| blob | c78aabc511f315b6d11952617e0146b748343752 |
1 /****************************************************************
2 Copyright (C) Lucent Technologies 1997
3 All Rights Reserved
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.
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 ****************************************************************/
25 This file lists all bug fixes, changes, etc., made since the AWK book
26 was sent to the printers in August, 1987.
28 Dec 20, 2012:
29 fiddled makefile to get correct yacc and bison flags. pick yacc
30 (linux) or bison (mac) as necessary.
32 added __attribute__((__noreturn__)) to a couple of lines in
33 proto.h, to silence someone's enthusiastic checker.
35 fixed obscure call by value bug in split(a[1],a) reported on
36 9fans. the management of temporary values is just a mess; i
37 took a shortcut by making an extra string copy. thanks
38 to paul patience and arnold robbins for passing it on and for
39 proposed patches.
41 tiny fiddle in setfval to eliminate -0 results in T.expr, which
42 has irritated me for 20+ years.
44 Aug 10, 2011:
45 another fix to avoid core dump with delete(ARGV); again, many thanks
46 to ruslan ermilov.
48 Aug 7, 2011:
49 split(s, a, //) now behaves the same as split(s, a, "")
51 Jun 12, 2011:
52 /pat/, \n /pat/ {...} is now legal, though bad style to use.
54 added checks to new -v code that permits -vnospace; thanks to
55 ruslan ermilov for spotting this and providing the patch.
57 removed fixed limit on number of open files; thanks to aleksey
58 cheusov and christos zoulos.
60 fixed day 1 bug that resurrected deleted elements of ARGV when
61 used as filenames (in lib.c).
63 minor type fiddles to make gcc -Wall -pedantic happier (but not
64 totally so); turned on -fno-strict-aliasing in makefile.
66 May 6, 2011:
67 added #ifdef for isblank.
68 now allows -ffoo as well as -f foo arguments.
69 (thanks, ruslan)
71 May 1, 2011:
72 after advice from todd miller, kevin lo, ruslan ermilov,
73 and arnold robbins, changed srand() to return the previous
74 seed (which is 1 on the first call of srand). the seed is
75 an Awkfloat internally though converted to unsigned int to
76 pass to the library srand(). thanks, everyone.
78 fixed a subtle (and i hope low-probability) overflow error
79 in fldbld, by adding space for one extra \0. thanks to
80 robert bassett for spotting this one and providing a fix.
82 removed the files related to compilation on windows. i no
83 longer have anything like a current windows environment, so
84 i can't test any of it.
86 May 23, 2010:
87 fixed long-standing overflow bug in run.c; many thanks to
88 nelson beebe for spotting it and providing the fix.
90 fixed bug that didn't parse -vd=1 properly; thanks to santiago
91 vila for spotting it.
93 Feb 8, 2010:
94 i give up. replaced isblank with isspace in b.c; there are
95 no consistent header files.
97 Nov 26, 2009:
98 fixed a long-standing issue with when FS takes effect. a
99 change to FS is now noticed immediately for subsequent splits.
101 changed the name getline() to awkgetline() to avoid yet another
102 name conflict somewhere.
104 Feb 11, 2009:
105 temporarily for now defined HAS_ISBLANK, since that seems to
106 be the best way through the thicket. isblank arrived in C99,
107 but seems to be arriving at different systems at different
108 times.
110 Oct 8, 2008:
111 fixed typo in b.c that set tmpvec wrongly. no one had ever
112 run into the problem, apparently. thanks to alistair crooks.
114 Oct 23, 2007:
115 minor fix in lib.c: increase inputFS to 100, change malloc
116 for fields to n+1.
118 fixed memory fault caused by out of order test in setsval.
120 thanks to david o'brien, freebsd, for both fixes.
122 May 1, 2007:
123 fiddle in makefile to fix for BSD make; thanks to igor sobrado.
125 Mar 31, 2007:
126 fixed some null pointer refs calling adjbuf.
128 Feb 21, 2007:
129 fixed a bug in matching the null RE in sub and gsub. thanks to al aho
130 who actually did the fix (in b.c), and to wolfgang seeberg for finding
131 it and providing a very compact test case.
133 fixed quotation in b.c; thanks to Hal Pratt and the Princeton Dante
134 Project.
136 removed some no-effect asserts in run.c.
138 fiddled maketab.c to not complain about bison-generated values.
140 removed the obsolete -V argument; fixed --version to print the
141 version and exit.
143 fixed wording and an outright error in the usage message; thanks to igor
144 sobrado and jason mcintyre.
146 fixed a bug in -d that caused core dump if no program followed.
148 Jan 1, 2007:
149 dropped mac.code from makefile; there are few non-MacOSX
150 mac's these days.
152 Jan 17, 2006:
153 system() not flagged as unsafe in the unadvertised -safe option.
154 found it while enhancing tests before shipping the ;login: article.
155 practice what you preach.
157 removed the 9-years-obsolete -mr and -mf flags.
159 added -version and --version options.
161 core dump on linux with BEGIN {nextfile}, now fixed.
163 removed some #ifdef's in run.c and lex.c that appear to no
164 longer be necessary.
166 Apr 24, 2005:
167 modified lib.c so that values of $0 et al are preserved in the END
168 block, apparently as required by posix. thanks to havard eidnes
169 for the report and code.
171 Jan 14, 2005:
172 fixed infinite loop in parsing, originally found by brian tsang.
173 thanks to arnold robbins for a suggestion that started me
174 rethinking it.
176 Dec 31, 2004:
177 prevent overflow of -f array in main, head off potential error in
178 call of SYNTAX(), test malloc return in lib.c, all with thanks to
179 todd miller.
181 Dec 22, 2004:
182 cranked up size of NCHARS; coverity thinks it can be overrun with
183 smaller size, and i think that's right. added some assertions to b.c
184 to catch places where it might overrun. the RE code is still fragile.
186 Dec 5, 2004:
187 fixed a couple of overflow problems with ridiculous field numbers:
188 e.g., print $(2^32-1). thanks to ruslan ermilov, giorgos keramidas
189 and david o'brien at freebsd.org for patches. this really should
190 be re-done from scratch.
192 Nov 21, 2004:
193 fixed another 25-year-old RE bug, in split. it's another failure
194 to (re-)initialize. thanks to steve fisher for spotting this and
195 providing a good test case.
197 Nov 22, 2003:
198 fixed a bug in regular expressions that dates (so help me) from 1977;
199 it's been there from the beginning. an anchored longest match that
200 was longer than the number of states triggered a failure to initialize
201 the machine properly. many thanks to moinak ghosh for not only finding
202 this one but for providing a fix, in some of the most mysterious
203 code known to man.
205 fixed a storage leak in call() that appears to have been there since
206 1983 or so -- a function without an explicit return that assigns a
207 string to a parameter leaked a Cell. thanks to moinak ghosh for
208 spotting this very subtle one.
210 Jul 31, 2003:
211 fixed, thanks to andrey chernov and ruslan ermilov, a bug in lex.c
212 that mis-handled the character 255 in input. (it was being compared
213 to EOF with a signed comparison.)
215 Jul 29, 2003:
216 fixed (i think) the long-standing botch that included the beginning of
217 line state ^ for RE's in the set of valid characters; this led to a
218 variety of odd problems, including failure to properly match certain
219 regular expressions in non-US locales. thanks to ruslan for keeping
220 at this one.
222 Jul 28, 2003:
223 n-th try at getting internationalization right, with thanks to volker
224 kiefel, arnold robbins and ruslan ermilov for advice, though they
225 should not be blamed for the outcome. according to posix, "." is the
226 radix character in programs and command line arguments regardless of
227 the locale; otherwise, the locale should prevail for input and output
228 of numbers. so it's intended to work that way.
230 i have rescinded the attempt to use strcoll in expanding shorthands in
231 regular expressions (cclenter). its properties are much too
232 surprising; for example [a-c] matches aAbBc in locale en_US but abBcC
233 in locale fr_CA. i can see how this might arise by implementation
234 but i cannot explain it to a human user. (this behavior can be seen
235 in gawk as well; we're leaning on the same library.)
237 the issue appears to be that strcoll is meant for sorting, where
238 merging upper and lower case may make sense (though note that unix
239 sort does not do this by default either). it is not appropriate
240 for regular expressions, where the goal is to match specific
241 patterns of characters. in any case, the notations [:lower:], etc.,
242 are available in awk, and they are more likely to work correctly in
243 most locales.
245 a moratorium is hereby declared on internationalization changes.
246 i apologize to friends and colleagues in other parts of the world.
247 i would truly like to get this "right", but i don't know what
248 that is, and i do not want to keep making changes until it's clear.
250 Jul 4, 2003:
251 fixed bug that permitted non-terminated RE, as in "awk /x".
253 Jun 1, 2003:
254 subtle change to split: if source is empty, number of elems
255 is always 0 and the array is not set.
257 Mar 21, 2003:
258 added some parens to isblank, in another attempt to make things
259 internationally portable.
261 Mar 14, 2003:
262 the internationalization changes, somewhat modified, are now
263 reinstated. in theory awk will now do character comparisons
264 and case conversions in national language, but "." will always
265 be the decimal point separator on input and output regardless
266 of national language. isblank(){} has an #ifndef.
268 this no longer compiles on windows: LC_MESSAGES isn't defined
269 in vc6++.
271 fixed subtle behavior in field and record splitting: if FS is
272 a single character and RS is not empty, \n is NOT a separator.
273 this tortuous reading is found in the awk book; behavior now
274 matches gawk and mawk.
276 Dec 13, 2002:
277 for the moment, the internationalization changes of nov 29 are
278 rolled back -- programs like x = 1.2 don't work in some locales,
279 because the parser is expecting x = 1,2. until i understand this
280 better, this will have to wait.
282 Nov 29, 2002:
283 modified b.c (with tiny changes in main and run) to support
284 locales, using strcoll and iswhatever tests for posix character
285 classes. thanks to ruslan ermilov (ru@freebsd.org) for code.
286 the function isblank doesn't seem to have propagated to any
287 header file near me, so it's there explicitly. not properly
288 tested on non-ascii character sets by me.
290 Jun 28, 2002:
291 modified run/format() and tran/getsval() to do a slightly better
292 job on using OFMT for output from print and CONVFMT for other
293 number->string conversions, as promised by posix and done by
294 gawk and mawk. there are still places where it doesn't work
295 right if CONVFMT is changed; by then the STR attribute of the
296 variable has been irrevocably set. thanks to arnold robbins for
297 code and examples.
299 fixed subtle bug in format that could get core dump. thanks to
300 Jaromir Dolecek <jdolecek@NetBSD.org> for finding and fixing.
301 minor cleanup in run.c / format() at the same time.
303 added some tests for null pointers to debugging printf's, which
304 were never intended for external consumption. thanks to dave
305 kerns (dkerns@lucent.com) for pointing this out.
307 GNU compatibility: an empty regexp matches anything (thanks to
308 dag-erling smorgrav, des@ofug.org). subject to reversion if
309 this does more harm than good.
311 pervasive small changes to make things more const-correct, as
312 reported by gcc's -Wwrite-strings. as it says in the gcc manual,
313 this may be more nuisance than useful. provoked by a suggestion
314 and code from arnaud desitter, arnaud@nimbus.geog.ox.ac.uk
316 minor documentation changes to note that this now compiles out
317 of the box on Mac OS X.
319 Feb 10, 2002:
320 changed types in posix chars structure to quiet solaris cc.
322 Jan 1, 2002:
323 fflush() or fflush("") flushes all files and pipes.
325 length(arrayname) returns number of elements; thanks to
326 arnold robbins for suggestion.
328 added a makefile.win to make it easier to build on windows.
329 based on dan allen's buildwin.bat.
331 Nov 16, 2001:
332 added support for posix character class names like [:digit:],
333 which are not exactly shorter than [0-9] and perhaps no more
334 portable. thanks to dag-erling smorgrav for code.
336 Feb 16, 2001:
337 removed -m option; no longer needed, and it was actually
338 broken (noted thanks to volker kiefel).
340 Feb 10, 2001:
341 fixed an appalling bug in gettok: any sequence of digits, +,-, E, e,
342 and period was accepted as a valid number if it started with a period.
343 this would never have happened with the lex version.
345 other 1-character botches, now fixed, include a bare $ and a
346 bare " at the end of the input.
348 Feb 7, 2001:
349 more (const char *) casts in b.c and tran.c to silence warnings.
351 Nov 15, 2000:
352 fixed a bug introduced in august 1997 that caused expressions
353 like $f[1] to be syntax errors. thanks to arnold robbins for
354 noticing this and providing a fix.
356 Oct 30, 2000:
357 fixed some nextfile bugs: not handling all cases. thanks to
358 arnold robbins for pointing this out. new regressions added.
360 close() is now a function. it returns whatever the library
361 fclose returns, and -1 for closing a file or pipe that wasn't
362 opened.
364 Sep 24, 2000:
365 permit \n explicitly in character classes; won't work right
366 if comes in as "[\n]" but ok as /[\n]/, because of multiple
367 processing of \'s. thanks to arnold robbins.
369 July 5, 2000:
370 minor fiddles in tran.c to keep compilers happy about uschar.
371 thanks to norman wilson.
373 May 25, 2000:
374 yet another attempt at making 8-bit input work, with another
375 band-aid in b.c (member()), and some (uschar) casts to head
376 off potential errors in subscripts (like isdigit). also
377 changed HAT to NCHARS-2. thanks again to santiago vila.
379 changed maketab.c to ignore apparently out of range definitions
380 instead of halting; new freeBSD generates one. thanks to
381 jon snader <jsnader@ix.netcom.com> for pointing out the problem.
383 May 2, 2000:
384 fixed an 8-bit problem in b.c by making several char*'s into
385 unsigned char*'s. not clear i have them all yet. thanks to
386 Santiago Vila <sanvila@unex.es> for the bug report.
388 Apr 21, 2000:
389 finally found and fixed a memory leak in function call; it's
390 been there since functions were added ~1983. thanks to
391 jon bentley for the test case that found it.
393 added test in envinit to catch environment "variables" with
394 names beginning with '='; thanks to Berend Hasselman.
396 Jul 28, 1999:
397 added test in defn() to catch function foo(foo), which
398 otherwise recurses until core dump. thanks to arnold
399 robbins for noticing this.
401 Jun 20, 1999:
402 added *bp in gettok in lex.c; appears possible to exit function
403 without terminating the string. thanks to russ cox.
405 Jun 2, 1999:
406 added function stdinit() to run to initialize files[] array,
407 in case stdin, etc., are not constants; some compilers care.
409 May 10, 1999:
410 replaced the ERROR ... FATAL, etc., macros with functions
411 based on vprintf, to avoid problems caused by overrunning
412 fixed-size errbuf array. thanks to ralph corderoy for the
413 impetus, and for pointing out a string termination bug in
414 qstring as well.
416 Apr 21, 1999:
417 fixed bug that caused occasional core dumps with commandline
418 variable with value ending in \. (thanks to nelson beebe for
419 the test case.)
421 Apr 16, 1999:
422 with code kindly provided by Bruce Lilly, awk now parses
423 /=/ and similar constructs more sensibly in more places.
424 Bruce also provided some helpful test cases.
426 Apr 5, 1999:
427 changed true/false to True/False in run.c to make it
428 easier to compile with C++. Added some casts on malloc
429 and realloc to be honest about casts; ditto. changed
430 ltype int to long in struct rrow to reduce some 64-bit
431 complaints; other changes scattered throughout for the
432 same purpose. thanks to Nelson Beebe for these portability
433 improvements.
435 removed some horrible pointer-int casting in b.c and elsewhere
436 by adding ptoi and itonp to localize the casts, which are
437 all benign. fixed one incipient bug that showed up on sgi
438 in 64-bit mode.
440 reset lineno for new source file; include filename in error
441 message. also fixed line number error in continuation lines.
442 (thanks to Nelson Beebe for both of these.)
444 Mar 24, 1999:
445 Nelson Beebe notes that irix 5.3 yacc dies with a bogus
446 error; use a newer version or switch to bison, since sgi
447 is unlikely to fix it.
449 Mar 5, 1999:
450 changed isnumber to is_number to avoid the problem caused by
451 versions of ctype.h that include the name isnumber.
453 distribution now includes a script for building on a Mac,
454 thanks to Dan Allen.
456 Feb 20, 1999:
457 fixed memory leaks in run.c (call) and tran.c (setfval).
458 thanks to Stephen Nutt for finding these and providing the fixes.
460 Jan 13, 1999:
461 replaced srand argument by (unsigned int) in run.c;
462 avoids problem on Mac and potentially on Unix & Windows.
463 thanks to Dan Allen.
465 added a few (int) casts to silence useless compiler warnings.
466 e.g., errorflag= in run.c jump().
468 added proctab.c to the bundle outout; one less thing
469 to have to compile out of the box.
471 added calls to _popen and _pclose to the win95 stub for
472 pipes (thanks to Steve Adams for this helpful suggestion).
473 seems to work, though properties are not well understood
474 by me, and it appears that under some circumstances the
475 pipe output is truncated. Be careful.
477 Oct 19, 1998:
478 fixed a couple of bugs in getrec: could fail to update $0
479 after a getline var; because inputFS wasn't initialized,
480 could split $0 on every character, a misleading diversion.
482 fixed caching bug in makedfa: LRU was actually removing
483 least often used.
485 thanks to ross ridge for finding these, and for providing
486 great bug reports.
488 May 12, 1998:
489 fixed potential bug in readrec: might fail to update record
490 pointer after growing. thanks to dan levy for spotting this
491 and suggesting the fix.
493 Mar 12, 1998:
494 added -V to print version number and die.
496 Feb 11, 1998:
497 subtle silent bug in lex.c: if the program ended with a number
498 longer than 1 digit, part of the input would be pushed back and
499 parsed again because token buffer wasn't terminated right.
500 example: awk 'length($0) > 10'. blush. at least i found it
501 myself.
503 Aug 31, 1997:
504 s/adelete/awkdelete/: SGI uses this in malloc.h.
505 thanks to nelson beebe for pointing this one out.
507 Aug 21, 1997:
508 fixed some bugs in sub and gsub when replacement includes \\.
509 this is a dark, horrible corner, but at least now i believe that
510 the behavior is the same as gawk and the intended posix standard.
511 thanks to arnold robbins for advice here.
513 Aug 9, 1997:
514 somewhat regretfully, replaced the ancient lex-based lexical
515 analyzer with one written in C. it's longer, generates less code,
516 and more portable; the old one depended too much on mysterious
517 properties of lex that were not preserved in other environments.
518 in theory these recognize the same language.
520 now using strtod to test whether a string is a number, instead of
521 the convoluted original function. should be more portable and
522 reliable if strtod is implemented right.
524 removed now-pointless optimization in makefile that tries to avoid
525 recompilation when awkgram.y is changed but symbols are not.
527 removed most fixed-size arrays, though a handful remain, some
528 of which are unchecked. you have been warned.
530 Aug 4, 1997:
531 with some trepidation, replaced the ancient code that managed
532 fields and $0 in fixed-size arrays with arrays that grow on
533 demand. there is still some tension between trying to make this
534 run fast and making it clean; not sure it's right yet.
536 the ill-conceived -mr and -mf arguments are now useful only
537 for debugging. previous dynamic string code removed.
539 numerous other minor cleanups along the way.
541 Jul 30, 1997:
542 using code provided by dan levy (to whom profuse thanks), replaced
543 fixed-size arrays and awkward kludges by a fairly uniform mechanism
544 to grow arrays as needed for printf, sub, gsub, etc.
546 Jul 23, 1997:
547 falling off the end of a function returns "" and 0, not 0.
548 thanks to arnold robbins.
550 Jun 17, 1997:
551 replaced several fixed-size arrays by dynamically-created ones
552 in run.c; added overflow tests to some previously unchecked cases.
553 getline, toupper, tolower.
555 getline code is still broken in that recursive calls may wind
556 up using the same space. [fixed later]
558 increased RECSIZE to 8192 to push problems further over the horizon.
560 added \r to \n as input line separator for programs, not data.
561 damn CRLFs.
563 modified format() to permit explicit printf("%c", 0) to include
564 a null byte in output. thanks to ken stailey for the fix.
566 added a "-safe" argument that disables file output (print >,
567 print >>), process creation (cmd|getline, print |, system), and
568 access to the environment (ENVIRON). this is a first approximation
569 to a "safe" version of awk, but don't rely on it too much. thanks
570 to joan feigenbaum and matt blaze for the inspiration long ago.
572 Jul 8, 1996:
573 fixed long-standing bug in sub, gsub(/a/, "\\\\&"); thanks to
574 ralph corderoy.
576 Jun 29, 1996:
577 fixed awful bug in new field splitting; didn't get all the places
578 where input was done.
580 Jun 28, 1996:
581 changed field-splitting to conform to posix definition: fields are
582 split using the value of FS at the time of input; it used to be
583 the value when the field or NF was first referred to, a much less
584 predictable definition. thanks to arnold robbins for encouragement
585 to do the right thing.
587 May 28, 1996:
588 fixed appalling but apparently unimportant bug in parsing octal
589 numbers in reg exprs.
591 explicit hex in reg exprs now limited to 2 chars: \xa, \xaa.
593 May 27, 1996:
594 cleaned up some declarations so gcc -Wall is now almost silent.
596 makefile now includes backup copies of ytab.c and lexyy.c in case
597 one makes before looking; it also avoids recreating lexyy.c unless
598 really needed.
600 s/aprintf/awkprint, s/asprintf/awksprintf/ to avoid some name clashes
601 with unwisely-written header files.
603 thanks to jeffrey friedl for several of these.
605 May 26, 1996:
606 an attempt to rationalize the (unsigned) char issue. almost all
607 instances of unsigned char have been removed; the handful of places
608 in b.c where chars are used as table indices have been hand-crafted.
609 added some latin-1 tests to the regression, but i'm not confident;
610 none of my compilers seem to care much. thanks to nelson beebe for
611 pointing out some others that do care.
613 May 2, 1996:
614 removed all register declarations.
616 enhanced split(), as in gawk, etc: split(s, a, "") splits s into
617 a[1]...a[length(s)] with each character a single element.
619 made the same changes for field-splitting if FS is "".
621 added nextfile, as in gawk: causes immediate advance to next
622 input file. (thanks to arnold robbins for inspiration and code).
624 small fixes to regexpr code: can now handle []], [[], and
625 variants; [] is now a syntax error, rather than matching
626 everything; [z-a] is now empty, not z. far from complete
627 or correct, however. (thanks to jeffrey friedl for pointing out
628 some awful behaviors.)
630 Apr 29, 1996:
631 replaced uchar by uschar everywhere; apparently some compilers
632 usurp this name and this causes conflicts.
634 fixed call to time in run.c (bltin); arg is time_t *.
636 replaced horrible pointer/long punning in b.c by a legitimate
637 union. should be safer on 64-bit machines and cleaner everywhere.
638 (thanks to nelson beebe for pointing out some of these problems.)
640 replaced nested comments by #if 0...#endif in run.c, lib.c.
642 removed getsval, setsval, execute macros from run.c and lib.c.
643 machines are 100x faster than they were when these macros were
644 first used.
646 revised filenames: awk.g.y => awkgram.y, awk.lx.l => awklex.l,
647 y.tab.[ch] => ytab.[ch], lex.yy.c => lexyy.c, all in the aid of
648 portability to nameless systems.
650 "make bundle" now includes yacc and lex output files for recipients
651 who don't have yacc or lex.
653 Aug 15, 1995:
654 initialized Cells in setsymtab more carefully; some fields
655 were not set. (thanks to purify, all of whose complaints i
656 think i now understand.)
658 fixed at least one error in gsub that looked at -1-th element
659 of an array when substituting for a null match (e.g., $).
661 delete arrayname is now legal; it clears the elements but leaves
662 the array, which may not be the right behavior.
664 modified makefile: my current make can't cope with the test used
665 to avoid unnecessary yacc invocations.
667 Jul 17, 1995:
668 added dynamically growing strings to awk.lx.l and b.c
669 to permit regular expressions to be much bigger.
670 the state arrays can still overflow.
672 Aug 24, 1994:
673 detect duplicate arguments in function definitions (mdm).
675 May 11, 1994:
676 trivial fix to printf to limit string size in sub().
678 Apr 22, 1994:
679 fixed yet another subtle self-assignment problem:
680 $1 = $2; $1 = $1 clobbered $1.
682 Regression tests now use private echo, to avoid quoting problems.
684 Feb 2, 1994:
685 changed error() to print line number as %d, not %g.
687 Jul 23, 1993:
688 cosmetic changes: increased sizes of some arrays,
689 reworded some error messages.
691 added CONVFMT as in posix (just replaced OFMT in getsval)
693 FILENAME is now "" until the first thing that causes a file
694 to be opened.
696 Nov 28, 1992:
697 deleted yyunput and yyoutput from proto.h;
698 different versions of lex give these different declarations.
700 May 31, 1992:
701 added -mr N and -mf N options: more record and fields.
702 these really ought to adjust automatically.
704 cleaned up some error messages; "out of space" now means
705 malloc returned NULL in all cases.
707 changed rehash so that if it runs out, it just returns;
708 things will continue to run slow, but maybe a bit longer.
710 Apr 24, 1992:
711 remove redundant close of stdin when using -f -.
713 got rid of core dump with -d; awk -d just prints date.
715 Apr 12, 1992:
716 added explicit check for /dev/std(in,out,err) in redirection.
717 unlike gawk, no /dev/fd/n yet.
719 added (file/pipe) builtin. hard to test satisfactorily.
720 not posix.
722 Feb 20, 1992:
723 recompile after abortive changes; should be unchanged.
725 Dec 2, 1991:
726 die-casting time: converted to ansi C, installed that.
728 Nov 30, 1991:
729 fixed storage leak in freefa, failing to recover [N]CCL.
730 thanks to Bill Jones (jones@cs.usask.ca)
732 Nov 19, 1991:
733 use RAND_MAX instead of literal in builtin().
735 Nov 12, 1991:
736 cranked up some fixed-size arrays in b.c, and added a test for
737 overflow in penter. thanks to mark larsen.
739 Sep 24, 1991:
740 increased buffer in gsub. a very crude fix to a general problem.
741 and again on Sep 26.
743 Aug 18, 1991:
744 enforce variable name syntax for commandline variables: has to
745 start with letter or _.
747 Jul 27, 1991:
748 allow newline after ; in for statements.
750 Jul 21, 1991:
751 fixed so that in self-assignment like $1=$1, side effects
752 like recomputing $0 take place. (this is getting subtle.)
754 Jun 30, 1991:
755 better test for detecting too-long output record.
757 Jun 2, 1991:
758 better defense against very long printf strings.
759 made break and continue illegal outside of loops.
761 May 13, 1991:
762 removed extra arg on gettemp, tempfree. minor error message rewording.
764 May 6, 1991:
765 fixed silly bug in hex parsing in hexstr().
766 removed an apparently unnecessary test in isnumber().
767 warn about weird printf conversions.
768 fixed unchecked array overwrite in relex().
770 changed for (i in array) to access elements in sorted order.
771 then unchanged it -- it really does run slower in too many cases.
772 left the code in place, commented out.
774 Feb 10, 1991:
775 check error status on all writes, to avoid banging on full disks.
777 Jan 28, 1991:
778 awk -f - reads the program from stdin.
780 Jan 11, 1991:
781 failed to set numeric state on $0 in cmd|getline context in run.c.
783 Nov 2, 1990:
784 fixed sleazy test for integrality in getsval; use modf.
786 Oct 29, 1990:
787 fixed sleazy buggy code in lib.c that looked (incorrectly) for
788 too long input lines.
790 Oct 14, 1990:
791 fixed the bug on p. 198 in which it couldn't deduce that an
792 argument was an array in some contexts. replaced the error
793 message in intest() by code that damn well makes it an array.
795 Oct 8, 1990:
796 fixed horrible bug: types and values were not preserved in
797 some kinds of self-assignment. (in assign().)
799 Aug 24, 1990:
800 changed NCHARS to 256 to handle 8-bit characters in strings
801 presented to match(), etc.
803 Jun 26, 1990:
804 changed struct rrow (awk.h) to use long instead of int for lval,
805 since cfoll() stores a pointer in it. now works better when int's
806 are smaller than pointers!
808 May 6, 1990:
809 AVA fixed the grammar so that ! is uniformly of the same precedence as
810 unary + and -. This renders illegal some constructs like !x=y, which
811 now has to be parenthesized as !(x=y), and makes others work properly:
812 !x+y is (!x)+y, and x!y is x !y, not two pattern-action statements.
813 (These problems were pointed out by Bob Lenk of Posix.)
815 Added \x to regular expressions (already in strings).
816 Limited octal to octal digits; \8 and \9 are not octal.
817 Centralized the code for parsing escapes in regular expressions.
818 Added a bunch of tests to T.re and T.sub to verify some of this.
820 Feb 9, 1990:
821 fixed null pointer dereference bug in main.c: -F[nothing]. sigh.
823 restored srand behavior: it returns the current seed.
825 Jan 18, 1990:
826 srand now returns previous seed value (0 to start).
828 Jan 5, 1990:
829 fix potential problem in tran.c -- something was freed,
830 then used in freesymtab.
832 Oct 18, 1989:
833 another try to get the max number of open files set with
834 relatively machine-independent code.
836 small fix to input() in case of multiple reads after EOF.
838 Oct 11, 1989:
839 FILENAME is now defined in the BEGIN block -- too many old
840 programs broke.
842 "-" means stdin in getline as well as on the commandline.
844 added a bunch of casts to the code to tell the truth about
845 char * vs. unsigned char *, a right royal pain. added a
846 setlocale call to the front of main, though probably no one
847 has it usefully implemented yet.
849 Aug 24, 1989:
850 removed redundant relational tests against nullnode if parse
851 tree already had a relational at that point.
853 Aug 11, 1989:
854 fixed bug: commandline variable assignment has to look like
855 var=something. (consider the man page for =, in file =.1)
857 changed number of arguments to functions to static arrays
858 to avoid repeated malloc calls.
860 Aug 2, 1989:
861 restored -F (space) separator
863 Jul 30, 1989:
864 added -v x=1 y=2 ... for immediate commandline variable assignment;
865 done before the BEGIN block for sure. they have to precede the
866 program if the program is on the commandline.
867 Modified Aug 2 to require a separate -v for each assignment.
869 Jul 10, 1989:
870 fixed ref-thru-zero bug in environment code in tran.c
872 Jun 23, 1989:
873 add newline to usage message.
875 Jun 14, 1989:
876 added some missing ansi printf conversion letters: %i %X %E %G.
877 no sensible meaning for h or L, so they may not do what one expects.
879 made %* conversions work.
881 changed x^y so that if n is a positive integer, it's done
882 by explicit multiplication, thus achieving maximum accuracy.
883 (this should be done by pow() but it seems not to be locally.)
884 done to x ^= y as well.
886 Jun 4, 1989:
887 ENVIRON array contains environment: if shell variable V=thing,
888 ENVIRON["V"] is "thing"
890 multiple -f arguments permitted. error reporting is naive.
891 (they were permitted before, but only the last was used.)
893 fixed a really stupid botch in the debugging macro dprintf
895 fixed order of evaluation of commandline assignments to match
896 what the book claims: an argument of the form x=e is evaluated
897 at the time it would have been opened if it were a filename (p 63).
898 this invalidates the suggested answer to ex 4-1 (p 195).
900 removed some code that permitted -F (space) fieldseparator,
901 since it didn't quite work right anyway. (restored aug 2)
903 Apr 27, 1989:
904 Line number now accumulated correctly for comment lines.
906 Apr 26, 1989:
907 Debugging output now includes a version date,
908 if one compiles it into the source each time.
910 Apr 9, 1989:
911 Changed grammar to prohibit constants as 3rd arg of sub and gsub;
912 prevents class of overwriting-a-constant errors. (Last one?)
913 This invalidates the "banana" example on page 43 of the book.
915 Added \a ("alert"), \v (vertical tab), \xhhh (hexadecimal),
916 as in ANSI, for strings. Rescinded the sloppiness that permitted
917 non-octal digits in \ooo. Warning: not all compilers and libraries
918 will be able to deal with \x correctly.
920 Jan 9, 1989:
921 Fixed bug that caused tempcell list to contain a duplicate.
922 The fix is kludgy.
924 Dec 17, 1988:
925 Catches some more commandline errors in main.
926 Removed redundant decl of modf in run.c (confuses some compilers).
927 Warning: there's no single declaration of malloc, etc., in awk.h
928 that seems to satisfy all compilers.
930 Dec 7, 1988:
931 Added a bit of code to error printing to avoid printing nulls.
932 (Not clear that it actually would.)
934 Nov 27, 1988:
935 With fear and trembling, modified the grammar to permit
936 multiple pattern-action statements on one line without
937 an explicit separator. By definition, this capitulation
938 to the ghost of ancient implementations remains undefined
939 and thus subject to change without notice or apology.
940 DO NOT COUNT ON IT.
942 Oct 30, 1988:
943 Fixed bug in call() that failed to recover storage.
945 A warning is now generated if there are more arguments
946 in the call than in the definition (in lieu of fixing
947 another storage leak).
949 Oct 20, 1988:
950 Fixed %c: if expr is numeric, use numeric value;
951 otherwise print 1st char of string value. still
952 doesn't work if the value is 0 -- won't print \0.
954 Added a few more checks for running out of malloc.
956 Oct 12, 1988:
957 Fixed bug in call() that freed local arrays twice.
959 Fixed to handle deletion of non-existent array right;
960 complains about attempt to delete non-array element.
962 Sep 30, 1988:
963 Now guarantees to evaluate all arguments of built-in
964 functions, as in C; the appearance is that arguments
965 are evaluated before the function is called. Places
966 affected are sub (gsub was ok), substr, printf, and
967 all the built-in arithmetic functions in bltin().
968 A warning is generated if a bltin() is called with
969 the wrong number of arguments.
971 This requires changing makeprof on p167 of the book.
973 Aug 23, 1988:
974 setting FILENAME in BEGIN caused core dump, apparently
975 because it was freeing space not allocated by malloc.
977 July 24, 1988:
978 fixed egregious error in toupper/tolower functions.
979 still subject to rescinding, however.
981 July 2, 1988:
982 flush stdout before opening file or pipe
984 July 2, 1988:
985 performance bug in b.c/cgoto(): not freeing some sets of states.
986 partial fix only right now, and the number of states increased
987 to make it less obvious.
989 June 1, 1988:
990 check error status on close
992 May 28, 1988:
993 srand returns seed value it's using.
994 see 1/18/90
996 May 22, 1988:
997 Removed limit on depth of function calls.
999 May 10, 1988:
1000 Fixed lib.c to permit _ in commandline variable names.
1002 Mar 25, 1988:
1003 main.c fixed to recognize -- as terminator of command-
1004 line options. Illegal options flagged.
1005 Error reporting slightly cleaned up.
1007 Dec 2, 1987:
1008 Newer C compilers apply a strict scope rule to extern
1009 declarations within functions. Two extern declarations in
1010 lib.c and tran.c have been moved to obviate this problem.
1012 Oct xx, 1987:
1013 Reluctantly added toupper and tolower functions.
1014 Subject to rescinding without notice.
1016 Sep 17, 1987:
1017 Error-message printer had printf(s) instead of
1018 printf("%s",s); got core dumps when the message
1019 included a %.
1021 Sep 12, 1987:
1022 Very long printf strings caused core dump;
1023 fixed aprintf, asprintf, format to catch them.
1024 Can still get a core dump in printf itself.