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