Merge branch 'gawk-4.2-stable'

14 files changed, 442 insertions, 413 deletions

diff --git a/doc/ChangeLog b/doc/ChangeLog
index 0e46d59e..fe48e088 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2018-02-17         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in: Further fix to NONFATAL stuff. Thanks to
+	Antonio Giovanni Colombo for the report.
+
 2018-02-16         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in: Fix NONFATAL stuff to cover input redirections too.
diff --git a/doc/gawk.info b/doc/gawk.info
index e3094117..6ad34ae9 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -10997,12 +10997,11 @@ they are not special:
      The following elements allow you to change 'gawk''s behavior:
 
      'PROCINFO["NONFATAL"]'
-          If this element exists, then I/O errors for all output
-          redirections become nonfatal.  *Note Nonfatal::.
+          If this element exists, then I/O errors for all redirections
+          become nonfatal.  *Note Nonfatal::.
 
-     'PROCINFO["OUTPUT_NAME", "NONFATAL"]'
-          Make output errors for OUTPUT_NAME be nonfatal.  *Note
-          Nonfatal::.
+     'PROCINFO["NAME", "NONFATAL"]'
+          Make I/O errors for NAME be nonfatal.  *Note Nonfatal::.
 
      'PROCINFO["COMMAND", "pty"]'
           For two-way communication to COMMAND, use a pseudo-tty instead
@@ -33751,7 +33750,7 @@ Index
 * dark corner, field separators:         Full Line Fields.    (line  22)
 * dark corner, FILENAME variable:        Getline Notes.       (line  19)
 * dark corner, FILENAME variable <1>:    Auto-set.            (line 108)
-* dark corner, FNR/NR variables:         Auto-set.            (line 390)
+* dark corner, FNR/NR variables:         Auto-set.            (line 389)
 * dark corner, format-control characters: Control Letters.    (line  18)
 * dark corner, format-control characters <1>: Control Letters.
                                                               (line  93)
@@ -33986,7 +33985,7 @@ Index
                                                               (line   6)
 * differences in awk and gawk, RS/RT variables: gawk split records.
                                                               (line  58)
-* differences in awk and gawk, RT variable: Auto-set.         (line 328)
+* differences in awk and gawk, RT variable: Auto-set.         (line 327)
 * differences in awk and gawk, single-character fields: Single Character Fields.
                                                               (line   6)
 * differences in awk and gawk, split() function: String Functions.
@@ -33994,7 +33993,7 @@ Index
 * differences in awk and gawk, strings:  Scalar Constants.    (line  20)
 * differences in awk and gawk, strings, storing: gawk split records.
                                                               (line  76)
-* differences in awk and gawk, SYMTAB variable: Auto-set.     (line 332)
+* differences in awk and gawk, SYMTAB variable: Auto-set.     (line 331)
 * differences in awk and gawk, TEXTDOMAIN variable: User-modified.
                                                               (line 155)
 * differences in awk and gawk, trunc-mod operation: Arithmetic Ops.
@@ -34317,7 +34316,7 @@ Index
                                                               (line  12)
 * FNR variable:                          Records.             (line   6)
 * FNR variable <1>:                      Auto-set.            (line 118)
-* FNR variable, changing:                Auto-set.            (line 390)
+* FNR variable, changing:                Auto-set.            (line 389)
 * for statement:                         For Statement.       (line   6)
 * for statement, looping over arrays:    Scanning an Array.   (line  20)
 * fork() extension function:             Extension Sample Fork.
@@ -34497,13 +34496,13 @@ Index
 * gawk, regular expressions, precedence: Regexp Operators.    (line 161)
 * gawk, RT variable in:                  awk split records.   (line 124)
 * gawk, RT variable in <1>:              Multiple Line.       (line 130)
-* gawk, RT variable in <2>:              Auto-set.            (line 328)
+* gawk, RT variable in <2>:              Auto-set.            (line 327)
 * gawk, See Also awk:                    Preface.             (line  34)
 * gawk, source code, obtaining:          Getting.             (line   6)
 * gawk, splitting fields and:            Testing field creation.
                                                               (line   6)
 * gawk, string-translation functions:    I18N Functions.      (line   6)
-* gawk, SYMTAB array in:                 Auto-set.            (line 332)
+* gawk, SYMTAB array in:                 Auto-set.            (line 331)
 * gawk, TEXTDOMAIN variable in:          User-modified.       (line 155)
 * gawk, timestamps:                      Time Functions.      (line   6)
 * gawk, uses for:                        Preface.             (line  34)
@@ -34973,7 +34972,7 @@ Index
 * not Boolean-logic operator:            Boolean Ops.         (line   6)
 * NR variable:                           Records.             (line   6)
 * NR variable <1>:                       Auto-set.            (line 143)
-* NR variable, changing:                 Auto-set.            (line 390)
+* NR variable, changing:                 Auto-set.            (line 389)
 * null strings:                          awk split records.   (line 114)
 * null strings <1>:                      Regexp Field Splitting.
                                                               (line  43)
@@ -35440,7 +35439,7 @@ Index
 * right shift:                           Bitwise Functions.   (line  54)
 * right shift, bitwise:                  Bitwise Functions.   (line  32)
 * Ritchie, Dennis:                       Basic Data Typing.   (line  54)
-* RLENGTH variable:                      Auto-set.            (line 315)
+* RLENGTH variable:                      Auto-set.            (line 314)
 * RLENGTH variable, match() function and: String Functions.   (line 227)
 * Robbins, Arnold:                       Command Line Field Separator.
                                                               (line  71)
@@ -35468,11 +35467,11 @@ Index
 * RS variable <1>:                       User-modified.       (line 136)
 * RS variable, multiline records and:    Multiple Line.       (line  17)
 * rshift:                                Bitwise Functions.   (line  54)
-* RSTART variable:                       Auto-set.            (line 321)
+* RSTART variable:                       Auto-set.            (line 320)
 * RSTART variable, match() function and: String Functions.    (line 227)
 * RT variable:                           awk split records.   (line 124)
 * RT variable <1>:                       Multiple Line.       (line 130)
-* RT variable <2>:                       Auto-set.            (line 328)
+* RT variable <2>:                       Auto-set.            (line 327)
 * Rubin, Paul:                           History.             (line  30)
 * Rubin, Paul <1>:                       Contributors.        (line  16)
 * rule, definition of:                   Getting Started.     (line  21)
@@ -35490,7 +35489,7 @@ Index
 * scanning arrays:                       Scanning an Array.   (line   6)
 * scanning multidimensional arrays:      Multiscanning.       (line  11)
 * Schorr, Andrew:                        Acknowledgments.     (line  60)
-* Schorr, Andrew <1>:                    Auto-set.            (line 360)
+* Schorr, Andrew <1>:                    Auto-set.            (line 359)
 * Schorr, Andrew <2>:                    Contributors.        (line 136)
 * Schreiber, Bert:                       Acknowledgments.     (line  38)
 * Schreiber, Rita:                       Acknowledgments.     (line  38)
@@ -35576,7 +35575,7 @@ Index
 * sidebar, Beware The Smoke and Mirrors!: Bitwise Functions.  (line 127)
 * sidebar, Changing FS Does Not Affect the Fields: Full Line Fields.
                                                               (line  14)
-* sidebar, Changing NR and FNR:          Auto-set.            (line 388)
+* sidebar, Changing NR and FNR:          Auto-set.            (line 387)
 * sidebar, Controlling Output Buffering with system(): I/O Functions.
                                                               (line 163)
 * sidebar, Escape Sequences for Metacharacters: Escape Sequences.
@@ -35744,7 +35743,7 @@ Index
 * Sumner, Andrew:                        Other Versions.      (line  73)
 * supplementary groups of gawk process:  Auto-set.            (line 271)
 * switch statement:                      Switch Statement.    (line   6)
-* SYMTAB array:                          Auto-set.            (line 332)
+* SYMTAB array:                          Auto-set.            (line 331)
 * syntactic ambiguity: /= operator vs. /=.../ regexp constant: Assignment Ops.
                                                               (line 149)
 * system:                                I/O Functions.       (line 106)
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-Ref: Time Functions-Footnote-1582993
-Ref: Time Functions-Footnote-2583061
-Ref: Time Functions-Footnote-3583219
-Ref: Time Functions-Footnote-4583330
-Ref: Time Functions-Footnote-5583442
-Ref: Time Functions-Footnote-6583669
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+Node: Library Exercises704905
+Node: Sample Programs705370
+Node: Running Examples706140
+Node: Clones706868
+Node: Cut Program708092
+Node: Egrep Program718021
+Ref: Egrep Program-Footnote-1725533
+Node: Id Program725643
+Node: Split Program729323
+Ref: Split Program-Footnote-1732781
+Node: Tee Program732910
+Node: Uniq Program735700
+Node: Wc Program743126
+Ref: Wc Program-Footnote-1747381
+Node: Miscellaneous Programs747475
+Node: Dupword Program748688
+Node: Alarm Program750718
+Node: Translate Program755573
+Ref: Translate Program-Footnote-1760138
+Node: Labels Program760408
+Ref: Labels Program-Footnote-1763759
+Node: Word Sorting763843
+Node: History Sorting767915
+Node: Extract Program769750
+Node: Simple Sed777280
+Node: Igawk Program780354
+Ref: Igawk Program-Footnote-1794685
+Ref: Igawk Program-Footnote-2794887
+Ref: Igawk Program-Footnote-3795009
+Node: Anagram Program795124
+Node: Signature Program798186
+Node: Programs Summary799433
+Node: Programs Exercises800647
+Ref: Programs Exercises-Footnote-1804776
+Node: Advanced Features804867
+Node: Nondecimal Data806857
+Node: Array Sorting808448
+Node: Controlling Array Traversal809148
+Ref: Controlling Array Traversal-Footnote-1817516
+Node: Array Sorting Functions817634
+Ref: Array Sorting Functions-Footnote-1822725
+Node: Two-way I/O822921
+Ref: Two-way I/O-Footnote-1829473
+Ref: Two-way I/O-Footnote-2829660
+Node: TCP/IP Networking829742
+Node: Profiling832860
+Ref: Profiling-Footnote-1841532
+Node: Advanced Features Summary841855
+Node: Internationalization843699
+Node: I18N and L10N845179
+Node: Explaining gettext845866
+Ref: Explaining gettext-Footnote-1851758
+Ref: Explaining gettext-Footnote-2851943
+Node: Programmer i18n852108
+Ref: Programmer i18n-Footnote-1857057
+Node: Translator i18n857106
+Node: String Extraction857900
+Ref: String Extraction-Footnote-1859032
+Node: Printf Ordering859118
+Ref: Printf Ordering-Footnote-1861904
+Node: I18N Portability861968
+Ref: I18N Portability-Footnote-1864424
+Node: I18N Example864487
+Ref: I18N Example-Footnote-1867293
+Node: Gawk I18N867366
+Node: I18N Summary868011
+Node: Debugger869352
+Node: Debugging870375
+Node: Debugging Concepts870816
+Node: Debugging Terms872625
+Node: Awk Debugging875200
+Node: Sample Debugging Session876106
+Node: Debugger Invocation876640
+Node: Finding The Bug878026
+Node: List of Debugger Commands884504
+Node: Breakpoint Control885837
+Node: Debugger Execution Control889531
+Node: Viewing And Changing Data892893
+Node: Execution Stack896267
+Node: Debugger Info897904
+Node: Miscellaneous Debugger Commands901975
+Node: Readline Support907037
+Node: Limitations907933
+Node: Debugging Summary910042
+Node: Arbitrary Precision Arithmetic911321
+Node: Computer Arithmetic912806
+Ref: table-numeric-ranges916572
+Ref: table-floating-point-ranges917065
+Ref: Computer Arithmetic-Footnote-1917723
+Node: Math Definitions917780
+Ref: table-ieee-formats921096
+Ref: Math Definitions-Footnote-1921699
+Node: MPFR features921804
+Node: FP Math Caution923522
+Ref: FP Math Caution-Footnote-1924594
+Node: Inexactness of computations924963
+Node: Inexact representation925923
+Node: Comparing FP Values927283
+Node: Errors accumulate928365
+Node: Getting Accuracy929798
+Node: Try To Round932508
+Node: Setting precision933407
+Ref: table-predefined-precision-strings934104
+Node: Setting the rounding mode935934
+Ref: table-gawk-rounding-modes936308
+Ref: Setting the rounding mode-Footnote-1940239
+Node: Arbitrary Precision Integers940418
+Ref: Arbitrary Precision Integers-Footnote-1943593
+Node: Checking for MPFR943742
+Node: POSIX Floating Point Problems945216
+Ref: POSIX Floating Point Problems-Footnote-1949087
+Node: Floating point summary949125
+Node: Dynamic Extensions951315
+Node: Extension Intro952868
+Node: Plugin License954134
+Node: Extension Mechanism Outline954931
+Ref: figure-load-extension955370
+Ref: figure-register-new-function956935
+Ref: figure-call-new-function958027
+Node: Extension API Description960089
+Node: Extension API Functions Introduction961731
+Node: General Data Types967271
+Ref: General Data Types-Footnote-1975632
+Node: Memory Allocation Functions975931
+Ref: Memory Allocation Functions-Footnote-1980141
+Node: Constructor Functions980240
+Node: Registration Functions983826
+Node: Extension Functions984511
+Node: Exit Callback Functions989726
+Node: Extension Version String990976
+Node: Input Parsers991639
+Node: Output Wrappers1004360
+Node: Two-way processors1008872
+Node: Printing Messages1011137
+Ref: Printing Messages-Footnote-11012308
+Node: Updating ERRNO1012461
+Node: Requesting Values1013200
+Ref: table-value-types-returned1013937
+Node: Accessing Parameters1014873
+Node: Symbol Table Access1016108
+Node: Symbol table by name1016620
+Node: Symbol table by cookie1018409
+Ref: Symbol table by cookie-Footnote-11022594
+Node: Cached values1022658
+Ref: Cached values-Footnote-11026194
+Node: Array Manipulation1026347
+Ref: Array Manipulation-Footnote-11027438
+Node: Array Data Types1027475
+Ref: Array Data Types-Footnote-11030133
+Node: Array Functions1030225
+Node: Flattening Arrays1034723
+Node: Creating Arrays1041699
+Node: Redirection API1046466
+Node: Extension API Variables1049299
+Node: Extension Versioning1050010
+Ref: gawk-api-version1050439
+Node: Extension GMP/MPFR Versioning1052170
+Node: Extension API Informational Variables1053798
+Node: Extension API Boilerplate1054871
+Node: Changes from API V11058845
+Node: Finding Extensions1060417
+Node: Extension Example1060976
+Node: Internal File Description1061774
+Node: Internal File Ops1065854
+Ref: Internal File Ops-Footnote-11077204
+Node: Using Internal File Ops1077344
+Ref: Using Internal File Ops-Footnote-11079727
+Node: Extension Samples1080001
+Node: Extension Sample File Functions1081530
+Node: Extension Sample Fnmatch1089179
+Node: Extension Sample Fork1090666
+Node: Extension Sample Inplace1091884
+Node: Extension Sample Ord1095101
+Node: Extension Sample Readdir1095937
+Ref: table-readdir-file-types1096826
+Node: Extension Sample Revout1097631
+Node: Extension Sample Rev2way1098220
+Node: Extension Sample Read write array1098960
+Node: Extension Sample Readfile1100902
+Node: Extension Sample Time1101997
+Node: Extension Sample API Tests1103345
+Node: gawkextlib1103837
+Node: Extension summary1106755
+Node: Extension Exercises1110457
+Node: Language History1111955
+Node: V7/SVR3.11113611
+Node: SVR41115763
+Node: POSIX1117197
+Node: BTL1118577
+Node: POSIX/GNU1119306
+Node: Feature History1125084
+Node: Common Extensions1140943
+Node: Ranges and Locales1142226
+Ref: Ranges and Locales-Footnote-11146842
+Ref: Ranges and Locales-Footnote-21146869
+Ref: Ranges and Locales-Footnote-31147104
+Node: Contributors1147325
+Node: History summary1153270
+Node: Installation1154650
+Node: Gawk Distribution1155594
+Node: Getting1156078
+Node: Extracting1157041
+Node: Distribution contents1158679
+Node: Unix Installation1165159
+Node: Quick Installation1165841
+Node: Shell Startup Files1168255
+Node: Additional Configuration Options1169344
+Node: Configuration Philosophy1171509
+Node: Non-Unix Installation1173878
+Node: PC Installation1174338
+Node: PC Binary Installation1175176
+Node: PC Compiling1175611
+Node: PC Using1176728
+Node: Cygwin1179943
+Node: MSYS1181042
+Node: VMS Installation1181543
+Node: VMS Compilation1182334
+Ref: VMS Compilation-Footnote-11183563
+Node: VMS Dynamic Extensions1183621
+Node: VMS Installation Details1185306
+Node: VMS Running1187559
+Node: VMS GNV1191838
+Node: VMS Old Gawk1192573
+Node: Bugs1193044
+Node: Bug address1193707
+Node: Usenet1196499
+Node: Maintainers1197276
+Node: Other Versions1198537
+Node: Installation summary1205299
+Node: Notes1206501
+Node: Compatibility Mode1207366
+Node: Additions1208148
+Node: Accessing The Source1209073
+Node: Adding Code1210510
+Node: New Ports1216729
+Node: Derived Files1221217
+Ref: Derived Files-Footnote-11226863
+Ref: Derived Files-Footnote-21226898
+Ref: Derived Files-Footnote-31227496
+Node: Future Extensions1227610
+Node: Implementation Limitations1228268
+Node: Extension Design1229451
+Node: Old Extension Problems1230605
+Ref: Old Extension Problems-Footnote-11232123
+Node: Extension New Mechanism Goals1232180
+Ref: Extension New Mechanism Goals-Footnote-11235544
+Node: Extension Other Design Decisions1235733
+Node: Extension Future Growth1237846
+Node: Old Extension Mechanism1238682
+Node: Notes summary1240445
+Node: Basic Concepts1241627
+Node: Basic High Level1242308
+Ref: figure-general-flow1242590
+Ref: figure-process-flow1243275
+Ref: Basic High Level-Footnote-11246576
+Node: Basic Data Typing1246761
+Node: Glossary1250089
+Node: Copying1281927
+Node: GNU Free Documentation License1319470
+Node: Index1344590
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index 36116543..5c812c7d 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -15692,11 +15692,11 @@ The following elements allow you to change @command{gawk}'s behavior:
 
 @table @code
 @item PROCINFO["NONFATAL"]
-If this element exists, then I/O errors for all output redirections become nonfatal.
+If this element exists, then I/O errors for all redirections become nonfatal.
 @xref{Nonfatal}.
 
-@item PROCINFO["@var{output_name}", "NONFATAL"]
-Make output errors for @var{output_name} be nonfatal.
+@item PROCINFO["@var{name}", "NONFATAL"]
+Make I/O errors for @var{name} be nonfatal.
 @xref{Nonfatal}.
 
 @item PROCINFO["@var{command}", "pty"]
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index c1172b82..0cd3bd47 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -15013,8 +15013,8 @@ The following elements allow you to change @command{gawk}'s behavior:
 If this element exists, then I/O errors for all redirections become nonfatal.
 @xref{Nonfatal}.
 
-@item PROCINFO["@var{output_name}", "NONFATAL"]
-Make I/O errors for @var{output_name} be nonfatal.
+@item PROCINFO["@var{name}", "NONFATAL"]
+Make I/O errors for @var{name} be nonfatal.
 @xref{Nonfatal}.
 
 @item PROCINFO["@var{command}", "pty"]
diff --git a/doc/it/ChangeLog b/doc/it/ChangeLog
index af808bbf..db2aa21a 100644
--- a/doc/it/ChangeLog
+++ b/doc/it/ChangeLog
@@ -1,3 +1,7 @@
+2017-02-17         Antonio Giovanni Colombo   <azc100@gmail.com>
+
+	* gawk.1: Synchronized with English version.
+
 2018-02-10         Antonio Giovanni Colombo   <azc100@gmail.com>
 
 	* gawktexi.in: More updates.
diff --git a/doc/it/gawk.1 b/doc/it/gawk.1
index 234e82b1..b1ab35ae 100755
--- a/doc/it/gawk.1
+++ b/doc/it/gawk.1
@@ -7,7 +7,8 @@
 .\"Febbraio 2014 - da versione 4.0.1e
 .\"Aggiornam. a gawk-4.1.2 di Antonio G. Colombo - Aprile 2015
 .\"Aggiornam. a gawk-4.1.3 di Marco Curreli - revis. A.G. Colombo - Giugno 2016
-.\"Aggiornam. a gawk-4.2.0 di A.G. Colombo. - revis. M. Curreli - Dicembre 2017
+.\"Aggiornam. a gawk-4.2.0 di A.G. Colombo - revis. M. Curreli - Dicembre 2017
+.\"Aggiornam. a gawk-4.2.1 di A.G. Colombo - revis. M. Curreli - Febbraio 2018
 
 .ds PX \s-1POSIX\s+1
 .ds UX \s-1UNIX\s+1
@@ -24,7 +25,7 @@
 .		if \w'\(rq' .ds rq "\(rq
 .	\}
 .\}
-.TH GAWK 1 "Oct 01 2017" "Free Software Foundation" "Utility Commands"
+.TH GAWK 1 "Feb 15 2018" "Free Software Foundation" "Utility Commands"
 .SH NOME
 gawk \- linguaggio per il riconoscimento e il trattamento di espressioni
 regolari
@@ -1261,12 +1262,12 @@ cambiare il comportamento di
 .IR gawk :
 .TP
 \fBPROCINFO["NONFATAL"]\fR
-Se è presente, gli errori di I/O per tutte le ridirezioni verso l'output
+Se presente, gli errori di I/O per tutte le ridirezioni
 diventano non fatali.
 .TP
-\fBPROCINFO["\fInome_output\fB", "NONFATAL"]\fR
+\fBPROCINFO["\fInome\fB", "NONFATAL"]\fR
 Rendono gli errori relativi a
-.I nome_output
+.I nome
 non fatali.
 .TP
 \fBPROCINFO["\fIcomando\fB", "pty"]\fR
@@ -4170,7 +4171,7 @@ Lo ringraziamo.
 .SH COPYING PERMISSIONS
 Copyright \(co 1989, 1991, 1992, 1993, 1994, 1995, 1996,
 1997, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2007, 2009,
-2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
+2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
 Free Software Foundation, Inc.
 .PP
 Permission is granted to make and distribute verbatim copies of
diff --git a/extension/ChangeLog b/extension/ChangeLog
index 1abe1b1c..0b09032d 100644
--- a/extension/ChangeLog
+++ b/extension/ChangeLog
@@ -1,3 +1,8 @@
+2018-02-17         Michal Jaegermann     <michal.jnn@gmail.com>.
+
+	* filefuncs.3am, filefuncs.c, fnmatch.3am, revoutput.3am,
+	revtwoway.3am: Spelling and typo fixes.
+
 2018-02-14         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* configure.ac: Add stuff for finding gettext. Helps in
diff --git a/extension/filefuncs.3am b/extension/filefuncs.3am
index e033f918..fb2db37d 100644
--- a/extension/filefuncs.3am
+++ b/extension/filefuncs.3am
@@ -173,10 +173,10 @@ The
 .B fts()
 function provides a hook to the
 .IR fts (3)
-set of routines for traversing file heirarchies.
+set of routines for traversing file hierarchies.
 Instead of returning data about one file at a time in a stream,
 it fills in a multi-dimensional array with data about each file and
-directory encountered in the requested heirarchies.
+directory encountered in the requested hierarchies.
 .PP
 The arguments are as follows:
 .TP
@@ -211,11 +211,11 @@ This flag is mutually exclusive with
 .B FTS_NOCHDIR
 As a performance optimization, the
 .IR fts (3)
-routines change directory as they traverse a file heirarchy.
+routines change directory as they traverse a file hierarchy.
 This flag disables that optimization.
 .TP
 .B FTS_COMFOLLOW
-Immediatly follow a symbolic link named in
+Immediately follow a symbolic link named in
 .BR pathlist ,
 whether or not
 .B FTS_LOGICAL
@@ -314,7 +314,7 @@ already provides powerful array sorting facilities.  While an
 .IR fts_read() \-like
 interface could have been provided, this felt less natural than
 simply creating a multi-dimensional array to represent the file
-heirarchy and its information.
+hierarchy and its information.
 .PP
 Nothing prevents AWK code from changing the predefined
 .BI FTS_ xx
diff --git a/extension/filefuncs.c b/extension/filefuncs.c
index 15f15473..1ea25dbc 100644
--- a/extension/filefuncs.c
+++ b/extension/filefuncs.c
@@ -592,7 +592,7 @@ init_filefuncs(void)
 }
 
 #ifdef __MINGW32__
-/*  do_fts --- walk a heirarchy and fill in an array */
+/*  do_fts --- walk a hierarchy and fill in an array */
 
 /*
  * Usage from awk:
@@ -688,10 +688,10 @@ fill_default_elements(awk_array_t element_array, const FTSENT *const fentry, awk
 	}
 }
 
-/* process --- process the heirarchy */
+/* process --- process the hierarchy */
 
 static void
-process(FTS *heirarchy, awk_array_t destarray, int seedot, int skipset)
+process(FTS *hierarchy, awk_array_t destarray, int seedot, int skipset)
 {
 	FTSENT *fentry;
 	awk_value_t index, value;
@@ -700,7 +700,7 @@ process(FTS *heirarchy, awk_array_t destarray, int seedot, int skipset)
 
 	/* path is full path,  pathlen is length thereof */
 	/* name is name in directory, namelen is length thereof */
-	while ((fentry = fts_read(heirarchy)) != NULL) {
+	while ((fentry = fts_read(hierarchy)) != NULL) {
 		bad_ret = awk_false;
 
 		switch (fentry->fts_info) {
@@ -708,7 +708,7 @@ process(FTS *heirarchy, awk_array_t destarray, int seedot, int skipset)
 			/* directory */
 
 			if (skipset && fentry->fts_level == 0)
-				fts_set(heirarchy, fentry, FTS_SKIP);
+				fts_set(hierarchy, fentry, FTS_SKIP);
 
 			/* create array to hold entries */
 			/* this will be empty if doing FTS_SKIP */
@@ -812,7 +812,7 @@ process(FTS *heirarchy, awk_array_t destarray, int seedot, int skipset)
 	}
 }
 
-/*  do_fts --- walk a heirarchy and fill in an array */
+/*  do_fts --- walk a hierarchy and fill in an array */
 
 /*
  * Usage from awk:
@@ -826,7 +826,7 @@ do_fts(int nargs, awk_value_t *result, struct awk_ext_func *unused)
 	awk_value_t pathlist, flagval, dest;
 	awk_flat_array_t *path_array = NULL;
 	char **pathvector = NULL;
-	FTS *heirarchy;
+	FTS *hierarchy;
 	int flags;
 	size_t i, count;
 	int ret = -1;
@@ -899,9 +899,9 @@ do_fts(int nargs, awk_value_t *result, struct awk_ext_func *unused)
 	}
 
 	/* let's do it! */
-	if ((heirarchy = fts_open(pathvector, flags, NULL)) != NULL) {
-		process(heirarchy, dest.array_cookie, (flags & FTS_SEEDOT) != 0, (flags & FTS_SKIP) != 0);
-		fts_close(heirarchy);
+	if ((hierarchy = fts_open(pathvector, flags, NULL)) != NULL) {
+		process(hierarchy, dest.array_cookie, (flags & FTS_SEEDOT) != 0, (flags & FTS_SKIP) != 0);
+		fts_close(hierarchy);
 
 		if (fts_errors == 0)
 			ret = 0;
diff --git a/extension/fnmatch.3am b/extension/fnmatch.3am
index 47a97d11..d82a154d 100644
--- a/extension/fnmatch.3am
+++ b/extension/fnmatch.3am
@@ -70,7 +70,7 @@ flag as defined in
 .PP
 .SH NOTES
 Nothing prevents AWK code from changing the predefined
-variabale
+variable
 .BR FNM_NOMATCH ,
 but doing so may cause strange results.
 .\" .SH BUGS
diff --git a/extension/revoutput.3am b/extension/revoutput.3am
index 58ac1b09..fbf33dbe 100644
--- a/extension/revoutput.3am
+++ b/extension/revoutput.3am
@@ -14,7 +14,7 @@ extension
 adds a simple output wrapper that reverses the characters in each output
 line.
 It's main purpose is to show how to write an output wrapper, although
-it may be mildy amusing for the unwary.
+it may be mildly amusing for the unwary.
 .\" .SH BUGS
 .SH EXAMPLE
 .ft CW
diff --git a/extension/revtwoway.3am b/extension/revtwoway.3am
index 09bfe32d..4aa71f7f 100644
--- a/extension/revtwoway.3am
+++ b/extension/revtwoway.3am
@@ -22,7 +22,7 @@ extension
 adds a simple two-way processor that reverses the characters
 in each line sent to it for reading back by the AWK program.
 It's main purpose is to show how to write a two-way extension, although
-it may also be mildy amusing.
+it may also be mildly amusing.
 .\" .SH BUGS
 .SH "SEE ALSO"
 .IR "GAWK: Effective AWK Programming" ,
diff --git a/pc/ChangeLog b/pc/ChangeLog
index 0ac91608..866d133d 100644
--- a/pc/ChangeLog
+++ b/pc/ChangeLog
@@ -1,3 +1,8 @@
+2018-02-17  Eli Zaretskii  <eliz@gnu.org>
+
+	* Makefile.tst (BASIC_TESTS): Add uplus.
+	(mpfruplus, uplus): New tests.
+
 2018-02-10  Eli Zaretskii  <eliz@gnu.org>
 
 	* Makefile.tst (MPFR_TESTS): Update to match test/Makefile.in.
diff --git a/pc/Makefile.tst b/pc/Makefile.tst
index a5d5e373..675d0044 100644
--- a/pc/Makefile.tst
+++ b/pc/Makefile.tst
@@ -180,7 +180,7 @@ BASIC_TESTS = \
 	splitdef splitvar splitwht status-close strcat1 strnum1 strnum2 strtod \
 	subamp subback subi18n subsepnm subslash substr swaplns synerr1 synerr2 \
 	tradanch tweakfld \
-	uninit2 uninit3 uninit4 uninit5 uninitialized unterm uparrfs \
+	uninit2 uninit3 uninit4 uninit5 uninitialized unterm uparrfs uplus \
 	wideidx wideidx2 widesub widesub2 widesub3 widesub4 wjposer1 \
 	zero2 zeroe0 zeroflag
 
@@ -1058,6 +1058,11 @@ mpfrstrtonum:
 	@$(AWK) -M -f "$(srcdir)"/$@.awk > _$@ 2>&1
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+mpfruplus:
+	@echo $@
+	@$(AWK) -M -f "$(srcdir)"/uplus.awk > _$@ 2>&1
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
 mpgforcenum:
 	@echo $@
 	@$(AWK) -M -f "$(srcdir)"/$@.awk > _$@ 2>&1
@@ -2473,6 +2478,11 @@ uparrfs:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+uplus:
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
 wjposer1:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@