1 files changed, 58 insertions, 58 deletions
diff --git a/Demo/sockets/mcast.py b/Demo/sockets/mcast.py
index 71bcc75..122dad7 100755
--- a/Demo/sockets/mcast.py
+++ b/Demo/sockets/mcast.py
@@ -19,76 +19,76 @@ from socket import *
 
 # Main program
 def main():
-	flags = sys.argv[1:]
-	#
-	if flags:
-		sender(flags[0])
-	else:
-		receiver()
+    flags = sys.argv[1:]
+    #
+    if flags:
+        sender(flags[0])
+    else:
+        receiver()
 
 
 # Sender subroutine (only one per local area network)
 def sender(flag):
-	s = socket(AF_INET, SOCK_DGRAM)
-	if flag == '-b':
-		s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
-		mygroup = '<broadcast>'
-	else:
-		mygroup = MYGROUP
-		ttl = struct.pack('b', 1)		# Time-to-live
-		s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl)
-	while 1:
-		data = repr(time.time())
-##		data = data + (1400 - len(data)) * '\0'
-		s.sendto(data, (mygroup, MYPORT))
-		time.sleep(1)
+    s = socket(AF_INET, SOCK_DGRAM)
+    if flag == '-b':
+        s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
+        mygroup = '<broadcast>'
+    else:
+        mygroup = MYGROUP
+        ttl = struct.pack('b', 1)               # Time-to-live
+        s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl)
+    while 1:
+        data = repr(time.time())
+##              data = data + (1400 - len(data)) * '\0'
+        s.sendto(data, (mygroup, MYPORT))
+        time.sleep(1)
 
 
 # Receiver subroutine (as many as you like)
 def receiver():
-	# Open and initialize the socket
-	s = openmcastsock(MYGROUP, MYPORT)
-	#
-	# Loop, printing any data we receive
-	while 1:
-		data, sender = s.recvfrom(1500)
-		while data[-1:] == '\0': data = data[:-1] # Strip trailing \0's
-		print sender, ':', repr(data)
+    # Open and initialize the socket
+    s = openmcastsock(MYGROUP, MYPORT)
+    #
+    # Loop, printing any data we receive
+    while 1:
+        data, sender = s.recvfrom(1500)
+        while data[-1:] == '\0': data = data[:-1] # Strip trailing \0's
+        print sender, ':', repr(data)
 
 
 # Open a UDP socket, bind it to a port and select a multicast group
 def openmcastsock(group, port):
-	# Import modules used only here
-	import string
-	import struct
-	#
-	# Create a socket
-	s = socket(AF_INET, SOCK_DGRAM)
-	#
-	# Allow multiple copies of this program on one machine
-	# (not strictly needed)
-	s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
-	#
-	# Bind it to the port
-	s.bind(('', port))
-	#
-	# Look up multicast group address in name server
-	# (doesn't hurt if it is already in ddd.ddd.ddd.ddd format)
-	group = gethostbyname(group)
-	#
-	# Construct binary group address
-	bytes = map(int, string.split(group, "."))
-	grpaddr = 0
-	for byte in bytes: grpaddr = (grpaddr << 8) | byte
-	#
-	# Construct struct mreq from grpaddr and ifaddr
-	ifaddr = INADDR_ANY
-	mreq = struct.pack('ll', htonl(grpaddr), htonl(ifaddr))
-	#
-	# Add group membership
-	s.setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, mreq)
-	#
-	return s
+    # Import modules used only here
+    import string
+    import struct
+    #
+    # Create a socket
+    s = socket(AF_INET, SOCK_DGRAM)
+    #
+    # Allow multiple copies of this program on one machine
+    # (not strictly needed)
+    s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
+    #
+    # Bind it to the port
+    s.bind(('', port))
+    #
+    # Look up multicast group address in name server
+    # (doesn't hurt if it is already in ddd.ddd.ddd.ddd format)
+    group = gethostbyname(group)
+    #
+    # Construct binary group address
+    bytes = map(int, string.split(group, "."))
+    grpaddr = 0
+    for byte in bytes: grpaddr = (grpaddr << 8) | byte
+    #
+    # Construct struct mreq from grpaddr and ifaddr
+    ifaddr = INADDR_ANY
+    mreq = struct.pack('ll', htonl(grpaddr), htonl(ifaddr))
+    #
+    # Add group membership
+    s.setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, mreq)
+    #
+    return s
 
 
 main()