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

19 files changed, 52 insertions, 49 deletions

diff --git a/e2fsprogs/old_e2fsprogs/uuid/gen_uuid.c b/e2fsprogs/old_e2fsprogs/uuid/gen_uuid.c
index 03a9f376a..4310c17db 100644
--- a/e2fsprogs/old_e2fsprogs/uuid/gen_uuid.c
+++ b/e2fsprogs/old_e2fsprogs/uuid/gen_uuid.c
@@ -165,7 +165,7 @@ static int get_node_id(unsigned char *node_id)
         n = ifc.ifc_len;
         for (i = 0; i < n; i+= ifreq_size(*ifrp) ) {
                 ifrp = (struct ifreq *)((char *) ifc.ifc_buf+i);
-                strncpy(ifr.ifr_name, ifrp->ifr_name, IFNAMSIZ);
+                strncpy_IFNAMSIZ(ifr.ifr_name, ifrp->ifr_name);
 #ifdef SIOCGIFHWADDR
                 if (ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)
                         continue;
diff --git a/include/libbb.h b/include/libbb.h
index 77c4c6088..e4ccc7573 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -540,6 +540,7 @@ char *xstrdup(const char *s) FAST_FUNC;
 char *xstrndup(const char *s, int n) FAST_FUNC;
 void overlapping_strcpy(char *dst, const char *src) FAST_FUNC;
 char *safe_strncpy(char *dst, const char *src, size_t size) FAST_FUNC;
+char *strncpy_IFNAMSIZ(char *dst, const char *src) FAST_FUNC;
 /* Guaranteed to NOT be a macro (smallest code). Saves nearly 2k on uclibc.
  * But potentially slow, don't use in one-billion-times loops */
 int bb_putchar(int ch) FAST_FUNC;
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index e2aee136c..f3c3c538c 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -40,6 +40,14 @@ int FAST_FUNC close_on_exec_on(int fd)
         return fcntl(fd, F_SETFD, FD_CLOEXEC);
 }
 
+char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
+{
+#ifndef IFNAMSIZ
+        enum { IFNAMSIZ = 16 };
+#endif
+        return strncpy(dst, src, IFNAMSIZ);
+}
+
 /* Convert unsigned long long value into compact 4-char
  * representation. Examples: "1234", "1.2k", " 27M", "123T"
  * String is not terminated (buf[4] is untouched) */
diff --git a/networking/arping.c b/networking/arping.c
index aba32b869..e4429973b 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -286,7 +286,7 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
                 struct ifreq ifr;
 
                 memset(&ifr, 0, sizeof(ifr));
-                strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name) - 1);
+                strncpy_IFNAMSIZ(ifr.ifr_name, device);
                 /* We use ifr.ifr_name in error msg so that problem
                  * with truncated name will be visible */
                 ioctl_or_perror_and_die(sock_fd, SIOCGIFINDEX, &ifr, err_str, "not found");
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);
diff --git a/networking/ether-wake.c b/networking/ether-wake.c
index a37b6eb79..882429d1a 100644
--- a/networking/ether-wake.c
+++ b/networking/ether-wake.c
@@ -219,7 +219,7 @@ int ether_wake_main(int argc UNUSED_PARAM, char **argv)
         {
                 struct ifreq if_hwaddr;
 
-                strncpy(if_hwaddr.ifr_name, ifname, sizeof(if_hwaddr.ifr_name));
+                strncpy_IFNAMSIZ(if_hwaddr.ifr_name, ifname);
                 ioctl_or_perror_and_die(s, SIOCGIFHWADDR, &if_hwaddr, "SIOCGIFHWADDR on %s failed", ifname);
 
                 memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6);
@@ -255,7 +255,7 @@ int ether_wake_main(int argc UNUSED_PARAM, char **argv)
 #if defined(PF_PACKET)
         {
                 struct ifreq ifr;
-                strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
                 xioctl(s, SIOCGIFINDEX, &ifr);
                 memset(&whereto, 0, sizeof(whereto));
                 whereto.sll_family = AF_PACKET;
diff --git a/networking/ifconfig.c b/networking/ifconfig.c
index e999741d1..22b1682bc 100644
--- a/networking/ifconfig.c
+++ b/networking/ifconfig.c
@@ -313,7 +313,7 @@ int ifconfig_main(int argc, char **argv)
         sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 
         /* get interface name */
-        strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
 
         /* Process the remaining arguments. */
         while (*++argv != (char *) NULL) {
diff --git a/networking/ifenslave.c b/networking/ifenslave.c
index ae9745726..fa226425a 100644
--- a/networking/ifenslave.c
+++ b/networking/ifenslave.c
@@ -140,11 +140,6 @@ struct globals {
 
 /* NOINLINEs are placed where it results in smaller code (gcc 4.3.1) */
 
-static void strncpy_IFNAMSIZ(char *dst, const char *src)
-{
-        strncpy(dst, src, IFNAMSIZ);
-}
-
 static int ioctl_on_skfd(unsigned request, struct ifreq *ifr)
 {
         return ioctl(skfd, request, ifr);
diff --git a/networking/interface.c b/networking/interface.c
index 00174d496..ef187be1a 100644
--- a/networking/interface.c
+++ b/networking/interface.c
@@ -395,7 +395,7 @@ static struct interface *add_interface(char *name)
         }
 
         new = xzalloc(sizeof(*new));
-        strncpy(new->name, name, IFNAMSIZ);
+        strncpy_IFNAMSIZ(new->name, name);
         nextp = ife ? &ife->next : &int_list;
         new->prev = ife;
         new->next = *nextp;
@@ -614,39 +614,39 @@ static int if_fetch(struct interface *ife)
 
         skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0) {
                 close(skfd);
                 return -1;
         }
         ife->flags = ifr.ifr_flags;
 
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         memset(ife->hwaddr, 0, 32);
         if (ioctl(skfd, SIOCGIFHWADDR, &ifr) >= 0)
                 memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);
 
         ife->type = ifr.ifr_hwaddr.sa_family;
 
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         ife->metric = 0;
         if (ioctl(skfd, SIOCGIFMETRIC, &ifr) >= 0)
                 ife->metric = ifr.ifr_metric;
 
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         ife->mtu = 0;
         if (ioctl(skfd, SIOCGIFMTU, &ifr) >= 0)
                 ife->mtu = ifr.ifr_mtu;
 
         memset(&ife->map, 0, sizeof(struct ifmap));
 #ifdef SIOCGIFMAP
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         if (ioctl(skfd, SIOCGIFMAP, &ifr) == 0)
                 ife->map = ifr.ifr_map;
 #endif
 
 #ifdef HAVE_TXQUEUELEN
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         ife->tx_queue_len = -1; /* unknown value */
         if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) >= 0)
                 ife->tx_queue_len = ifr.ifr_qlen;
@@ -654,23 +654,23 @@ static int if_fetch(struct interface *ife)
         ife->tx_queue_len = -1; /* unknown value */
 #endif
 
-        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         ifr.ifr_addr.sa_family = AF_INET;
         memset(&ife->addr, 0, sizeof(struct sockaddr));
         if (ioctl(skfd, SIOCGIFADDR, &ifr) == 0) {
                 ife->has_ip = 1;
                 ife->addr = ifr.ifr_addr;
-                strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
                 memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
                 if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) >= 0)
                         ife->dstaddr = ifr.ifr_dstaddr;
 
-                strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
                 memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
                 if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) >= 0)
                         ife->broadaddr = ifr.ifr_broadaddr;
 
-                strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
                 memset(&ife->netmask, 0, sizeof(struct sockaddr));
                 if (ioctl(skfd, SIOCGIFNETMASK, &ifr) >= 0)
                         ife->netmask = ifr.ifr_netmask;
diff --git a/networking/libiproute/ipaddress.c b/networking/libiproute/ipaddress.c
index 288dccae7..fadab6f39 100644
--- a/networking/libiproute/ipaddress.c
+++ b/networking/libiproute/ipaddress.c
@@ -83,7 +83,7 @@ static void print_queuelen(char *name)
                 return;
 
         memset(&ifr, 0, sizeof(ifr));
-        strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, name);
         if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
                 close(s);
                 return;
diff --git a/networking/libiproute/iplink.c b/networking/libiproute/iplink.c
index 8de17bfc6..d3d0338b0 100644
--- a/networking/libiproute/iplink.c
+++ b/networking/libiproute/iplink.c
@@ -41,7 +41,7 @@ static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
         struct ifreq ifr;
         int fd;
 
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
         fd = get_ctl_fd();
         xioctl(fd, SIOCGIFFLAGS, &ifr);
         if ((ifr.ifr_flags ^ flags) & mask) {
@@ -58,8 +58,8 @@ static void do_changename(char *dev, char *newdev)
         struct ifreq ifr;
         int fd;
 
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
-        strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
+        strncpy_IFNAMSIZ(ifr.ifr_newname, newdev);
         fd = get_ctl_fd();
         xioctl(fd, SIOCSIFNAME, &ifr);
         close(fd);
@@ -73,7 +73,7 @@ static void set_qlen(char *dev, int qlen)
 
         s = get_ctl_fd();
         memset(&ifr, 0, sizeof(ifr));
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
         ifr.ifr_qlen = qlen;
         xioctl(s, SIOCSIFTXQLEN, &ifr);
         close(s);
@@ -87,7 +87,7 @@ static void set_mtu(char *dev, int mtu)
 
         s = get_ctl_fd();
         memset(&ifr, 0, sizeof(ifr));
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
         ifr.ifr_mtu = mtu;
         xioctl(s, SIOCSIFMTU, &ifr);
         close(s);
@@ -104,7 +104,7 @@ static int get_address(char *dev, int *htype)
         s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
 
         memset(&ifr, 0, sizeof(ifr));
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
         xioctl(s, SIOCGIFINDEX, &ifr);
 
         memset(&me, 0, sizeof(me));
@@ -128,7 +128,7 @@ static void parse_address(char *dev, int hatype, int halen, char *lla, struct if
         int alen;
 
         memset(ifr, 0, sizeof(*ifr));
-        strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
+        strncpy_IFNAMSIZ(ifr->ifr_name, dev);
         ifr->ifr_hwaddr.sa_family = hatype;
 
         alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
diff --git a/networking/libiproute/iptunnel.c b/networking/libiproute/iptunnel.c
index 65c27f936..ab4d65bd4 100644
--- a/networking/libiproute/iptunnel.c
+++ b/networking/libiproute/iptunnel.c
@@ -34,7 +34,7 @@ static int do_ioctl_get_ifindex(char *dev)
         struct ifreq ifr;
         int fd;
 
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
         fd = xsocket(AF_INET, SOCK_DGRAM, 0);
         xioctl(fd, SIOCGIFINDEX, &ifr);
         close(fd);
@@ -47,7 +47,7 @@ static int do_ioctl_get_iftype(char *dev)
         int fd;
         int err;
 
-        strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, dev);
         fd = xsocket(AF_INET, SOCK_DGRAM, 0);
         err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
         close(fd);
@@ -73,7 +73,7 @@ static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
         int fd;
         int err;
 
-        strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
         ifr.ifr_ifru.ifru_data = (void*)p;
         fd = xsocket(AF_INET, SOCK_DGRAM, 0);
         err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
@@ -88,9 +88,9 @@ static int do_add_ioctl(int cmd, const char *basedev, struct ip_tunnel_parm *p)
         int fd;
 
         if (cmd == SIOCCHGTUNNEL && p->name[0]) {
-                strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
         } else {
-                strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
         }
         ifr.ifr_ifru.ifru_data = (void*)p;
         fd = xsocket(AF_INET, SOCK_DGRAM, 0);
@@ -114,9 +114,9 @@ static int do_del_ioctl(const char *basedev, struct ip_tunnel_parm *p)
         int fd;
 
         if (p->name[0]) {
-                strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
         } else {
-                strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
         }
         ifr.ifr_ifru.ifru_data = (void*)p;
         fd = xsocket(AF_INET, SOCK_DGRAM, 0);
@@ -148,7 +148,7 @@ static void parse_args(char **argv, int cmd, struct ip_tunnel_parm *p)
         int key;
 
         memset(p, 0, sizeof(*p));
-        memset(&medium, 0, sizeof(medium));
+        medium[0] = '\0';
 
         p->iph.version = 4;
         p->iph.ihl = 5;
@@ -250,7 +250,7 @@ static void parse_args(char **argv, int cmd, struct ip_tunnel_parm *p)
                                 p->iph.saddr = get_addr32(*argv);
                 } else if (key == ARG_dev) {
                         NEXT_ARG();
-                        strncpy(medium, *argv, IFNAMSIZ-1);
+                        strncpy_IFNAMSIZ(medium, *argv);
                 } else if (key == ARG_ttl) {
                         unsigned uval;
                         NEXT_ARG();
@@ -279,7 +279,7 @@ static void parse_args(char **argv, int cmd, struct ip_tunnel_parm *p)
                         }
                         if (p->name[0])
                                 duparg2("name", *argv);
-                        strncpy(p->name, *argv, IFNAMSIZ);
+                        strncpy_IFNAMSIZ(p->name, *argv);
                         if (cmd == SIOCCHGTUNNEL && count == 0) {
                                 struct ip_tunnel_parm old_p;
                                 memset(&old_p, 0, sizeof(old_p));
@@ -324,7 +324,6 @@ static void parse_args(char **argv, int cmd, struct ip_tunnel_parm *p)
         }
 }
 
-
 /* Return value becomes exitcode. It's okay to not return at all */
 static int do_add(int cmd, char **argv)
 {
diff --git a/networking/libiproute/ll_map.c b/networking/libiproute/ll_map.c
index eeae4e252..3412dc763 100644
--- a/networking/libiproute/ll_map.c
+++ b/networking/libiproute/ll_map.c
@@ -176,7 +176,7 @@ int xll_name_to_index(const char *const name)
                 struct ifreq ifr;
                 int tmp;
 
-                strncpy(ifr.ifr_name, name, IFNAMSIZ);
+                strncpy_IFNAMSIZ(ifr.ifr_name, name);
                 ifr.ifr_ifindex = -1;
                 tmp = ioctl(sock_fd, SIOCGIFINDEX, &ifr);
                 close(sock_fd);
diff --git a/networking/nameif.c b/networking/nameif.c
index 75829fac3..4d68c8d63 100644
--- a/networking/nameif.c
+++ b/networking/nameif.c
@@ -177,7 +177,7 @@ int nameif_main(int argc, char **argv)
 
                 /* Find the current interface name and copy it to ifr.ifr_name */
                 memset(&ifr, 0, sizeof(struct ifreq));
-                strncpy(ifr.ifr_name, token[0], sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
 
 #if ENABLE_FEATURE_NAMEIF_EXTENDED
                 /* Check for driver etc. */
diff --git a/networking/route.c b/networking/route.c
index 8778ecd38..5d2540802 100644
--- a/networking/route.c
+++ b/networking/route.c
@@ -423,7 +423,7 @@ static void INET6_setroute(int action, char **args)
         if (devname) {
                 struct ifreq ifr;
                 memset(&ifr, 0, sizeof(ifr));
-                strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, devname);
                 xioctl(skfd, SIOGIFINDEX, &ifr);
                 rt.rtmsg_ifindex = ifr.ifr_ifindex;
         }
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 29cebfa61..5d1baacf5 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -447,7 +447,7 @@ ifaddrlist(struct IFADDRLIST **ipaddrp)
                  * SIOCGIFFLAGS stomps over it because the requests
                  * are returned in a union.)
                  */
-                strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
+                strncpy_IFNAMSIZ(ifr.ifr_name, ifrp->ifr_name);
                 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
                         if (errno == ENXIO)
                                 continue;
diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c
index ea0a2c3a8..857f0a4de 100644
--- a/networking/udhcp/socket.c
+++ b/networking/udhcp/socket.c
@@ -47,7 +47,7 @@ int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t
         fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 
         ifr.ifr_addr.sa_family = AF_INET;
-        strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, interface);
         if (addr) {
                 if (ioctl_or_perror(fd, SIOCGIFADDR, &ifr,
                         "is interface %s up and configured?", interface)
diff --git a/networking/vconfig.c b/networking/vconfig.c
index 3f12e7609..69c729a14 100644
--- a/networking/vconfig.c
+++ b/networking/vconfig.c
@@ -133,7 +133,7 @@ int vconfig_main(int argc, char **argv)
         if (ifr.cmd == SET_VLAN_NAME_TYPE_CMD) { /* set_name_type */
                 ifr.u.name_type = *xfind_str(name_types+1, argv[1]);
         } else {
-                strncpy(ifr.device1, argv[1], IFNAMSIZ);
+                strncpy_IFNAMSIZ(ifr.device1, argv[1]);
                 p = argv[2];
 
                 /* I suppose one could try to combine some of the function calls below,
diff --git a/networking/zcip.c b/networking/zcip.c
index ff9c83dc7..3a349a5af 100644
--- a/networking/zcip.c
+++ b/networking/zcip.c
@@ -268,7 +268,7 @@ int zcip_main(int argc, char **argv)
 
         // get the interface's ethernet address
         //memset(&ifr, 0, sizeof(ifr));
-        strncpy(ifr.ifr_name, argv_intf, sizeof(ifr.ifr_name));
+        strncpy_IFNAMSIZ(ifr.ifr_name, argv_intf);
         xioctl(sock_fd, SIOCGIFHWADDR, &ifr);
         memcpy(&eth_addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);