style: formatting clean up

* data/skeletons/d.m4, examples/d/calc.y, src/output.c,
* src/parse-gram.y:
No tab, no trailing spaces.
Reported by syntax-check.

data/skeletons/d.m4

@@ -29,7 +29,7 @@ m4_define([b4_comment], [/* m4_bpatsubst([$1], [
 # ----------------------
 # Join two lists with a comma if necessary.
 m4_define([b4_list2],
-	  [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
+          [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
 
 
 # b4_percent_define_get3(DEF, PRE, POST, NOT)
@@ -37,8 +37,8 @@ m4_define([b4_list2],
 # Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
 # otherwise NOT.
 m4_define([b4_percent_define_get3],
-	  [m4_ifval(m4_quote(b4_percent_define_get([$1])),
-		[$2[]b4_percent_define_get([$1])[]$3], [$4])])
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$2[]b4_percent_define_get([$1])[]$3], [$4])])
 
 
 # b4_flag_value(BOOLEAN-FLAG)
@@ -110,7 +110,7 @@ m4_define([b4_identification],
 m4_define([b4_int_type],
 [m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
        b4_ints_in($@, [-32768], [32767]), [1], [short],
-					       [int])])
+                                               [int])])
 
 # b4_int_type_for(NAME)
 # ---------------------
@@ -253,11 +253,11 @@ m4_define([b4_parse_param], b4_parse_param))
 m4_define([b4_lex_param_decl],
 [m4_ifset([b4_lex_param],
           [b4_remove_comma([$1],
-			   b4_param_decls(b4_lex_param))],
-	  [$1])])
+                           b4_param_decls(b4_lex_param))],
+          [$1])])
 
 m4_define([b4_param_decls],
-	  [m4_map([b4_param_decl], [$@])])
+          [m4_map([b4_param_decl], [$@])])
 m4_define([b4_param_decl], [, $1])
 
 m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
@@ -270,8 +270,8 @@ m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
 m4_define([b4_parse_param_decl],
 [m4_ifset([b4_parse_param],
           [b4_remove_comma([$1],
-			   b4_param_decls(b4_parse_param))],
-	  [$1])])
+                           b4_param_decls(b4_parse_param))],
+          [$1])])
 
 
 
@@ -280,11 +280,11 @@ m4_define([b4_parse_param_decl],
 # Delegating the lexer parameters to the lexer constructor.
 m4_define([b4_lex_param_call],
           [m4_ifset([b4_lex_param],
-	            [b4_remove_comma([$1],
-				     b4_param_calls(b4_lex_param))],
-	            [$1])])
+                    [b4_remove_comma([$1],
+                                     b4_param_calls(b4_lex_param))],
+                    [$1])])
 m4_define([b4_param_calls],
-	  [m4_map([b4_param_call], [$@])])
+          [m4_map([b4_param_call], [$@])])
 m4_define([b4_param_call], [, $2])
 
 
@@ -294,13 +294,13 @@ m4_define([b4_param_call], [, $2])
 # Extra initialisations of the constructor.
 m4_define([b4_parse_param_cons],
           [m4_ifset([b4_parse_param],
-		    [b4_constructor_calls(b4_parse_param)])])
+                    [b4_constructor_calls(b4_parse_param)])])
 
 m4_define([b4_constructor_calls],
-	  [m4_map([b4_constructor_call], [$@])])
+          [m4_map([b4_constructor_call], [$@])])
 m4_define([b4_constructor_call],
-	  [this.$2 = $2;
-	  ])
+          [this.$2 = $2;
+          ])
 
 
 
@@ -309,12 +309,12 @@ m4_define([b4_constructor_call],
 # Extra instance variables.
 m4_define([b4_parse_param_vars],
           [m4_ifset([b4_parse_param],
-		    [
+                    [
     /* User arguments.  */
 b4_var_decls(b4_parse_param)])])
 
 m4_define([b4_var_decls],
-	  [m4_map_sep([b4_var_decl], [
+          [m4_map_sep([b4_var_decl], [
 ], [$@])])
 m4_define([b4_var_decl],
-	  [    protected $1;])
+          [    protected $1;])

examples/d/calc.y

@@ -156,4 +156,3 @@ void main ()
   Calc p = new Calc (l);
   p.parse ();
 }
-

src/output.c

@@ -236,7 +236,7 @@ prepare_rules (void)
       prhs[r] = i;
       /* RHS of the rule R. */
       for (item_number *rhsp = rules[r].rhs; 0 <= *rhsp; ++rhsp)
-	rhs[i++] = *rhsp;
+        rhs[i++] = *rhsp;
       /* Separator in RHS. */
       rhs[i++] = -1;
 
@@ -245,7 +245,7 @@ prepare_rules (void)
       /* LHS of the rule R. */
       r1[r] = rules[r].lhs->number;
       /* Length of rule R's RHS. */
-      r2[r] = rule_rhs_length(&rules[r]);
+      r2[r] = rule_rhs_length (&rules[r]);
       /* Dynamic precedence (GLR).  */
       dprec[r] = rules[r].dprec;
       /* Merger-function index (GLR).  */

src/parse-gram.y

@@ -462,7 +462,7 @@ tag:
 `-----------------------*/
 
 // A non empty list of possibly tagged symbols for %nterm.
-// 
+//
 // Can easily be defined like symbol_decls but restricted to ID, but
 // using token_decls allows to reudce the number of rules, and also to
 // make nicer error messages on "%nterm 'a'" or '%nterm FOO "foo"'.