msg.c added for use from awk.y.
+
+eval.c:r_get_lhs now checks if its argument is a parameter on the stack,
+and pulls down the real variable. This catches more 'using an array as
+a scalar' kinds of errors.
+
+main.c recovers C alloca space after parsing, this is important for
+bison-based parsers. re.c recovers C alloca space after doing an research.
+[Changes from Pat Rankin]
+
+builtin.c now declares the random() related functions based on
+RANDOM_MISSING from config.h. [Suggested by Pat Rankin]
+
+awk.h now handles alloca correctly for HP-UX. [Kaveh Ghazi]
+
+regex.h and config/cray60 updated for Unicos 8.0. [Hal Peterson]
+
+Fixed re.c and dfa.c so that gawk no longer leaks memory when using
+lots of dynamic regexps.
+
+Removed dependency on signed chars from `idx' variable in awk.h. Gawk
+now passes its test suite if compiled with `gcc -fno-signed-char'.
+
+Fixed warning on close in io.c to go under lint control. Too many people
+have complained about the spurious message, particularly when closing a
+child pipeline early.
+
+Gawk now correctly handles RS = "" when input is from a terminal
+(iop.c:get_a_record).
+
+Config file added for GNU.
+
+gawk 'BEGIN { exit 1 } ; END { exit }' now exits 1, as it should
+(eval.c:interpret).
+
+sub and gsub now follow posix, \ escapes both & and \. Each \ must
+be doubled initially in the program to get it into the string.
+Thanks to Mike Brennan for pointing this out (builtin.c:sub_common).
+
+If FS is "", gawk behaves like mawk and nawk, making the whole record be $1.
+Yet Another Dark Corner. Sigh (field.c:def_parse_field).
+
+Gawk now correctly recomputes string values for numbers if CONVFMT has
+changed (awk.h:force_string, node.c:r_force_string).
+
+A regexp of the form `/* this looks like a comment but is not */' will
+now generate a warning from --lint (awk.y).
+
+Gawk will no longer core dump if given an empty input file (awk.y:get_src_buf,
+iop.c:optimal_bufsize).
+
+A printf format of the form %lf is handled correctly. The `l' generates
+a lint warning (builtin.c:format_tree) [Thanks to Mark Moraes].
+
+Lynxos config file added.
+
+`continue' outside a loop treated as `next' only in compatibility mode,
+instead of by default; recent att nawk chokes on this now.  `break'
+outside a loop now treated as `next' in compatibility mode (eval.c).
+
+Bug fix in string concatenation, an arbitrary number of expressions
+are allowed (eval.c).
+
+$1 += $2 now works correctly (eval.c).
+
+Changing IGNORECASE no longer resets field-splitting to FS if it was
+using FIELDWIDTHS (eval.c, field.c).
+
+Major enhancement: $0 and NF for last record read are now preserved
+into the END rule (io.c).
+
+Regexp fixes:
+	/./ now matches a newline (regex.h)
+	^ and $ match beginning and end of string only, not any embedded
+		newlines (re.c)
+	regex.c should compile and work ok on 64-bit mips/sgi machines
+
+Changes from 2.15.4 to 2.15.5
+-----------------------------
+
+FUTURES file updated and re-arranged some with more rational schedule.
+
+Many prototypes handled better for ANSI C in protos.h.
+
+getopt.c updated somewhat.
+
+test/Makefile now removes junk directory, `bardargtest' renamed `badargs.'
+
+Bug fix in iop.c for RS = "". Eat trailing newlines off of record separator.
+
+Bug fix in Makefile.bsd44, use leading tab in actions.
+
+Fix in field.c:set_FS for FS == "\\" and IGNORECASE != 0.
+
+Config files updated or added:
+	cray60, DEC OSF/1 2.0, Utek, sgi405, next21, next30, atari/config.h,
+	sco.
+
+Fix in io.c for ENFILE as well as EMFILE, update decl of groupset to
+include OSF/1.
+
+Rationalized printing as integers if numbers are outside the range of a long.
+Changes to node.c:force_string and builtin.c.
+
+Made internal NF, NR, and FNR variables longs instead of ints.
+
+Add LIMITS_H_MISSING stuff to config.in and awk.h, and default defs for
+INT_MAX and LONG_MAX, if no limits.h file. Add a standard decl of
+the time() function for __STDC__. From ghazi@noc.rutgers.edu.
+
+Fix tree_eval in awk.h and r_tree_eval in eval.c to deal better with
+function parameters, particularly ones that are arrays.
+
+Fix eval.c to print out array names of arrays used in scalar contexts.
+
+Fix eval.c in interpret to zero out source and sourceline initially. This
+does a better job of providing source file and line number information.
+
+Fix to re_parse_field in field.c to not use isspace when RS = "", but rather
+to explicitly look for blank and tab.
+
+Fix to sc_parse_field in field.c to catch the case of the FS character at the
+end of a record.
+
+Lots of miscellanious bug fixes for memory leaks, courtesy Mark Moraes,
+also fixes for arrays.
+
+io.c fixed to warn about lack of explicit closes if --lint.
+
+Updated missing/strftime.c to match posted strftime 6.2.
+
+Bug fix in builtin.c, in case of non-match in sub_common.
+
+Updated constant used for division in builtin.c:do_rand for DEC Alpha
+and CRAY Y-MP.
+
+POSIXLY_CORRECT in the environment turns on --posix (fixed in main.c).
+
+Updated srandom prototype and calls in builtin.c.
+
+Fix awk.y to enforce posix semantics of unary +: result is numeric.
+
+Fix array.c to not rearrange the hash chain upon finding an index in
+the array.  This messed things up in cases like:
+	for (index1 in array) {
+		blah
+		if (index2 in array)	# blew away the for
+			stuff
+	}
+
+Fixed spelling errors in the man page.
+
+Fixes in awk.y so that
+	gawk '' /path/to/file
+will work without core dumping or finding parse errors.
+
+Fix main.c so that --lint will fuss about an empty program.
+Yet another fix for argument parsing in the case of unrecognized options.
+
+Bug fix in dfa.c to not attempt to free null pointers.
+
+Bug fix in builtin.c to only use DEFAULT_G_PRECISION for %g or %G.
+
+Bug fix in field.c to achieve call by value semantics for split.
+
+Changes from 2.15.3 to 2.15.4
+-----------------------------
+
+Lots of lint fixes, and do_sprintf made mostly ANSI C compatible.
+
+Man page updated and edited.
+
+Copyrights updated.
+
+Arrays now grow dynamically, initially scaling up by an order of magnitude
+  and then doubling, up to ~ 64K.  This should keep gawk's performance
+  graceful under heavy load.
+
+New `delete array' feature added.  Only documented in the man page.
+
+Switched to dfa and regex suites from grep-2.0. These offer the ability to
+  move to POSIX regexps in the next release.
+
+Disabled GNU regex ops.
+
+Research awk -m option now recognized. It does nothing in gawk, since gawk
+  has no static limits.  Only documented in the man page.
+
+New bionic (faster, better, stronger than before) hashing function.
+
+Bug fix in argument handling. `gawk -X' now notices there was no program.
+  Additional bug fixes to make --compat and --lint work again.
+
+Many changes for systems where sizeof(int) != sizeof(void *).
+
+Add explicit alloca(0) in io.c to recover space from C alloca.
+
+Fixed file descriptor leak in io.c.
+
+The --version option now follows the GNU coding standards and exits.
+
+Fixed several prototypes in protos.h.
+
+Several tests updated. On Solaris, warn that the out? tests will fail.
+
+Configuration files for SunOS with cc and Solaris 2.x added.
+
+Improved error messages in awk.y on gawk extensions if do_unix or do_compat.
+
+INSTALL file added.
+
+Fixed Atari Makefile and several VMS specific changes.
+
+Better conversion of numbers to strings on systems with broken sprintfs.
+
+Changes from 2.15.2 to 2.15.3
+-----------------------------
+
+Increased HASHSIZE to a decent number, 127 was way too small.
+
+FILENAME is now the null string in a BEGIN rule.
+
+Argument processing fixed for invalid options and missing arguments.
+
+This version will build on VMS.  This included a fix to close all files
+   and pipes opened with redirections before closing stdout and stderr.
+
+More getpgrp() defines.
+
+Changes for BSD44:  <sys/param.h> in io.c and Makefile.bsd44.
+
+All directories in the distribution are now writable.
+
+Separated LDFLAGS and CFLAGS in Makefile.  CFLAGS can now be overridden by
+  user.
+
+Make dist now builds compressed archives ending in .gz and runs doschk.
+
+Amiga port.
+
+New getopt.c fixes Alpha OSF/1 problem.
+
+Make clean now removes possible test output.
+
+Improved algorithm for multiple adjacent string concatenations leads to
+  performance improvements.
+
+Fix nasty bug whereby command-line assignments, both with -v and at run time,
+   could create variables with syntactically illegal names.
+
+Fix obscure bug in printf with %0 flag and filling.
+
+Add a lint check for substr if provided length exceeds remaining characters
+   in string.
+
+Update atari support.
+
+PC support enhanced to include support for both DOS and OS/2. (Lots more
+   #ifdefs. Sigh.)
+
+Config files for Hitachi Unix and OSF/1, courtesy of Yoko Morishita
+   (morisita@sra.co.jp)
+
+Changes from 2.15.1 to 2.15.2
+-----------------------------
+
+Additions to the FUTURES file.
+
+Document undefined order of output when using both standard output
+  and /dev/stdout or any of the /dev output files that gawk emulates in
+  the absence of OS support.
+
+Clean up the distribution generation in Makefile.in:  the info files are
+  now included, the distributed files are marked read-only and patched
+  distributions are now unpacked in a directory named with the patch level.
+
+Changes from 2.15 to 2.15.1
+---------------------------
+
+Close stdout and stderr before all redirections on program exit.  This allows
+  detection of write errors and also fixes the messages test on Solaris 2.x.
+
+Removed YYMAXDEPTH define in awk.y which was limiting the parser stack depth.
+
+Changes to config/bsd44, Makefile.bsd44 and configure to bring it into line
+  with the BSD4.4 release.
+
+Changed Makefile to use prefix, exec_prefix, bindir etc.
+
+make install now installs info files.
+
+make install now sets permissions on installed files.
+
+Make targets added:  uninstall, distclean, mostlyclean and realclean.
+
+Added config.h to cleaner and clobber make targets.
+
+Changes to config/{hpux8x,sysv3,sysv4,ultrix41} to deal with alloca().
+
+Change to getopt.h for portability.
+
+Added more special cases to the getpgrp() call.
+
+Added README.ibmrt-aos and config/ibmrt-aos.
+
+Changes from 2.14 to 2.15
+---------------------------
+
+Command-line source can now be mixed with library functions.
+
+ARGIND variable tracks index in ARGV of FILENAME.
+
+GNU style long options in addition to short options.
+
+Plan 9 style special files interpreted by gawk:
+        /dev/pid
+        /dev/ppid
+        /dev/pgrpid
+        /dev/user
+                $1 = getuid
+                $2 = geteuid
+                $3 = getgid
+                $4 = getegid
+                $5 ... $NF = getgroups if supported
+
+ERRNO variable contains error string if getline or close fails.
+
+Very old options -a and -e have gone away.
+
+Inftest has been removed from the default target in test/Makefile -- the
+  results were too machine specific and resulted in too many false alarms.
+
+A README.amiga has been added.
+
+The "too many arguments supplied for format string" warning message is only
+  in effect under the lint option.
+
+Code improvements in dfa.c.
+
+Fixed all reported bugs:
+
+	Writes are checked for failure (such as full filesystem).
+
+	Stopped (at least some) runaway error messages.
+
+	gsub(/^/, "x") does the right thing for $0 of 0, 1, or more length.
+
+	close() on a command being piped to a getline now works properly.
+
+	The input record will no longer be freed upon an explicit close()
+	of the input file.
+
+	A NUL character in FS now works.
+
+	In a substitute, \\& now means a literal backslash followed by what
+	was matched.
+
+	Integer overflow of substring length in substr() is caught.
+
+	An input record without a newline termination is handled properly.
+
+	In io.c, check is against only EMFILE so that system file table
+	  is not filled.
+
+	Renamed all files with names longer than 14 characters.
+
+	Escaped characters in regular expressions were being lost when 
+	  IGNORECASE was used.
+
+	Long source lines were not being handled properly.
+
+	Sourcefiles that ended in a tab but no newline were bombing.
+
+	Patterns that could match zero characters in split() were not working
+	  properly.
+
+	The parsedebug option was not working.
+
+	The grammar was being a bit too lenient, allowing some very dubious
+	  programs to pass.
+
+	Compilation with DEBUG defined now works.
+
+	A variable read in with getline was not being treated as a potential
+	  number.
+
+	Array subscripts were not always of string type.
+
+
+Changes from 2.13.2 to 2.14
+---------------------------
+
+Updated manual!
+
+Added "next file" to skip efficiently to the next input file.
+
+Fixed potential of overflowing buffer in do_sprintf().
+
+Plugged small memory leak in sub_common().
+
+EOF on a redirect is now "sticky" -- it can only be cleared by close()ing
+  the pipe or file.
+
+Now works if used via a #! /bin/gawk line at the top of an executable file
+  when that line ends with whitespace.
+
+Added some checks to the grammar to catch redefinition of builtin functions.
+  This could eventually be the basis for an extension to allow redefining
+  functions, but in the mean time it's a good error catching facility.
+
+Negative integer exponents now work.
+
+Modified do_system() to make sure it had a non-null string to be passed
+  to system(3). Thus, system("") will flush any pending output but not go
+  through the overhead of forking an un-needed shell.
+
+A fix to floating point comparisons so that NaNs compare right on IEEE systems.
+
+Added code to make sure we're not opening directories for reading and such.
+
+Added code to do better diagnoses of weird or null file names.
+
+Allow continue outside of a loop, unless in strict posix mode.  Lint option
+  will issue warning.
+
+New missing/strftime.c.  There has been one change that affects gawk.  Posix
+  now defines a %V conversion so the vms conversion has been changed to %v.
+  If this version is used with gawk -Wlint and they use %V in a call to
+  strftime, they'll get a warning.
+
+Error messages now conform to GNU standard (I hope).
+
+Changed comparisons to conform to the  description found in the file POSIX.
+  This is inconsistent with the current POSIX draft, but that is broken.
+  Hopefully the final POSIX standard will conform to this version.
+  (Alas, this will have to wait for 1003.2b, which will be a revision to
+  the 1003.2 standard.  That standard has been frozen with the broken
+  comparison rules.)
+
+The length of a string was a short and now is a size_t.
+
+Updated VMS help.
+
+Added quite a few new tests to the test suite and deleted many due to lack of
+  written releases.  Test output is only removed if it is identical to the
+  "good" output.
+
+Fixed a couple of bugs for reference to $0 when $0 is "" -- particularly in
+  a BEGIN block.
+
+Fixed premature freeing in construct "$0 = $0".
+
+Removed the call to wait_any() in gawk_popen(), since on at least some systems,
+  if gawk's input was from a pipe, the predecessor process in the pipe was a
+  child of gawk and this caused a deadlock.
+
+Regexp can (once again) match a newline, if given explicitly.
+
+nextopen() makes sure file name is null terminated.
+
+Fixed VMS pipe simulation.  Improved VMS I/O performance.
+
+Catch . used in variable names.
+
+Fixed bug in getline without redirect from a file -- it was quitting after the
+  first EOF, rather than trying the next file.
+
+Fixed bug in treatment of backslash at the end of a string -- it was bombing
+  rather than doing something sensible.  It is not clear what this should mean,
+  but for now I issue a warning and take it as a literal backslash.
+
+Moved setting of regexp syntax to before the option parsing in main(), to
+  handle things like -v FS='[.,;]'
+
+Fixed bug when NF is set by user -- fields_arr must be expanded if necessary
+  and "new" fields must be initialized.
+
+Fixed several bugs in [g]sub() for no match found or the match is 0-length.
+
+Fixed bug where in gsub() a pattern anchored at the beginning would still
+  substitute throughout the string.
+
+make test does not assume that . is in PATH.
+
+Fixed bug when a field beyond the end of the record was requested after
+  $0 was altered (directly or indirectly).
+
+Fixed bug for assignment to field beyond end of record -- the assigned value
+  was not found on subsequent reference to that field.
+
+Fixed bug for FS a regexp and it matches at the end of a record.
+
+Fixed memory leak for an array local to a function.
+
+Fixed hanging of pipe redirection to getline
+
+Fixed coredump on access to $0 inside BEGIN block.
+
+Fixed treatment of RS = "".  It now parses the fields correctly and strips
+  leading whitespace from a record if FS is a space.
+
+Fixed faking of /dev/stdin.
+
+Fixed problem with x += x
+
+Use of scalar as array and vice versa is now detected.
+
+IGNORECASE now obeyed for FS (even if FS is a single alphabetic character).
+
+Switch to GPL version 2.
+
+Renamed awk.tab.c to awktab.c for MSDOS and VMS tar programs.
+
+Renamed this file (CHANGES) to NEWS.
+
+Use fmod() instead of modf() and provide FMOD_MISSING #define to undo
+  this change.
+
+Correct the volatile declarations in eval.c.
+
+Avoid errant closing of the file descriptors for stdin, stdout and stderr.
+
+Be more flexible about where semi-colons can occur in programs.
+
+Check for write errors on all output, not just on close().
+
+Eliminate the need for missing/{strtol.c,vprintf.c}.
+
+Use GNU getopt and eliminate missing/getopt.c.
+
+More "lint" checking.
+
+
+Changes from 2.13.1 to 2.13.2
+-----------------------------
+
+Toward conformity with GNU standards, configure is a link to mkconf, the latter
+  to disappear in the next major release.
+
+Update to config/bsd43.
+
+Added config/apollo, config/msc60, config/cray2-50, config/interactive2.2
+
+sgi33.cc added for compilation using cc rather than gcc.
+
+Ultrix41 now propagates to config.h properly -- as part of a general
+  mechanism in configure for kludges -- #define anything from a config file
+  just gets tacked onto the end of config.h -- to be used sparingly.
+
+Got rid of an unnecessary and troublesome declaration of vprintf().
+
+Small improvement in locality of error messages.
+
+Try to diagnose use of array as scalar and vice versa -- to be improved in
+  the future.
+
+Fix for last bug fix for Cray division code--sigh.
+
+More changes to test suite to explicitly use sh.  Also get rid of 
+  a few generated files.
+
+Fixed off-by-one bug in string concatenation code.
+
+Fix for use of array that is passed in from a previous function parameter.
+  Addition to test suite for above.
+
+A number of changes associated with changing NF and access to fields
+  beyond the end of the current record.
+
+Change to missing/memcmp.c to avoid seg. fault on zero length input.
+
+Updates to test suite (including some inadvertently left out of the last patch)
+  to invoke sh explicitly (rather than rely on #!/bin/sh) and remove some
+  junk files.  test/chem/good updated to correspond to bug fixes.
+
+Changes from 2.13.0 to 2.13.1
+-----------------------------
+
+More configs and PORTS.
+
+Fixed bug wherein a simple division produced an erroneous FPE, caused by
+  the Cray division workaround -- that code is now #ifdef'd only for
+  Cray *and* fixed.
+
+Fixed bug in modulus implementation -- it was very close to the above
+  code, so I noticed it.
+
+Fixed portability problem with limits.h in missing.c
+
+Fixed portability problem with tzname and daylight -- define TZNAME_MISSING
+  if strftime() is missing and tzname is also.
+
+Better support for Latin-1 character set.
+
+Fixed portability problem in test Makefile.
+
+Updated PROBLEMS file.
+
+=============================== gawk-2.13 released =========================
+Changes from 2.12.42 to 2.12.43
+-------------------------------
+
+Typo in awk.y
+
+Fixed up strftime.3 and added doc. for %V.
+
+Changes from 2.12.41 to 2.12.42
+-------------------------------
+
+Fixed bug in devopen() -- if you had write permission in /dev,
+  it would just create /dev/stdout etc.!!
+
+Final (?) VMS update.
+
+Make NeXT use GFMT_WORKAROUND
+
+Fixed bug in sub_common() for substitute on zero-length match.  Improved the
+  code a bit while I was at it.
+
+Fixed grammar so that $i++ parses as ($i)++
+
+Put support/* back in the distribution (didn't I already do this?!)
+
+Changes from 2.12.40 to 2.12.41
+-------------------------------
+
+VMS workaround for broken %g format.
+
+Changes from 2.12.39 to 2.12.40
+-------------------------------
+
+Minor man page update.
+
+Fixed latent bug in redirect().
+
+Changes from 2.12.38 to 2.12.39
+-------------------------------
+
+Updates to test suite -- remove dependence on changing gawk.1 man page.
+
+Changes from 2.12.37 to 2.12.38
+-------------------------------
+
+Fixed bug in use of *= without whitespace following.
+
+VMS update.
+
+Updates to man page.
+
+Option handling updates in main.c
+
+test/manyfiles redone and added to bigtest.
+
+Fixed latent (on Sun) bug in handling of save_fs.
+
+Changes from 2.12.36 to 2.12.37
+-------------------------------
+
+Update REL in Makefile-dist.  Incorporate test suite into main distribution.
+
+Minor fix in regtest.
+
+Changes from 2.12.35 to 2.12.36
+-------------------------------
+
+Release takes on dual personality -- 2.12.36 and 2.13.0 -- any further
+  patches before public release won't count for 2.13, although they will for
+  2.12 -- be careful to avoid confusion!  patchlevel.h will be the last thing
+  to change.
+
+Cray updates to deal with arithmetic problems.
+
+Minor test suite updates.
+
+Fixed latent bug in parser (freeing memory).
+
+Changes from 2.12.34 to 2.12.35
+-------------------------------
+
+VMS updates.
+
+Flush stdout at top of err() and stderr at bottom.
+
+Fixed bug in eval_condition() -- it wasn't testing for MAYBE_NUM and
+  doing the force_number().
+
+Included the missing manyfiles.awk and a new test to catch the above bug which
+  I am amazed wasn't already caught by the test suite -- it's pretty basic.
+
+Changes from 2.12.33 to 2.12.34
+-------------------------------
+
+Atari updates -- including bug fix.
+
+More VMS updates -- also nuke vms/version.com.
+
+Fixed bug in handling of large numbers of redirections -- it was probably never
+  tested before (blush!).
+
+Minor rearrangement of code in r_force_number().
+
+Made chem and regtest tests a bit more portable (Ultrix again).
+
+Added another test -- manyfiles -- not invoked under any other test -- very Unix
+  specific.
+
+Rough beginning of LIMITATIONS file -- need my AWK book to complete it.
+
+Changes from 2.12.32 to 2.12.33
+-------------------------------
+
+Expunge debug.? from various files.
+
+Remove vestiges of Floor and Ceil kludge.
+
+Special case integer division -- mainly for Cray, but maybe someone else
+  will benefit.
+
+Workaround for iop_close closing an output pipe descriptor on Cray --
+  not conditional since I think it may fix a bug on SGI as well and I don't
+  think it can hurt elsewhere.
+
+Fixed memory leak in assoc_lookup().
+
+Small cleanup in test suite.
+
+Changes from 2.12.31 to 2.12.32
+-------------------------------
+
+Nuked debug.c and debugging flag -- there are better ways.
+
+Nuked version.sh and version.c in subdirectories.
+
+Fixed bug in handling of IGNORECASE.
+
+Fixed bug when FIELDWIDTHS was set via -v option.
+
+Fixed (obscure) bug when $0 is assigned a numerical value.
+
+Fixed so that escape sequences in command-line assignments work (as it already
+  said in the comment).
+
+Added a few cases to test suite.
+
+Moved support/* back into distribution.
+
+VMS updates.
+
+Changes from 2.12.30 to 2.12.31
+-------------------------------
+
+Cosmetic manual page changes.
+
+Updated sunos3 config.
+
+Small changes in test suite including renaming files over 14 chars. in length.
+
+Changes from 2.12.29 to 2.12.30
+-------------------------------
+
+Bug fix for many string concatenations in a row.
+
+Changes from 2.12.28 to 2.12.29
+-------------------------------
+
+Minor cleanup in awk.y
+
+Minor VMS update.
+ 
+Minor atari update.
+
+Changes from 2.12.27 to 2.12.28
+-------------------------------
+
+Got rid of the debugging goop in eval.c -- there are better ways.
+
+Sequent port.
+
+VMS changes left out of the last patch -- sigh!  config/vms.h renamed
+  to config/vms-conf.h.
+
+Fixed missing/tzset.c
+
+Removed use of gcvt() and GCVT_MISSING -- turns out it was no faster than
+  sprintf("%g") and caused all sorts of portability headaches.
+
+Tuned get_field() -- it was unnecessarily parsing the whole record on reference
+  to $0.
+
+Tuned interpret() a bit in the rule_node loop.
+
+In r_force_number(), worked around bug in Uglix strtod() and got rid of 
+  ugly do{}while(0) at Michal's urging.
+
+Replaced do_deref() and deref with unref(node) -- much cleaner and a bit faster.
+
+Got rid of assign_number() -- contrary to comment, it was no faster than
+  just making a new node and freeing the old one.
+
+Replaced make_number() and tmp_number() with macros that call mk_number().
+
+Changed freenode() and newnode() into macros -- the latter is getnode()
+  which calls more_nodes() as necessary.
+
+Changes from 2.12.26 to 2.12.27
+-------------------------------
+
+Completion of Cray 2 port (includes a kludge for floor() and ceil()
+  that may go or be changed -- I think that it may just be working around
+  a bug in chem that is being tweaked on the Cray).
+
+More VMS updates.
+
+Moved kludge over yacc's insertion of malloc and realloc declarations
+  from protos.h to the Makefile.
+
+Added a lisp interpreter in awk to the test suite.  (Invoked under
+  bigtest.)
+
+Cleanup in r_force_number() -- I had never gotten around to a thorough
+  profile of the cache code and it turns out to be not worth it.
+
+Performance boost -- do lazy force_number()'ing for fields etc. i.e.
+  flag them (MAYBE_NUM) and call force_number only as necessary.
+
+Changes from 2.12.25 to 2.12.26
+-------------------------------
+
+Rework of regexp stuff so that dynamic regexps have reasonable
+  performance -- string used for compiled regexp is stored and
+  compared to new string -- if same, no recompilation is necessary.
+  Also, very dynamic regexps cause dfa-based searching to be turned
+  off.
+
+Code in dev_open() is back to returning fileno(std*) rather than
+  dup()ing it.  This will be documented.  Sorry for the run-around
+  on this.
+
+Minor atari updates.
+
+Minor vms update.
+
+Missing file from MSDOS port.
+
+Added warning (under lint) if third arg. of [g]sub is a constant and
+  handle it properly in the code (i.e. return how many matches).
+
+Changes from 2.12.24 to 2.12.25
+-------------------------------
+
+MSDOS port.
+
+Non-consequential changes to regexp variables in preparation for
+  a more serious change to fix a serious performance problem.
+
+Changes from 2.12.23 to 2.12.24
+-------------------------------
+
+Fixed bug in output flushing introduced a few patches back.  This caused
+  serious performance losses.
+
+Changes from 2.12.22 to 2.12.23
+-------------------------------
+
+Accidentally left config/cray2-60 out of last patch.
+
+Added some missing dependencies to Makefile.
+
+Cleaned up mkconf a bit; made yacc the default parser (no alloca needed,
+  right?); added rs6000 hook for signed characters.
+
+Made regex.c with NO_ALLOCA undefined work.
+
+Fixed bug in dfa.c for systems where free(NULL) bombs.
+
+Deleted a few cant_happen()'s that *really* can't hapen.
+
+Changes from 2.12.21 to 2.12.22
+-------------------------------
+
+Added to config stuff the ability to choose YACC rather than bison.
+
+Fixed CHAR_UNSIGNED in config.h-dist.
+
+Second arg. of strtod() is char ** rather than const char **. 
+
+stackb is now initially malloc()'ed since it may be realloc()'ed.
+
+VMS updates.
+
+Added SIZE_T_MISSING to config stuff and a default typedef to awk.h.
+  (Maybe it is not needed on any current systems??)
+
+re_compile_pattern()'s size is now size_t unconditionally.
+
+Changes from 2.12.20 to 2.12.21
+-------------------------------
+
+Corrected missing/gcvt.c.
+
+Got rid of use of dup2() and thus DUP_MISSING.
+
+Updated config/sgi33.
+
+Turned on (and fixed) in cmp_nodes() the behaviour that I *hope* will be in
+  POSIX 1003.2 for relational comparisons.
+
+Small updates to test suite.
+
+Changes from 2.12.19 to 2.12.20
+-------------------------------
+
+Sloppy, sloppy, sloppy!!  I didn't even try to compile the last two
+  patches.  This one fixes goofs in regex.c.
+
+Changes from 2.12.18 to 2.12.19
+-------------------------------
+
+Cleanup of last patch.
+
+Changes from 2.12.17 to 2.12.18
+-------------------------------
+
+Makefile renamed to Makefile-dist.
+
+Added alloca() configuration to mkconf.  (A bit kludgey.)  Just
+  add a single line containing ALLOCA_PW, ALLOCA_S or ALLOCA_C
+  to the appropriate config file to have Makefile-dist edited
+  accordingly.
+
+Reorganized output flushing to correspond with new semantics of
+  devopen() on "/dev/std*" etc.
+
+Fixed rest of last goof!!
+
+Save and restore errno in do_pathopen().
+
+Miscellaneous atari updates.
+
+Get rid of the trailing comma in the NODETYPE definition (Cray
+  compiler won't take it).
+
+Try  to make the use of `const' consistent since Cray compiler is
+  fussy about that.  See the changes to `basename' and `myname'.
+
+It turns out that, according to section 3.8.3 (Macro Replacement)
+  of the ANSI Standard:  ``If there are sequences of preprocessing
+  tokens within the list of arguments that would otherwise act as
+  preprocessing directives, the behavior is undefined.''  That means
+  that you cannot count on the behavior of the declaration of
+  re_compile_pattern in awk.h, and indeed the Cray compiler chokes on it.
+
+Replaced alloca with malloc/realloc/free in regex.c.  It was much simpler
+  than expected.  (Inside NO_ALLOCA for now -- by default no alloca.)
+
+Added a configuration file, config/cray60, for Unicos-6.0.
+
+Changes from 2.12.16 to 2.12.17
+-------------------------------
+
+Ooops.  Goofed signal use in last patch.
+
+Changes from 2.12.15 to 2.12.16
+-------------------------------
+
+RENAMED *_dir to just * (e.g. missing_dir).
+
+Numerous VMS changes.
+
+Proper inclusion of atari and vms files.
+
+Added experimental (ifdef'd out) RELAXED_CONTINUATION and DEFAULT_FILETYPE
+ -- please comment on these!
+
+Moved pathopen() to io.c (sigh).
+
+Put local directory ahead in default AWKPATH.
+
+Added facility in mkconf to echo comments on stdout:  lines beginning
+  with "#echo " will have the remainder of the line echoed when mkconf is run.
+  Any lines starting with "#" will otherwise be treated as comments.  The
+  intent is to be able to say:
+  "#echo Make sure you uncomment alloca.c in the Makefile"
+  or the like.
+
+Prototype fix for V.4
+
+Fixed version_string to not print leading @(#).
+
+Fixed FIELDWIDTHS to work with strict (turned out to be easy).
+
+Fixed conf for V.2.
+
+Changed semantics of /dev/fd/n to be like on real /dev/fd.
+
+Several configuration and updates in the makefile.
+
+Updated manpage.
+
+Include tzset.c and system.c from missing_dir that were accidently left out of
+  the last patch.
+
+Fixed bug in cmdline variable assignment -- arg was getting freed(!) in
+  call to variable.
+
+Backed out of parse-time constant folding for now, until I can figure out
+  how to do it right.
+
+Fixed devopen() so that getline <"-" works.
+
+Changes from 2.12.14 to 2.12.15
+-------------------------------
+
+Changed config/* to a condensed form that can be used with mkconf to generate
+  a config.h from config.h-dist -- much easier to maintain.  Please check
+  carefully against what you had before for a particular system and report
+  any problems.  vms.h remains separate since the stuff at the bottom
+  didn't quite fit the mkconf model -- hopefully cleared up later.
+
+Fixed bug in grammar -- didn't allow function definition to be separated from 
+  other rules by a semi-colon.
+
+VMS fix to #includes in missing.c -- should we just be including awk.h?
+
+Updated README for texinfo.tex version.
+
+Updating of copyright in all .[chy] files.
+
+Added but commented out Michal's fix to strftime.
+
+Added tzset() emulation based on Rick Adams' code.  Added TZSET_MISSING to
+	config.h-dist.
+
+Added strftime.3 man page for missing_dir
+
+More posix:	func, **, **= don't work in -W posix
+
+More lint:	^, ^= not in old awk
+
+gawk.1:		removed ref to -DNO_DEV_FD, other minor updating.
+
+Style change:  pushbak becomes pushback() in yylex().
+
+Changes from 2.12.13 to 2.12.14
+-------------------------------
+
+Better (?) organization of awk.h -- attempt to keep all system dependencies
+  near the top and move some of the non-general things out of the config.h
+  files.
+
+Change to handling of SYSTEM_MISSING.
+
+Small change to ultrix config.
+
+Do "/dev/fd/*" etc. checking at runtime.
+
+First pass at VMS port.
+
+Improvements to error handling (when lexeme spans buffers).
+
+Fixed backslash handling -- why didn't I notice this sooner?
+
+Added programs from book to test suite and new target "bigtest" to Makefile.
+
+Changes from 2.12.12 to 2.12.13
+-------------------------------
+
+Recognize OFS and ORS specially so that OFS = 9 works without efficiency hit.
+  Took advantage of opportunity to tune do_print*() for about 10% win on a
+  print with 5 args (i.e. small but significant).
+
+Somewhat pervasive changes to reconcile CONVFMT vs. OFMT.
+
+Better initialization of builtin vars.
+
+Make config/* consistent wrt STRTOL_MISSING.
+
+Small portability improvement to alloca.s
+
+Improvements to lint code in awk.y
+
+Replaced strtol() with a better one by Chris Torek.
+
+Changes from 2.12.11 to 2.12.12
+-------------------------------
+
+Added PORTS file to record successful ports.
+
+Added #define const to nothing if not STDC and added const to strtod() header.
+
+Added * to printf capabilities and partially implemented ' ' and '+' (has an
+  effect for %d only, silently ignored for other formats).  I'm afraid that's
+  as far as I want to go before I look at a complete replacement for
+  do_sprintf().
+
+Added warning for /regexp/ on LHS of MATCHOP.
+
+Changes from 2.12.10 to 2.12.11
+-------------------------------
+
+Small Makefile improvements.
+
+Some remaining nits from the NeXT port.
+
+Got rid of bcopy() define in awk.h -- not needed anymore (??)
+
+Changed private in builtin.c -- it is special on Sequent.
+
+Added subset implementation of strtol() and STRTOL_MISSING.
+
+A little bit of cleanup in debug.c, dfa.c.
+
+Changes from 2.12.9 to 2.12.10
+------------------------------
+
+Redid compatability checking and checking for # of args.
+
+Removed all references to variables[] from outside awk.y, in preparation
+  for a more abstract interface to the symbol table.
+
+Got rid of a remaining use of bcopy() in regex.c.
+
+Changes from 2.12.8 to 2.12.9
+-----------------------------
+
+Portability improvements for atari, next and decstation.
+
+Bug fix in substr() -- wasn't handling 3rd arg. of -1 properly.
+
+Manpage updates.
+
+Moved support from src release to doc release.
+
+Updated FUTURES file.
+
+Added some "lint" warnings.
+
+Changes from 2.12.7 to 2.12.8
+-----------------------------
+
+Changed time() to systime().
+
+Changed warning() in snode() to fatal().
+
+strftime() now defaults second arg. to current time.
+
+Changes from 2.12.6 to 2.12.7
+-----------------------------
+
+Fixed bug in sub_common() involving inadequate allocation of a buffer.
+
+Added some missing files to the Makefile.
+
+Changes from 2.12.5 to 2.12.6
+-----------------------------
+
+Fixed bug wherein non-redirected getline could call iop_close() just
+  prior to a call from do_input().
+
+Fixed bug in handling of /dev/stdout and /dev/stderr.
+
+Changes from 2.12.4 to 2.12.5
+-----------------------------
+
+Updated README and support directory.
+
+Changes from 2.12.3 to 2.12.4
+-----------------------------
+
+Updated CHANGES and TODO (should have been done in previous 2 patches).
+
+Changes from 2.12.2 to 2.12.3
+-----------------------------
+
+Brought regex.c and alloca.s into line with current FSF versions.
+
+Changes from 2.12.1 to 2.12.2
+-----------------------------
+
+Portability improvements; mostly moving system prototypes out of awk.h
+
+Introduction of strftime.
+
+Use of CONVFMT.
+
+Changes from 2.12 to 2.12.1
+-----------------------------
+
+Consolidated treatment of command-line assignments (thus correcting the
+-v treatment).
+
+Rationalized builtin-variable handling into a table-driven process, thus
+simplifying variable() and eliminating spc_var().
+
+Fixed bug in handling of command-line source that ended in a newline.
+
+Simplified install() and lookup().
+
+Did away with double-mallocing of identifiers and now free second and later
+instances of a name, after the first gets installed into the symbol table.
+
+Treat IGNORECASE specially, simplifying a lot of code, and allowing
+checking against strict conformance only on setting it, rather than on each
+pattern match.
+
+Fixed regexp matching when IGNORECASE is non-zero (broken when dfa.c was 
+added).
+
+Fixed bug where $0 was not being marked as valid, even after it was rebuilt.
+This caused mangling of $0.
+
+
+Changes from 2.11.1 to 2.12
+-----------------------------
+
+Makefile:
+
+Portability improvements in Makefile.
+Move configuration stuff into config.h
+
+FSF files:
+
+Synchronized alloca.[cs] and regex.[ch] with FSF.
+
+array.c:
+
+Rationalized hash routines into one with a different algorithm.
+delete() now works if the array is a local variable.
+Changed interface of assoc_next() and avoided dereferencing past the end of the
+  array.
+
+awk.h:
+
+Merged non-prototype and prototype declarations in awk.h.
+Expanded tree_eval #define to short-circuit more calls of r_tree_eval().
+
+awk.y:
+
+Delinted some of the code in the grammar.
+Fixed and improved some of the error message printing.
+Changed to accomodate unlimited length source lines.
+Line continuation now works as advertised.
+Source lines can be arbitrarily long.
+Refined grammar hacks so that /= assignment works.  Regular expressions
+  starting with /= are recognized at the beginning of a line, after && or ||
+  and after ~ or !~.  More contexts can be added if necessary.
+Fixed IGNORECASE (multiple scans for backslash).
+Condensed expression_lists in array references.
+Detect and warn for correct # args in builtin functions -- call most of them
+  with a fixed number (i.e. fill in defaults at parse-time rather than at
+  run-time).
+Load ENVIRON only if it is referenced (detected at parse-time).
+Treat NF, FS, RS, NR, FNR specially at parse time, to improve run time.
+Fold constant expressions at parse time.
+Do make_regexp() on third arg. of split() at parse tiem if it is a constant.
+
+builtin.c:
+
+srand() returns 0 the first time called.
+Replaced alloca() with malloc() in do_sprintf().
+Fixed setting of RSTART and RLENGTH in do_match().
+Got rid of get_{one,two,three} and allowance for variable # of args. at
+  run-time -- this is now done at parse-time.
+Fixed latent bug in [g]sub whereby changes to $0 would never get made.
+Rewrote much of sub_common() for simplicity and performance.
+Added ctime() and time() builtin functions (unless -DSTRICT).  ctime() returns
+  a time string like the C function, given the number of seconds since the epoch
+  and time() returns the current time in seconds.
+do_sprintf() now checks for mismatch between format string and number of
+  arguments supplied.
+
+dfa.c
+
+This is borrowed (almost unmodified) from GNU grep to provide faster searches.
+
+eval.c
+
+Node_var, Node_var_array and Node_param_list handled from macro rather
+  than in r_tree_eval().
+Changed cmp_nodes() to not do a force_number() -- this, combined with a 
+    force_number() on ARGV[] and ENVIRON[] brings it into line with other awks
+Greatly simplified cmp_nodes().
+Separated out Node_NF, Node_FS, Node_RS, Node_NR and Node_FNR in get_lhs().
+All adjacent string concatenations now done at once.
+
+field.c
+
+Added support for FIELDWIDTHS.
+Fixed bug in get_field() whereby changes to a field were not always
+  properly reflected in $0.
+Reordered tests in parse_field() so that reference off the end of the buffer
+  doesn't happen.
+set_FS() now sets *parse_field i.e. routine to call depending on type of FS.
+It also does make_regexp() for FS if needed.  get_field() passes FS_regexp
+  to re_parse_field(), as does do_split().
+Changes to set_field() and set_record() to avoid malloc'ing and free'ing the
+  field nodes repeatedly.  The fields now just point into $0 unless they are
+  assigned to another variable or changed.  force_number() on the field is
+  *only* done when the field is needed.
+
+gawk.1
+
+Fixed troff formatting problem on .TP lines.
+
+io.c
+
+Moved some code out into iop.c.
+Output from pipes and system() calls is properly synchronized.
+Status from pipe close properly returned.
+Bug in getline with no redirect fixed.
+
+iop.c
+
+This file contains a totally revamped get_a_record and associated code.
+
+main.c
+
+Command line programs no longer use a temporary file.
+Therefore, tmpnam() no longer required.
+Deprecated -a and -e options -- they will go away in the next release,
+  but for now they cause a warning.
+Moved -C, -V, -c options to -W ala posix.
+Added -W posix option: throw out \x
+Added -W lint option.
+
+
+node.c
+
+force_number() now allows pure numerics to have leading whitespace.
+Added make_string facility to optimize case of adding an already malloc'd
+  string.
+Cleaned up and simplified do_deref().
+Fixed bug in handling of stref==255 in do_deref().
+
+re.c
+
+contains the interface to regexp code
+
+Changes from 2.11.1 to FSF version of same
+------------------------------------------
+Thu Jan  4 14:19:30 1990  Jim Kingdon  (kingdon at albert)
+
+	* Makefile (YACC): Add -y to bison part.
+
+	* missing.c: Add #include <stdio.h>.
+
+Sun Dec 24 16:16:05 1989  David J. MacKenzie  (djm at hobbes.ai.mit.edu)
+
+	* Makefile: Add (commented out) default defines for Sony News.
+
+	* awk.h: Move declaration of vprintf so it will compile when
+	-DVPRINTF_MISSING is defined.
+
+Mon Nov 13 18:54:08 1989  Robert J. Chassell  (bob at apple-gunkies.ai.mit.edu)
+
+        * gawk.texinfo: changed @-commands that are not part of the
+          standard, currently released texinfmt.el to those that are.
+          Otherwise, only people with the as-yet unreleased makeinfo.c can
+          format this file.
+
+Changes from 2.11beta to 2.11.1 (production)
+--------------------------------------------
+
+Went from "beta" to production status!!!
+
+Now flushes stdout before closing pipes or redirected files to
+synchronize output.
+
+MS-DOS changes added in.
+
+Signal handler return type parameterized in Makefile and awk.h and
+some lint removed.  debug.c cleaned up.
+
+Fixed FS splitting to never match null strings, per book.
+
+Correction to the manual's description of FS.
+
+Some compilers break on char *foo = "string" + 4 so fixed version.sh and
+main.c.
+
+Changes from 2.10beta to 2.11beta
+---------------------------------
+
+This release fixes all reported bugs that we could reproduce.  Probably
+some of the changes are not documented here.
+
+The next release will probably not be a beta release!
+
+The most important change is the addition of the -nostalgia option. :-)
+
+The documentation has been improved and brought up-to-date.
+
+There has been a lot of general cleaning up of the code that is not otherwise
+documented here.  There has been a movement toward using standard-conforming
+library routines and providing them (in missing.d) for systems lacking them.
+Improved (hopefully) configuration through Makfile modifications and missing.c.
+In particular, straightened out confusion over vprintf #defines, declarations
+etc.
+
+Deleted RCS log comments from source, to reduce source size by about one third.
+Most of them were horribly out-of-date, anyway.
+
+Renamed source files to reflect (for the most part) their contents.
+
+More and improved error messages.  Cleanup and fixes to yyerror().
+String constants are not altered in input buffer, so error messages come out 
+better.  Fixed usage message.  Make use of ANSI C strerror() function
+(provided).
+
+Plugged many more memory leaks.  The memory consumption is now quite
+reasonable over a wide range of programs.
+
+Uses volatile declaration if STDC > 0 to avoid problems due to longjmp.
+
+New -a and -e options to use awk or egrep style regexps, respectively,
+since POSIX says awk should use egrep regexps.  Default is -a.
+
+Added -v option for setting variables before the first file is encountered.
+Version information now uses -V and copyleft uses -C.
+
+Added a patchlevel.h file and its use for -V and -C.
+
+Append_right() optimized for major improvement to programs with a *lot*
+of statements.
+
+Operator precedence has been corrected to match draft Posix.
+
+Tightened up grammar for builtin functions so that only length
+may be called without arguments or parentheses.
+
+/regex/ is now a normal expression that can appear in any expression
+context.
+
+Allow /= to begin a regexp.  Allow ..[../..].. in a regexp.
+
+Allow empty compound statements ({}).
+
+Made return and next illegal outside a function and in BEGIN/END respectively.
+
+Division by zero is now illegal and causes a fatal error.
+
+Fixed exponentiation so that x ^ 0 and x ^= 0 both return 1.
+
+Fixed do_sqrt, do_log, and do_exp to do argument/return checking and
+print an error message, per the manual.
+
+Fixed main to catch SIGSEGV to get source and data file line numbers.
+
+Fixed yyerror to print the ^ at the beginning of the bad token, not the end.
+
+Fix to substr() builtin:  it was failing if the arguments
+weren't already strings.
+
+Added new node value flag NUMERIC to indicate that a variable is
+purely a number as opposed to type NUM which indicates that
+the node's numeric value is valid.  This is set in make_number(),
+tmp_number and r_force_number() when appropriate and used in
+cmp_nodes().  This fixed a bug in comparison of variables that had
+numeric prefixes.  The new code uses strtod() and eliminates is_a_number().
+A simple strtod() is provided for systems lacking one.  It does no
+overflow checking, so could be improved.
+
+Simplification and efficiency improvement in force_string.
+
+Added performance tweak in r_force_number().
+
+Fixed a bug with nested loops and break/continue in functions.
+
+Fixed inconsistency in handling of empty fields when $0 has to be rebuilt.
+Happens to simplify rebuild_record().
+
+Cleaned up the code associated with opening a pipe for reading.  Gawk
+now has its own popen routine (gawk_popen) that allocates an IOBUF
+and keeps track of the pid of the child process.  gawk_pclose
+marks the appropriate child as defunct in the right struct redirect.
+
+Cleaned up and fixed close_redir().
+
+Fixed an obscure bug to do with redirection.  Intermingled ">" and ">>"
+redirects did not output in a predictable order.
+
+Improved handling of output buffering:  now all print[f]s redirected to a tty
+or pipe are flushed immediately and non-redirected output to a tty is flushed
+before the next input record is read.
+
+Fixed a bug in get_a_record() where bcopy() could have copied over
+a random pointer.
+
+Fixed a bug when RS="" and records separated by multiple blank lines.
+
+Got rid of SLOWIO code which was out-of-date anyway.
+
+Fix in get_field() for case where $0 is changed and then $(n) are
+changed and then $0 is used.
+
+Fixed infinite loop on failure to open file for reading from getline.
+Now handles redirect file open failures properly.
+
+Filenames such as /dev/stdin now allowed on the command line as well as
+in redirects.
+
+Fixed so that gawk '$1' where $1 is a zero tests false.
+
+Fixed parsing so that `RLENGTH -1' parses the same as `RLENGTH - 1',
+for example.
+
+The return from a user-defined function now defaults to the Null node.
+This fixes a core-dump-causing bug when the return value  of a function
+is used and that function returns no value.
+
+Now catches floating point exceptions to avoid core dumps.
+
+Bug fix for deleting elements of an array -- under some conditions, it was
+deleting more than one element at a time.
+
+Fix in AWKPATH code for running off the end of the string.
+
+Fixed handling of precision in *printf calls.  %0.2d now works properly,
+as does %c.  [s]printf now recognizes %i and %X.
+
+Fixed a bug in printing of very large (>240) strings.
+
+Cleaned up erroneous behaviour for RS == "".
+
+Added IGNORECASE support to index().
+
+Simplified and fixed newnode/freenode.
+
+Fixed reference to $(anything) in a BEGIN block.
+
+Eliminated use of USG rand48().
+
+Bug fix in force_string for machines with 16-bit ints.
+
+Replaced use of mktemp() with tmpnam() and provided a partial implementation of
+the latter for systems that don't have it.
+
+Added a portability check for includes in io.c.
+
+Minor portability fix in alloc.c plus addition of xmalloc().
+
+Portability fix:  on UMAX4.2, st_blksize is zero for a pipe, thus breaking
+iop_alloc() -- fixed.
+
+Workaround for compiler bug on Sun386i in do_sprintf.
+
+More and improved prototypes in awk.h.
+
+Consolidated C escape parsing code into one place.
+
+strict flag is now turned on only when invoked with compatability option.
+It now applies to fewer things.
+
+Changed cast of f._ptr in vprintf.c from (unsigned char *) to (char *).
+Hopefully this is right for the systems that use this code (I don't).
+
+Support for pipes under MSDOS added.