Move param checking against function names into --posix.

14 files changed, 403 insertions, 363 deletions

diff --git a/ChangeLog b/ChangeLog
index e5c7c091..6f626cd7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2015-02-01         Arnold D. Robbins     <arnold@skeeve.com>
+
+	Move POSIX requirement for disallowing paramater names with the
+	same name as a function into --posix.
+
+	* NEWS: Document it.
+	* awkgram.y (parse_program): Check do_posix before calling
+	check_param_names().
+	* symbol.c (check_param_names): Set up a fake node and call
+	in_array() for function parameter names instead of linear
+	searching the function list a second time. Thanks to Andrew
+	Schorr for the motivation.
+
 2015-01-30         Arnold D. Robbins     <arnold@skeeve.com>
 
 	Don't allow function parameter names to be the same as function
diff --git a/NEWS b/NEWS
index 21568ea3..ba86e965 100644
--- a/NEWS
+++ b/NEWS
@@ -49,7 +49,7 @@ Changes from 4.1.1 to 4.1.2
 11. POSIX requires that the names of function parameters not be the
     same as any of the special built-in variables and also not conflict
     with the names of any functions. Gawk has checked for the former
-    since 3.1.7. It now also checks for the latter.
+    since 3.1.7. With --posix, it now also checks for the latter.
 
 XX. A number of bugs have been fixed. See the ChangeLog.
 
diff --git a/awkgram.c b/awkgram.c
index 9a9ca13b..20d3506a 100644
--- a/awkgram.c
+++ b/awkgram.c
@@ -4661,7 +4661,7 @@ parse_program(INSTRUCTION **pcode)
 	if (ret == 0)	/* avoid spurious warning if parser aborted with YYABORT */
 		check_funcs();
 
-	if (! check_param_names())
+	if (do_posix && ! check_param_names())
 		errcount++;
 
 	if (args_array == NULL)
diff --git a/awkgram.y b/awkgram.y
index 55615c13..ef7c139a 100644
--- a/awkgram.y
+++ b/awkgram.y
@@ -2322,7 +2322,7 @@ parse_program(INSTRUCTION **pcode)
 	if (ret == 0)	/* avoid spurious warning if parser aborted with YYABORT */
 		check_funcs();
 
-	if (! check_param_names())
+	if (do_posix && ! check_param_names())
 		errcount++;
 
 	if (args_array == NULL)
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 61caac69..904cd326 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,9 @@
+2015-02-01         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in: POSIX requirement that function parameters cannot
+	have the same name as a function is now --posix.
+	Restore indirectcall example.
+
 2015-01-30         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in: Document POSIX requirement that function parameters
diff --git a/doc/gawk.info b/doc/gawk.info
index 4e975b14..ca168110 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -13464,8 +13464,11 @@ have a parameter with the same name as the function itself.
      CAUTION: According to the POSIX standard, function parameters
      cannot have the same name as one of the special predefined
      variables (*note Built-in Variables::), nor may a function
-     parameter have the same name as another function.  Not all
-     versions of `awk' enforce these restrictions.
+     parameter have the same name as another function.
+
+     Not all versions of `awk' enforce these restrictions.  `gawk'
+     always enforces the first restriction.  With `--posix' (*note
+     Options::), it also enforces the second restriction.
 
    Local variables act like the empty string if referenced where a
 string value is required, and like zero if referenced where a numeric
@@ -14067,13 +14070,13 @@ using indirect function calls:
 
      # average --- return the average of the values in fields $first - $last
 
-     function average(first, last,   the_sum, i)
+     function average(first, last,   sum, i)
      {
-         the_sum = 0;
+         sum = 0;
          for (i = first; i <= last; i++)
-             the_sum += $i
+             sum += $i
 
-         return the_sum / (last - first + 1)
+         return sum / (last - first + 1)
      }
 
      # sum --- return the sum of the values in fields $first - $last
@@ -32159,7 +32162,7 @@ Index
 * common extensions, \x escape sequence: Escape Sequences.    (line  61)
 * common extensions, BINMODE variable:   PC Using.            (line  33)
 * common extensions, delete to delete entire arrays: Delete.  (line  39)
-* common extensions, func keyword:       Definition Syntax.   (line  95)
+* common extensions, func keyword:       Definition Syntax.   (line  98)
 * common extensions, length() applied to an array: String Functions.
                                                               (line 201)
 * common extensions, RS as a regexp:     gawk split records.  (line   6)
@@ -32680,7 +32683,7 @@ Index
 * extensions, common, BINMODE variable:  PC Using.            (line  33)
 * extensions, common, delete to delete entire arrays: Delete. (line  39)
 * extensions, common, fflush() function: I/O Functions.       (line  43)
-* extensions, common, func keyword:      Definition Syntax.   (line  95)
+* extensions, common, func keyword:      Definition Syntax.   (line  98)
 * extensions, common, length() applied to an array: String Functions.
                                                               (line 201)
 * extensions, common, RS as a regexp:    gawk split records.  (line   6)
@@ -32897,7 +32900,7 @@ Index
 * functions, library, user database, reading: Passwd Functions.
                                                               (line   6)
 * functions, names of:                   Definition Syntax.   (line  23)
-* functions, recursive:                  Definition Syntax.   (line  85)
+* functions, recursive:                  Definition Syntax.   (line  88)
 * functions, string-translation:         I18N Functions.      (line   6)
 * functions, undefined:                  Pass By Value/Reference.
                                                               (line  68)
@@ -33618,7 +33621,7 @@ Index
                                                               (line  65)
 * portability, deleting array elements:  Delete.              (line  56)
 * portability, example programs:         Library Functions.   (line  42)
-* portability, functions, defining:      Definition Syntax.   (line 111)
+* portability, functions, defining:      Definition Syntax.   (line 114)
 * portability, gawk:                     New Ports.           (line   6)
 * portability, gettext library and:      Explaining gettext.  (line  11)
 * portability, internationalization and: I18N Portability.    (line   6)
@@ -33663,7 +33666,7 @@ Index
 * POSIX awk, field separators and <1>:   Full Line Fields.    (line  16)
 * POSIX awk, field separators and:       Fields.              (line   6)
 * POSIX awk, FS variable and:            User-modified.       (line  60)
-* POSIX awk, function keyword in:        Definition Syntax.   (line  95)
+* POSIX awk, function keyword in:        Definition Syntax.   (line  98)
 * POSIX awk, functions and, gsub()/sub(): Gory Details.       (line  90)
 * POSIX awk, functions and, length():    String Functions.    (line 180)
 * POSIX awk, GNU long options and:       Options.             (line  15)
@@ -33756,7 +33759,7 @@ Index
 * programming conventions, functions, calling: Calling Built-in.
                                                               (line  10)
 * programming conventions, functions, writing: Definition Syntax.
-                                                              (line  67)
+                                                              (line  70)
 * programming conventions, gawk extensions: Internal File Ops.
                                                               (line  45)
 * programming conventions, private variable names: Library Names.
@@ -33825,7 +33828,7 @@ Index
 * records, splitting input into:         Records.             (line   6)
 * records, terminating:                  awk split records.   (line 125)
 * records, treating files as:            gawk split records.  (line  93)
-* recursive functions:                   Definition Syntax.   (line  85)
+* recursive functions:                   Definition Syntax.   (line  88)
 * redirect gawk output, in debugger:     Debugger Info.       (line  72)
 * redirection of input:                  Getline/File.        (line   6)
 * redirection of output:                 Redirection.         (line   6)
@@ -33994,7 +33997,7 @@ Index
 * set directory of message catalogs:     I18N Functions.      (line  12)
 * set watchpoint:                        Viewing And Changing Data.
                                                               (line  67)
-* shadowing of variable values:          Definition Syntax.   (line  73)
+* shadowing of variable values:          Definition Syntax.   (line  76)
 * shell quoting, rules for:              Quoting.             (line   6)
 * shells, piping commands into:          Redirection.         (line 136)
 * shells, quoting:                       Using Shell Variables.
@@ -34368,7 +34371,7 @@ Index
 * variables, predefined conveying information: Auto-set.      (line   6)
 * variables, private:                    Library Names.       (line  11)
 * variables, setting:                    Options.             (line  32)
-* variables, shadowing:                  Definition Syntax.   (line  73)
+* variables, shadowing:                  Definition Syntax.   (line  76)
 * variables, types of:                   Assignment Ops.      (line  40)
 * variables, types of, comparison expressions and: Typing and Comparison.
                                                               (line   9)
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+Node: Try To Round895918
+Node: Setting precision896817
+Ref: table-predefined-precision-strings897501
+Node: Setting the rounding mode899290
+Ref: table-gawk-rounding-modes899654
+Ref: Setting the rounding mode-Footnote-1903109
+Node: Arbitrary Precision Integers903288
+Ref: Arbitrary Precision Integers-Footnote-1906274
+Node: POSIX Floating Point Problems906423
+Ref: POSIX Floating Point Problems-Footnote-1910296
+Node: Floating point summary910334
+Node: Dynamic Extensions912528
+Node: Extension Intro914080
+Node: Plugin License915346
+Node: Extension Mechanism Outline916143
+Ref: figure-load-extension916571
+Ref: figure-register-new-function918051
+Ref: figure-call-new-function919055
+Node: Extension API Description921041
+Node: Extension API Functions Introduction922491
+Node: General Data Types927315
+Ref: General Data Types-Footnote-1933054
+Node: Memory Allocation Functions933353
+Ref: Memory Allocation Functions-Footnote-1936192
+Node: Constructor Functions936288
+Node: Registration Functions938022
+Node: Extension Functions938707
+Node: Exit Callback Functions941004
+Node: Extension Version String942252
+Node: Input Parsers942917
+Node: Output Wrappers952796
+Node: Two-way processors957311
+Node: Printing Messages959515
+Ref: Printing Messages-Footnote-1960591
+Node: Updating `ERRNO'960743
+Node: Requesting Values961483
+Ref: table-value-types-returned962211
+Node: Accessing Parameters963168
+Node: Symbol Table Access964399
+Node: Symbol table by name964913
+Node: Symbol table by cookie966894
+Ref: Symbol table by cookie-Footnote-1971038
+Node: Cached values971101
+Ref: Cached values-Footnote-1974600
+Node: Array Manipulation974691
+Ref: Array Manipulation-Footnote-1975789
+Node: Array Data Types975826
+Ref: Array Data Types-Footnote-1978481
+Node: Array Functions978573
+Node: Flattening Arrays982427
+Node: Creating Arrays989319
+Node: Extension API Variables994090
+Node: Extension Versioning994726
+Node: Extension API Informational Variables996627
+Node: Extension API Boilerplate997692
+Node: Finding Extensions1001501
+Node: Extension Example1002061
+Node: Internal File Description1002833
+Node: Internal File Ops1006900
+Ref: Internal File Ops-Footnote-11018570
+Node: Using Internal File Ops1018710
+Ref: Using Internal File Ops-Footnote-11021093
+Node: Extension Samples1021366
+Node: Extension Sample File Functions1022892
+Node: Extension Sample Fnmatch1030530
+Node: Extension Sample Fork1032021
+Node: Extension Sample Inplace1033236
+Node: Extension Sample Ord1034911
+Node: Extension Sample Readdir1035747
+Ref: table-readdir-file-types1036623
+Node: Extension Sample Revout1037434
+Node: Extension Sample Rev2way1038024
+Node: Extension Sample Read write array1038764
+Node: Extension Sample Readfile1040704
+Node: Extension Sample Time1041799
+Node: Extension Sample API Tests1043148
+Node: gawkextlib1043639
+Node: Extension summary1046297
+Node: Extension Exercises1049986
+Node: Language History1050708
+Node: V7/SVR3.11052364
+Node: SVR41054545
+Node: POSIX1055990
+Node: BTL1057379
+Node: POSIX/GNU1058113
+Node: Feature History1063677
+Node: Common Extensions1076775
+Node: Ranges and Locales1078099
+Ref: Ranges and Locales-Footnote-11082717
+Ref: Ranges and Locales-Footnote-21082744
+Ref: Ranges and Locales-Footnote-31082978
+Node: Contributors1083199
+Node: History summary1088740
+Node: Installation1090110
+Node: Gawk Distribution1091056
+Node: Getting1091540
+Node: Extracting1092363
+Node: Distribution contents1093998
+Node: Unix Installation1099715
+Node: Quick Installation1100332
+Node: Additional Configuration Options1102756
+Node: Configuration Philosophy1104494
+Node: Non-Unix Installation1106863
+Node: PC Installation1107321
+Node: PC Binary Installation1108640
+Node: PC Compiling1110488
+Ref: PC Compiling-Footnote-11113509
+Node: PC Testing1113618
+Node: PC Using1114794
+Node: Cygwin1118909
+Node: MSYS1119732
+Node: VMS Installation1120232
+Node: VMS Compilation1121024
+Ref: VMS Compilation-Footnote-11122246
+Node: VMS Dynamic Extensions1122304
+Node: VMS Installation Details1123988
+Node: VMS Running1126240
+Node: VMS GNV1129076
+Node: VMS Old Gawk1129810
+Node: Bugs1130280
+Node: Other Versions1134163
+Node: Installation summary1140587
+Node: Notes1141643
+Node: Compatibility Mode1142508
+Node: Additions1143290
+Node: Accessing The Source1144215
+Node: Adding Code1145650
+Node: New Ports1151807
+Node: Derived Files1156289
+Ref: Derived Files-Footnote-11161764
+Ref: Derived Files-Footnote-21161798
+Ref: Derived Files-Footnote-31162394
+Node: Future Extensions1162508
+Node: Implementation Limitations1163114
+Node: Extension Design1164362
+Node: Old Extension Problems1165516
+Ref: Old Extension Problems-Footnote-11167033
+Node: Extension New Mechanism Goals1167090
+Ref: Extension New Mechanism Goals-Footnote-11170450
+Node: Extension Other Design Decisions1170639
+Node: Extension Future Growth1172747
+Node: Old Extension Mechanism1173583
+Node: Notes summary1175345
+Node: Basic Concepts1176531
+Node: Basic High Level1177212
+Ref: figure-general-flow1177484
+Ref: figure-process-flow1178083
+Ref: Basic High Level-Footnote-11181312
+Node: Basic Data Typing1181497
+Node: Glossary1184825
+Node: Copying1216754
+Node: GNU Free Documentation License1254310
+Node: Index1279446
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index df5afc63..7e8d93de 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -19342,8 +19342,12 @@ According to the POSIX standard, function parameters
 cannot have the same name as one of the special predefined variables
 (@pxref{Built-in Variables}), nor may a function parameter have the
 same name as another function.
+
 Not all versions of @command{awk} enforce
 these restrictions.
+@command{gawk} always enforces the first restriction.
+With @option{--posix} (@pxref{Options}),
+it also enforces the second restriction.
 @end quotation
 
 Local variables act like the empty string if referenced where a string
@@ -20061,13 +20065,13 @@ using indirect function calls:
 @c file eg/prog/indirectcall.awk
 # average --- return the average of the values in fields $first - $last
 
-function average(first, last,   the_sum, i)
+function average(first, last,   sum, i)
 @{
-    the_sum = 0;
+    sum = 0;
     for (i = first; i <= last; i++)
-        the_sum += $i
+        sum += $i
 
-    return the_sum / (last - first + 1)
+    return sum / (last - first + 1)
 @}
 
 # sum --- return the sum of the values in fields $first - $last
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 0723a4c2..125e8401 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -18463,8 +18463,12 @@ According to the POSIX standard, function parameters
 cannot have the same name as one of the special predefined variables
 (@pxref{Built-in Variables}), nor may a function parameter have the
 same name as another function.
+
 Not all versions of @command{awk} enforce
 these restrictions.
+@command{gawk} always enforces the first restriction.
+With @option{--posix} (@pxref{Options}),
+it also enforces the second restriction.
 @end quotation
 
 Local variables act like the empty string if referenced where a string
@@ -19182,13 +19186,13 @@ using indirect function calls:
 @c file eg/prog/indirectcall.awk
 # average --- return the average of the values in fields $first - $last
 
-function average(first, last,   the_sum, i)
+function average(first, last,   sum, i)
 @{
-    the_sum = 0;
+    sum = 0;
     for (i = first; i <= last; i++)
-        the_sum += $i
+        sum += $i
 
-    return the_sum / (last - first + 1)
+    return sum / (last - first + 1)
 @}
 
 # sum --- return the sum of the values in fields $first - $last
diff --git a/symbol.c b/symbol.c
index 552c111e..cbfb1edf 100644
--- a/symbol.c
+++ b/symbol.c
@@ -630,14 +630,23 @@ load_symbols()
 bool
 check_param_names(void)
 {
-	int i, j, k;
+	int i, j;
 	NODE **list;
 	NODE *f;
 	long max;
 	bool result = true;
+	NODE n;
+
+	if (func_table->table_size == 0)
+		return result;
 
 	max = func_table->table_size * 2;
 
+	memset(& n, sizeof n, 0);
+	n.type = Node_val;
+	n.flags = STRING|STRCUR;
+	n.stfmt = -1;
+
 	/*
 	 * assoc_list() returns an array with two elements per awk array
 	 * element. Elements i and i+1 in the C array represent the key
@@ -650,10 +659,6 @@ check_param_names(void)
 
 	list = assoc_list(func_table, "@unsorted", ASORTI);
 
-	/*
-	 * You want linear searches?
-	 * Have we got linear searches!
-	 */
 	for (i = 0; i < max; i += 2) {
 		f = list[i+1];
 		if (f->type == Node_builtin_func || f->param_cnt == 0)
@@ -662,16 +667,17 @@ check_param_names(void)
 		/* loop over each param in function i */
 		for (j = 0; j < f->param_cnt; j++) {
 			/* compare to function names */
-			for (k = 0; k < max; k += 2) {
-				if (k == i)
-					continue;
-				if (strcmp(f->fparms[j].param, list[k]->stptr) == 0) {
-					error(
-				_("function `%s': can't use function `%s' as a parameter name"),
-						list[i]->stptr,
-						list[k]->stptr);
-					result = false;
-				}
+
+			/* use a fake node to avoid malloc/free of make_string */
+			n.stptr = f->fparms[j].param;
+			n.stlen = strlen(f->fparms[j].param);
+
+			if (in_array(func_table, & n)) {
+				error(
+			_("function `%s': can't use function `%s' as a parameter name"),
+					list[i]->stptr,
+					f->fparms[j].param);
+				result = false;
 			}
 		}
 	}
diff --git a/test/ChangeLog b/test/ChangeLog
index 97b3d40b..8672cb00 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,6 +1,11 @@
+2015-02-01         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* Makefile.am (paramasfunc1, paramasfunc2): Now need --posix.
+	* indirectcall.awk: Restore after code change.
+
 2015-01-30         Arnold D. Robbins     <arnold@skeeve.com>
 
-	* Makefile.in (callparam, paramasfunc1, paramasfunc2): New tests.
+	* Makefile.am (callparam, paramasfunc1, paramasfunc2): New tests.
 	* callparam.awk, callparam.ok: New files.
 	* paramasfunc1.awk, paramasfunc1.ok: New files.
 	* paramasfunc2.awk, paramasfunc2.ok: New files.
diff --git a/test/Makefile.am b/test/Makefile.am
index 4a90beb4..3160494e 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -2011,6 +2011,15 @@ genpot:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk --gen-pot >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+paramasfunc1::
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk --posix >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
+paramasfunc2::
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk --posix >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
 # Targets generated for other tests:
 include Maketests
diff --git a/test/Makefile.in b/test/Makefile.in
index 97171726..d1bbf4f8 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -2447,6 +2447,16 @@ genpot:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk --gen-pot >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
+paramasfunc1::
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk --posix >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
+paramasfunc2::
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk --posix >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 Gt-dummy:
 # file Maketests, generated from Makefile.am by the Gentests program
 addcomma:
@@ -3054,16 +3064,6 @@ opasnslf:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
-paramasfunc1:
-	@echo $@
-	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
-	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
-
-paramasfunc2:
-	@echo $@
-	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
-	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
-
 paramdup:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/Maketests b/test/Maketests
index 41c85c01..f3639b0f 100644
--- a/test/Maketests
+++ b/test/Maketests
@@ -605,16 +605,6 @@ opasnslf:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
-paramasfunc1:
-	@echo $@
-	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
-	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
-
-paramasfunc2:
-	@echo $@
-	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
-	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
-
 paramdup:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/indirectcall.awk b/test/indirectcall.awk
index 74290973..5cfdd235 100644
--- a/test/indirectcall.awk
+++ b/test/indirectcall.awk
@@ -5,13 +5,13 @@
 
 # average --- return the average of the values in fields $first - $last
 
-function average(first, last,	the_sum, i)
+function average(first, last,	sum, i)
 {
-	the_sum = 0;
+	sum = 0;
 	for (i = first; i <= last; i++)
-		the_sum += $i
+		sum += $i
 
-	return the_sum / (last - first + 1)
+	return sum / (last - first + 1)
 }
 
 # sum --- return the average of the values in fields $first - $last