Merge pull request booksbyus#649 from uDude/master

3 Changes

examples/C/zhelpers.h

@@ -20,7 +20,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-
 #if (!defined (WIN32))
 #   include <sys/time.h>
 #endif
@@ -53,10 +52,9 @@ s_recv (void *socket) {
     int size = zmq_recv (socket, buffer, 255, 0);
     if (size == -1)
         return NULL;
-    if (size > 255)
-        size = 255;
-    buffer [size] = 0;
-    return strdup (buffer);
+    return strndup (buffer, sizeof(buffer) - 1);
+    // remember that the strdup family of functions use malloc/alloc for space for the new string.  It must be manually
+    // freed when you are done with it.  Failure to do so will allow a heap attack.
 }
 
 //  Convert C string to 0MQ string and send to socket