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#!/bin/env python
import sys
import struct
try:
        f=open(sys.argv[1],'rb')
except (IOError,Exception):
    print '''usage:
        scriptname segyfilename
'''
    sys.exit(1)
#skip EBCDIC header
try:
    f.seek(3200)
except Exception:
    print 'Oops! your file is broken..'
#read binary header
binhead = f.read(400)
ns = struct.unpack('>h',binhead[20:22])[0]
if ns < 0:
    print 'file read error'
    sys.exit(1)
#read trace header
while True:
    trchead = f.read(240)
    if trchead == '':
        break
    nav = trchead[224:228]+\
          trchead[228:232]+\
          trchead[200:204]+\
          trchead[204:208]+\
          trchead[60:64]
#define output format
    nl = struct.unpack('>5i',nav)
    print 'QL%-4d%9s%10.2f%10.2f%5s' % (nl[0], nl[1], nl[2]/100.0, nl[3]/100.0, nl[4])
    f.seek(ns*4,1)
f.close()