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This file lists all bug fixes, changes, etc., made since the 
second edition of the AWK book was published in September 2023.

Apr 26, 2026
	regex fixes: limit the repetition count to 255 like
	POSIX does to prevent signed integer overflow.
	prevent a crash when the repetition is the first atom parsed
	Thanks to Renaud Allard an Todd Miller.

Dec 24, 2025
	Previously changed and broken rand() implementation
	restored in run.c with a variant thanks to Henry Spencer.

Aug 04, 2025
	Fix a syntax issue with /= that caused constants to
	turn into variables [eg. 42 /= 7]. Thanks to Arnold
	Robbins.

Jan 14, 2025
	Fix incorrect error line number issues. unput has
	no business managing lineno. Thanks to Ozan Yigit.

Jan 05, 2025
	Fix hex detection in is_valid_number.
	Fix indirect field specification with non-numeric string
	eg. $("foo") in indirect. This is not illegal.
	Thanks to Arnold Robbins.

Jan 01, 2025
	Fixed openfile to not try to read from a directory.
	Thanks to Arnold Robbins.

Jul 28, 2024
	Fixed readcsvrec resize segfault when reading csv records longer
	than 8k. Thanks to Ozan Yigit.
	mktime() added to bsd-features branch. Thanks to Todd Miller.

Jun 23, 2024
	Fix signal for system-status test. Thanks to Tim van der Molen.
	Rewrite if-else chain as switch. Thanks to Andrew Sukach.

May 27, 2024
	Spelling fixes and removal of unneeded prototypes and extern.
	Thanks to Jonathan Gray.

May 4, 2024
	Fixed a use-after-free bug with ARGV for "delete ARGV".
	Also ENVtab is no longer global. Thanks to Benjamin Sturz
	for spotting the ARGV issue and	Todd Miller for the fix. 

May 3, 2024:
	Remove warnings when compiling with g++. Thanks to Arnold Robbins.

Apr 22, 2024:
	Fixed regex engine gototab reallocation issue that was
	Introduced during the Nov 24 rewrite. Thanks to Arnold Robbins.
	Fixed a scan bug in split in the case the separator is a single
	character. Thanks to Oguz Ismail for spotting the issue.

Mar 10, 2024:
	Fixed use-after-free bug in fnematch due to adjbuf invalidating
	the pointers to buf. Thanks to github user caffe3 for spotting
	the issue and providing a fix, and to Miguel Pineiro Jr.
	for the alternative fix.
	MAX_UTF_BYTES in fnematch has been replaced with awk_mb_cur_max.
	thanks to Miguel Pineiro Jr.

Jan 22, 2024:
	Restore the ability to compile with g++. Thanks to
	Arnold Robbins.

Dec 24, 2023:
	Matchop dereference after free problem fix when the first
	argument is a function call. Thanks to Oguz Ismail Uysal.
	Fix inconsistent handling of --csv and FS set in the
	command line. Thanks to Wilbert van der Poel.
	Casting changes to int for is* functions. 

Nov 27, 2023:
	Fix exit status of system on MacOS. Update to REGRESS.
	Thanks to Arnold Robbins. 
	Fix inconsistent handling of -F and --csv, and loss of csv
	mode when FS is set. 
	
Nov 24, 2023:
        Fix issue #199: gototab improvements to dynamically resize the
        table, qsort and bsearch to improve the lookup speed as the
        table gets larger for multibyte input. Thanks to Arnold Robbins.

Nov 23, 2023:
	Fix Issue #169, related to escape sequences in strings.
	Thanks to Github user rajeevvp.
	Fix Issue #147, reported by Github user drawkula, and fixed
	by Miguel Pineiro Jr.

Nov 20, 2023:
	Rewrite of fnematch to fix a number of issues, including
	extraneous output, out-of-bounds access, number of bytes
	to push back after a failed match etc.
	Thanks to Miguel Pineiro Jr.

Nov 15, 2023:
	Man page edit, regression test fixes. Thanks to Arnold Robbins
	Consolidation of sub and gsub into dosub, removing duplicate
	code. Thanks to Miguel Pineiro Jr.
	gcc replaced with cc everywhere.

Oct 30, 2023:
	Multiple fixes and a minor code cleanup.
	Disabled utf-8 for non-multibyte locales, such as C or POSIX.
	Fixed a bad char * cast that causes incorrect results on big-endian
	systems. Also fixed an out-of-bounds read for empty CCL.
	Fixed a buffer overflow in substr with utf-8 strings.
	Many thanks to Todd C Miller.

Sep 24, 2023:
	fnematch and getrune have been overhauled to solve issues around
	unicode FS and RS. Also fixed gsub null match issue with unicode.
	Big thanks to Arnold Robbins.

Sep 12, 2023:
	Fixed a length error in u8_byte2char that set RSTART to
	incorrect (cannot happen) value for EOL match(str, /$/).


-----------------------------------------------------------------

[This entry is a summary, not a precise list of changes.]

	Added --csv option to enable processing of comma-separated
	values inputs.  When --csv is enabled, fields are separated
	by commas, fields may be quoted with " double quotes, fields
	may contain embedded newlines.

	If no explicit separator argument is provided, split() uses
	the setting of --csv to determine how fields are split.

	Strings may now contain UTF-8 code points (not necessarily
	characters).  Functions that operate on characters, like
	length, substr, index, match, etc., use UTF-8, so the length
	of a string of 3 emojis is 3, not 12 as it would be if bytes
	were counted.

	Regular expressions are processed as UTF-8.

	Unicode literals can be written as \u followed by one
	to eight hexadecimal digits.  These may appear in strings and
	regular expressions.
