http://ftp.x.org/contrib/applications/xscreensaver-3.19.tar.gz

[xscreensaver] / hacks / sonar.c

diff --git a/hacks/sonar.c b/hacks/sonar.c
index 5f6510ccce553baec7a6674ad8ee3e1785ae84c5..3a8cf468cf668f1ac8b4f0a709a89120bfc5bdf0 100644 (file)
--- a/hacks/sonar.c
+++ b/hacks/sonar.c
@@ -37,7 +37,7 @@
  * software for any purpose.  It is provided "as is" without express or 
  * implied warranty.
  *
- * $Revision: 1.9 $
+ * $Revision: 1.13 $
  *
  * Version 1.0 April 27, 1998.
  * - Initial version
@@ -116,6 +116,10 @@
 #undef MY_MIN
 #define MY_MIN(a,b) ((a)<(b)?(a - 50):(b - 10))
 
+#ifndef LINE_MAX
+# define LINE_MAX 2048
+#endif
+
 /* Frigging icmp */
 
 #if defined(HAVE_ICMP)
@@ -569,12 +573,28 @@ readPingHostsFile(char *fname)
        else
            continue;
 
+        /* Check to see if the addr looks like an addr.  If not, assume
+           the addr is a name and there is no addr.  This way, we can
+           handle files whose lines have "xx.xx.xx.xx hostname" as their
+           first two tokens, and also files that have a hostname as their
+           first token (like .ssh/known_hosts and .rhosts.)
+         */
+        {
+          int i; char c;
+          if (4 != sscanf(addr, "%d.%d.%d.%d%c", &i, &i, &i, &i, &c))
+            {
+              name = addr;
+              addr = NULL;
+            }
+        }
+        printf ("\"%s\" \"%s\"\n", name, addr);
+
        /* Create a new target using first the name then the address */
 
        new = NULL;
        if (name != NULL)
            new = newHost(name);
-       if (new == NULL)
+       if (new == NULL && addr != NULL)
            new = newHost(addr);
 
        /* Add it to the list if we got one */
@@ -680,6 +700,10 @@ subnetHostsList(void)
 
     /* Construct targets for all addresses in this subnet */
 
+    /* #### jwz: actually, this is wrong, since it assumes a
+       netmask of 255.255.255.0.  But I'm not sure how to find
+       the local netmask.
+     */
     for (i = 254; i > 0; i--) {
        sprintf(p, "%d", i);
        new = newHost(address);
@@ -762,8 +786,10 @@ init_ping(void)
 
        /* Unknown source */
 
-       fprintf(stderr, "%s: illegal pingSource: %s\n", progname, src);
-       goto ping_init_error;
+       fprintf(stderr,
+               "%s: pingSource must be `file', `list', or `subnet', not: %s\n",
+                progname, src);
+        exit (1);
     }
 
     /* Make sure there is something to ping */
@@ -982,7 +1008,13 @@ getping(sonar_info *si, ping_info *pi, int ttl)
 
        gettimeofday(&now, (struct timezone *) 0);
        ip = (struct ip *) packet;
+
        iphdrlen = ip->ip_hl << 2;
+        /* On DEC OSF1 4.0, the preceeding line needs to be
+           iphdrlen = (ip->ip_vhl & 0x0F) << 2;
+           but I don't know how to do this portably.  -- jwz.
+         */
+
        icmph = (struct ICMP *) &packet[iphdrlen];
 
        /* Was the packet a reply?? */
@@ -1454,7 +1486,8 @@ DrawBogie(sonar_info *si, int draw, char *name, int degrees,
 
     /* Compute the coordinates of the object */
 
-    distance = (log((double) distance) / 10.0) * si->radius;
+    if (distance != 0)
+      distance = (log((double) distance) / 10.0) * si->radius;
     x = ox + ((double) distance * cos(4.0 * ((double) degrees)/57.29578));
     y = oy - ((double) distance * sin(4.0 * ((double) degrees)/57.29578));