src/libsystemd-network/network-common.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "format-util.h"
   4 #include "network-common.h"
   5 #include "string-util.h"
   6
   7 const char *get_ifname(int ifindex, char **ifname) {
   8         char buf[IF_NAMESIZE + 1];
   9
  10         assert(ifname);
  11
  12         /* This sets ifname only when it is not set yet. */
  13
  14         if (*ifname)
  15                 return *ifname;
  16
  17         if (ifindex <= 0)
  18                 return NULL;
  19
  20         if (!format_ifname(ifindex, buf))
  21                 return NULL;
  22
  23         return *ifname = strdup(buf);
  24 }