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#!/usr/bin/env python3
"""\
This script decodes hex floats (e.g., in dmesg) into real floats. In the
future maybe it will do other emc2-specific dmesg decoding.
Usage:
dmesg | decode_dmesg
cat /var/log/kern.log | decode_dmesg > output.txt
"""
import re
import sys
def repl(m):
s, w, f, e = m.group("s", "w", "f", "e")
f = f or "0"
v = long(w, 16) + long(f, 16) * (16 ** -len(f))
try:
v *= 2.0**long(e)
except OverflowError:
v = float("inf")
if s: v = -v
return "%g" % v
pat = re.compile('(?i)(?P<s>-?)0[xX]'
'(?P<w>[0-9A-Fa-f])'
'(\\.(?P<f>[0-9A-Fa-f]*))?[Pp](?P<e>[+-]?[0-9]+)')
for line in sys.stdin:
line = pat.sub(repl, line)
sys.stdout.write(line)
# Copyright 2010 Jeff Epler <jepler@unpythonic.net>
#
# 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
# (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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