Merge branch 'gawk-4.1-stable'

21 files changed, 321 insertions, 149 deletions

diff --git a/ChangeLog b/ChangeLog
index 4f1207c9..4ead366b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,36 @@
+2016-08-01         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* README, NEWS: Mark DJGPP port as unsupported.
+
+2016-08-01         Andrew J. Schorr     <aschorr@telemetry-investments.com>
+
+	* mpfr.c (mpg_tofloat): Always set precision to avoid hysteresis effects
+	from previous calculations using the same temporary mpfr variables.
+
+2016-08-01         Andrew J. Schorr     <aschorr@telemetry-investments.com>
+
+	* mpfr.c (default_prec): Add new static variable to show current PREC
+	setting in effect.
+	(init_mpfr, set_PREC): Save mpfr_set_default_prec argument in
+	default_prec.
+	(do_mpfr_func): If the argument's precision exceeds the default
+	precision, boost the result's precision to match it. This fixes a
+	bug where we used to copy the argument's precision, regardless of
+	whether it was higher or lower than the PREC setting.
+
+2016-07-24         Norihiro Tanaka      <noritnk@kcn.ne.jp>
+
+	* re.c (research): Now that the dfa matcher correctly runs even
+	in multibyte locales, try it if even if need_start is true.
+	However, if start > 0, avoid dfa matcher, since it can't handle
+	the case where the search starts in the middle of a string.
+
+	Unrelated:
+
+	* eval.c (load_casetable): Reset casetable[i] to `i' if i
+	should not be mapped to upper case. Fixes inconsistencies between
+	dfa and regex in some single bytes locales; notably el_GR.iso88597.
+
 2016-07-23         Arnold D. Robbins     <arnold@skeeve.com>
 
 	Make result of close on a pipe match result of system.
diff --git a/NEWS b/NEWS
index 5ac02a1a..3293534a 100644
--- a/NEWS
+++ b/NEWS
@@ -120,7 +120,9 @@ Changes from 4.1.3 to 4.1.4
 13. A new environment variable GAWK_LOCALE_DIR may be set to locate the .mo
     file for gawk itself.
 
-14. A number of bugs have been fixed. See the ChangeLog.
+14. The DJGPP port is now officially deprecated.
+
+15. A number of bugs have been fixed. See the ChangeLog.
 
 Changes from 4.1.2 to 4.1.3
 ---------------------------
diff --git a/README b/README
index b8add239..57e6c32c 100644
--- a/README
+++ b/README
@@ -80,7 +80,7 @@ Arnold Robbins
 
 BUG REPORTS AND FIXES, non-Unix systems:
 
-MS-DOS with DJGPP:
+MS-DOS with DJGPP: (This port is deprecated.)
 	Scott Deifik
 	scottd.mail@sbcglobal.net
 
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 1c01a45d..2cada32d 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,11 @@
+2016-08-01         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in: Mark DJGPP port as unsupported.
+
+2016-07-24         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in: Fix a typo. Thanks to Marco Curreli for reporting.
+
 2016-07-23         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in: Document return value of close on a pipe now like
diff --git a/doc/gawk.info b/doc/gawk.info
index 650044e6..97c9d3c0 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -26742,7 +26742,7 @@ File: gawk.info,  Node: Extension Exercises,  Prev: Extension summary,  Up: Dyna
      the input file is a terminal.  (Hint: this function is usually
      expensive to call; try to call it just once.)  The content of the
      prompt should come from a variable settable by 'awk'-level code.
-     You can write the prompt to stanard error.  However, for best
+     You can write the prompt to standard error.  However, for best
      results, open a new file descriptor (or file pointer) on '/dev/tty'
      and print the prompt there, in case standard error has been
      redirected.
@@ -27732,7 +27732,7 @@ Info file, in approximate chronological order:
    * Fred Fish provided the port to Amiga systems and its documentation.
      (With Fred's sad passing, this is no longer supported.)
 
-   * Scott Deifik currently maintains the MS-DOS port using DJGPP.
+   * Scott Deifik maintained the MS-DOS port using DJGPP.
 
    * Eli Zaretskii currently maintains the MS-Windows port using MinGW.
 
@@ -28424,8 +28424,7 @@ File: gawk.info,  Node: PC Compiling,  Next: PC Testing,  Prev: PC Binary Instal
 B.3.1.2 Compiling 'gawk' for PC Operating Systems
 .................................................
 
-'gawk' can be compiled for MS-DOS, Windows32, and OS/2 using the GNU
-development tools from DJ Delorie (DJGPP: MS-DOS only), MinGW
+'gawk' can be compiled for MS-DOS, Windows32, and OS/2 using MinGW
 (Windows32) or Eberhard Mattes (EMX: MS-DOS, Windows32 and OS/2).  The
 file 'README_d/README.pc' in the 'gawk' distribution contains additional
 notes, and 'pc/Makefile' contains important information on compilation
@@ -28440,11 +28439,9 @@ be edited in order to work with your 'make' utility.
 
    The 'Makefile' supports a number of targets for building various
 MS-DOS and Windows32 versions.  A list of targets is printed if the
-'make' command is given without a target.  As an example, to build
-'gawk' using the DJGPP tools, enter 'make djgpp'.  (The DJGPP tools
-needed for the build may be found at
-<ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/>.)  To build a native
-MS-Windows binary of 'gawk' using the MinGW tools, type 'make mingw32'.
+'make' command is given without a target.  As an example, to build a
+native MS-Windows binary of 'gawk' using the MinGW tools, type 'make
+mingw32'.
 
    The 32 bit EMX version of 'gawk' works "out of the box" under OS/2.
 However, it is highly recommended to use GCC 2.95.3 for the compilation.
@@ -28553,7 +28550,7 @@ is set to 'e:' the complete default search path is
 
    An 'sh'-like shell (as opposed to 'command.com' under MS-DOS or
 'cmd.exe' under MS-Windows or OS/2) may be useful for 'awk' programming.
-The DJGPP collection of tools includes an MS-DOS port of Bash, and
+The DJGPP collection of tools(1) includes an MS-DOS port of Bash, and
 several shells are available for OS/2, including 'ksh'.
 
    Under MS-Windows, OS/2 and MS-DOS, 'gawk' (and many other text
@@ -28615,6 +28612,10 @@ or:
 With proper quoting, in the first example the setting of 'RS' can be
 moved into the 'BEGIN' rule.
 
+   ---------- Footnotes ----------
+
+   (1) Available from <ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/>.
+
 
 File: gawk.info,  Node: Cygwin,  Next: MSYS,  Prev: PC Using,  Up: PC Installation
 
@@ -29031,8 +29032,6 @@ this Info file.
 
 Unix and POSIX          Arnold Robbins, <arnold@skeeve.com>
 systems                 
-MS-DOS with DJGPP       Scott Deifik, <scottd.mail@sbcglobal.net>
-                        
 MS-Windows with MinGW   Eli Zaretskii, <eliz@gnu.org>
                         
 OS/2                    Andreas Buening, <andreas.buening@nexgo.de>
@@ -29045,6 +29044,10 @@ z/OS (OS/390)           Daniel Richard G. <skunk@iSKUNK.ORG>
    If your bug is also reproducible under Unix, send a copy of your
 report to the <bug-gawk@gnu.org> email list as well.
 
+   The DJGPP port is no longer supported; it will remain in the code
+base for a while in case a volunteer wishes to take it over.  If this
+does not happen, then eventually code for this port will be removed.
+
 
 File: gawk.info,  Node: Other Versions,  Next: Installation summary,  Prev: Bugs,  Up: Installation
 
@@ -29216,9 +29219,9 @@ B.6 Summary
           ./configure && make && make check
 
    * 'gawk' may be built on non-POSIX systems as well.  The currently
-     supported systems are MS-Windows using DJGPP, MSYS, MinGW, and
-     Cygwin, OS/2 using EMX, and both Vax/VMS and OpenVMS. Instructions
-     for each system are included in this major node.
+     supported systems are MS-Windows using MSYS, MinGW, and Cygwin,
+     OS/2 using EMX, and both Vax/VMS and OpenVMS. Instructions for each
+     system are included in this major node.
 
    * Bug reports should be sent via email to <bug-gawk@gnu.org>.  Bug
      reports should be in English and should include the version of
@@ -32995,9 +32998,9 @@ Index
 * compiled programs:                     Basic High Level.    (line  13)
 * compiled programs <1>:                 Glossary.            (line 218)
 * compiling gawk for Cygwin:             Cygwin.              (line   6)
-* compiling gawk for MS-DOS and MS-Windows: PC Compiling.     (line  13)
+* compiling gawk for MS-DOS and MS-Windows: PC Compiling.     (line  12)
 * compiling gawk for VMS:                VMS Compilation.     (line   6)
-* compiling gawk with EMX for OS/2:      PC Compiling.        (line  28)
+* compiling gawk with EMX for OS/2:      PC Compiling.        (line  25)
 * compl:                                 Bitwise Functions.   (line  44)
 * complement, bitwise:                   Bitwise Functions.   (line  25)
 * compound statements, control statements and: Statements.    (line  10)
@@ -35800,80 +35803,81 @@ Node: Extension Sample API Tests1074128
 Node: gawkextlib1074620
 Node: Extension summary1077067
 Node: Extension Exercises1080769
-Node: Language History1082266
-Node: V7/SVR3.11083922
-Node: SVR41086074
-Node: POSIX1087508
-Node: BTL1088887
-Node: POSIX/GNU1089616
-Node: Feature History1095478
-Node: Common Extensions1109848
-Node: Ranges and Locales1111131
-Ref: Ranges and Locales-Footnote-11115747
-Ref: Ranges and Locales-Footnote-21115774
-Ref: Ranges and Locales-Footnote-31116009
-Node: Contributors1116230
-Node: History summary1121799
-Node: Installation1123179
-Node: Gawk Distribution1124123
-Node: Getting1124607
-Node: Extracting1125568
-Node: Distribution contents1127206
-Node: Unix Installation1133300
-Node: Quick Installation1133982
-Node: Shell Startup Files1136396
-Node: Additional Configuration Options1137474
-Node: Configuration Philosophy1139279
-Node: Non-Unix Installation1141648
-Node: PC Installation1142106
-Node: PC Binary Installation1143426
-Node: PC Compiling1145278
-Ref: PC Compiling-Footnote-11148302
-Node: PC Testing1148411
-Node: PC Using1149591
-Node: Cygwin1153705
-Node: MSYS1154475
-Node: VMS Installation1154976
-Node: VMS Compilation1155767
-Ref: VMS Compilation-Footnote-11156996
-Node: VMS Dynamic Extensions1157054
-Node: VMS Installation Details1158739
-Node: VMS Running1160992
-Node: VMS GNV1165271
-Node: VMS Old Gawk1166006
-Node: Bugs1166477
-Node: Other Versions1170674
-Node: Installation summary1177258
-Node: Notes1178316
-Node: Compatibility Mode1179181
-Node: Additions1179963
-Node: Accessing The Source1180888
-Node: Adding Code1182323
-Node: New Ports1188542
-Node: Derived Files1193030
-Ref: Derived Files-Footnote-11198515
-Ref: Derived Files-Footnote-21198550
-Ref: Derived Files-Footnote-31199148
-Node: Future Extensions1199262
-Node: Implementation Limitations1199920
-Node: Extension Design1201103
-Node: Old Extension Problems1202257
-Ref: Old Extension Problems-Footnote-11203775
-Node: Extension New Mechanism Goals1203832
-Ref: Extension New Mechanism Goals-Footnote-11207196
-Node: Extension Other Design Decisions1207385
-Node: Extension Future Growth1209498
-Node: Old Extension Mechanism1210334
-Node: Notes summary1212097
-Node: Basic Concepts1213279
-Node: Basic High Level1213960
-Ref: figure-general-flow1214242
-Ref: figure-process-flow1214927
-Ref: Basic High Level-Footnote-11218228
-Node: Basic Data Typing1218413
-Node: Glossary1221741
-Node: Copying1253687
-Node: GNU Free Documentation License1291226
-Node: Index1316344
+Node: Language History1082267
+Node: V7/SVR3.11083923
+Node: SVR41086075
+Node: POSIX1087509
+Node: BTL1088888
+Node: POSIX/GNU1089617
+Node: Feature History1095479
+Node: Common Extensions1109849
+Node: Ranges and Locales1111132
+Ref: Ranges and Locales-Footnote-11115748
+Ref: Ranges and Locales-Footnote-21115775
+Ref: Ranges and Locales-Footnote-31116010
+Node: Contributors1116231
+Node: History summary1121791
+Node: Installation1123171
+Node: Gawk Distribution1124115
+Node: Getting1124599
+Node: Extracting1125560
+Node: Distribution contents1127198
+Node: Unix Installation1133292
+Node: Quick Installation1133974
+Node: Shell Startup Files1136388
+Node: Additional Configuration Options1137466
+Node: Configuration Philosophy1139271
+Node: Non-Unix Installation1141640
+Node: PC Installation1142098
+Node: PC Binary Installation1143418
+Node: PC Compiling1145270
+Ref: PC Compiling-Footnote-11148064
+Node: PC Testing1148173
+Node: PC Using1149353
+Ref: PC Using-Footnote-11153506
+Node: Cygwin1153579
+Node: MSYS1154349
+Node: VMS Installation1154850
+Node: VMS Compilation1155641
+Ref: VMS Compilation-Footnote-11156870
+Node: VMS Dynamic Extensions1156928
+Node: VMS Installation Details1158613
+Node: VMS Running1160866
+Node: VMS GNV1165145
+Node: VMS Old Gawk1165880
+Node: Bugs1166351
+Node: Other Versions1170666
+Node: Installation summary1177250
+Node: Notes1178301
+Node: Compatibility Mode1179166
+Node: Additions1179948
+Node: Accessing The Source1180873
+Node: Adding Code1182308
+Node: New Ports1188527
+Node: Derived Files1193015
+Ref: Derived Files-Footnote-11198500
+Ref: Derived Files-Footnote-21198535
+Ref: Derived Files-Footnote-31199133
+Node: Future Extensions1199247
+Node: Implementation Limitations1199905
+Node: Extension Design1201088
+Node: Old Extension Problems1202242
+Ref: Old Extension Problems-Footnote-11203760
+Node: Extension New Mechanism Goals1203817
+Ref: Extension New Mechanism Goals-Footnote-11207181
+Node: Extension Other Design Decisions1207370
+Node: Extension Future Growth1209483
+Node: Old Extension Mechanism1210319
+Node: Notes summary1212082
+Node: Basic Concepts1213264
+Node: Basic High Level1213945
+Ref: figure-general-flow1214227
+Ref: figure-process-flow1214912
+Ref: Basic High Level-Footnote-11218213
+Node: Basic Data Typing1218398
+Node: Glossary1221726
+Node: Copying1253672
+Node: GNU Free Documentation License1291211
+Node: Index1316329
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index d2ed10f2..df4a1942 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -35972,7 +35972,7 @@ function to tell if the input file is a terminal. (Hint: this function
 is usually expensive to call; try to call it just once.)
 The content of the prompt should come from a variable settable
 by @command{awk}-level code.
-You can write the prompt to stanard error. However,
+You can write the prompt to standard error. However,
 for best results, open a new file descriptor (or file pointer)
 on @file{/dev/tty} and print the prompt there, in case standard
 error has been redirected.
@@ -37568,14 +37568,13 @@ provided the port to Amiga systems and its documentation.
 @item
 @cindex Deifik, Scott
 Scott Deifik
-currently maintains the MS-DOS port using DJGPP.
+maintained the MS-DOS port using DJGPP.
 
 @item
 @cindex Zaretskii, Eli
 Eli Zaretskii
 currently maintains the MS-Windows port using MinGW.
 
-
 @item
 @cindex Grigera, Juan
 Juan Grigera
@@ -38410,13 +38409,13 @@ or more detailed installation instructions.
 @appendixsubsubsec Compiling @command{gawk} for PC Operating Systems
 
 @ifclear FOR_PRINT
-@command{gawk} can be compiled for MS-DOS, Windows32, and OS/2 using the GNU
-development tools from DJ Delorie (DJGPP: MS-DOS only), MinGW (Windows32) or Eberhard
+@command{gawk} can be compiled for MS-DOS, Windows32, and OS/2 using
+MinGW (Windows32) or Eberhard
 Mattes (EMX: MS-DOS, Windows32 and OS/2).
 @end ifclear
 @ifset FOR_PRINT
-@command{gawk} can be compiled for MS-DOS and Windows32 using the GNU
-development tools from DJ Delorie (DJGPP: MS-DOS only) or MinGW (Windows32).
+@command{gawk} can be compiled for Windows32 using
+MinGW.
 @end ifset
 The file
 @file{README_d/README.pc} in the @command{gawk} distribution contains
@@ -38434,10 +38433,8 @@ to be edited in order to work with your @command{make} utility.
 
 The @file{Makefile} supports a number of targets for building various
 MS-DOS and Windows32 versions.  A list of targets is printed if the
-@command{make} command is given without a target.  As an example, to
-build @command{gawk} using the DJGPP tools, enter @samp{make djgpp}.
-(The DJGPP tools needed for the build may be found at
-@uref{ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/}.)  To build a
+@command{make} command is given without a target.  As an example,
+to build a
 native MS-Windows binary of @command{gawk} using the MinGW tools,
 type @samp{make mingw32}.
 
@@ -38586,13 +38583,16 @@ E.g., if @env{UNIXROOT} is set to @file{e:} the complete default search path is
 
 An @command{sh}-like shell (as opposed to @command{command.com} under MS-DOS
 or @command{cmd.exe} under MS-Windows or OS/2) may be useful for @command{awk} programming.
-The DJGPP collection of tools includes an MS-DOS port of Bash,
+The DJGPP collection of tools@footnote{Available from
+@uref{ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/}.}
+includes an MS-DOS port of Bash,
 and several shells are available for OS/2, including @command{ksh}.
 @end ifclear
 @ifset FOR_PRINT
 An @command{sh}-like shell (as opposed to @command{command.com} under MS-DOS
 or @command{cmd.exe} under MS-Windows) may be useful for @command{awk} programming.
-The DJGPP collection of tools includes an MS-DOS port of Bash.
+The DJGPP collection of tools@footnote{Available from
+@uref{ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/}.} includes an MS-DOS port of Bash.
 @end ifset
 
 @cindex common extensions, @code{BINMODE} variable
@@ -39219,7 +39219,7 @@ The people maintaining the various @command{gawk} ports are:
 @multitable {MS-Windows with MinGW} {123456789012345678901234567890123456789001234567890}
 @item Unix and POSIX systems @tab Arnold Robbins, @EMAIL{arnold@@skeeve.com,arnold at skeeve dot com}
 
-@item MS-DOS with DJGPP @tab Scott Deifik, @EMAIL{scottd.mail@@sbcglobal.net,scottd dot mail at sbcglobal dot net}
+@c @item MS-DOS with DJGPP @tab Scott Deifik, @EMAIL{scottd.mail@@sbcglobal.net,scottd dot mail at sbcglobal dot net}
 
 @item MS-Windows with MinGW @tab Eli Zaretskii, @EMAIL{eliz@@gnu.org,eliz at gnu dot org}
 
@@ -39236,6 +39236,10 @@ The people maintaining the various @command{gawk} ports are:
 If your bug is also reproducible under Unix, send a copy of your
 report to the @EMAIL{bug-gawk@@gnu.org,bug-gawk at gnu dot org} email list as well.
 
+The DJGPP port is no longer supported; it will remain in the code base for a while in case
+a volunteer wishes to take it over. If this does not happen, then eventually code for this
+port will be removed.
+
 @node Other Versions
 @appendixsec Other Freely Available @command{awk} Implementations
 @cindex @command{awk}, implementations
@@ -39478,7 +39482,8 @@ cd gawk-@value{VERSION}.@value{PATCHLEVEL}
 
 @item
 @command{gawk} may be built on non-POSIX systems as well. The currently
-supported systems are MS-Windows using DJGPP, MSYS, MinGW, and Cygwin,
+supported systems are MS-Windows using
+MSYS, MinGW, and Cygwin,
 @ifclear FOR_PRINT
 OS/2 using EMX,
 @end ifclear
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index cd59f968..2b0a5c26 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -35054,7 +35054,7 @@ function to tell if the input file is a terminal. (Hint: this function
 is usually expensive to call; try to call it just once.)
 The content of the prompt should come from a variable settable
 by @command{awk}-level code.
-You can write the prompt to stanard error. However,
+You can write the prompt to standard error. However,
 for best results, open a new file descriptor (or file pointer)
 on @file{/dev/tty} and print the prompt there, in case standard
 error has been redirected.
@@ -36650,14 +36650,13 @@ provided the port to Amiga systems and its documentation.
 @item
 @cindex Deifik, Scott
 Scott Deifik
-currently maintains the MS-DOS port using DJGPP.
+maintained the MS-DOS port using DJGPP.
 
 @item
 @cindex Zaretskii, Eli
 Eli Zaretskii
 currently maintains the MS-Windows port using MinGW.
 
-
 @item
 @cindex Grigera, Juan
 Juan Grigera
@@ -37492,13 +37491,13 @@ or more detailed installation instructions.
 @appendixsubsubsec Compiling @command{gawk} for PC Operating Systems
 
 @ifclear FOR_PRINT
-@command{gawk} can be compiled for MS-DOS, Windows32, and OS/2 using the GNU
-development tools from DJ Delorie (DJGPP: MS-DOS only), MinGW (Windows32) or Eberhard
+@command{gawk} can be compiled for MS-DOS, Windows32, and OS/2 using
+MinGW (Windows32) or Eberhard
 Mattes (EMX: MS-DOS, Windows32 and OS/2).
 @end ifclear
 @ifset FOR_PRINT
-@command{gawk} can be compiled for MS-DOS and Windows32 using the GNU
-development tools from DJ Delorie (DJGPP: MS-DOS only) or MinGW (Windows32).
+@command{gawk} can be compiled for Windows32 using
+MinGW.
 @end ifset
 The file
 @file{README_d/README.pc} in the @command{gawk} distribution contains
@@ -37516,10 +37515,8 @@ to be edited in order to work with your @command{make} utility.
 
 The @file{Makefile} supports a number of targets for building various
 MS-DOS and Windows32 versions.  A list of targets is printed if the
-@command{make} command is given without a target.  As an example, to
-build @command{gawk} using the DJGPP tools, enter @samp{make djgpp}.
-(The DJGPP tools needed for the build may be found at
-@uref{ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/}.)  To build a
+@command{make} command is given without a target.  As an example,
+to build a
 native MS-Windows binary of @command{gawk} using the MinGW tools,
 type @samp{make mingw32}.
 
@@ -37668,13 +37665,16 @@ E.g., if @env{UNIXROOT} is set to @file{e:} the complete default search path is
 
 An @command{sh}-like shell (as opposed to @command{command.com} under MS-DOS
 or @command{cmd.exe} under MS-Windows or OS/2) may be useful for @command{awk} programming.
-The DJGPP collection of tools includes an MS-DOS port of Bash,
+The DJGPP collection of tools@footnote{Available from
+@uref{ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/}.}
+includes an MS-DOS port of Bash,
 and several shells are available for OS/2, including @command{ksh}.
 @end ifclear
 @ifset FOR_PRINT
 An @command{sh}-like shell (as opposed to @command{command.com} under MS-DOS
 or @command{cmd.exe} under MS-Windows) may be useful for @command{awk} programming.
-The DJGPP collection of tools includes an MS-DOS port of Bash.
+The DJGPP collection of tools@footnote{Available from
+@uref{ftp://ftp.delorie.com/pub/djgpp/current/v2gnu/}.} includes an MS-DOS port of Bash.
 @end ifset
 
 @cindex common extensions, @code{BINMODE} variable
@@ -38301,7 +38301,7 @@ The people maintaining the various @command{gawk} ports are:
 @multitable {MS-Windows with MinGW} {123456789012345678901234567890123456789001234567890}
 @item Unix and POSIX systems @tab Arnold Robbins, @EMAIL{arnold@@skeeve.com,arnold at skeeve dot com}
 
-@item MS-DOS with DJGPP @tab Scott Deifik, @EMAIL{scottd.mail@@sbcglobal.net,scottd dot mail at sbcglobal dot net}
+@c @item MS-DOS with DJGPP @tab Scott Deifik, @EMAIL{scottd.mail@@sbcglobal.net,scottd dot mail at sbcglobal dot net}
 
 @item MS-Windows with MinGW @tab Eli Zaretskii, @EMAIL{eliz@@gnu.org,eliz at gnu dot org}
 
@@ -38318,6 +38318,10 @@ The people maintaining the various @command{gawk} ports are:
 If your bug is also reproducible under Unix, send a copy of your
 report to the @EMAIL{bug-gawk@@gnu.org,bug-gawk at gnu dot org} email list as well.
 
+The DJGPP port is no longer supported; it will remain in the code base for a while in case
+a volunteer wishes to take it over. If this does not happen, then eventually code for this
+port will be removed.
+
 @node Other Versions
 @appendixsec Other Freely Available @command{awk} Implementations
 @cindex @command{awk}, implementations
@@ -38560,7 +38564,8 @@ cd gawk-@value{VERSION}.@value{PATCHLEVEL}
 
 @item
 @command{gawk} may be built on non-POSIX systems as well. The currently
-supported systems are MS-Windows using DJGPP, MSYS, MinGW, and Cygwin,
+supported systems are MS-Windows using
+MSYS, MinGW, and Cygwin,
 @ifclear FOR_PRINT
 OS/2 using EMX,
 @end ifclear
diff --git a/eval.c b/eval.c
index e5c0861a..6bd854e9 100644
--- a/eval.c
+++ b/eval.c
@@ -219,6 +219,8 @@ load_casetable(void)
 	for (i = 0200; i <= 0377; i++) {
 		if (isalpha(i) && islower(i) && i != toupper(i))
 			casetable[i] = toupper(i);
+		else
+			casetable[i] = i;
 	}
 #endif
 #endif
diff --git a/mpfr.c b/mpfr.c
index 0bb5b435..673553df 100644
--- a/mpfr.c
+++ b/mpfr.c
@@ -39,6 +39,8 @@ mpz_t MFNR;
 bool do_ieee_fmt;	/* IEEE-754 floating-point emulation */
 mpfr_rnd_t ROUND_MODE;
 
+static mpfr_prec_t default_prec;
+
 static mpfr_rnd_t get_rnd_mode(const char rmode);
 static NODE *mpg_force_number(NODE *n);
 static NODE *mpg_make_number(double);
@@ -70,7 +72,7 @@ static inline mpfr_ptr mpg_tofloat(mpfr_ptr mf, mpz_ptr mz);
 void
 init_mpfr(mpfr_prec_t prec, const char *rmode)
 {
-	mpfr_set_default_prec(prec);
+	mpfr_set_default_prec(default_prec = prec);
 	ROUND_MODE = get_rnd_mode(rmode[0]);
 	mpfr_set_default_rounding_mode(ROUND_MODE);
 	make_number = mpg_make_number;
@@ -556,7 +558,7 @@ set_PREC()
 	}
 
 	if (prec > 0)
-		mpfr_set_default_prec(prec);
+		mpfr_set_default_prec(default_prec = prec);
 }
 
 
@@ -700,6 +702,7 @@ do_mpfr_func(const char *name,
 	NODE *t1, *res;
 	mpfr_ptr p1;
 	int tval;
+	mpfr_prec_t argprec;
 
 	t1 = POP_SCALAR();
 	if (do_lint && (fixtype(t1)->flags & NUMBER) == 0)
@@ -708,7 +711,8 @@ do_mpfr_func(const char *name,
 	force_number(t1);
 	p1 = MP_FLOAT(t1);
 	res = mpg_float();
-	mpfr_set_prec(res->mpg_numbr, mpfr_get_prec(p1));	/* needed at least for sqrt() */
+	if ((argprec = mpfr_get_prec(p1)) > default_prec)
+		mpfr_set_prec(res->mpg_numbr, argprec);	/* needed at least for sqrt() */
 	tval = mpfr_func(res->mpg_numbr, p1, ROUND_MODE);
 	IEEE_FMT(res->mpg_numbr, tval);
 	DEREF(t1);
@@ -1295,9 +1299,17 @@ mpg_tofloat(mpfr_ptr mf, mpz_ptr mz)
 		prec -= (size_t) mpz_scan1(mz, 0);	/* least significant 1 bit index starting at 0 */
 		if (prec > MPFR_PREC_MAX)
 			prec = MPFR_PREC_MAX;
-		if (prec > PRECISION_MIN) 
-			mpfr_set_prec(mf, prec);
+		else if (prec < PRECISION_MIN)
+			prec = PRECISION_MIN;
 	}
+	else
+		prec = PRECISION_MIN;
+	/*
+	 * Always set the precision to avoid hysteresis, since do_mpfr_func 
+	 * may copy our precision.
+	 */
+	if (prec != mpfr_get_prec(mf))
+		mpfr_set_prec(mf, prec);
 
 	mpfr_set_z(mf, mz, ROUND_MODE);
 	return mf;
diff --git a/re.c b/re.c
index 67ff682f..d92560d0 100644
--- a/re.c
+++ b/re.c
@@ -266,17 +266,17 @@ research(Regexp *rp, char *str, int start,
 		rp->pat.not_bol = 1;
 
 	/*
-	 * Always do dfa search if can; if it fails, then even if
-	 * need_start is true, we won't bother with the regex search.
+	 * Always do dfa search if can; if it fails, we won't bother
+	 * with the regex search.
 	 *
 	 * The dfa matcher doesn't have a no_bol flag, so don't bother
 	 * trying it in that case.
 	 *
-	 * 7/2008: Skip the dfa matcher if need_start. The dfa matcher
-	 * has bugs in certain multibyte cases and it's too difficult
-	 * to try to special case things.
+	 * 7/2016: The dfa matcher can't handle a case where searching
+	 * starts in the middle of a string, so don't bother trying it
+	 * in that case.
 	 */
-	if (rp->dfa && ! no_bol && ! need_start) {
+	if (rp->dfa && ! no_bol && start == 0) {
 		char save;
 		size_t count = 0;
 		struct dfa *superset = dfasuperset(rp->dfareg);
diff --git a/test/ChangeLog b/test/ChangeLog
index f159be72..36fece67 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,19 @@
+2016-08-01         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* Makefile.am (sortfor2): New test.
+	* sortfor2.awk, sortfor2.in, sortfor2.ok: New files.
+	Thanks Christian Schneider <software@chschneider.eu>
+	for the report.
+
+	Unrelated:
+
+	* Makefile.am (ignrcas3): New test.
+	* ignrcas3.awk, ignrcas3.ok: New files.
+	Based on test code from Norihiro Tanaka <noritnk@kcn.ne.jp>.
+
+	* Makefile.am (ignrcas4): New test.
+	* ignrcas4.awk, ignrcas4.ok: Andrew Schorr's files, renamed.
+
 2016-07-23         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* Makefile.am (status-close): New test.
@@ -6,7 +22,7 @@
 2015-06-17         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* Makefile.am (ofmtstrnum): New test.
-	* ofmtstrnu.awk, ofmtstrnum.ok: New files.
+	* ofmtstrnum.awk, ofmtstrnum.ok: New files.
 
 2016-07-20         Arnold D. Robbins     <arnold@skeeve.com>
 
diff --git a/test/Makefile.am b/test/Makefile.am
index 40636acd..327d25b9 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -467,6 +467,8 @@ EXTRA_DIST = \
 	ignrcas2.ok \
 	ignrcas3.awk \
 	ignrcas3.ok \
+	ignrcas4.awk \
+	ignrcas4.ok \
 	ignrcase.awk \
 	ignrcase.in \
 	ignrcase.ok \
@@ -970,6 +972,9 @@ EXTRA_DIST = \
 	sortfor.awk \
 	sortfor.in \
 	sortfor.ok \
+	sortfor2.awk \
+	sortfor2.in \
+	sortfor2.ok \
 	sortglos.awk \
 	sortglos.in \
 	sortglos.ok \
@@ -1194,7 +1199,7 @@ GAWK_EXT_TESTS = \
 	fieldwdth forcenum fpat1 fpat2 fpat3 fpat4 fpat5 fpatnull fsfwfs funlen \
 	functab1 functab2 functab3 fwtest fwtest2 fwtest3 \
 	genpot gensub gensub2 getlndir gnuops2 gnuops3 gnureops gsubind \
-	icasefs icasers id igncdym igncfs ignrcas2 ignrcas3 ignrcase \
+	icasefs icasers id igncdym igncfs ignrcas2 ignrcas3 ignrcas4 ignrcase \
 	incdupe incdupe2 incdupe3 incdupe4 incdupe5 incdupe6 incdupe7 \
 	include include2 indirectbuiltin indirectcall indirectcall2 intarray \
 	lint lintexp lintindex lintint lintlength lintold lintset lintwarn \
@@ -1207,7 +1212,7 @@ GAWK_EXT_TESTS = \
 	profile8 profile9 profile10 pty1 \
 	rebuf regnul1 regnul2 regx8bit reginttrad reint reint2 rsgetline rsglstdin rsstart1 \
 	rsstart2 rsstart3 rstest6 shadow shadowbuiltin \
-	sortfor sortu split_after_fpat \
+	sortfor sortfor2 sortu split_after_fpat \
 	splitarg4 strftime \
 	strtonum strtonum1 switch2 symtab1 symtab2 symtab3 symtab4 symtab5 symtab6 \
 	symtab7 symtab8 symtab9 symtab10 \
@@ -2321,6 +2326,12 @@ symtab10:
 	@AWKPATH="$(srcdir)" $(AWK) -D -f $@.awk < "$(srcdir)/$@.in" >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+ignrcas3::
+	@echo $@
+	@GAWKLOCALE=el_GR.iso88597 \
+	AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
 # Targets generated for other tests:
 include Maketests
 
diff --git a/test/Makefile.in b/test/Makefile.in
index beb2af2d..dc23e9b9 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -724,6 +724,8 @@ EXTRA_DIST = \
 	ignrcas2.ok \
 	ignrcas3.awk \
 	ignrcas3.ok \
+	ignrcas4.awk \
+	ignrcas4.ok \
 	ignrcase.awk \
 	ignrcase.in \
 	ignrcase.ok \
@@ -1227,6 +1229,9 @@ EXTRA_DIST = \
 	sortfor.awk \
 	sortfor.in \
 	sortfor.ok \
+	sortfor2.awk \
+	sortfor2.in \
+	sortfor2.ok \
 	sortglos.awk \
 	sortglos.in \
 	sortglos.ok \
@@ -1450,7 +1455,7 @@ GAWK_EXT_TESTS = \
 	fieldwdth forcenum fpat1 fpat2 fpat3 fpat4 fpat5 fpatnull fsfwfs funlen \
 	functab1 functab2 functab3 fwtest fwtest2 fwtest3 \
 	genpot gensub gensub2 getlndir gnuops2 gnuops3 gnureops gsubind \
-	icasefs icasers id igncdym igncfs ignrcas2 ignrcas3 ignrcase \
+	icasefs icasers id igncdym igncfs ignrcas2 ignrcas3 ignrcas4 ignrcase \
 	incdupe incdupe2 incdupe3 incdupe4 incdupe5 incdupe6 incdupe7 \
 	include include2 indirectbuiltin indirectcall indirectcall2 intarray \
 	lint lintexp lintindex lintint lintlength lintold lintset lintwarn \
@@ -1463,7 +1468,7 @@ GAWK_EXT_TESTS = \
 	profile8 profile9 profile10 pty1 \
 	rebuf regnul1 regnul2 regx8bit reginttrad reint reint2 rsgetline rsglstdin rsstart1 \
 	rsstart2 rsstart3 rstest6 shadow shadowbuiltin \
-	sortfor sortu split_after_fpat \
+	sortfor sortfor2 sortu split_after_fpat \
 	splitarg4 strftime \
 	strtonum strtonum1 switch2 symtab1 symtab2 symtab3 symtab4 symtab5 symtab6 \
 	symtab7 symtab8 symtab9 symtab10 \
@@ -2758,6 +2763,12 @@ symtab10:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -D -f $@.awk < "$(srcdir)/$@.in" >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
+ignrcas3::
+	@echo $@
+	@GAWKLOCALE=el_GR.iso88597 \
+	AWKPATH="$(srcdir)" $(AWK) -f $@.awk >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 Gt-dummy:
 # file Maketests, generated from Makefile.am by the Gentests program
 addcomma:
@@ -3982,7 +3993,7 @@ igncfs:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
-ignrcas3:
+ignrcas4:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
@@ -4162,6 +4173,11 @@ sortfor:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+sortfor2:
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
 sortu:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/Maketests b/test/Maketests
index d9b4fe09..951590ac 100644
--- a/test/Maketests
+++ b/test/Maketests
@@ -1222,7 +1222,7 @@ igncfs:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
-ignrcas3:
+ignrcas4:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
@@ -1402,6 +1402,11 @@ sortfor:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+sortfor2:
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  < "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
 sortu:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/ignrcas3.awk b/test/ignrcas3.awk
index e74eea64..fd88744d 100644
--- a/test/ignrcas3.awk
+++ b/test/ignrcas3.awk
@@ -1,7 +1,20 @@
 BEGIN {
-	x = "0"
-	print x+0	# trigger NUMCUR
-	IGNORECASE = x	# should enable ignorecase, since x is a non-null string
-	y = "aBc"
-	print (y ~ /abc/)
+	dfapat[1] = data[1] = "b\323"
+	dfapat[2] = data[2] = "b\362"
+	dfapat[3] = data[3] = "b\363"
+
+	regexpat[1] = "[a-c]\323"
+	regexpat[2] = "[a-c]\362"
+	regexpat[3] = "[a-c]\363"
+
+	IGNORECASE = 1
+
+	for (i = 1; i <= 3; i++) {
+		for (j = 1; j <= 3; j++) {
+			printf("data[%d] ~ dfa[%d] = %s\n", i, j,
+				data[i] ~ dfapat[j] ? "ok" : "bad")
+			printf("data[%d] ~ regex[%d] = %s\n", i, j,
+				data[i] ~ regexpat[j] ? "ok" : "bad")
+		}
+	}
 }
diff --git a/test/ignrcas3.ok b/test/ignrcas3.ok
index 0d66ea1a..0222feb5 100644
--- a/test/ignrcas3.ok
+++ b/test/ignrcas3.ok
@@ -1,2 +1,18 @@
-0
-1
+data[1] ~ dfa[1] = ok
+data[1] ~ regex[1] = ok
+data[1] ~ dfa[2] = ok
+data[1] ~ regex[2] = ok
+data[1] ~ dfa[3] = ok
+data[1] ~ regex[3] = ok
+data[2] ~ dfa[1] = ok
+data[2] ~ regex[1] = ok
+data[2] ~ dfa[2] = ok
+data[2] ~ regex[2] = ok
+data[2] ~ dfa[3] = ok
+data[2] ~ regex[3] = ok
+data[3] ~ dfa[1] = ok
+data[3] ~ regex[1] = ok
+data[3] ~ dfa[2] = ok
+data[3] ~ regex[2] = ok
+data[3] ~ dfa[3] = ok
+data[3] ~ regex[3] = ok
diff --git a/test/ignrcas4.awk b/test/ignrcas4.awk
new file mode 100644
index 00000000..e74eea64
--- /dev/null
+++ b/test/ignrcas4.awk
@@ -0,0 +1,7 @@
+BEGIN {
+	x = "0"
+	print x+0	# trigger NUMCUR
+	IGNORECASE = x	# should enable ignorecase, since x is a non-null string
+	y = "aBc"
+	print (y ~ /abc/)
+}
diff --git a/test/ignrcas4.ok b/test/ignrcas4.ok
new file mode 100644
index 00000000..0d66ea1a
--- /dev/null
+++ b/test/ignrcas4.ok
@@ -0,0 +1,2 @@
+0
+1
diff --git a/test/sortfor2.awk b/test/sortfor2.awk
new file mode 100644
index 00000000..1dfca04f
--- /dev/null
+++ b/test/sortfor2.awk
@@ -0,0 +1,11 @@
+BEGIN {
+    PROCINFO["sorted_in"] = "@ind_num_asc"
+  }
+  {
+    A[$1] = 0
+  }
+  END {
+    for (I in A) B[I] = A[I]
+    for (I in B) SCRATCH = A[I]
+    for (I in A) print I
+  }
diff --git a/test/sortfor2.in b/test/sortfor2.in
new file mode 100644
index 00000000..e75357a1
--- /dev/null
+++ b/test/sortfor2.in
@@ -0,0 +1,2 @@
+1.0
+2.0
diff --git a/test/sortfor2.ok b/test/sortfor2.ok
new file mode 100644
index 00000000..e75357a1
--- /dev/null
+++ b/test/sortfor2.ok
@@ -0,0 +1,2 @@
+1.0
+2.0