runtime: don't change string in place

Signed-off-by: Jafar Al-Gharaibeh <[email protected]>

Author: Jafaral

src/runtime/rposix.r

@@ -1259,17 +1259,19 @@ int sock_listen(char *addr, int is_udp_or_listener, int af_fam)
 
 
    if ((s = sock_get(addr)) < 0) {
-     char *p;
+     char *p, fname[BUFSIZ];
 
      /*
       * If the first argument is just a name, it's a unix domain socket.
       * If there's a : then it's host:port except if the host part is
       * empty, it means on any interface.
       */
 
-      if ((p=strrchr(addr, ':')) != NULL) {
+      SAFE_strncpy(fname,addr, sizeof(fname));
+
+      if ((p=strrchr(fname, ':')) != NULL) {
          *p = 0;
-         res0 = uni_getaddrinfo(addr, p+1, is_udp_or_listener == 1, af_fam);
+         res0 = uni_getaddrinfo(fname, p+1, is_udp_or_listener == 1, af_fam);
          *p = ':';
 
          if (!res0)