Create error reporting sources for GNU Mailutils

+# generr.awk -- Create error reporting sources for GNU Mailutils
+# Copyright (C) 2005 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2, or (at
+# your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc.
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+# This program creates error reporting source files (muerrno.c and errno.h)
+# for GNU Mailutils.
+#
+# Usage:
+#      awk -f generr.awk errors muerrno.cin > muerrno.c
+#      awk -f generr.awk errors muerrno.hin > errno.h
+
+BEGIN {
+  defno = 0
+}
+
+ARGIND == 1 && /^ *#/ { next }
+ARGIND == 1 && NF == 0 { next }
+ARGIND == 1 {
+  def[defno] = $1
+  match(substr($0,length($1)), "[ \\t]+")
+  text[defno] = substr($0,length($1)+RLENGTH+1)
+  defno++
+}
+
+ARGIND == 2 && /\$AUTOWARN/ {
+  match($0,"\\$AUTOWARN");
+  print substr($0,1,RSTART-1) "This file is generated automatically. Please, do not edit." substr($0,RSTART+RLENGTH)
+  next
+}
+
+ARGIND == 2 && $1 == "$MESSAGE_STRINGS" {
+  match($0, "[ \\t]+")
+  for (i = 0; i < defno; i++) {
+    printf "%*.*scase %s:\n", RLENGTH, RLENGTH, "", def[i]
+    printf "%*.*sreturn _(\"%s\");\n\n", RLENGTH+2,RLENGTH+2,"", text[i] 
+  }
+  next
+}
+
+ARGIND == 2 && $1 == "$MESSAGE_CODES" {
+  match($0, "[ \\t]+")
+  for (i = 0; i < defno; i++) {
+    printf "%*.*scase %s:\n", RLENGTH, RLENGTH, "", def[i]
+    printf "%*.*sreturn \"%s\";\n\n", RLENGTH+2,RLENGTH+2,"", def[i] 
+  }
+  next
+}
+
+ARGIND == 2 && $1 == "$MESSAGE_DEFS" {
+  for (i = 0; i < defno; i++) {
+    print "#define " def[i] " (MU_ERR_BASE+" i ")"
+  }
+  next
+}
+
+ARGIND == 2 {
+  print
+}
+
+# End of generr.awk