Further api doc updates. Simplify lint checking for max args.

7 files changed, 790 insertions, 693 deletions

diff --git a/ChangeLog b/ChangeLog
index 436bf592..dfedd36b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2016-12-17         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawkapi.h (api_add_ext_func): Add comment about point to
+	awk_ext_func_t not being const but gawk doesn't use it.
+	* * interpret.h (Op_ext_builtin): Simplify code, check only
+	if do_lint and ! f->suppress_lint and num_args > max_expected.
+
 2016-12-16         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawkapi.h (awk_ext_func_t): Put max back before min. Restores
diff --git a/doc/ChangeLog b/doc/ChangeLog
index f68e4ce0..c9c618d2 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2016-12-17         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in: Further API clarifications and edits, add a
+	section on backwards compatibility.
+
 2016-12-16         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in: Update description of awk_ext_func_t structure,
diff --git a/doc/gawk.info b/doc/gawk.info
index 2269c821..9033acab 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -569,6 +569,7 @@ in (a) below.  A copy of the license is included in the section entitled
 * Extension API Informational Variables:: Variables providing information about
                                         'gawk''s invocation.
 * Extension API Boilerplate::           Boilerplate code for using the API.
+* Changes from API V1::                 Changes from V1 of the API.
 * Finding Extensions::                  How 'gawk' finds compiled
                                         extensions.
 * Extension Example::                   Example C code for an extension.
@@ -23439,6 +23440,7 @@ API in detail.
                                          redirections.
 * Extension API Variables::              Variables provided by the API.
 * Extension API Boilerplate::            Boilerplate code for using the API.
+* Changes from API V1::                  Changes from V1 of the API.
 
 
 File: gawk.info,  Node: Extension API Functions Introduction,  Next: General Data Types,  Up: Extension API Description
@@ -23879,7 +23881,9 @@ Extension functions are described by the following record:
      which may be followed by any number of letters, digits, and
      underscores.  Letter case in function names is significant.
 
-'awk_value_t *(*const function)(int num_actual_args, awk_value_t *result, struct awk_ext_func *finfo);'
+'awk_value_t *(*const function)(int num_actual_args,'
+'                              awk_value_t *result,'
+'                              struct awk_ext_func *finfo);'
      This is a pointer to the C function that provides the extension's
      functionality.  The function must fill in '*result' with either a
      number or a string.  'gawk' takes ownership of any string memory.
@@ -23920,19 +23924,46 @@ Extension functions are described by the following record:
 'void *data;'
      This is an opaque pointer to any data that an extension function
      may wish to have available when called.  Passing the
-     'awk_ext_funct_t' structure to the extension function, and having
-     this pointer available in it enables writing a single C or C++
+     'awk_ext_func_t' structure to the extension function, and having
+     this pointer available in it enable writing a single C or C++
      function that implements multiple 'awk'-level extension functions.
 
    Once you have a record representing your extension function, you
 register it with 'gawk' using this API function:
 
-'awk_bool_t add_ext_func(const char *namespace, const awk_ext_func_t *func);'
+'awk_bool_t add_ext_func(const char *namespace, awk_ext_func_t *func);'
      This function returns true upon success, false otherwise.  The
      'namespace' parameter is currently not used; you should pass in an
      empty string ('""').  The 'func' pointer is the address of a
      'struct' representing your function, as just described.
 
+     'gawk' does not modify what 'func' points to, but the extension
+     function itself receives this pointer and can modify what it points
+     to, thus it is purposely not declared to be 'const'.
+
+   The combination of 'min_required_args', 'max_expected_args', and
+'suppress_lint' may be confusing.  Here is how you should set things up.
+
+Any number of arguments is valid
+     Set 'min_required_args' and 'max_expected_args' to zero and set
+     'suppress_lint' to 'awk_true'.
+
+A minimum number of arguments is required, no limit on maximum number of arguments
+     Set 'min_required_args' to the minimum required.  Set
+     'max_expected_args' to zero and set 'suppress_lint' to 'awk_true'.
+
+A minium number of arguments is required, a maximum number is expected
+     Set 'min_required_args' to the minimum required.  Set
+     'max_expected_args' to the maximum expected.  Set 'suppress_lint'
+     to 'awk_false'.
+
+A minum number of arguments is required, and no more than a maximum is allowed
+     Set 'min_required_args' to the minimum required.  Set
+     'max_expected_args' to the maximum expected.  Set 'suppress_lint'
+     to 'awk_false'.  In your extension function, check that
+     'num_actual_args' does not exceed 'f->max_expected_args'.  If it
+     does, issue a fatal error message.
+
 
 File: gawk.info,  Node: Exit Callback Functions,  Next: Extension Version String,  Prev: Extension Functions,  Up: Registration Functions
 
@@ -24526,11 +24557,6 @@ termed a "symbol table".  The functions are as follows:
 However, with the exception of the 'PROCINFO' array, an extension cannot
 change any of those variables.
 
-     CAUTION: It is possible for the lookup of 'PROCINFO' to fail.  This
-     happens if the 'awk' program being run does not reference
-     'PROCINFO'; in this case, 'gawk' doesn't bother to create the array
-     and populate it.
-
 
 File: gawk.info,  Node: Symbol table by cookie,  Next: Cached values,  Prev: Symbol table by name,  Up: Symbol Table Access
 
@@ -25322,10 +25348,10 @@ versions are available at compile time as C preprocessor defines to
 support conditional compilation, and as enum constants to facilitate
 debugging:
 
-API Version              C preprocessor define    enum constant
----------------------------------------------------------------------------
-Major                    gawk_api_major_version   GAWK_API_MAJOR_VERSION
-Minor                    gawk_api_minor_version   GAWK_API_MINOR_VERSION
+API Version   C preprocessor define      enum constant
+--------------------------------------------------------------------
+Major         'gawk_api_major_version'   'GAWK_API_MAJOR_VERSION'
+Minor         'gawk_api_minor_version'   'GAWK_API_MINOR_VERSION'
 
 Table 16.2: gawk API version constants
 
@@ -25342,10 +25368,10 @@ For this reason, the major and minor API versions of the running 'gawk'
 are included in the API 'struct' as read-only constant integers:
 
 'api->major_version'
-     The major version of the running 'gawk'
+     The major version of the running 'gawk'.
 
 'api->minor_version'
-     The minor version of the running 'gawk'
+     The minor version of the running 'gawk'.
 
    It is up to the extension to decide if there are API
 incompatibilities.  Typically, a check like this is enough:
@@ -25399,7 +25425,7 @@ predefined variable (*note Built-in Variables::).  The others should not
 change during execution.
 
 
-File: gawk.info,  Node: Extension API Boilerplate,  Prev: Extension API Variables,  Up: Extension API Description
+File: gawk.info,  Node: Extension API Boilerplate,  Next: Changes from API V1,  Prev: Extension API Variables,  Up: Extension API Description
 
 16.4.14 Boilerplate Code
 ------------------------
@@ -25419,7 +25445,7 @@ the 'gawkapi.h' header file:
      static const char *ext_version = NULL; /* or ... = "some string" */
 
      static awk_ext_func_t func_table[] = {
-         { "name", do_name, 1 },
+         { "name", do_name, 1, 0, awk_false, NULL },
          /* ... */
      };
 
@@ -25500,6 +25526,22 @@ does the following:
      'gawk'.
 
 
+File: gawk.info,  Node: Changes from API V1,  Prev: Extension API Boilerplate,  Up: Extension API Description
+
+16.4.15 Changes From Version 1 of the API
+-----------------------------------------
+
+The current API is _not_ binary compatible with version 1 of the API.
+You will have to recompile your extensions in order to use them with the
+current version of 'gawk'.
+
+   Fortunately, at the possible expense of some compile-time warnings,
+the API remains source-code-compatible with the previous API. The major
+differences are the additional members in the 'awk_ext_func_t'
+structure, and the addition of the third argument to the C
+implementation function.
+
+
 File: gawk.info,  Node: Finding Extensions,  Next: Extension Example,  Prev: Extension API Description,  Up: Dynamic Extensions
 
 16.5 How 'gawk' Finds Extensions
@@ -25716,24 +25758,20 @@ is a pointer to an 'awk_value_t' structure, usually named 'result':
      /*  do_chdir --- provide dynamically loaded chdir() function for gawk */
 
      static awk_value_t *
-     do_chdir(int nargs, awk_value_t *result)
+     do_chdir(int nargs, awk_value_t *result, struct awk_ext_func *unused)
      {
          awk_value_t newdir;
          int ret = -1;
 
          assert(result != NULL);
 
-         if (do_lint && nargs != 1)
-             lintwarn(ext_id,
-                      _("chdir: called with incorrect number of arguments, "
-                        "expecting 1"));
-
    The 'newdir' variable represents the new directory to change to,
 which is retrieved with 'get_argument()'.  Note that the first argument
 is numbered zero.
 
    If the argument is retrieved successfully, the function calls the
-'chdir()' system call.  If the 'chdir()' fails, 'ERRNO' is updated:
+'chdir()' system call.  Otherwise, if the 'chdir()' fails, it updates
+'ERRNO':
 
          if (get_argument(0, AWK_STRING, & newdir)) {
              ret = chdir(newdir.str_value.str);
@@ -25920,7 +25958,7 @@ declarations and argument checking:
      /* do_stat --- provide a stat() function for gawk */
 
      static awk_value_t *
-     do_stat(int nargs, awk_value_t *result)
+     do_stat(int nargs, awk_value_t *result, struct awk_ext_func *unused)
      {
          awk_value_t file_param, array_param;
          char *name;
@@ -25932,13 +25970,6 @@ declarations and argument checking:
 
          assert(result != NULL);
 
-         if (nargs != 2 && nargs != 3) {
-             if (do_lint)
-                 lintwarn(ext_id,
-                    _("stat: called with wrong number of arguments"));
-             return make_number(-1, result);
-         }
-
    Then comes the actual work.  First, the function gets the arguments.
 Next, it gets the information for the file.  If the called function
 ('lstat()' or 'stat()') returns an error, the code sets 'ERRNO' and
@@ -25995,11 +26026,9 @@ there is an initialization function:
 for loading each function into 'gawk':
 
      static awk_ext_func_t func_table[] = {
-         { "chdir", do_chdir, 1 },
-         { "stat",  do_stat, 2 },
-     #ifndef __MINGW32__
-         { "fts",   do_fts, 3 },
-     #endif
+         { "chdir", do_chdir, 1, 1, awk_false, NULL },
+         { "stat",  do_stat, 3, 2, awk_false, NULL },
+         ...
      };
 
    Each extension must have a routine named 'dl_load()' to load
@@ -35345,573 +35374,574 @@ Index
 
 Tag Table:
 Node: Top1200
-Node: Foreword342726
-Node: Foreword447168
-Node: Preface48700
-Ref: Preface-Footnote-151559
-Ref: Preface-Footnote-251666
-Ref: Preface-Footnote-351900
-Node: History52042
-Node: Names54394
-Ref: Names-Footnote-155488
-Node: This Manual55635
-Ref: This Manual-Footnote-162120
-Node: Conventions62220
-Node: Manual History64574
-Ref: Manual History-Footnote-167569
-Ref: Manual History-Footnote-267610
-Node: How To Contribute67684
-Node: Acknowledgments68813
-Node: Getting Started73699
-Node: Running gawk76138
-Node: One-shot77328
-Node: Read Terminal78591
-Node: Long80584
-Node: Executable Scripts82097
-Ref: Executable Scripts-Footnote-184892
-Node: Comments84995
-Node: Quoting87479
-Node: DOS Quoting92996
-Node: Sample Data Files93671
-Node: Very Simple96266
-Node: Two Rules101168
-Node: More Complex103053
-Node: Statements/Lines105919
-Ref: Statements/Lines-Footnote-1110378
-Node: Other Features110643
-Node: When111579
-Ref: When-Footnote-1113333
-Node: Intro Summary113398
-Node: Invoking Gawk114282
-Node: Command Line115796
-Node: Options116594
-Ref: Options-Footnote-1132693
-Ref: Options-Footnote-2132923
-Node: Other Arguments132948
-Node: Naming Standard Input135895
-Node: Environment Variables136988
-Node: AWKPATH Variable137546
-Ref: AWKPATH Variable-Footnote-1140957
-Ref: AWKPATH Variable-Footnote-2140991
-Node: AWKLIBPATH Variable141252
-Node: Other Environment Variables142509
-Node: Exit Status146330
-Node: Include Files147007
-Node: Loading Shared Libraries150602
-Node: Obsolete152030
-Node: Undocumented152722
-Node: Invoking Summary153019
-Node: Regexp154679
-Node: Regexp Usage156133
-Node: Escape Sequences158170
-Node: Regexp Operators164402
-Ref: Regexp Operators-Footnote-1171818
-Ref: Regexp Operators-Footnote-2171965
-Node: Bracket Expressions172063
-Ref: table-char-classes174539
-Node: Leftmost Longest177676
-Node: Computed Regexps178979
-Node: GNU Regexp Operators182406
-Node: Case-sensitivity186085
-Ref: Case-sensitivity-Footnote-1188972
-Ref: Case-sensitivity-Footnote-2189207
-Node: Regexp Summary189315
-Node: Reading Files190781
-Node: Records192944
-Node: awk split records193677
-Node: gawk split records198608
-Ref: gawk split records-Footnote-1203148
-Node: Fields203185
-Node: Nonconstant Fields205926
-Ref: Nonconstant Fields-Footnote-1208162
-Node: Changing Fields208366
-Node: Field Separators214294
-Node: Default Field Splitting216992
-Node: Regexp Field Splitting218110
-Node: Single Character Fields221463
-Node: Command Line Field Separator222523
-Node: Full Line Fields225741
-Ref: Full Line Fields-Footnote-1227263
-Ref: Full Line Fields-Footnote-2227309
-Node: Field Splitting Summary227410
-Node: Constant Size229484
-Node: Splitting By Content234062
-Ref: Splitting By Content-Footnote-1238033
-Node: Multiple Line238196
-Ref: Multiple Line-Footnote-1244078
-Node: Getline244257
-Node: Plain Getline246724
-Node: Getline/Variable249363
-Node: Getline/File250512
-Node: Getline/Variable/File251898
-Ref: Getline/Variable/File-Footnote-1253501
-Node: Getline/Pipe253589
-Node: Getline/Variable/Pipe256294
-Node: Getline/Coprocess257427
-Node: Getline/Variable/Coprocess258692
-Node: Getline Notes259432
-Node: Getline Summary262227
-Ref: table-getline-variants262649
-Node: Read Timeout263397
-Ref: Read Timeout-Footnote-1267303
-Node: Retrying Input267361
-Node: Command-line directories268560
-Node: Input Summary269466
-Node: Input Exercises272638
-Node: Printing273366
-Node: Print275200
-Node: Print Examples276657
-Node: Output Separators279437
-Node: OFMT281454
-Node: Printf282810
-Node: Basic Printf283595
-Node: Control Letters285169
-Node: Format Modifiers289157
-Node: Printf Examples295172
-Node: Redirection297658
-Node: Special FD304499
-Ref: Special FD-Footnote-1307667
-Node: Special Files307741
-Node: Other Inherited Files308358
-Node: Special Network309359
-Node: Special Caveats310219
-Node: Close Files And Pipes311168
-Ref: table-close-pipe-return-values318075
-Ref: Close Files And Pipes-Footnote-1318858
-Ref: Close Files And Pipes-Footnote-2319006
-Node: Nonfatal319158
-Node: Output Summary321483
-Node: Output Exercises322705
-Node: Expressions323384
-Node: Values324572
-Node: Constants325250
-Node: Scalar Constants325941
-Ref: Scalar Constants-Footnote-1326805
-Node: Nondecimal-numbers327055
-Node: Regexp Constants330056
-Node: Using Constant Regexps330582
-Node: Standard Regexp Constants331204
-Node: Strong Regexp Constants334392
-Node: Variables337350
-Node: Using Variables338007
-Node: Assignment Options339917
-Node: Conversion341790
-Node: Strings And Numbers342314
-Ref: Strings And Numbers-Footnote-1345377
-Node: Locale influences conversions345486
-Ref: table-locale-affects348244
-Node: All Operators348862
-Node: Arithmetic Ops349491
-Node: Concatenation351997
-Ref: Concatenation-Footnote-1354844
-Node: Assignment Ops354951
-Ref: table-assign-ops359942
-Node: Increment Ops361255
-Node: Truth Values and Conditions364715
-Node: Truth Values365789
-Node: Typing and Comparison366837
-Node: Variable Typing367657
-Ref: Variable Typing-Footnote-1374120
-Ref: Variable Typing-Footnote-2374192
-Node: Comparison Operators374269
-Ref: table-relational-ops374688
-Node: POSIX String Comparison378183
-Ref: POSIX String Comparison-Footnote-1379878
-Ref: POSIX String Comparison-Footnote-2380017
-Node: Boolean Ops380101
-Ref: Boolean Ops-Footnote-1384583
-Node: Conditional Exp384675
-Node: Function Calls386411
-Node: Precedence390288
-Node: Locales393947
-Node: Expressions Summary395579
-Node: Patterns and Actions398152
-Node: Pattern Overview399272
-Node: Regexp Patterns400949
-Node: Expression Patterns401491
-Node: Ranges405272
-Node: BEGIN/END408380
-Node: Using BEGIN/END409141
-Ref: Using BEGIN/END-Footnote-1411877
-Node: I/O And BEGIN/END411983
-Node: BEGINFILE/ENDFILE414297
-Node: Empty417204
-Node: Using Shell Variables417521
-Node: Action Overview419795
-Node: Statements422120
-Node: If Statement423968
-Node: While Statement425463
-Node: Do Statement427491
-Node: For Statement428639
-Node: Switch Statement431797
-Node: Break Statement434183
-Node: Continue Statement436275
-Node: Next Statement438102
-Node: Nextfile Statement440485
-Node: Exit Statement443137
-Node: Built-in Variables445540
-Node: User-modified446673
-Node: Auto-set454259
-Ref: Auto-set-Footnote-1468912
-Ref: Auto-set-Footnote-2469118
-Node: ARGC and ARGV469174
-Node: Pattern Action Summary473387
-Node: Arrays475817
-Node: Array Basics477146
-Node: Array Intro477990
-Ref: figure-array-elements479965
-Ref: Array Intro-Footnote-1482669
-Node: Reference to Elements482797
-Node: Assigning Elements485261
-Node: Array Example485752
-Node: Scanning an Array487511
-Node: Controlling Scanning490533
-Ref: Controlling Scanning-Footnote-1495932
-Node: Numeric Array Subscripts496248
-Node: Uninitialized Subscripts498432
-Node: Delete500051
-Ref: Delete-Footnote-1502803
-Node: Multidimensional502860
-Node: Multiscanning505955
-Node: Arrays of Arrays507546
-Node: Arrays Summary512313
-Node: Functions514406
-Node: Built-in515444
-Node: Calling Built-in516525
-Node: Numeric Functions518521
-Ref: Numeric Functions-Footnote-1523354
-Ref: Numeric Functions-Footnote-2523711
-Ref: Numeric Functions-Footnote-3523759
-Node: String Functions524031
-Ref: String Functions-Footnote-1547535
-Ref: String Functions-Footnote-2547663
-Ref: String Functions-Footnote-3547911
-Node: Gory Details547998
-Ref: table-sub-escapes549789
-Ref: table-sub-proposed551308
-Ref: table-posix-sub552671
-Ref: table-gensub-escapes554212
-Ref: Gory Details-Footnote-1555035
-Node: I/O Functions555189
-Ref: table-system-return-values561771
-Ref: I/O Functions-Footnote-1563751
-Ref: I/O Functions-Footnote-2563899
-Node: Time Functions564019
-Ref: Time Functions-Footnote-1574541
-Ref: Time Functions-Footnote-2574609
-Ref: Time Functions-Footnote-3574767
-Ref: Time Functions-Footnote-4574878
-Ref: Time Functions-Footnote-5574990
-Ref: Time Functions-Footnote-6575217
-Node: Bitwise Functions575483
-Ref: table-bitwise-ops576077
-Ref: Bitwise Functions-Footnote-1582103
-Ref: Bitwise Functions-Footnote-2582276
-Node: Type Functions582467
-Node: I18N Functions585143
-Node: User-defined586794
-Node: Definition Syntax587599
-Ref: Definition Syntax-Footnote-1593286
-Node: Function Example593357
-Ref: Function Example-Footnote-1596279
-Node: Function Caveats596301
-Node: Calling A Function596819
-Node: Variable Scope597777
-Node: Pass By Value/Reference600771
-Node: Return Statement604270
-Node: Dynamic Typing607249
-Node: Indirect Calls608179
-Ref: Indirect Calls-Footnote-1618430
-Node: Functions Summary618558
-Node: Library Functions621263
-Ref: Library Functions-Footnote-1624870
-Ref: Library Functions-Footnote-2625013
-Node: Library Names625184
-Ref: Library Names-Footnote-1628644
-Ref: Library Names-Footnote-2628867
-Node: General Functions628953
-Node: Strtonum Function630056
-Node: Assert Function633078
-Node: Round Function636404
-Node: Cliff Random Function637945
-Node: Ordinal Functions638961
-Ref: Ordinal Functions-Footnote-1642024
-Ref: Ordinal Functions-Footnote-2642276
-Node: Join Function642486
-Ref: Join Function-Footnote-1644256
-Node: Getlocaltime Function644456
-Node: Readfile Function648198
-Node: Shell Quoting650170
-Node: Data File Management651571
-Node: Filetrans Function652203
-Node: Rewind Function656299
-Node: File Checking658205
-Ref: File Checking-Footnote-1659539
-Node: Empty Files659740
-Node: Ignoring Assigns661719
-Node: Getopt Function663269
-Ref: Getopt Function-Footnote-1674738
-Node: Passwd Functions674938
-Ref: Passwd Functions-Footnote-1683777
-Node: Group Functions683865
-Ref: Group Functions-Footnote-1691763
-Node: Walking Arrays691970
-Node: Library Functions Summary694978
-Node: Library Exercises696384
-Node: Sample Programs696849
-Node: Running Examples697619
-Node: Clones698347
-Node: Cut Program699571
-Node: Egrep Program709500
-Ref: Egrep Program-Footnote-1717012
-Node: Id Program717122
-Node: Split Program720802
-Ref: Split Program-Footnote-1724261
-Node: Tee Program724390
-Node: Uniq Program727180
-Node: Wc Program734606
-Ref: Wc Program-Footnote-1738861
-Node: Miscellaneous Programs738955
-Node: Dupword Program740168
-Node: Alarm Program742198
-Node: Translate Program747053
-Ref: Translate Program-Footnote-1751618
-Node: Labels Program751888
-Ref: Labels Program-Footnote-1755239
-Node: Word Sorting755323
-Node: History Sorting759395
-Node: Extract Program761230
-Node: Simple Sed768759
-Node: Igawk Program771833
-Ref: Igawk Program-Footnote-1786164
-Ref: Igawk Program-Footnote-2786366
-Ref: Igawk Program-Footnote-3786488
-Node: Anagram Program786603
-Node: Signature Program789665
-Node: Programs Summary790912
-Node: Programs Exercises792126
-Ref: Programs Exercises-Footnote-1796255
-Node: Advanced Features796346
-Node: Nondecimal Data798336
-Node: Array Sorting799927
-Node: Controlling Array Traversal800627
-Ref: Controlling Array Traversal-Footnote-1808994
-Node: Array Sorting Functions809112
-Ref: Array Sorting Functions-Footnote-1814203
-Node: Two-way I/O814399
-Ref: Two-way I/O-Footnote-1820949
-Ref: Two-way I/O-Footnote-2821136
-Node: TCP/IP Networking821218
-Node: Profiling824336
-Ref: Profiling-Footnote-1832829
-Node: Advanced Features Summary833152
-Node: Internationalization834996
-Node: I18N and L10N836476
-Node: Explaining gettext837163
-Ref: Explaining gettext-Footnote-1843055
-Ref: Explaining gettext-Footnote-2843240
-Node: Programmer i18n843405
-Ref: Programmer i18n-Footnote-1848354
-Node: Translator i18n848403
-Node: String Extraction849197
-Ref: String Extraction-Footnote-1850329
-Node: Printf Ordering850415
-Ref: Printf Ordering-Footnote-1853201
-Node: I18N Portability853265
-Ref: I18N Portability-Footnote-1855721
-Node: I18N Example855784
-Ref: I18N Example-Footnote-1858590
-Node: Gawk I18N858663
-Node: I18N Summary859308
-Node: Debugger860649
-Node: Debugging861671
-Node: Debugging Concepts862112
-Node: Debugging Terms863921
-Node: Awk Debugging866496
-Node: Sample Debugging Session867402
-Node: Debugger Invocation867936
-Node: Finding The Bug869322
-Node: List of Debugger Commands875800
-Node: Breakpoint Control877133
-Node: Debugger Execution Control880827
-Node: Viewing And Changing Data884189
-Node: Execution Stack887563
-Node: Debugger Info889200
-Node: Miscellaneous Debugger Commands893271
-Node: Readline Support898359
-Node: Limitations899255
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-Node: Arbitrary Precision Arithmetic902643
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-Node: Copying1254334
-Node: GNU Free Documentation License1291873
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+Node: Additional Configuration Options1144871
+Node: Configuration Philosophy1146676
+Node: Non-Unix Installation1149045
+Node: PC Installation1149505
+Node: PC Binary Installation1150343
+Node: PC Compiling1150778
+Node: PC Using1151895
+Node: Cygwin1154940
+Node: MSYS1155710
+Node: VMS Installation1156211
+Node: VMS Compilation1157002
+Ref: VMS Compilation-Footnote-11158231
+Node: VMS Dynamic Extensions1158289
+Node: VMS Installation Details1159974
+Node: VMS Running1162227
+Node: VMS GNV1166506
+Node: VMS Old Gawk1167241
+Node: Bugs1167712
+Node: Bug address1168375
+Node: Usenet1170772
+Node: Maintainers1171547
+Node: Other Versions1172923
+Node: Installation summary1179507
+Node: Notes1180542
+Node: Compatibility Mode1181407
+Node: Additions1182189
+Node: Accessing The Source1183114
+Node: Adding Code1184549
+Node: New Ports1190768
+Node: Derived Files1195256
+Ref: Derived Files-Footnote-11200741
+Ref: Derived Files-Footnote-21200776
+Ref: Derived Files-Footnote-31201374
+Node: Future Extensions1201488
+Node: Implementation Limitations1202146
+Node: Extension Design1203329
+Node: Old Extension Problems1204483
+Ref: Old Extension Problems-Footnote-11206001
+Node: Extension New Mechanism Goals1206058
+Ref: Extension New Mechanism Goals-Footnote-11209422
+Node: Extension Other Design Decisions1209611
+Node: Extension Future Growth1211724
+Node: Old Extension Mechanism1212560
+Node: Notes summary1214323
+Node: Basic Concepts1215505
+Node: Basic High Level1216186
+Ref: figure-general-flow1216468
+Ref: figure-process-flow1217153
+Ref: Basic High Level-Footnote-11220454
+Node: Basic Data Typing1220639
+Node: Glossary1223967
+Node: Copying1255914
+Node: GNU Free Documentation License1293453
+Node: Index1318571
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index a419a668..4998f81e 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -933,6 +933,7 @@ particular records in a file and perform operations upon them.
 * Extension API Informational Variables:: Variables providing information about
                                         @command{gawk}'s invocation.
 * Extension API Boilerplate::           Boilerplate code for using the API.
+* Changes from API V1::                 Changes from V1 of the API.
 * Finding Extensions::                  How @command{gawk} finds compiled
                                         extensions.
 * Extension Example::                   Example C code for an extension.
@@ -32323,6 +32324,7 @@ This (rather large) @value{SECTION} describes the API in detail.
                                          redirections.
 * Extension API Variables::              Variables provided by the API.
 * Extension API Boilerplate::            Boilerplate code for using the API.
+* Changes from API V1::                  Changes from V1 of the API.
 @end menu
 
 @node Extension API Functions Introduction
@@ -32823,11 +32825,15 @@ or an underscore, which may be followed by any number of
 letters, digits, and underscores.
 Letter case in function names is significant.
 
-@item awk_value_t *(*const function)(int num_actual_args, awk_value_t *result, struct awk_ext_func *finfo);
+@item awk_value_t *(*const function)(int num_actual_args,
+@itemx @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ awk_value_t *result,
+@itemx @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ struct awk_ext_func *finfo);
 This is a pointer to the C function that provides the extension's
 functionality.
 The function must fill in @code{*result} with either a number
-or a string. @command{gawk} takes ownership of any string memory.
+or a string.
+@c FIXME: Change to a scalar - number, string or regex once regex api stuff is merged.
+@command{gawk} takes ownership of any string memory.
 As mentioned earlier, string memory @emph{must} come from one of
 @code{gawk_malloc()}, @code{gawk_calloc()}, or @code{gawk_realloc()}.
 
@@ -32862,9 +32868,9 @@ to @code{awk_true}.
 
 @item void *data;
 This is an opaque pointer to any data that an extension function may
-wish to have available when called.  Passing the @code{awk_ext_funct_t}
+wish to have available when called.  Passing the @code{awk_ext_func_t}
 structure to the extension function, and having this pointer available
-in it enables writing a single C or C++ function that implements multiple
+in it enable writing a single C or C++ function that implements multiple
 @command{awk}-level extension functions.
 @end table
 
@@ -32872,11 +32878,42 @@ Once you have a record representing your extension function, you register
 it with @command{gawk} using this API function:
 
 @table @code
-@item awk_bool_t add_ext_func(const char *namespace, const awk_ext_func_t *func);
+@item awk_bool_t add_ext_func(const char *namespace, awk_ext_func_t *func);
 This function returns true upon success, false otherwise.
 The @code{namespace} parameter is currently not used; you should pass in an
 empty string (@code{""}).  The @code{func} pointer is the address of a
 @code{struct} representing your function, as just described.
+
+@command{gawk} does not modify what @code{func} points to, but the
+extension function itself receives this pointer and can modify what it
+points to, thus it is purposely not declared to be @code{const}.
+@end table
+
+The combination of @code{min_required_args}, @code{max_expected_args},
+and @code{suppress_lint} may be confusing. Here is how you should
+set things up.
+
+@table @asis
+@item Any number of arguments is valid
+Set @code{min_required_args} and @code{max_expected_args} to zero and
+set @code{suppress_lint} to @code{awk_true}.
+
+@item A minimum number of arguments is required, no limit on maximum number of arguments
+Set @code{min_required_args} to the minimum required. Set
+@code{max_expected_args} to zero and
+set @code{suppress_lint} to @code{awk_true}.
+
+@item A minium number of arguments is required, a maximum number is expected
+Set @code{min_required_args} to the minimum required. Set
+@code{max_expected_args} to the maximum expected.
+Set @code{suppress_lint} to @code{awk_false}.
+
+@item A minum number of arguments is required, and no more than a maximum is allowed
+Set @code{min_required_args} to the minimum required. Set
+@code{max_expected_args} to the maximum expected.
+Set @code{suppress_lint} to @code{awk_false}.
+In your extension function, check that @code{num_actual_args} does not
+exceed @code{f->max_expected_args}. If it does, issue a fatal error message.
 @end table
 
 @node Exit Callback Functions
@@ -33617,13 +33654,6 @@ An extension can look up the value of @command{gawk}'s special variables.
 However, with the exception of the @code{PROCINFO} array, an extension
 cannot change any of those variables.
 
-@quotation CAUTION
-It is possible for the lookup of @code{PROCINFO} to fail. This happens if
-the @command{awk} program being run does not reference @code{PROCINFO};
-in this case, @command{gawk} doesn't bother to create the array and
-populate it.
-@end quotation
-
 @node Symbol table by cookie
 @subsubsection Variable Access and Update by Cookie
 
@@ -34509,10 +34539,10 @@ debugging:
 
 @float Table,gawk-api-version
 @caption{gawk API version constants}
-@multitable @columnfractions .33 .33 .33
+@multitable {@b{API Version}} {@code{gawk_api_major_version}} {@code{GAWK_API_MAJOR_VERSION}}
 @headitem API Version @tab C preprocessor define @tab enum constant
-@item Major @tab gawk_api_major_version @tab GAWK_API_MAJOR_VERSION
-@item Minor @tab gawk_api_minor_version @tab GAWK_API_MINOR_VERSION
+@item Major @tab @code{gawk_api_major_version} @tab @code{GAWK_API_MAJOR_VERSION}
+@item Minor @tab @code{gawk_api_minor_version} @tab @code{GAWK_API_MINOR_VERSION}
 @end multitable
 @end float
 
@@ -34531,10 +34561,10 @@ constant integers:
 
 @table @code
 @item api->major_version
-The major version of the running @command{gawk}
+The major version of the running @command{gawk}.
 
 @item api->minor_version
-The minor version of the running @command{gawk}
+The minor version of the running @command{gawk}.
 @end table
 
 It is up to the extension to decide if there are API incompatibilities.
@@ -34607,7 +34637,7 @@ static awk_ext_id_t ext_id;
 static const char *ext_version = NULL; /* or @dots{} = "some string" */
 
 static awk_ext_func_t func_table[] = @{
-    @{ "name", do_name, 1 @},
+    @{ "name", do_name, 1, 0, awk_false, NULL @},
     /* @dots{} */
 @};
 
@@ -34708,6 +34738,19 @@ If @code{ext_version} is not @code{NULL}, register
 the version string with @command{gawk}.
 @end enumerate
 
+
+@node Changes from API V1
+@subsection Changes From Version 1 of the API
+
+The current API is @emph{not} binary compatible with version 1 of the API.
+You will have to recompile your extensions in order to use them with
+the current version of @command{gawk}.
+
+Fortunately, at the possible expense of some compile-time warnings, the API remains
+source-code--compatible with the previous API. The major differences are
+the additional members in the @code{awk_ext_func_t} structure, and the
+addition of the third argument to the C implementation function.
+
 @node Finding Extensions
 @section How @command{gawk} Finds Extensions
 @cindex extension search path
@@ -34948,17 +34991,12 @@ The second is a pointer to an @code{awk_value_t} structure, usually named
 /*  do_chdir --- provide dynamically loaded chdir() function for gawk */
 
 static awk_value_t *
-do_chdir(int nargs, awk_value_t *result)
+do_chdir(int nargs, awk_value_t *result, struct awk_ext_func *unused)
 @{
     awk_value_t newdir;
     int ret = -1;
 
     assert(result != NULL);
-
-    if (do_lint && nargs != 1)
-        lintwarn(ext_id,
-                 _("chdir: called with incorrect number of arguments, "
-                   "expecting 1"));
 @end example
 
 The @code{newdir}
@@ -34967,8 +35005,8 @@ with @code{get_argument()}.  Note that the first argument is
 numbered zero.
 
 If the argument is retrieved successfully, the function calls the
-@code{chdir()} system call. If the @code{chdir()} fails, @code{ERRNO}
-is updated:
+@code{chdir()} system call. Otherwise, if the @code{chdir()} fails,
+it updates @code{ERRNO}:
 
 @example
     if (get_argument(0, AWK_STRING, & newdir)) @{
@@ -35172,15 +35210,11 @@ is set to point to @code{stat()}, instead.
 Here is the @code{do_stat()} function, which starts with
 variable declarations and argument checking:
 
-@ignore
-Changed message for page breaking. Used to be:
-    "stat: called with incorrect number of arguments (%d), should be 2",
-@end ignore
 @example
 /* do_stat --- provide a stat() function for gawk */
 
 static awk_value_t *
-do_stat(int nargs, awk_value_t *result)
+do_stat(int nargs, awk_value_t *result, struct awk_ext_func *unused)
 @{
     awk_value_t file_param, array_param;
     char *name;
@@ -35191,13 +35225,6 @@ do_stat(int nargs, awk_value_t *result)
     int (*statfunc)(const char *path, struct stat *sbuf) = lstat;
 
     assert(result != NULL);
-
-    if (nargs != 2 && nargs != 3) @{
-        if (do_lint)
-            lintwarn(ext_id,
-               _("stat: called with wrong number of arguments"));
-        return make_number(-1, result);
-    @}
 @end example
 
 Then comes the actual work. First, the function gets the arguments.
@@ -35265,11 +35292,9 @@ structures for loading each function into @command{gawk}:
 
 @example
 static awk_ext_func_t func_table[] = @{
-    @{ "chdir", do_chdir, 1 @},
-    @{ "stat",  do_stat, 2 @},
-#ifndef __MINGW32__
-    @{ "fts",   do_fts, 3 @},
-#endif
+    @{ "chdir", do_chdir, 1, 1, awk_false, NULL @},
+    @{ "stat",  do_stat, 3, 2, awk_false, NULL @},
+    @dots{}
 @};
 @end example
 
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 987c541d..ca571514 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -928,6 +928,7 @@ particular records in a file and perform operations upon them.
 * Extension API Informational Variables:: Variables providing information about
                                         @command{gawk}'s invocation.
 * Extension API Boilerplate::           Boilerplate code for using the API.
+* Changes from API V1::                 Changes from V1 of the API.
 * Finding Extensions::                  How @command{gawk} finds compiled
                                         extensions.
 * Extension Example::                   Example C code for an extension.
@@ -31337,6 +31338,7 @@ This (rather large) @value{SECTION} describes the API in detail.
                                          redirections.
 * Extension API Variables::              Variables provided by the API.
 * Extension API Boilerplate::            Boilerplate code for using the API.
+* Changes from API V1::                  Changes from V1 of the API.
 @end menu
 
 @node Extension API Functions Introduction
@@ -31837,11 +31839,15 @@ or an underscore, which may be followed by any number of
 letters, digits, and underscores.
 Letter case in function names is significant.
 
-@item awk_value_t *(*const function)(int num_actual_args, awk_value_t *result, struct awk_ext_func *finfo);
+@item awk_value_t *(*const function)(int num_actual_args,
+@itemx @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ awk_value_t *result,
+@itemx @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ struct awk_ext_func *finfo);
 This is a pointer to the C function that provides the extension's
 functionality.
 The function must fill in @code{*result} with either a number
-or a string. @command{gawk} takes ownership of any string memory.
+or a string.
+@c FIXME: Change to a scalar - number, string or regex once regex api stuff is merged.
+@command{gawk} takes ownership of any string memory.
 As mentioned earlier, string memory @emph{must} come from one of
 @code{gawk_malloc()}, @code{gawk_calloc()}, or @code{gawk_realloc()}.
 
@@ -31876,9 +31882,9 @@ to @code{awk_true}.
 
 @item void *data;
 This is an opaque pointer to any data that an extension function may
-wish to have available when called.  Passing the @code{awk_ext_funct_t}
+wish to have available when called.  Passing the @code{awk_ext_func_t}
 structure to the extension function, and having this pointer available
-in it enables writing a single C or C++ function that implements multiple
+in it enable writing a single C or C++ function that implements multiple
 @command{awk}-level extension functions.
 @end table
 
@@ -31886,11 +31892,42 @@ Once you have a record representing your extension function, you register
 it with @command{gawk} using this API function:
 
 @table @code
-@item awk_bool_t add_ext_func(const char *namespace, const awk_ext_func_t *func);
+@item awk_bool_t add_ext_func(const char *namespace, awk_ext_func_t *func);
 This function returns true upon success, false otherwise.
 The @code{namespace} parameter is currently not used; you should pass in an
 empty string (@code{""}).  The @code{func} pointer is the address of a
 @code{struct} representing your function, as just described.
+
+@command{gawk} does not modify what @code{func} points to, but the
+extension function itself receives this pointer and can modify what it
+points to, thus it is purposely not declared to be @code{const}.
+@end table
+
+The combination of @code{min_required_args}, @code{max_expected_args},
+and @code{suppress_lint} may be confusing. Here is how you should
+set things up.
+
+@table @asis
+@item Any number of arguments is valid
+Set @code{min_required_args} and @code{max_expected_args} to zero and
+set @code{suppress_lint} to @code{awk_true}.
+
+@item A minimum number of arguments is required, no limit on maximum number of arguments
+Set @code{min_required_args} to the minimum required. Set
+@code{max_expected_args} to zero and
+set @code{suppress_lint} to @code{awk_true}.
+
+@item A minium number of arguments is required, a maximum number is expected
+Set @code{min_required_args} to the minimum required. Set
+@code{max_expected_args} to the maximum expected.
+Set @code{suppress_lint} to @code{awk_false}.
+
+@item A minum number of arguments is required, and no more than a maximum is allowed
+Set @code{min_required_args} to the minimum required. Set
+@code{max_expected_args} to the maximum expected.
+Set @code{suppress_lint} to @code{awk_false}.
+In your extension function, check that @code{num_actual_args} does not
+exceed @code{f->max_expected_args}. If it does, issue a fatal error message.
 @end table
 
 @node Exit Callback Functions
@@ -32631,13 +32668,6 @@ An extension can look up the value of @command{gawk}'s special variables.
 However, with the exception of the @code{PROCINFO} array, an extension
 cannot change any of those variables.
 
-@quotation CAUTION
-It is possible for the lookup of @code{PROCINFO} to fail. This happens if
-the @command{awk} program being run does not reference @code{PROCINFO};
-in this case, @command{gawk} doesn't bother to create the array and
-populate it.
-@end quotation
-
 @node Symbol table by cookie
 @subsubsection Variable Access and Update by Cookie
 
@@ -33523,10 +33553,10 @@ debugging:
 
 @float Table,gawk-api-version
 @caption{gawk API version constants}
-@multitable @columnfractions .33 .33 .33
+@multitable {@b{API Version}} {@code{gawk_api_major_version}} {@code{GAWK_API_MAJOR_VERSION}}
 @headitem API Version @tab C preprocessor define @tab enum constant
-@item Major @tab gawk_api_major_version @tab GAWK_API_MAJOR_VERSION
-@item Minor @tab gawk_api_minor_version @tab GAWK_API_MINOR_VERSION
+@item Major @tab @code{gawk_api_major_version} @tab @code{GAWK_API_MAJOR_VERSION}
+@item Minor @tab @code{gawk_api_minor_version} @tab @code{GAWK_API_MINOR_VERSION}
 @end multitable
 @end float
 
@@ -33545,10 +33575,10 @@ constant integers:
 
 @table @code
 @item api->major_version
-The major version of the running @command{gawk}
+The major version of the running @command{gawk}.
 
 @item api->minor_version
-The minor version of the running @command{gawk}
+The minor version of the running @command{gawk}.
 @end table
 
 It is up to the extension to decide if there are API incompatibilities.
@@ -33621,7 +33651,7 @@ static awk_ext_id_t ext_id;
 static const char *ext_version = NULL; /* or @dots{} = "some string" */
 
 static awk_ext_func_t func_table[] = @{
-    @{ "name", do_name, 1 @},
+    @{ "name", do_name, 1, 0, awk_false, NULL @},
     /* @dots{} */
 @};
 
@@ -33722,6 +33752,19 @@ If @code{ext_version} is not @code{NULL}, register
 the version string with @command{gawk}.
 @end enumerate
 
+
+@node Changes from API V1
+@subsection Changes From Version 1 of the API
+
+The current API is @emph{not} binary compatible with version 1 of the API.
+You will have to recompile your extensions in order to use them with
+the current version of @command{gawk}.
+
+Fortunately, at the possible expense of some compile-time warnings, the API remains
+source-code--compatible with the previous API. The major differences are
+the additional members in the @code{awk_ext_func_t} structure, and the
+addition of the third argument to the C implementation function.
+
 @node Finding Extensions
 @section How @command{gawk} Finds Extensions
 @cindex extension search path
@@ -33962,17 +34005,12 @@ The second is a pointer to an @code{awk_value_t} structure, usually named
 /*  do_chdir --- provide dynamically loaded chdir() function for gawk */
 
 static awk_value_t *
-do_chdir(int nargs, awk_value_t *result)
+do_chdir(int nargs, awk_value_t *result, struct awk_ext_func *unused)
 @{
     awk_value_t newdir;
     int ret = -1;
 
     assert(result != NULL);
-
-    if (do_lint && nargs != 1)
-        lintwarn(ext_id,
-                 _("chdir: called with incorrect number of arguments, "
-                   "expecting 1"));
 @end example
 
 The @code{newdir}
@@ -33981,8 +34019,8 @@ with @code{get_argument()}.  Note that the first argument is
 numbered zero.
 
 If the argument is retrieved successfully, the function calls the
-@code{chdir()} system call. If the @code{chdir()} fails, @code{ERRNO}
-is updated:
+@code{chdir()} system call. Otherwise, if the @code{chdir()} fails,
+it updates @code{ERRNO}:
 
 @example
     if (get_argument(0, AWK_STRING, & newdir)) @{
@@ -34186,15 +34224,11 @@ is set to point to @code{stat()}, instead.
 Here is the @code{do_stat()} function, which starts with
 variable declarations and argument checking:
 
-@ignore
-Changed message for page breaking. Used to be:
-    "stat: called with incorrect number of arguments (%d), should be 2",
-@end ignore
 @example
 /* do_stat --- provide a stat() function for gawk */
 
 static awk_value_t *
-do_stat(int nargs, awk_value_t *result)
+do_stat(int nargs, awk_value_t *result, struct awk_ext_func *unused)
 @{
     awk_value_t file_param, array_param;
     char *name;
@@ -34205,13 +34239,6 @@ do_stat(int nargs, awk_value_t *result)
     int (*statfunc)(const char *path, struct stat *sbuf) = lstat;
 
     assert(result != NULL);
-
-    if (nargs != 2 && nargs != 3) @{
-        if (do_lint)
-            lintwarn(ext_id,
-               _("stat: called with wrong number of arguments"));
-        return make_number(-1, result);
-    @}
 @end example
 
 Then comes the actual work. First, the function gets the arguments.
@@ -34279,11 +34306,9 @@ structures for loading each function into @command{gawk}:
 
 @example
 static awk_ext_func_t func_table[] = @{
-    @{ "chdir", do_chdir, 1 @},
-    @{ "stat",  do_stat, 2 @},
-#ifndef __MINGW32__
-    @{ "fts",   do_fts, 3 @},
-#endif
+    @{ "chdir", do_chdir, 1, 1, awk_false, NULL @},
+    @{ "stat",  do_stat, 3, 2, awk_false, NULL @},
+    @dots{}
 @};
 @end example
 
diff --git a/gawkapi.h b/gawkapi.h
index 337fef8a..aae3ac0a 100644
--- a/gawkapi.h
+++ b/gawkapi.h
@@ -428,7 +428,12 @@ typedef struct gawk_api {
 
 	/* Next, registration functions: */
 
-	/* Add a function to the interpreter, returns true upon success */
+	/*
+	 * Add a function to the interpreter, returns true upon success. 
+	 * Gawk does not modify what func points to, but the extension
+	 * function itself receives this pointer and can modify what it
+	 * points to, thus it's not const.
+	 */
 	awk_bool_t (*api_add_ext_func)(awk_ext_id_t id, const char *namespace,
 			awk_ext_func_t *func);
 
diff --git a/interpret.h b/interpret.h
index 7a8db88d..1399e720 100644
--- a/interpret.h
+++ b/interpret.h
@@ -965,7 +965,7 @@ arrayfor:
 				fatal(_("%s: called with %lu arguments, expecting at least %lu"),
 						pc[1].func_name, arg_count, min_req);
 
-			if (do_lint && max_expect > 0 && arg_count > max_expect && ! f->suppress_lint)
+			if (do_lint && ! f->suppress_lint && arg_count > max_expect)
 				lintwarn(_("%s: called with %lu arguments, expecting no more than %lu"),
 						pc[1].func_name, arg_count, max_expect);