/usr/bin/gpscat is in python-gps 3.17-5.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | #! /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.
#
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
from __future__ import absolute_import, print_function, division
import getopt
import os
import select
import socket
import sys
import termios
import curses.ascii
import gps.packet as sniffer
# The spec says 82, but some receivers (TN-200, GSW 2.3.2) output 86 characters
# the Skyrtaq S2525F8 emits 100 chars
NMEA_MAX = 102
# Lowest debug level at which packet getter begins to emit messages, minus one
BASELEVEL = sniffer.LOG_IO
highhalf_latch = True
def hexdump(st):
dmp = ""
for ch in bytearray(st): # bytearray gets array of ints in Python 2 and 3
if curses.ascii.isprint(ch) or curses.ascii.isspace(ch):
dmp += chr(ch)
else:
dmp += "\\x%02x" % 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__':
try:
try:
(options, arguments) = getopt.getopt(sys.argv[1:], "hps:tD:V")
except getopt.GetoptError as 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 is not 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])
if not rawmode:
getter = sniffer.new()
sniffer.register_report(reporter)
seqno = 0
while True:
rlist, wlist, xlist = select.select([tty], [], [])
if rlist == [tty]:
if rawmode:
buf = os.read(tty, NMEA_MAX)
if not buf:
break
sys.stdout.write(hexdump(buf))
else:
(length, ptype, packet, counter) = getter.get(tty)
seqno += 1
if length == 0:
break
if typeflag:
sys.stdout.write(repr(ptype) + " (" + repr(length)
+ "@" + repr(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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