/usr/bin/gpscat is in python-gps 3.9-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | #! /usr/bin/python
#
# This file is Copyright (c) 2010 by the GPSD project
# BSD terms apply: see the file COPYING in the distribution root for details.
#
# Display GPS output. Hexify it if necessary.
#
import os, sys, termios, socket, select, getopt, curses.ascii
import gps.packet as sniffer
# The spec says 82, but some receivers (TN-200, GSW 2.3.2) output 86 characters
NMEA_MAX = 86
# Lowest debug level at which packet getter begins to emit messages, minus one
BASELEVEL = sniffer.LOG_IO
highhalf_latch = True
def hexdump(str):
dmp = ""
for (i, ch) in enumerate(str):
if curses.ascii.isprint(ord(ch)) or curses.ascii.isspace(ord(ch)):
dmp += ch
else:
dmp += "\\x%02x" % ord(ch)
return dmp
debuglevel = 0
def reporter(errlevel, msg):
if errlevel <= debuglevel:
sys.stdout.write(msg)
def printusage():
sys.stderr.write("usage: gpscat [-s speed] [-p] [-t] [-D debuglevel] serial-port\n")
if __name__ == '__main__':
buf = ""
try:
try:
(options, arguments) = getopt.getopt(sys.argv[1:], "hps:tD:V")
except getopt.GetoptError, msg:
print "gpscat: " + str(msg)
raise SystemExit, 1
speed = None
parity = None
stopbits = None
rawmode = True
typeflag = False
for (switch, val) in options:
if switch == '-p':
rawmode = False
elif switch == '-s':
if val[-2] in ('N', 'E', 'O'):
parity = val[-2]
stopbits = int(val[-1])
val = val[:-2]
speed = int(val)
elif switch == '-t':
typeflag = True
rawmode = False
elif switch == '-D':
debuglevel = BASELEVEL + int(val)
elif switch == '-h':
printusage()
raise SystemExit, 0
if (len(arguments) != 1):
printusage()
raise SystemExit, 1
if "rfcomm" in arguments[0]: # Bluetooth special case
s = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_STREAM, socket.BTPROTO_RFCOMM)
s.connect((arguments[0], 1))
tty = s.fileno()
else: # Ordinary device
tty = os.open(arguments[0], os.O_RDWR)
if speed != None:
(iflag, oflag, cflag, lflag, ispeed, ospeed, cc) = termios.tcgetattr(tty)
try:
ispeed = ospeed = eval("termios.B%d" % speed)
except AttributeError:
sys.stderr.write("gpscat: unknown baud rate %d\n" % speed)
raise SystemExit, 1
if stopbits:
cflag &= ~termios.CSIZE
cflag |= (termios.CS8, termios.CS7)[stopbits-1]
if parity:
if parity == 'N':
iflag &= ~termios.PARENB
iflag &= ~termios.INPCK
elif parity == 'O':
iflag |= termios.INPCK
cflag |= termios.PARENB
cflag |= termios.PARODD
elif parity == 'E':
iflag |= termios.INPCK
cflag |= termios.PARENB
cflag &= ~termios.PARODD
termios.tcsetattr(tty, termios.TCSANOW,
[iflag, oflag, cflag, lflag, ispeed, ospeed, cc])
poller = select.poll()
poller.register(tty, select.POLLIN)
buf = ""
if not rawmode:
getter = sniffer.new()
sniffer.register_report(reporter)
seqno = 0
while True:
(fd, event) = poller.poll()[0]
if fd == tty and event == select.POLLIN:
if rawmode:
buf += os.read(tty, NMEA_MAX)
sys.stdout.write(hexdump(buf))
buf = ""
else:
(length, ptype, packet, counter) = getter.get(tty)
seqno += 1
if length == 0:
break
if typeflag:
sys.stdout.write(`ptype` + " (" + `length` + "@" + `counter-length` + "): " + hexdump(packet))
sys.stdout.write("\n")
else:
sys.stdout.write(hexdump(packet) + "\n")
except KeyboardInterrupt:
if rawmode:
sys.stdout.write("\n")
raise SystemExit, 0
# Local variables:
# mode: python
# end:
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