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[SCM] gawk branch, gawk-5.1-stable, updated. gawk-4.1.0-4293-ga08cc63
|
From: |
Arnold Robbins |
|
Subject: |
[SCM] gawk branch, gawk-5.1-stable, updated. gawk-4.1.0-4293-ga08cc63 |
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Date: |
Thu, 9 Sep 2021 14:37:20 -0400 (EDT) |
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The branch, gawk-5.1-stable has been updated
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from 17652fe29a5decb9e722d9c544249333a7bd5aea (commit)
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- Log -----------------------------------------------------------------
http://git.sv.gnu.org/cgit/gawk.git/commit/?id=a08cc63bc8d11343012b283c91cb383bc3fff90d
commit a08cc63bc8d11343012b283c91cb383bc3fff90d
Author: Arnold D. Robbins <arnold@skeeve.com>
Date: Thu Sep 9 21:37:01 2021 +0300
Documentation improvement on interval expressions.
diff --git a/doc/ChangeLog b/doc/ChangeLog
index f77fc00..6505bc0 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2021-09-09 Arnold D. Robbins <arnold@skeeve.com>
+
+ * gawktexi.in (Interval Expressions): Add some notes borrowed from
+ Paul Eggert in the grep documentation.
+
2021-08-26 Arnold D. Robbins <arnold@skeeve.com>
* gawktexi.in (Strong Regexp Constants): Document behavior
diff --git a/doc/gawk.info b/doc/gawk.info
index b7a050d..94ebf26 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -3977,17 +3977,33 @@ practice to always escape them with a backslash. Then
the regexp
constants are valid and work the way you want them to, using any version
of 'awk'.(1)
- Finally, when '{' and '}' appear in regexp constants in a way that
-cannot be interpreted as an interval expression (such as '/q{a}/'), then
-they stand for themselves.
+ When '{' and '}' appear in regexp constants in a way that cannot be
+interpreted as an interval expression (such as '/q{a}/'), then they
+stand for themselves.
As mentioned, interval expressions were not traditionally available
in 'awk'. In March of 2019, BWK 'awk' (finally) acquired them.
-
- Nonetheless, because they were not available for so many decades,
-'gawk' continues to not supply them when in compatibility mode (*note
+Nonetheless, because they were not available for so many decades, 'gawk'
+continues to not supply them when in compatibility mode (*note
Options::).
+ POSIX says that interval expressions containing repetition counts
+greater than 255 produce unspecified results.
+
+ In the manual for GNU 'grep', Paul Eggert notes the following:
+
+ Interval expressions may be implemented internally via repetition.
+ For example, '^(a|bc){2,4}$' might be implemented as
+ '^(a|bc)(a|bc)((a|bc)(a|bc)?)?$'. A large repetition count may
+ exhaust memory or greatly slow matching. Even small counts can
+ cause problems if cascaded; for example, 'grep -E
+ ".*{10,}{10,}{10,}{10,}{10,}"' is likely to overflow a stack.
+ Fortunately, regular expressions like these are typically
+ artificial, and cascaded repetitions do not conform to POSIX so
+ cannot be used in portable programs anyway.
+
+This same caveat applies to 'gawk'.
+
---------- Footnotes ----------
(1) Use two backslashes if you're using a string constant with a
@@ -36221,6 +36237,8 @@ Index
* EBCDIC <2>: History summary. (line 20)
* effective group ID of gawk user: Auto-set. (line 172)
* effective user ID of gawk user: Auto-set. (line 180)
+* Eggert, Paul: Interval Expressions.
+ (line 36)
* egrep utility: Bracket Expressions. (line 34)
* egrep utility <1>: Egrep Program. (line 6)
* egrep.awk program: Egrep Program. (line 76)
@@ -38447,543 +38465,543 @@ Node: Regexp Operators173918
Node: Regexp Operator Details174403
Ref: Regexp Operator Details-Footnote-1181767
Node: Interval Expressions181914
-Ref: Interval Expressions-Footnote-1183335
-Node: Bracket Expressions183433
-Ref: table-char-classes185909
-Node: Leftmost Longest189235
-Node: Computed Regexps190538
-Node: GNU Regexp Operators193965
-Node: Case-sensitivity197702
-Ref: Case-sensitivity-Footnote-1200568
-Ref: Case-sensitivity-Footnote-2200803
-Node: Regexp Summary200911
-Node: Reading Files202377
-Node: Records204646
-Node: awk split records205721
-Node: gawk split records210421
-Ref: gawk split records-Footnote-1215495
-Node: Fields215532
-Node: Nonconstant Fields218273
-Ref: Nonconstant Fields-Footnote-1220509
-Node: Changing Fields220713
-Node: Field Separators226744
-Node: Default Field Splitting229442
-Node: Regexp Field Splitting230560
-Node: Single Character Fields234237
-Node: Command Line Field Separator235297
-Node: Full Line Fields238515
-Ref: Full Line Fields-Footnote-1240037
-Ref: Full Line Fields-Footnote-2240083
-Node: Field Splitting Summary240184
-Node: Constant Size242258
-Node: Fixed width data242990
-Node: Skipping intervening246457
-Node: Allowing trailing data247255
-Node: Fields with fixed data248292
-Node: Splitting By Content249810
-Ref: Splitting By Content-Footnote-1253593
-Node: More CSV253756
-Node: Testing field creation255348
-Node: Multiple Line256973
-Node: Getline263250
-Node: Plain Getline265719
-Node: Getline/Variable268292
-Node: Getline/File269443
-Node: Getline/Variable/File270831
-Ref: Getline/Variable/File-Footnote-1272436
-Node: Getline/Pipe272524
-Node: Getline/Variable/Pipe275228
-Node: Getline/Coprocess276363
-Node: Getline/Variable/Coprocess277630
-Node: Getline Notes278372
-Node: Getline Summary281169
-Ref: table-getline-variants281593
-Node: Read Timeout282341
-Ref: Read Timeout-Footnote-1286247
-Node: Retrying Input286305
-Node: Command-line directories287504
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+Node: Fields with fixed data249071
+Node: Splitting By Content250589
+Ref: Splitting By Content-Footnote-1254372
+Node: More CSV254535
+Node: Testing field creation256127
+Node: Multiple Line257752
+Node: Getline264029
+Node: Plain Getline266498
+Node: Getline/Variable269071
+Node: Getline/File270222
+Node: Getline/Variable/File271610
+Ref: Getline/Variable/File-Footnote-1273215
+Node: Getline/Pipe273303
+Node: Getline/Variable/Pipe276007
+Node: Getline/Coprocess277142
+Node: Getline/Variable/Coprocess278409
+Node: Getline Notes279151
+Node: Getline Summary281948
+Ref: table-getline-variants282372
+Node: Read Timeout283120
+Ref: Read Timeout-Footnote-1287026
+Node: Retrying Input287084
+Node: Command-line directories288283
+Node: Input Summary289189
+Node: Input Exercises292361
+Node: Printing292795
+Node: Print294629
+Node: Print Examples296086
+Node: Output Separators298866
+Node: OFMT300883
+Node: Printf302239
+Node: Basic Printf303024
+Node: Control Letters304598
+Node: Format Modifiers309762
+Node: Printf Examples315777
+Node: Redirection318263
+Node: Special FD325104
+Ref: Special FD-Footnote-1328272
+Node: Special Files328346
+Node: Other Inherited Files328963
+Node: Special Network329964
+Node: Special Caveats330824
+Node: Close Files And Pipes331773
+Ref: table-close-pipe-return-values338680
+Ref: Close Files And Pipes-Footnote-1339493
+Ref: Close Files And Pipes-Footnote-2339641
+Node: Nonfatal339793
+Node: Output Summary342131
+Node: Output Exercises343353
+Node: Expressions344032
+Node: Values345220
+Node: Constants345898
+Node: Scalar Constants346589
+Ref: Scalar Constants-Footnote-1349099
+Node: Nondecimal-numbers349349
+Node: Regexp Constants352350
+Node: Using Constant Regexps352876
+Node: Standard Regexp Constants353498
+Node: Strong Regexp Constants356686
+Node: Variables360110
+Node: Using Variables360767
+Node: Assignment Options362677
+Node: Conversion365148
+Node: Strings And Numbers365672
+Ref: Strings And Numbers-Footnote-1368735
+Node: Locale influences conversions368844
+Ref: table-locale-affects371602
+Node: All Operators372220
+Node: Arithmetic Ops372849
+Node: Concatenation375565
+Ref: Concatenation-Footnote-1378412
+Node: Assignment Ops378519
+Ref: table-assign-ops383510
+Node: Increment Ops384823
+Node: Truth Values and Conditions388283
+Node: Truth Values389357
+Node: Typing and Comparison390405
+Node: Variable Typing391225
+Ref: Variable Typing-Footnote-1397688
+Ref: Variable Typing-Footnote-2397760
+Node: Comparison Operators397837
+Ref: table-relational-ops398256
+Node: POSIX String Comparison401751
+Ref: POSIX String Comparison-Footnote-1403446
+Ref: POSIX String Comparison-Footnote-2403585
+Node: Boolean Ops403669
+Ref: Boolean Ops-Footnote-1408151
+Node: Conditional Exp408243
+Node: Function Calls409979
+Node: Precedence413856
+Node: Locales417515
+Node: Expressions Summary419147
+Node: Patterns and Actions421720
+Node: Pattern Overview422840
+Node: Regexp Patterns424517
+Node: Expression Patterns425059
+Node: Ranges428840
+Node: BEGIN/END431948
+Node: Using BEGIN/END432709
+Ref: Using BEGIN/END-Footnote-1435463
+Node: I/O And BEGIN/END435569
+Node: BEGINFILE/ENDFILE437882
+Node: Empty441113
+Node: Using Shell Variables441430
+Node: Action Overview443704
+Node: Statements446029
+Node: If Statement447877
+Node: While Statement449372
+Node: Do Statement451400
+Node: For Statement452548
+Node: Switch Statement455719
+Node: Break Statement458160
+Node: Continue Statement460252
+Node: Next Statement462079
+Node: Nextfile Statement464462
+Node: Exit Statement467151
+Node: Built-in Variables469554
+Node: User-modified470687
+Node: Auto-set478454
+Ref: Auto-set-Footnote-1495261
+Ref: Auto-set-Footnote-2495467
+Node: ARGC and ARGV495523
+Node: Pattern Action Summary499736
+Node: Arrays502166
+Node: Array Basics503495
+Node: Array Intro504339
+Ref: figure-array-elements506314
+Ref: Array Intro-Footnote-1509018
+Node: Reference to Elements509146
+Node: Assigning Elements511610
+Node: Array Example512101
+Node: Scanning an Array513860
+Node: Controlling Scanning516882
+Ref: Controlling Scanning-Footnote-1523338
+Node: Numeric Array Subscripts523654
+Node: Uninitialized Subscripts525838
+Node: Delete527457
+Ref: Delete-Footnote-1530209
+Node: Multidimensional530266
+Node: Multiscanning533361
+Node: Arrays of Arrays534952
+Node: Arrays Summary539720
+Node: Functions541813
+Node: Built-in542851
+Node: Calling Built-in543932
+Node: Numeric Functions545928
+Ref: Numeric Functions-Footnote-1549956
+Ref: Numeric Functions-Footnote-2550604
+Ref: Numeric Functions-Footnote-3550652
+Node: String Functions550924
+Ref: String Functions-Footnote-1575439
+Ref: String Functions-Footnote-2575567
+Ref: String Functions-Footnote-3575815
+Node: Gory Details575902
+Ref: table-sub-escapes577693
+Ref: table-sub-proposed579212
+Ref: table-posix-sub580575
+Ref: table-gensub-escapes582116
+Ref: Gory Details-Footnote-1582939
+Node: I/O Functions583093
+Ref: table-system-return-values589547
+Ref: I/O Functions-Footnote-1591627
+Ref: I/O Functions-Footnote-2591775
+Node: Time Functions591895
+Ref: Time Functions-Footnote-1602566
+Ref: Time Functions-Footnote-2602634
+Ref: Time Functions-Footnote-3602792
+Ref: Time Functions-Footnote-4602903
+Ref: Time Functions-Footnote-5603015
+Ref: Time Functions-Footnote-6603242
+Node: Bitwise Functions603508
+Ref: table-bitwise-ops604102
+Ref: Bitwise Functions-Footnote-1610165
+Ref: Bitwise Functions-Footnote-2610338
+Node: Type Functions610529
+Node: I18N Functions613392
+Node: User-defined615043
+Node: Definition Syntax615855
+Ref: Definition Syntax-Footnote-1621549
+Node: Function Example621620
+Ref: Function Example-Footnote-1624542
+Node: Function Calling624564
+Node: Calling A Function625152
+Node: Variable Scope626110
+Node: Pass By Value/Reference629104
+Node: Function Caveats631748
+Ref: Function Caveats-Footnote-1633795
+Node: Return Statement633915
+Node: Dynamic Typing636894
+Node: Indirect Calls637824
+Ref: Indirect Calls-Footnote-1648076
+Node: Functions Summary648204
+Node: Library Functions650909
+Ref: Library Functions-Footnote-1654516
+Ref: Library Functions-Footnote-2654659
+Node: Library Names654830
+Ref: Library Names-Footnote-1658497
+Ref: Library Names-Footnote-2658720
+Node: General Functions658806
+Node: Strtonum Function659988
+Node: Assert Function663010
+Node: Round Function666336
+Node: Cliff Random Function667876
+Node: Ordinal Functions668892
+Ref: Ordinal Functions-Footnote-1671955
+Ref: Ordinal Functions-Footnote-2672207
+Node: Join Function672417
+Ref: Join Function-Footnote-1674187
+Node: Getlocaltime Function674387
+Node: Readfile Function678129
+Node: Shell Quoting680106
+Node: Isnumeric Function681534
+Node: Data File Management682922
+Node: Filetrans Function683554
+Node: Rewind Function687650
+Node: File Checking689559
+Ref: File Checking-Footnote-1690893
+Node: Empty Files691094
+Node: Ignoring Assigns693073
+Node: Getopt Function694623
+Ref: Getopt Function-Footnote-1709846
+Node: Passwd Functions710046
+Ref: Passwd Functions-Footnote-1718885
+Node: Group Functions718973
+Ref: Group Functions-Footnote-1726871
+Node: Walking Arrays727078
+Node: Library Functions Summary730086
+Node: Library Exercises731492
+Node: Sample Programs731957
+Node: Running Examples732727
+Node: Clones733455
+Node: Cut Program734679
+Node: Egrep Program744819
+Node: Id Program753820
+Node: Split Program763767
+Ref: Split Program-Footnote-1773660
+Node: Tee Program773833
+Node: Uniq Program776623
+Node: Wc Program784211
+Node: Bytes vs. Characters784598
+Node: Using extensions786146
+Node: wc program786900
+Node: Miscellaneous Programs791765
+Node: Dupword Program792978
+Node: Alarm Program795008
+Node: Translate Program799863
+Ref: Translate Program-Footnote-1804428
+Node: Labels Program804698
+Ref: Labels Program-Footnote-1808049
+Node: Word Sorting808133
+Node: History Sorting812205
+Node: Extract Program814430
+Node: Simple Sed822484
+Node: Igawk Program825558
+Ref: Igawk Program-Footnote-1839889
+Ref: Igawk Program-Footnote-2840091
+Ref: Igawk Program-Footnote-3840213
+Node: Anagram Program840328
+Node: Signature Program843390
+Node: Programs Summary844637
+Node: Programs Exercises845851
+Ref: Programs Exercises-Footnote-1849981
+Node: Advanced Features850067
+Node: Nondecimal Data852134
+Node: Array Sorting853725
+Node: Controlling Array Traversal854425
+Ref: Controlling Array Traversal-Footnote-1862793
+Node: Array Sorting Functions862911
+Ref: Array Sorting Functions-Footnote-1868285
+Node: Two-way I/O868481
+Ref: Two-way I/O-Footnote-1876207
+Ref: Two-way I/O-Footnote-2876394
+Node: TCP/IP Networking876476
+Node: Profiling879594
+Node: Extension Philosophy888903
+Node: Advanced Features Summary890382
+Node: Internationalization892397
+Node: I18N and L10N894071
+Node: Explaining gettext894758
+Ref: Explaining gettext-Footnote-1900650
+Ref: Explaining gettext-Footnote-2900835
+Node: Programmer i18n901000
+Ref: Programmer i18n-Footnote-1905949
+Node: Translator i18n905998
+Node: String Extraction906792
+Ref: String Extraction-Footnote-1907924
+Node: Printf Ordering908010
+Ref: Printf Ordering-Footnote-1910796
+Node: I18N Portability910860
+Ref: I18N Portability-Footnote-1913316
+Node: I18N Example913379
+Ref: I18N Example-Footnote-1916654
+Ref: I18N Example-Footnote-2916727
+Node: Gawk I18N916836
+Node: I18N Summary917485
+Node: Debugger918826
+Node: Debugging919826
+Node: Debugging Concepts920267
+Node: Debugging Terms922076
+Node: Awk Debugging924651
+Ref: Awk Debugging-Footnote-1925596
+Node: Sample Debugging Session925728
+Node: Debugger Invocation926262
+Node: Finding The Bug927648
+Node: List of Debugger Commands934122
+Node: Breakpoint Control935455
+Node: Debugger Execution Control939149
+Node: Viewing And Changing Data942511
+Node: Execution Stack946052
+Node: Debugger Info947689
+Node: Miscellaneous Debugger Commands951760
+Node: Readline Support956822
+Node: Limitations957718
+Node: Debugging Summary960272
+Node: Namespaces961551
+Node: Global Namespace962662
+Node: Qualified Names964060
+Node: Default Namespace965059
+Node: Changing The Namespace965800
+Node: Naming Rules967414
+Node: Internal Name Management969262
+Node: Namespace Example970304
+Node: Namespace And Features972866
+Node: Namespace Summary974301
+Node: Arbitrary Precision Arithmetic975778
+Node: Computer Arithmetic977265
+Ref: table-numeric-ranges981031
+Ref: table-floating-point-ranges981524
+Ref: Computer Arithmetic-Footnote-1982182
+Node: Math Definitions982239
+Ref: table-ieee-formats985555
+Ref: Math Definitions-Footnote-1986158
+Node: MPFR features986263
+Node: FP Math Caution987981
+Ref: FP Math Caution-Footnote-1989053
+Node: Inexactness of computations989422
+Node: Inexact representation990382
+Node: Comparing FP Values991742
+Node: Errors accumulate992983
+Node: Getting Accuracy994416
+Node: Try To Round997126
+Node: Setting precision998025
+Ref: table-predefined-precision-strings998722
+Node: Setting the rounding mode1000552
+Ref: table-gawk-rounding-modes1000926
+Ref: Setting the rounding mode-Footnote-11004857
+Node: Arbitrary Precision Integers1005036
+Ref: Arbitrary Precision Integers-Footnote-11008211
+Node: Checking for MPFR1008360
+Node: POSIX Floating Point Problems1009834
+Ref: POSIX Floating Point Problems-Footnote-11014119
+Node: Floating point summary1014157
+Node: Dynamic Extensions1016347
+Node: Extension Intro1017900
+Node: Plugin License1019166
+Node: Extension Mechanism Outline1019963
+Ref: figure-load-extension1020402
+Ref: figure-register-new-function1021967
+Ref: figure-call-new-function1023059
+Node: Extension API Description1025121
+Node: Extension API Functions Introduction1026834
+Ref: table-api-std-headers1028670
+Node: General Data Types1032919
+Ref: General Data Types-Footnote-11041549
+Node: Memory Allocation Functions1041848
+Ref: Memory Allocation Functions-Footnote-11046349
+Node: Constructor Functions1046448
+Node: API Ownership of MPFR and GMP Values1049914
+Node: Registration Functions1051227
+Node: Extension Functions1051927
+Node: Exit Callback Functions1057249
+Node: Extension Version String1058499
+Node: Input Parsers1059162
+Node: Output Wrappers1071883
+Node: Two-way processors1076395
+Node: Printing Messages1078660
+Ref: Printing Messages-Footnote-11079831
+Node: Updating ERRNO1079984
+Node: Requesting Values1080723
+Ref: table-value-types-returned1081460
+Node: Accessing Parameters1082396
+Node: Symbol Table Access1083633
+Node: Symbol table by name1084145
+Ref: Symbol table by name-Footnote-11087169
+Node: Symbol table by cookie1087297
+Ref: Symbol table by cookie-Footnote-11091482
+Node: Cached values1091546
+Ref: Cached values-Footnote-11095082
+Node: Array Manipulation1095235
+Ref: Array Manipulation-Footnote-11096326
+Node: Array Data Types1096363
+Ref: Array Data Types-Footnote-11099021
+Node: Array Functions1099113
+Node: Flattening Arrays1103611
+Node: Creating Arrays1110587
+Node: Redirection API1115354
+Node: Extension API Variables1118187
+Node: Extension Versioning1118898
+Ref: gawk-api-version1119327
+Node: Extension GMP/MPFR Versioning1121058
+Node: Extension API Informational Variables1122686
+Node: Extension API Boilerplate1123759
+Node: Changes from API V11127733
+Node: Finding Extensions1129305
+Node: Extension Example1129864
+Node: Internal File Description1130662
+Node: Internal File Ops1134742
+Ref: Internal File Ops-Footnote-11146092
+Node: Using Internal File Ops1146232
+Ref: Using Internal File Ops-Footnote-11148615
+Node: Extension Samples1148889
+Node: Extension Sample File Functions1150418
+Node: Extension Sample Fnmatch1158067
+Node: Extension Sample Fork1159554
+Node: Extension Sample Inplace1160772
+Node: Extension Sample Ord1164398
+Node: Extension Sample Readdir1165234
+Ref: table-readdir-file-types1166123
+Node: Extension Sample Revout1167190
+Node: Extension Sample Rev2way1167779
+Node: Extension Sample Read write array1168519
+Node: Extension Sample Readfile1170461
+Node: Extension Sample Time1171556
+Node: Extension Sample API Tests1173308
+Node: gawkextlib1173800
+Node: Extension summary1176718
+Node: Extension Exercises1180420
+Node: Language History1181662
+Node: V7/SVR3.11183318
+Node: SVR41185470
+Node: POSIX1186904
+Node: BTL1188285
+Node: POSIX/GNU1189014
+Node: Feature History1194792
+Node: Common Extensions1211967
+Node: Ranges and Locales1213250
+Ref: Ranges and Locales-Footnote-11217866
+Ref: Ranges and Locales-Footnote-21217893
+Ref: Ranges and Locales-Footnote-31218128
+Node: Contributors1218351
+Node: History summary1224348
+Node: Installation1225728
+Node: Gawk Distribution1226672
+Node: Getting1227156
+Node: Extracting1228119
+Node: Distribution contents1229757
+Node: Unix Installation1236237
+Node: Quick Installation1236919
+Node: Compiling with MPFR1239400
+Node: Shell Startup Files1240092
+Node: Additional Configuration Options1241181
+Node: Configuration Philosophy1243496
+Node: Non-Unix Installation1245865
+Node: PC Installation1246325
+Node: PC Binary Installation1247163
+Node: PC Compiling1247598
+Node: PC Using1248715
+Node: Cygwin1252268
+Node: MSYS1253492
+Node: VMS Installation1254094
+Node: VMS Compilation1254813
+Ref: VMS Compilation-Footnote-11256042
+Node: VMS Dynamic Extensions1256100
+Node: VMS Installation Details1257785
+Node: VMS Running1260047
+Node: VMS GNV1264326
+Node: Bugs1265040
+Node: Bug definition1265920
+Node: Bug address1268424
+Node: Usenet1271812
+Node: Performance bugs1272821
+Node: Asking for help1275742
+Node: Maintainers1277704
+Node: Other Versions1278898
+Node: Installation summary1286750
+Node: Notes1288114
+Node: Compatibility Mode1288908
+Node: Additions1289690
+Node: Accessing The Source1290615
+Node: Adding Code1292052
+Node: New Ports1298271
+Node: Derived Files1302646
+Ref: Derived Files-Footnote-11308306
+Ref: Derived Files-Footnote-21308341
+Ref: Derived Files-Footnote-31308939
+Node: Future Extensions1309053
+Node: Implementation Limitations1309711
+Node: Extension Design1310921
+Node: Old Extension Problems1312065
+Ref: Old Extension Problems-Footnote-11313583
+Node: Extension New Mechanism Goals1313640
+Ref: Extension New Mechanism Goals-Footnote-11317004
+Node: Extension Other Design Decisions1317193
+Node: Extension Future Growth1319306
+Node: Notes summary1319912
+Node: Basic Concepts1321070
+Node: Basic High Level1321751
+Ref: figure-general-flow1322033
+Ref: figure-process-flow1322718
+Ref: Basic High Level-Footnote-11326019
+Node: Basic Data Typing1326204
+Node: Glossary1329532
+Node: Copying1361417
+Node: GNU Free Documentation License1398960
+Node: Index1424080
End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index 7d5aa4d..8470790 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -6093,17 +6093,37 @@ regexp constants are valid and work the way you want
them to, using
any version of @command{awk}.@footnote{Use two backslashes if you're
using a string constant with a regexp operator or function.}
-Finally, when @samp{@{} and @samp{@}} appear in regexp constants
+When @samp{@{} and @samp{@}} appear in regexp constants
in a way that cannot be interpreted as an interval expression
(such as @code{/q@{a@}/}), then they stand for themselves.
As mentioned, interval expressions were not traditionally available
in @command{awk}. In March of 2019, BWK @command{awk} (finally) acquired them.
-
Nonetheless, because they were not available for
so many decades, @command{gawk} continues to not supply them
when in compatibility mode (@pxref{Options}).
+POSIX says that interval expressions containing repetition counts greater
+than 255 produce unspecified results.
+
+@cindex Eggert, Paul
+In the manual for GNU @command{grep}, Paul Eggert notes the following:
+
+@quotation
+Interval expressions may be implemented internally via repetition.
+For example, @samp{^(a|bc)@{2,4@}$} might be implemented as
+@samp{^(a|bc)(a|bc)((a|bc)(a|bc)?)?$}. A large repetition count may
+exhaust memory or greatly slow matching. Even small counts can cause
+problems if cascaded; for example, @samp{grep -E
+".*@{10,@}@{10,@}@{10,@}@{10,@}@{10,@}"} is likely to overflow a
+stack. Fortunately, regular expressions like these are typically
+artificial, and cascaded repetitions do not conform to POSIX so cannot
+be used in portable programs anyway.
+@end quotation
+
+@noindent
+This same caveat applies to @command{gawk}.
+
@node Bracket Expressions
@section Using Bracket Expressions
@cindex bracket expressions
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 6ace2e8..9513cf1 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -5821,17 +5821,37 @@ regexp constants are valid and work the way you want
them to, using
any version of @command{awk}.@footnote{Use two backslashes if you're
using a string constant with a regexp operator or function.}
-Finally, when @samp{@{} and @samp{@}} appear in regexp constants
+When @samp{@{} and @samp{@}} appear in regexp constants
in a way that cannot be interpreted as an interval expression
(such as @code{/q@{a@}/}), then they stand for themselves.
As mentioned, interval expressions were not traditionally available
in @command{awk}. In March of 2019, BWK @command{awk} (finally) acquired them.
-
Nonetheless, because they were not available for
so many decades, @command{gawk} continues to not supply them
when in compatibility mode (@pxref{Options}).
+POSIX says that interval expressions containing repetition counts greater
+than 255 produce unspecified results.
+
+@cindex Eggert, Paul
+In the manual for GNU @command{grep}, Paul Eggert notes the following:
+
+@quotation
+Interval expressions may be implemented internally via repetition.
+For example, @samp{^(a|bc)@{2,4@}$} might be implemented as
+@samp{^(a|bc)(a|bc)((a|bc)(a|bc)?)?$}. A large repetition count may
+exhaust memory or greatly slow matching. Even small counts can cause
+problems if cascaded; for example, @samp{grep -E
+".*@{10,@}@{10,@}@{10,@}@{10,@}@{10,@}"} is likely to overflow a
+stack. Fortunately, regular expressions like these are typically
+artificial, and cascaded repetitions do not conform to POSIX so cannot
+be used in portable programs anyway.
+@end quotation
+
+@noindent
+This same caveat applies to @command{gawk}.
+
@node Bracket Expressions
@section Using Bracket Expressions
@cindex bracket expressions
http://git.sv.gnu.org/cgit/gawk.git/commit/?id=29797edf10e09f27a81a77dd8db53f50b277a24a
commit 29797edf10e09f27a81a77dd8db53f50b277a24a
Author: Arnold D. Robbins <arnold@skeeve.com>
Date: Thu Sep 9 21:34:44 2021 +0300
Fix a typo in pc/Makefile.tst.
diff --git a/pc/Makefile.tst b/pc/Makefile.tst
index b2c92c7..a11dc1b 100644
--- a/pc/Makefile.tst
+++ b/pc/Makefile.tst
@@ -311,7 +311,7 @@ NEED_LOCALE_EN = \
widesub widesub2 widesub3 widesub4
-# Unused at the moment, since nlstringtest has additional stufff it does
+# Unused at the moment, since nlstringtest has additional stuff it does
# NEED_LOCALE_FR =
# Same for ignrcas3
# NEED_LOCALE_GR =
-----------------------------------------------------------------------
Summary of changes:
doc/ChangeLog | 5 +
doc/gawk.info | 1104 ++++++++++++++++++++++++++++---------------------------
doc/gawk.texi | 24 +-
doc/gawktexi.in | 24 +-
pc/Makefile.tst | 2 +-
5 files changed, 611 insertions(+), 548 deletions(-)
hooks/post-receive
--
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