[Contribs] Add README, license text, and invert error code dictionaries.

contrib/errcode/build_errcodedb.py

@@ -1,4 +1,19 @@
 #!/usr/bin/env python
+# Copyright (C) 2008 Stefan Hajnoczi <stefanha@gmail.com>.
+#
+# This program 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 of the
+# License, or 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 import sys
 import re
 
@@ -15,6 +30,15 @@ def err(msg):
     sys.stderr.write('%s: %s\n' % (sys.argv[0], msg))
     sys.exit(1)
 
+def to_pxenv_status(errno):
+    return errno & 0xff
+
+def to_errfile(errno):
+    return (errno >> 13) & 0x7ff
+
+def to_posix_errno(errno):
+    return (errno >> 24) & 0x7f
+
 def load_header_file(filename, regexp):
     defines = {}
     for line in open(filename, 'r'):
@@ -42,7 +66,7 @@ def evaluate(defines, expr):
         err('invalid expression')
     return eval(pyexpr)
 
-def build(filenames, regexp):
+def build(filenames, regexp, selector):
     unevaluated = {}
     for filename in filenames:
         unevaluated.update(load_header_file(filename, regexp))
@@ -59,8 +83,12 @@ def build(filenames, regexp):
                 changed = True
     if unevaluated:
         err('unable to evaluate all #defines')
-    return evaluated
 
-print 'pxenv_status =', repr(build(pxenv_status_files, PXENV_STATUS_RE))
-print 'errfile =', repr(build(errfile_files, ERRFILE_RE))
-print 'posix_errno =', repr(build(posix_errno_files, POSIX_ERRNO_RE))
+    lookup = {}
+    for key, val in evaluated.iteritems():
+        lookup[selector(val)] = key
+    return lookup
+
+print 'pxenv_status =', repr(build(pxenv_status_files, PXENV_STATUS_RE, to_pxenv_status))
+print 'errfile =', repr(build(errfile_files, ERRFILE_RE, to_errfile))
+print 'posix_errno =', repr(build(posix_errno_files, POSIX_ERRNO_RE, to_posix_errno))