libbb: add strncpy_IFNAMSIZ

function                                             old     new   delta
...
udhcp_read_interface                                 225     220      -5
brctl_main                                          1151    1146      -5
add_interface                                        109     104      -5
ipaddr_list_or_flush                                2174    2167      -7
do_add_ioctl                                          88      80      -8
vconfig_main                                         249     240      -9
do_del_ioctl                                          78      68     -10
do_iplink                                           1186    1173     -13
do_if_fetch                                          766     753     -13
buffer_fill_and_print                                196     179     -17
parse_args                                          1709    1684     -25
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/20 up/down: 11/-140)         Total: -129 bytes

1 files changed, 2 insertions, 2 deletions

diff --git a/networking/brctl.c b/networking/brctl.c
index 847517961..69e3c869c 100644
--- a/networking/brctl.c
+++ b/networking/brctl.c
@@ -137,7 +137,7 @@ int brctl_main(int argc UNUSED_PARAM, char **argv)
 
                                 if (!if_indextoname(bridx[i], brname))
                                         bb_perror_msg_and_die("can't get bridge name for index %d", i);
-                                strncpy(ifr.ifr_name, brname, IFNAMSIZ);
+                                strncpy_IFNAMSIZ(ifr.ifr_name, brname);
 
                                 arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
                                                         (unsigned long) &bi, 0);
@@ -191,7 +191,7 @@ int brctl_main(int argc UNUSED_PARAM, char **argv)
                 if (!*argv) /* all but 'addif/delif' need at least two arguments */
                         bb_show_usage();
 
-                strncpy(ifr.ifr_name, br, IFNAMSIZ);
+                strncpy_IFNAMSIZ(ifr.ifr_name, br);
                 if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
                         brif = *argv;
                         ifr.ifr_ifindex = if_nametoindex(brif);