[PATCH v2] Replace mkproto.pl with mkproto.awk

[Ethan Sommer]

This replaces the build dependency on perl with one on awk which is
already used throughout the build system and is much more ubiquitous
than perl
---
 Makefile.in |  2 +-
 mkproto.awk | 39 +++++++++++++++++++++++++++++++++++++++
 mkproto.pl  | 48 ------------------------------------------------
 3 files changed, 40 insertions(+), 49 deletions(-)
 create mode 100644 mkproto.awk
 delete mode 100644 mkproto.pl

diff --git a/Makefile.in b/Makefile.in
index f912f312..d7ddbc41 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -210,7 +210,7 @@ proto.h: proto.h-tstamp
 	@if test -f proto.h; then :; else cp -p $(srcdir)/proto.h .; fi
 
 proto.h-tstamp: $(srcdir)/*.c $(srcdir)/lib/compat.c config.h
-	perl $(srcdir)/mkproto.pl $(srcdir)/*.c $(srcdir)/lib/compat.c
+	awk -f $(srcdir)/mkproto.awk $(srcdir)/*.c $(srcdir)/lib/compat.c
 
 man: rsync.1 rsyncd.conf.5 man-copy
 
diff --git a/mkproto.awk b/mkproto.awk
new file mode 100644
index 00000000..d3802f95
--- /dev/null
+++ b/mkproto.awk
@@ -0,0 +1,39 @@
+#!/usr/bin/awk -f
+
+BEGIN {
+    while ((getline i < "proto.h") > 0) old_protos = old_protos ? old_protos "\n" i : i
+    protos = "/* This file is automatically generated with \"make proto\". DO NOT EDIT */\n"
+}
+
+inheader {
+    protos = protos "\n" ((inheader = /\)[ \t]*$/ ? 0 : 1) ? $0 : $0 ";")
+    next
+}
+
+/^FN_(LOCAL|GLOBAL)_[^(]+\([^,()]+/ {
+    local = /^FN_LOCAL/
+    gsub(/^FN_(LOC|GLOB)AL_|,.*$/, "")
+    sub(/^BOOL\(/, "BOOL ")
+    sub(/^CHAR\(/, "char ")
+    sub(/^INTEGER\(/, "int ")
+    sub(/^STRING\(/, "char *")
+    protos = protos "\n" $0 (local ? "(int module_id);" : "(void);")
+    next
+}
+
+/^static|^extern|;/||!/^[A-Za-z][A-Za-z0-9_]* / { next }
+
+/\(.*\)[ \t]*$/ {
+    protos = protos "\n" $0 ";"
+    next
+}
+
+/\(/ {
+    inheader = 1
+    protos = protos "\n" $0
+}
+
+END {
+    if (old_protos != protos) print protos > "proto.h"
+    print "" > "proto.h-tstamp"
+}
diff --git a/mkproto.pl b/mkproto.pl
deleted file mode 100644
index cdeb2ea3..00000000
--- a/mkproto.pl
+++ /dev/null
@@ -1,48 +0,0 @@
-# generate prototypes for rsync
-
-$old_protos = '';
-if (open(IN, 'proto.h')) {
-    $old_protos = join('', <IN>);
-    close IN;
-}
-
-%FN_MAP = (
-    BOOL => 'BOOL ',
-    CHAR => 'char ',
-    INTEGER => 'int ',
-    STRING => 'char *',
-);
-
-$inheader = 0;
-$protos = qq|/* This file is automatically generated with "make proto". DO NOT EDIT */\n\n|;
-
-while (<>) {
-    if ($inheader) {
-	if (/[)][ \t]*$/) {
-	    $inheader = 0;
-	    s/$/;/;
-	}
-	$protos .= $_;
-    } elsif (/^FN_(LOCAL|GLOBAL)_([^(]+)\(([^,()]+)/) {
-	$ret = $FN_MAP{$2};
-	$func = $3;
-	$arg = $1 eq 'LOCAL' ? 'int module_id' : 'void';
-	$protos .= "$ret$func($arg);\n";
-    } elsif (/^static|^extern/ || /[;]/ || !/^[A-Za-z][A-Za-z0-9_]* /) {
-	;
-    } elsif (/[(].*[)][ \t]*$/) {
-	s/$/;/;
-	$protos .= $_;
-    } elsif (/[(]/) {
-	$inheader = 1;
-	$protos .= $_;
-    }
-}
-
-if ($old_protos ne $protos) {
-    open(OUT, '>proto.h') or die $!;
-    print OUT $protos;
-    close OUT;
-}
-
-open(OUT, '>proto.h-tstamp') and close OUT;
-- 
2.23.0