1/**************************************************************** 2Copyright (C) Lucent Technologies 1997 3All Rights Reserved 4 5Permission to use, copy, modify, and distribute this software and 6its documentation for any purpose and without fee is hereby 7granted, provided that the above copyright notice appear in all 8copies and that both that the copyright notice and this 9permission notice and warranty disclaimer appear in supporting 10documentation, and that the name Lucent Technologies or any of 11its entities not be used in advertising or publicity pertaining 12to distribution of the software without specific, written prior 13permission. 14 15LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 16INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 17IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 18SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 19WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 20IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 21ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 22THIS SOFTWARE. 23****************************************************************/ 24 25This file lists all bug fixes, changes, etc., made since the AWK book 26was sent to the printers in August, 1987. 27 28May 23, 2010: 29 fixed long-standing overflow bug in run.c; many thanks to 30 nelson beebe for spotting it and providing the fix. 31 32 fixed bug that didn't parse -vd=1 properly; thanks to santiago 33 vila for spotting it. 34 35Feb 8, 2010: 36 i give up. replaced isblank with isspace in b.c; there are 37 no consistent header files. 38 39Nov 26, 2009: 40 fixed a long-standing issue with when FS takes effect. a 41 change to FS is now noticed immediately for subsequent splits. 42 43 changed the name getline() to awkgetline() to avoid yet another 44 name conflict somewhere. 45 46Feb 11, 2009: 47 temporarily for now defined HAS_ISBLANK, since that seems to 48 be the best way through the thicket. isblank arrived in C99, 49 but seems to be arriving at different systems at different 50 times. 51 52Oct 8, 2008: 53 fixed typo in b.c that set tmpvec wrongly. no one had ever 54 run into the problem, apparently. thanks to alistair crooks. 55 56Oct 23, 2007: 57 minor fix in lib.c: increase inputFS to 100, change malloc 58 for fields to n+1. 59 60 fixed memory fault caused by out of order test in setsval. 61 62 thanks to david o'brien, freebsd, for both fixes. 63 64May 1, 2007: 65 fiddle in makefile to fix for BSD make; thanks to igor sobrado. 66 67Mar 31, 2007: 68 fixed some null pointer refs calling adjbuf. 69 70Feb 21, 2007: 71 fixed a bug in matching the null RE in sub and gsub. thanks to al aho 72 who actually did the fix (in b.c), and to wolfgang seeberg for finding 73 it and providing a very compact test case. 74 75 fixed quotation in b.c; thanks to Hal Pratt and the Princeton Dante 76 Project. 77 78 removed some no-effect asserts in run.c. 79 80 fiddled maketab.c to not complain about bison-generated values. 81 82 removed the obsolete -V argument; fixed --version to print the 83 version and exit. 84 85 fixed wording and an outright error in the usage message; thanks to igor 86 sobrado and jason mcintyre. 87 88 fixed a bug in -d that caused core dump if no program followed. 89 90Jan 1, 2007: 91 dropped mac.code from makefile; there are few non-MacOSX 92 mac's these days. 93 94Jan 17, 2006: 95 system() not flagged as unsafe in the unadvertised -safe option. 96 found it while enhancing tests before shipping the ;login: article. 97 practice what you preach. 98 99 removed the 9-years-obsolete -mr and -mf flags. 100 101 added -version and --version options. 102 103 core dump on linux with BEGIN {nextfile}, now fixed. 104 105 removed some #ifdef's in run.c and lex.c that appear to no 106 longer be necessary. 107 108Apr 24, 2005: 109 modified lib.c so that values of $0 et al are preserved in the END 110 block, apparently as required by posix. thanks to havard eidnes 111 for the report and code. 112 113Jan 14, 2005: 114 fixed infinite loop in parsing, originally found by brian tsang. 115 thanks to arnold robbins for a suggestion that started me 116 rethinking it. 117 118Dec 31, 2004: 119 prevent overflow of -f array in main, head off potential error in 120 call of SYNTAX(), test malloc return in lib.c, all with thanks to 121 todd miller. 122 123Dec 22, 2004: 124 cranked up size of NCHARS; coverity thinks it can be overrun with 125 smaller size, and i think that's right. added some assertions to b.c 126 to catch places where it might overrun. the RE code is still fragile. 127 128Dec 5, 2004: 129 fixed a couple of overflow problems with ridiculous field numbers: 130 e.g., print $(2^32-1). thanks to ruslan ermilov, giorgos keramidas 131 and david o'brien at freebsd.org for patches. this really should 132 be re-done from scratch. 133 134Nov 21, 2004: 135 fixed another 25-year-old RE bug, in split. it's another failure 136 to (re-)initialize. thanks to steve fisher for spotting this and 137 providing a good test case. 138 139Nov 22, 2003: 140 fixed a bug in regular expressions that dates (so help me) from 1977; 141 it's been there from the beginning. an anchored longest match that 142 was longer than the number of states triggered a failure to initialize 143 the machine properly. many thanks to moinak ghosh for not only finding 144 this one but for providing a fix, in some of the most mysterious 145 code known to man. 146 147 fixed a storage leak in call() that appears to have been there since 148 1983 or so -- a function without an explicit return that assigns a 149 string to a parameter leaked a Cell. thanks to moinak ghosh for 150 spotting this very subtle one. 151 152Jul 31, 2003: 153 fixed, thanks to andrey chernov and ruslan ermilov, a bug in lex.c 154 that mis-handled the character 255 in input. (it was being compared 155 to EOF with a signed comparison.) 156 157Jul 29, 2003: 158 fixed (i think) the long-standing botch that included the beginning of 159 line state ^ for RE's in the set of valid characters; this led to a 160 variety of odd problems, including failure to properly match certain 161 regular expressions in non-US locales. thanks to ruslan for keeping 162 at this one. 163 164Jul 28, 2003: 165 n-th try at getting internationalization right, with thanks to volker 166 kiefel, arnold robbins and ruslan ermilov for advice, though they 167 should not be blamed for the outcome. according to posix, "." is the 168 radix character in programs and command line arguments regardless of 169 the locale; otherwise, the locale should prevail for input and output 170 of numbers. so it's intended to work that way. 171 172 i have rescinded the attempt to use strcoll in expanding shorthands in 173 regular expressions (cclenter). its properties are much too 174 surprising; for example [a-c] matches aAbBc in locale en_US but abBcC 175 in locale fr_CA. i can see how this might arise by implementation 176 but i cannot explain it to a human user. (this behavior can be seen 177 in gawk as well; we're leaning on the same library.) 178 179 the issue appears to be that strcoll is meant for sorting, where 180 merging upper and lower case may make sense (though note that unix 181 sort does not do this by default either). it is not appropriate 182 for regular expressions, where the goal is to match specific 183 patterns of characters. in any case, the notations [:lower:], etc., 184 are available in awk, and they are more likely to work correctly in 185 most locales. 186 187 a moratorium is hereby declared on internationalization changes. 188 i apologize to friends and colleagues in other parts of the world. 189 i would truly like to get this "right", but i don't know what 190 that is, and i do not want to keep making changes until it's clear. 191 192Jul 4, 2003: 193 fixed bug that permitted non-terminated RE, as in "awk /x". 194 195Jun 1, 2003: 196 subtle change to split: if source is empty, number of elems 197 is always 0 and the array is not set. 198 199Mar 21, 2003: 200 added some parens to isblank, in another attempt to make things 201 internationally portable. 202 203Mar 14, 2003: 204 the internationalization changes, somewhat modified, are now 205 reinstated. in theory awk will now do character comparisons 206 and case conversions in national language, but "." will always 207 be the decimal point separator on input and output regardless 208 of national language. isblank(){} has an #ifndef. 209 210 this no longer compiles on windows: LC_MESSAGES isn't defined 211 in vc6++. 212 213 fixed subtle behavior in field and record splitting: if FS is 214 a single character and RS is not empty, \n is NOT a separator. 215 this tortuous reading is found in the awk book; behavior now 216 matches gawk and mawk. 217 218Dec 13, 2002: 219 for the moment, the internationalization changes of nov 29 are 220 rolled back -- programs like x = 1.2 don't work in some locales, 221 because the parser is expecting x = 1,2. until i understand this 222 better, this will have to wait. 223 224Nov 29, 2002: 225 modified b.c (with tiny changes in main and run) to support 226 locales, using strcoll and iswhatever tests for posix character 227 classes. thanks to ruslan ermilov (ru@freebsd.org) for code. 228 the function isblank doesn't seem to have propagated to any 229 header file near me, so it's there explicitly. not properly 230 tested on non-ascii character sets by me. 231 232Jun 28, 2002: 233 modified run/format() and tran/getsval() to do a slightly better 234 job on using OFMT for output from print and CONVFMT for other 235 number->string conversions, as promised by posix and done by 236 gawk and mawk. there are still places where it doesn't work 237 right if CONVFMT is changed; by then the STR attribute of the 238 variable has been irrevocably set. thanks to arnold robbins for 239 code and examples. 240 241 fixed subtle bug in format that could get core dump. thanks to 242 Jaromir Dolecek <jdolecek@NetBSD.org> for finding and fixing. 243 minor cleanup in run.c / format() at the same time. 244 245 added some tests for null pointers to debugging printf's, which 246 were never intended for external consumption. thanks to dave 247 kerns (dkerns@lucent.com) for pointing this out. 248 249 GNU compatibility: an empty regexp matches anything (thanks to 250 dag-erling smorgrav, des@ofug.org). subject to reversion if 251 this does more harm than good. 252 253 pervasive small changes to make things more const-correct, as 254 reported by gcc's -Wwrite-strings. as it says in the gcc manual, 255 this may be more nuisance than useful. provoked by a suggestion 256 and code from arnaud desitter, arnaud@nimbus.geog.ox.ac.uk 257 258 minor documentation changes to note that this now compiles out 259 of the box on Mac OS X. 260 261Feb 10, 2002: 262 changed types in posix chars structure to quiet solaris cc. 263 264Jan 1, 2002: 265 fflush() or fflush("") flushes all files and pipes. 266 267 length(arrayname) returns number of elements; thanks to 268 arnold robbins for suggestion. 269 270 added a makefile.win to make it easier to build on windows. 271 based on dan allen's buildwin.bat. 272 273Nov 16, 2001: 274 added support for posix character class names like [:digit:], 275 which are not exactly shorter than [0-9] and perhaps no more 276 portable. thanks to dag-erling smorgrav for code. 277 278Feb 16, 2001: 279 removed -m option; no longer needed, and it was actually 280 broken (noted thanks to volker kiefel). 281 282Feb 10, 2001: 283 fixed an appalling bug in gettok: any sequence of digits, +,-, E, e, 284 and period was accepted as a valid number if it started with a period. 285 this would never have happened with the lex version. 286 287 other 1-character botches, now fixed, include a bare $ and a 288 bare " at the end of the input. 289 290Feb 7, 2001: 291 more (const char *) casts in b.c and tran.c to silence warnings. 292 293Nov 15, 2000: 294 fixed a bug introduced in august 1997 that caused expressions 295 like $f[1] to be syntax errors. thanks to arnold robbins for 296 noticing this and providing a fix. 297 298Oct 30, 2000: 299 fixed some nextfile bugs: not handling all cases. thanks to 300 arnold robbins for pointing this out. new regressions added. 301 302 close() is now a function. it returns whatever the library 303 fclose returns, and -1 for closing a file or pipe that wasn't 304 opened. 305 306Sep 24, 2000: 307 permit \n explicitly in character classes; won't work right 308 if comes in as "[\n]" but ok as /[\n]/, because of multiple 309 processing of \'s. thanks to arnold robbins. 310 311July 5, 2000: 312 minor fiddles in tran.c to keep compilers happy about uschar. 313 thanks to norman wilson. 314 315May 25, 2000: 316 yet another attempt at making 8-bit input work, with another 317 band-aid in b.c (member()), and some (uschar) casts to head 318 off potential errors in subscripts (like isdigit). also 319 changed HAT to NCHARS-2. thanks again to santiago vila. 320 321 changed maketab.c to ignore apparently out of range definitions 322 instead of halting; new freeBSD generates one. thanks to 323 jon snader <jsnader@ix.netcom.com> for pointing out the problem. 324 325May 2, 2000: 326 fixed an 8-bit problem in b.c by making several char*'s into 327 unsigned char*'s. not clear i have them all yet. thanks to 328 Santiago Vila <sanvila@unex.es> for the bug report. 329 330Apr 21, 2000: 331 finally found and fixed a memory leak in function call; it's 332 been there since functions were added ~1983. thanks to 333 jon bentley for the test case that found it. 334 335 added test in envinit to catch environment "variables" with 336 names beginning with '='; thanks to Berend Hasselman. 337 338Jul 28, 1999: 339 added test in defn() to catch function foo(foo), which 340 otherwise recurses until core dump. thanks to arnold 341 robbins for noticing this. 342 343Jun 20, 1999: 344 added *bp in gettok in lex.c; appears possible to exit function 345 without terminating the string. thanks to russ cox. 346 347Jun 2, 1999: 348 added function stdinit() to run to initialize files[] array, 349 in case stdin, etc., are not constants; some compilers care. 350 351May 10, 1999: 352 replaced the ERROR ... FATAL, etc., macros with functions 353 based on vprintf, to avoid problems caused by overrunning 354 fixed-size errbuf array. thanks to ralph corderoy for the 355 impetus, and for pointing out a string termination bug in 356 qstring as well. 357 358Apr 21, 1999: 359 fixed bug that caused occasional core dumps with commandline 360 variable with value ending in \. (thanks to nelson beebe for 361 the test case.) 362 363Apr 16, 1999: 364 with code kindly provided by Bruce Lilly, awk now parses 365 /=/ and similar constructs more sensibly in more places. 366 Bruce also provided some helpful test cases. 367 368Apr 5, 1999: 369 changed true/false to True/False in run.c to make it 370 easier to compile with C++. Added some casts on malloc 371 and realloc to be honest about casts; ditto. changed 372 ltype int to long in struct rrow to reduce some 64-bit 373 complaints; other changes scattered throughout for the 374 same purpose. thanks to Nelson Beebe for these portability 375 improvements. 376 377 removed some horrible pointer-int casting in b.c and elsewhere 378 by adding ptoi and itonp to localize the casts, which are 379 all benign. fixed one incipient bug that showed up on sgi 380 in 64-bit mode. 381 382 reset lineno for new source file; include filename in error 383 message. also fixed line number error in continuation lines. 384 (thanks to Nelson Beebe for both of these.) 385 386Mar 24, 1999: 387 Nelson Beebe notes that irix 5.3 yacc dies with a bogus 388 error; use a newer version or switch to bison, since sgi 389 is unlikely to fix it. 390 391Mar 5, 1999: 392 changed isnumber to is_number to avoid the problem caused by 393 versions of ctype.h that include the name isnumber. 394 395 distribution now includes a script for building on a Mac, 396 thanks to Dan Allen. 397 398Feb 20, 1999: 399 fixed memory leaks in run.c (call) and tran.c (setfval). 400 thanks to Stephen Nutt for finding these and providing the fixes. 401 402Jan 13, 1999: 403 replaced srand argument by (unsigned int) in run.c; 404 avoids problem on Mac and potentially on Unix & Windows. 405 thanks to Dan Allen. 406 407 added a few (int) casts to silence useless compiler warnings. 408 e.g., errorflag= in run.c jump(). 409 410 added proctab.c to the bundle outout; one less thing 411 to have to compile out of the box. 412 413 added calls to _popen and _pclose to the win95 stub for 414 pipes (thanks to Steve Adams for this helpful suggestion). 415 seems to work, though properties are not well understood 416 by me, and it appears that under some circumstances the 417 pipe output is truncated. Be careful. 418 419Oct 19, 1998: 420 fixed a couple of bugs in getrec: could fail to update $0 421 after a getline var; because inputFS wasn't initialized, 422 could split $0 on every character, a misleading diversion. 423 424 fixed caching bug in makedfa: LRU was actually removing 425 least often used. 426 427 thanks to ross ridge for finding these, and for providing 428 great bug reports. 429 430May 12, 1998: 431 fixed potential bug in readrec: might fail to update record 432 pointer after growing. thanks to dan levy for spotting this 433 and suggesting the fix. 434 435Mar 12, 1998: 436 added -V to print version number and die. 437 438Feb 11, 1998: 439 subtle silent bug in lex.c: if the program ended with a number 440 longer than 1 digit, part of the input would be pushed back and 441 parsed again because token buffer wasn't terminated right. 442 example: awk 'length($0) > 10'. blush. at least i found it 443 myself. 444 445Aug 31, 1997: 446 s/adelete/awkdelete/: SGI uses this in malloc.h. 447 thanks to nelson beebe for pointing this one out. 448 449Aug 21, 1997: 450 fixed some bugs in sub and gsub when replacement includes \\. 451 this is a dark, horrible corner, but at least now i believe that 452 the behavior is the same as gawk and the intended posix standard. 453 thanks to arnold robbins for advice here. 454 455Aug 9, 1997: 456 somewhat regretfully, replaced the ancient lex-based lexical 457 analyzer with one written in C. it's longer, generates less code, 458 and more portable; the old one depended too much on mysterious 459 properties of lex that were not preserved in other environments. 460 in theory these recognize the same language. 461 462 now using strtod to test whether a string is a number, instead of 463 the convoluted original function. should be more portable and 464 reliable if strtod is implemented right. 465 466 removed now-pointless optimization in makefile that tries to avoid 467 recompilation when awkgram.y is changed but symbols are not. 468 469 removed most fixed-size arrays, though a handful remain, some 470 of which are unchecked. you have been warned. 471 472Aug 4, 1997: 473 with some trepidation, replaced the ancient code that managed 474 fields and $0 in fixed-size arrays with arrays that grow on 475 demand. there is still some tension between trying to make this 476 run fast and making it clean; not sure it's right yet. 477 478 the ill-conceived -mr and -mf arguments are now useful only 479 for debugging. previous dynamic string code removed. 480 481 numerous other minor cleanups along the way. 482 483Jul 30, 1997: 484 using code provided by dan levy (to whom profuse thanks), replaced 485 fixed-size arrays and awkward kludges by a fairly uniform mechanism 486 to grow arrays as needed for printf, sub, gsub, etc. 487 488Jul 23, 1997: 489 falling off the end of a function returns "" and 0, not 0. 490 thanks to arnold robbins. 491 492Jun 17, 1997: 493 replaced several fixed-size arrays by dynamically-created ones 494 in run.c; added overflow tests to some previously unchecked cases. 495 getline, toupper, tolower. 496 497 getline code is still broken in that recursive calls may wind 498 up using the same space. [fixed later] 499 500 increased RECSIZE to 8192 to push problems further over the horizon. 501 502 added \r to \n as input line separator for programs, not data. 503 damn CRLFs. 504 505 modified format() to permit explicit printf("%c", 0) to include 506 a null byte in output. thanks to ken stailey for the fix. 507 508 added a "-safe" argument that disables file output (print >, 509 print >>), process creation (cmd|getline, print |, system), and 510 access to the environment (ENVIRON). this is a first approximation 511 to a "safe" version of awk, but don't rely on it too much. thanks 512 to joan feigenbaum and matt blaze for the inspiration long ago. 513 514Jul 8, 1996: 515 fixed long-standing bug in sub, gsub(/a/, "\\\\&"); thanks to 516 ralph corderoy. 517 518Jun 29, 1996: 519 fixed awful bug in new field splitting; didn't get all the places 520 where input was done. 521 522Jun 28, 1996: 523 changed field-splitting to conform to posix definition: fields are 524 split using the value of FS at the time of input; it used to be 525 the value when the field or NF was first referred to, a much less 526 predictable definition. thanks to arnold robbins for encouragement 527 to do the right thing. 528 529May 28, 1996: 530 fixed appalling but apparently unimportant bug in parsing octal 531 numbers in reg exprs. 532 533 explicit hex in reg exprs now limited to 2 chars: \xa, \xaa. 534 535May 27, 1996: 536 cleaned up some declarations so gcc -Wall is now almost silent. 537 538 makefile now includes backup copies of ytab.c and lexyy.c in case 539 one makes before looking; it also avoids recreating lexyy.c unless 540 really needed. 541 542 s/aprintf/awkprint, s/asprintf/awksprintf/ to avoid some name clashes 543 with unwisely-written header files. 544 545 thanks to jeffrey friedl for several of these. 546 547May 26, 1996: 548 an attempt to rationalize the (unsigned) char issue. almost all 549 instances of unsigned char have been removed; the handful of places 550 in b.c where chars are used as table indices have been hand-crafted. 551 added some latin-1 tests to the regression, but i'm not confident; 552 none of my compilers seem to care much. thanks to nelson beebe for 553 pointing out some others that do care. 554 555May 2, 1996: 556 removed all register declarations. 557 558 enhanced split(), as in gawk, etc: split(s, a, "") splits s into 559 a[1]...a[length(s)] with each character a single element. 560 561 made the same changes for field-splitting if FS is "". 562 563 added nextfile, as in gawk: causes immediate advance to next 564 input file. (thanks to arnold robbins for inspiration and code). 565 566 small fixes to regexpr code: can now handle []], [[], and 567 variants; [] is now a syntax error, rather than matching 568 everything; [z-a] is now empty, not z. far from complete 569 or correct, however. (thanks to jeffrey friedl for pointing out 570 some awful behaviors.) 571 572Apr 29, 1996: 573 replaced uchar by uschar everywhere; apparently some compilers 574 usurp this name and this causes conflicts. 575 576 fixed call to time in run.c (bltin); arg is time_t *. 577 578 replaced horrible pointer/long punning in b.c by a legitimate 579 union. should be safer on 64-bit machines and cleaner everywhere. 580 (thanks to nelson beebe for pointing out some of these problems.) 581 582 replaced nested comments by #if 0...#endif in run.c, lib.c. 583 584 removed getsval, setsval, execute macros from run.c and lib.c. 585 machines are 100x faster than they were when these macros were 586 first used. 587 588 revised filenames: awk.g.y => awkgram.y, awk.lx.l => awklex.l, 589 y.tab.[ch] => ytab.[ch], lex.yy.c => lexyy.c, all in the aid of 590 portability to nameless systems. 591 592 "make bundle" now includes yacc and lex output files for recipients 593 who don't have yacc or lex. 594 595Aug 15, 1995: 596 initialized Cells in setsymtab more carefully; some fields 597 were not set. (thanks to purify, all of whose complaints i 598 think i now understand.) 599 600 fixed at least one error in gsub that looked at -1-th element 601 of an array when substituting for a null match (e.g., $). 602 603 delete arrayname is now legal; it clears the elements but leaves 604 the array, which may not be the right behavior. 605 606 modified makefile: my current make can't cope with the test used 607 to avoid unnecessary yacc invocations. 608 609Jul 17, 1995: 610 added dynamically growing strings to awk.lx.l and b.c 611 to permit regular expressions to be much bigger. 612 the state arrays can still overflow. 613 614Aug 24, 1994: 615 detect duplicate arguments in function definitions (mdm). 616 617May 11, 1994: 618 trivial fix to printf to limit string size in sub(). 619 620Apr 22, 1994: 621 fixed yet another subtle self-assignment problem: 622 $1 = $2; $1 = $1 clobbered $1. 623 624 Regression tests now use private echo, to avoid quoting problems. 625 626Feb 2, 1994: 627 changed error() to print line number as %d, not %g. 628 629Jul 23, 1993: 630 cosmetic changes: increased sizes of some arrays, 631 reworded some error messages. 632 633 added CONVFMT as in posix (just replaced OFMT in getsval) 634 635 FILENAME is now "" until the first thing that causes a file 636 to be opened. 637 638Nov 28, 1992: 639 deleted yyunput and yyoutput from proto.h; 640 different versions of lex give these different declarations. 641 642May 31, 1992: 643 added -mr N and -mf N options: more record and fields. 644 these really ought to adjust automatically. 645 646 cleaned up some error messages; "out of space" now means 647 malloc returned NULL in all cases. 648 649 changed rehash so that if it runs out, it just returns; 650 things will continue to run slow, but maybe a bit longer. 651 652Apr 24, 1992: 653 remove redundant close of stdin when using -f -. 654 655 got rid of core dump with -d; awk -d just prints date. 656 657Apr 12, 1992: 658 added explicit check for /dev/std(in,out,err) in redirection. 659 unlike gawk, no /dev/fd/n yet. 660 661 added (file/pipe) builtin. hard to test satisfactorily. 662 not posix. 663 664Feb 20, 1992: 665 recompile after abortive changes; should be unchanged. 666 667Dec 2, 1991: 668 die-casting time: converted to ansi C, installed that. 669 670Nov 30, 1991: 671 fixed storage leak in freefa, failing to recover [N]CCL. 672 thanks to Bill Jones (jones@cs.usask.ca) 673 674Nov 19, 1991: 675 use RAND_MAX instead of literal in builtin(). 676 677Nov 12, 1991: 678 cranked up some fixed-size arrays in b.c, and added a test for 679 overflow in penter. thanks to mark larsen. 680 681Sep 24, 1991: 682 increased buffer in gsub. a very crude fix to a general problem. 683 and again on Sep 26. 684 685Aug 18, 1991: 686 enforce variable name syntax for commandline variables: has to 687 start with letter or _. 688 689Jul 27, 1991: 690 allow newline after ; in for statements. 691 692Jul 21, 1991: 693 fixed so that in self-assignment like $1=$1, side effects 694 like recomputing $0 take place. (this is getting subtle.) 695 696Jun 30, 1991: 697 better test for detecting too-long output record. 698 699Jun 2, 1991: 700 better defense against very long printf strings. 701 made break and continue illegal outside of loops. 702 703May 13, 1991: 704 removed extra arg on gettemp, tempfree. minor error message rewording. 705 706May 6, 1991: 707 fixed silly bug in hex parsing in hexstr(). 708 removed an apparently unnecessary test in isnumber(). 709 warn about weird printf conversions. 710 fixed unchecked array overwrite in relex(). 711 712 changed for (i in array) to access elements in sorted order. 713 then unchanged it -- it really does run slower in too many cases. 714 left the code in place, commented out. 715 716Feb 10, 1991: 717 check error status on all writes, to avoid banging on full disks. 718 719Jan 28, 1991: 720 awk -f - reads the program from stdin. 721 722Jan 11, 1991: 723 failed to set numeric state on $0 in cmd|getline context in run.c. 724 725Nov 2, 1990: 726 fixed sleazy test for integrality in getsval; use modf. 727 728Oct 29, 1990: 729 fixed sleazy buggy code in lib.c that looked (incorrectly) for 730 too long input lines. 731 732Oct 14, 1990: 733 fixed the bug on p. 198 in which it couldn't deduce that an 734 argument was an array in some contexts. replaced the error 735 message in intest() by code that damn well makes it an array. 736 737Oct 8, 1990: 738 fixed horrible bug: types and values were not preserved in 739 some kinds of self-assignment. (in assign().) 740 741Aug 24, 1990: 742 changed NCHARS to 256 to handle 8-bit characters in strings 743 presented to match(), etc. 744 745Jun 26, 1990: 746 changed struct rrow (awk.h) to use long instead of int for lval, 747 since cfoll() stores a pointer in it. now works better when int's 748 are smaller than pointers! 749 750May 6, 1990: 751 AVA fixed the grammar so that ! is uniformly of the same precedence as 752 unary + and -. This renders illegal some constructs like !x=y, which 753 now has to be parenthesized as !(x=y), and makes others work properly: 754 !x+y is (!x)+y, and x!y is x !y, not two pattern-action statements. 755 (These problems were pointed out by Bob Lenk of Posix.) 756 757 Added \x to regular expressions (already in strings). 758 Limited octal to octal digits; \8 and \9 are not octal. 759 Centralized the code for parsing escapes in regular expressions. 760 Added a bunch of tests to T.re and T.sub to verify some of this. 761 762Feb 9, 1990: 763 fixed null pointer dereference bug in main.c: -F[nothing]. sigh. 764 765 restored srand behavior: it returns the current seed. 766 767Jan 18, 1990: 768 srand now returns previous seed value (0 to start). 769 770Jan 5, 1990: 771 fix potential problem in tran.c -- something was freed, 772 then used in freesymtab. 773 774Oct 18, 1989: 775 another try to get the max number of open files set with 776 relatively machine-independent code. 777 778 small fix to input() in case of multiple reads after EOF. 779 780Oct 11, 1989: 781 FILENAME is now defined in the BEGIN block -- too many old 782 programs broke. 783 784 "-" means stdin in getline as well as on the commandline. 785 786 added a bunch of casts to the code to tell the truth about 787 char * vs. unsigned char *, a right royal pain. added a 788 setlocale call to the front of main, though probably no one 789 has it usefully implemented yet. 790 791Aug 24, 1989: 792 removed redundant relational tests against nullnode if parse 793 tree already had a relational at that point. 794 795Aug 11, 1989: 796 fixed bug: commandline variable assignment has to look like 797 var=something. (consider the man page for =, in file =.1) 798 799 changed number of arguments to functions to static arrays 800 to avoid repeated malloc calls. 801 802Aug 2, 1989: 803 restored -F (space) separator 804 805Jul 30, 1989: 806 added -v x=1 y=2 ... for immediate commandline variable assignment; 807 done before the BEGIN block for sure. they have to precede the 808 program if the program is on the commandline. 809 Modified Aug 2 to require a separate -v for each assignment. 810 811Jul 10, 1989: 812 fixed ref-thru-zero bug in environment code in tran.c 813 814Jun 23, 1989: 815 add newline to usage message. 816 817Jun 14, 1989: 818 added some missing ansi printf conversion letters: %i %X %E %G. 819 no sensible meaning for h or L, so they may not do what one expects. 820 821 made %* conversions work. 822 823 changed x^y so that if n is a positive integer, it's done 824 by explicit multiplication, thus achieving maximum accuracy. 825 (this should be done by pow() but it seems not to be locally.) 826 done to x ^= y as well. 827 828Jun 4, 1989: 829 ENVIRON array contains environment: if shell variable V=thing, 830 ENVIRON["V"] is "thing" 831 832 multiple -f arguments permitted. error reporting is naive. 833 (they were permitted before, but only the last was used.) 834 835 fixed a really stupid botch in the debugging macro dprintf 836 837 fixed order of evaluation of commandline assignments to match 838 what the book claims: an argument of the form x=e is evaluated 839 at the time it would have been opened if it were a filename (p 63). 840 this invalidates the suggested answer to ex 4-1 (p 195). 841 842 removed some code that permitted -F (space) fieldseparator, 843 since it didn't quite work right anyway. (restored aug 2) 844 845Apr 27, 1989: 846 Line number now accumulated correctly for comment lines. 847 848Apr 26, 1989: 849 Debugging output now includes a version date, 850 if one compiles it into the source each time. 851 852Apr 9, 1989: 853 Changed grammar to prohibit constants as 3rd arg of sub and gsub; 854 prevents class of overwriting-a-constant errors. (Last one?) 855 This invalidates the "banana" example on page 43 of the book. 856 857 Added \a ("alert"), \v (vertical tab), \xhhh (hexadecimal), 858 as in ANSI, for strings. Rescinded the sloppiness that permitted 859 non-octal digits in \ooo. Warning: not all compilers and libraries 860 will be able to deal with \x correctly. 861 862Jan 9, 1989: 863 Fixed bug that caused tempcell list to contain a duplicate. 864 The fix is kludgy. 865 866Dec 17, 1988: 867 Catches some more commandline errors in main. 868 Removed redundant decl of modf in run.c (confuses some compilers). 869 Warning: there's no single declaration of malloc, etc., in awk.h 870 that seems to satisfy all compilers. 871 872Dec 7, 1988: 873 Added a bit of code to error printing to avoid printing nulls. 874 (Not clear that it actually would.) 875 876Nov 27, 1988: 877 With fear and trembling, modified the grammar to permit 878 multiple pattern-action statements on one line without 879 an explicit separator. By definition, this capitulation 880 to the ghost of ancient implementations remains undefined 881 and thus subject to change without notice or apology. 882 DO NOT COUNT ON IT. 883 884Oct 30, 1988: 885 Fixed bug in call() that failed to recover storage. 886 887 A warning is now generated if there are more arguments 888 in the call than in the definition (in lieu of fixing 889 another storage leak). 890 891Oct 20, 1988: 892 Fixed %c: if expr is numeric, use numeric value; 893 otherwise print 1st char of string value. still 894 doesn't work if the value is 0 -- won't print \0. 895 896 Added a few more checks for running out of malloc. 897 898Oct 12, 1988: 899 Fixed bug in call() that freed local arrays twice. 900 901 Fixed to handle deletion of non-existent array right; 902 complains about attempt to delete non-array element. 903 904Sep 30, 1988: 905 Now guarantees to evaluate all arguments of built-in 906 functions, as in C; the appearance is that arguments 907 are evaluated before the function is called. Places 908 affected are sub (gsub was ok), substr, printf, and 909 all the built-in arithmetic functions in bltin(). 910 A warning is generated if a bltin() is called with 911 the wrong number of arguments. 912 913 This requires changing makeprof on p167 of the book. 914 915Aug 23, 1988: 916 setting FILENAME in BEGIN caused core dump, apparently 917 because it was freeing space not allocated by malloc. 918 919July 24, 1988: 920 fixed egregious error in toupper/tolower functions. 921 still subject to rescinding, however. 922 923July 2, 1988: 924 flush stdout before opening file or pipe 925 926July 2, 1988: 927 performance bug in b.c/cgoto(): not freeing some sets of states. 928 partial fix only right now, and the number of states increased 929 to make it less obvious. 930 931June 1, 1988: 932 check error status on close 933 934May 28, 1988: 935 srand returns seed value it's using. 936 see 1/18/90 937 938May 22, 1988: 939 Removed limit on depth of function calls. 940 941May 10, 1988: 942 Fixed lib.c to permit _ in commandline variable names. 943 944Mar 25, 1988: 945 main.c fixed to recognize -- as terminator of command- 946 line options. Illegal options flagged. 947 Error reporting slightly cleaned up. 948 949Dec 2, 1987: 950 Newer C compilers apply a strict scope rule to extern 951 declarations within functions. Two extern declarations in 952 lib.c and tran.c have been moved to obviate this problem. 953 954Oct xx, 1987: 955 Reluctantly added toupper and tolower functions. 956 Subject to rescinding without notice. 957 958Sep 17, 1987: 959 Error-message printer had printf(s) instead of 960 printf("%s",s); got core dumps when the message 961 included a %. 962 963Sep 12, 1987: 964 Very long printf strings caused core dump; 965 fixed aprintf, asprintf, format to catch them. 966 Can still get a core dump in printf itself. 967 968 969