*: s/IF_NAMESIZE/IFNAMSIZ/, regularize its use a bit.

function                                             old     new   delta
strncpy_IFNAMSIZ                                       -      13     +13
set_slave_mtu                                         39      37      -2
set_slave_hwaddr                                      52      50      -2
set_master_hwaddr                                     52      50      -2
set_if_flags                                          40      38      -2
get_if_settings                                      101      98      -3
ifenslave_main                                      1680    1661     -19
vconfig_main                                         306     280     -26
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/7 up/down: 13/-56)            Total: -43 bytes

7 files changed, 47 insertions, 51 deletions

diff --git a/networking/Config.in b/networking/Config.in
index f7f189cd6..fb6988b41 100644
--- a/networking/Config.in
+++ b/networking/Config.in
@@ -576,7 +576,7 @@ config NAMEIF
           Renamed interfaces MUST be in the down state.
           It is possible to use a file (default: /etc/mactab)
           with list of new interface names and MACs.
-          Maximum interface name length: IF_NAMESIZE = 16
+          Maximum interface name length: IFNAMSIZ = 16
           File fields are separated by space or tab.
           File format:
           # Comment
diff --git a/networking/brctl.c b/networking/brctl.c
index bd13878b2..acc789722 100644
--- a/networking/brctl.c
+++ b/networking/brctl.c
@@ -137,7 +137,7 @@ int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv)
 
                                 if (!if_indextoname(bridx[i], brname))
                                         bb_perror_msg_and_die("can't get bridge name for index %d", i);
-                                safe_strncpy(ifr.ifr_name, brname, IFNAMSIZ);
+                                strncpy(ifr.ifr_name, brname, IFNAMSIZ);
 
                                 arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
                                                         (unsigned long) &bi, 0);
@@ -191,7 +191,7 @@ int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv)
                 if (!*argv) /* all but 'addif/delif' need at least two arguments */
                         bb_show_usage();
 
-                safe_strncpy(ifr.ifr_name, br, IFNAMSIZ);
+                strncpy(ifr.ifr_name, br, IFNAMSIZ);
                 if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
                         brif = *argv;
                         ifr.ifr_ifindex = if_nametoindex(brif);
diff --git a/networking/ifconfig.c b/networking/ifconfig.c
index fcbeb2420..9e95533cc 100644
--- a/networking/ifconfig.c
+++ b/networking/ifconfig.c
@@ -315,7 +315,7 @@ int ifconfig_main(int argc, char **argv)
         sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 
         /* get interface name */
-        safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
+        strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
 
         /* Process the remaining arguments. */
         while (*++argv != (char *) NULL) {
diff --git a/networking/ifenslave.c b/networking/ifenslave.c
index b11951758..0aa232028 100644
--- a/networking/ifenslave.c
+++ b/networking/ifenslave.c
@@ -148,6 +148,10 @@ static void change_active(char *master_ifname, char *slave_ifname);
 static int enslave(char *master_ifname, char *slave_ifname);
 static int release(char *master_ifname, char *slave_ifname);
 
+static void strncpy_IFNAMSIZ(char *dst, const char *src)
+{
+        strncpy(dst, src, IFNAMSIZ);
+}
 
 int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ifenslave_main(int argc ATTRIBUTE_UNUSED, char **argv)
@@ -302,7 +306,7 @@ static void get_drv_info(char *master_ifname)
         struct ethtool_drvinfo info;
 
         memset(&ifr, 0, sizeof(ifr));
-        strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname);
         ifr.ifr_data = (caddr_t)&info;
 
         info.cmd = ETHTOOL_GDRVINFO;
@@ -332,8 +336,8 @@ static void change_active(char *master_ifname, char *slave_ifname)
                         slave_ifname);
         }
 
-        strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
-        strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname);
+        strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
         if (ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0
          && ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0
         ) {
@@ -448,8 +452,8 @@ static int enslave(char *master_ifname, char *slave_ifname)
         }
 
         /* Do the real thing */
-        strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
-        strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname);
+        strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
         if (ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0
          && ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0
         ) {
@@ -484,8 +488,8 @@ static int release(char *master_ifname, char *slave_ifname)
                 return 1;
         }
 
-        strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
-        strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname);
+        strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
         if (ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0
          && ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0
         ) {
@@ -508,11 +512,11 @@ static int get_if_settings(char *ifname, struct dev_data *dd)
 {
         int res;
 
-        strncpy(dd->mtu.ifr_name, ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(dd->mtu.ifr_name, ifname);
         res = ioctl(skfd, SIOCGIFMTU, &dd->mtu);
-        strncpy(dd->flags.ifr_name, ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(dd->flags.ifr_name, ifname);
         res |= ioctl(skfd, SIOCGIFFLAGS, &dd->flags);
-        strncpy(dd->hwaddr.ifr_name, ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(dd->hwaddr.ifr_name, ifname);
         res |= ioctl(skfd, SIOCGIFHWADDR, &dd->hwaddr);
 
         return res;
@@ -520,7 +524,7 @@ static int get_if_settings(char *ifname, struct dev_data *dd)
 
 static int get_slave_flags(char *slave_ifname)
 {
-        strncpy(slave.flags.ifr_name, slave_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(slave.flags.ifr_name, slave_ifname);
         return ioctl(skfd, SIOCGIFFLAGS, &slave.flags);
 }
 
@@ -528,7 +532,7 @@ static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
 {
         struct ifreq ifr;
 
-        strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname);
         memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
         return ioctl(skfd, SIOCSIFHWADDR, &ifr);
 }
@@ -537,7 +541,7 @@ static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
 {
         struct ifreq ifr;
 
-        strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, slave_ifname);
         memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
         return ioctl(skfd, SIOCSIFHWADDR, &ifr);
 }
@@ -547,7 +551,7 @@ static int set_slave_mtu(char *slave_ifname, int mtu)
         struct ifreq ifr;
 
         ifr.ifr_mtu = mtu;
-        strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, slave_ifname);
         return ioctl(skfd, SIOCSIFMTU, &ifr);
 }
 
@@ -556,7 +560,7 @@ static int set_if_flags(char *ifname, short flags)
         struct ifreq ifr;
 
         ifr.ifr_flags = flags;
-        strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         return ioctl(skfd, SIOCSIFFLAGS, &ifr);
 }
 
@@ -580,7 +584,7 @@ static int clear_if_addr(char *ifname)
 {
         struct ifreq ifr;
 
-        strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, ifname);
         ifr.ifr_addr.sa_family = AF_INET;
         memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
         return ioctl(skfd, SIOCSIFADDR, &ifr);
@@ -603,7 +607,7 @@ static int set_if_addr(char *master_ifname, char *slave_ifname)
         int i;
 
         for (i = 0; i < ARRAY_SIZE(ifra); i++) {
-                strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
+                strncpy_IFNAMSIZ(ifr.ifr_name, master_ifname);
                 res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
                 if (res < 0) {
                         ifr.ifr_addr.sa_family = AF_INET;
@@ -611,7 +615,7 @@ static int set_if_addr(char *master_ifname, char *slave_ifname)
                                sizeof(ifr.ifr_addr.sa_data));
                 }
 
-                strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
+                strncpy_IFNAMSIZ(ifr.ifr_name, slave_ifname);
                 res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
                 if (res < 0)
                         return res;
diff --git a/networking/interface.c b/networking/interface.c
index 44bd8d3d9..f5c94f1ac 100644
--- a/networking/interface.c
+++ b/networking/interface.c
@@ -321,23 +321,23 @@ struct user_net_device_stats {
 
 struct interface {
         struct interface *next, *prev;
-        char name[IFNAMSIZ];    /* interface name        */
-        short type;                     /* if type               */
-        short flags;            /* various flags         */
-        int metric;                     /* routing metric        */
-        int mtu;                        /* MTU value             */
-        int tx_queue_len;       /* transmit queue length */
-        struct ifmap map;       /* hardware setup        */
-        struct sockaddr addr;   /* IP address            */
-        struct sockaddr dstaddr;        /* P-P IP address        */
-        struct sockaddr broadaddr;      /* IP broadcast address  */
-        struct sockaddr netmask;        /* IP network mask       */
+        char name[IFNAMSIZ];                    /* interface name        */
+        short type;                             /* if type               */
+        short flags;                            /* various flags         */
+        int metric;                             /* routing metric        */
+        int mtu;                                /* MTU value             */
+        int tx_queue_len;                       /* transmit queue length */
+        struct ifmap map;                       /* hardware setup        */
+        struct sockaddr addr;                   /* IP address            */
+        struct sockaddr dstaddr;                /* P-P IP address        */
+        struct sockaddr broadaddr;              /* IP broadcast address  */
+        struct sockaddr netmask;                /* IP network mask       */
         int has_ip;
-        char hwaddr[32];        /* HW address            */
+        char hwaddr[32];                        /* HW address            */
         int statistics_valid;
-        struct user_net_device_stats stats;     /* statistics            */
-        int keepalive;          /* keepalive value for SLIP */
-        int outfill;            /* outfill value for SLIP */
+        struct user_net_device_stats stats;     /* statistics            */
+        int keepalive;                          /* keepalive value for SLIP */
+        int outfill;                            /* outfill value for SLIP */
 };
 
 
@@ -388,7 +388,7 @@ static struct interface *add_interface(char *name)
         }
 
         new = xzalloc(sizeof(*new));
-        safe_strncpy(new->name, name, IFNAMSIZ);
+        strncpy(new->name, name, IFNAMSIZ);
         nextp = ife ? &ife->next : &int_list;
         new->prev = ife;
         new->next = *nextp;
diff --git a/networking/nameif.c b/networking/nameif.c
index afc88917e..f3d333baf 100644
--- a/networking/nameif.c
+++ b/networking/nameif.c
@@ -16,16 +16,11 @@
 #include <netinet/ether.h>
 #include <linux/sockios.h>
 
-/* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
-#ifndef IF_NAMESIZE
-#  ifdef IFNAMSIZ
-#    define IF_NAMESIZE IFNAMSIZ
-#  else
-#    define IF_NAMESIZE 16
-#  endif
+#ifndef IFNAMSIZ
+#define IFNAMSIZ 16
 #endif
 
-/* take from linux/sockios.h */
+/* Taken from linux/sockios.h */
 #define SIOCSIFNAME     0x8923  /* set interface name */
 
 /* Octets in one Ethernet addr, from <linux/if_ether.h> */
@@ -111,7 +106,7 @@ static void nameif_parse_selector(ethtable_t *ch, char *selector)
 static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
 {
         ethtable_t *ch;
-        if (strlen(ifname) >= IF_NAMESIZE)
+        if (strlen(ifname) >= IFNAMSIZ)
                 bb_error_msg_and_die("interface name '%s' too long", ifname);
         ch = xzalloc(sizeof(*ch));
         ch->ifname = xstrdup(ifname);
diff --git a/networking/vconfig.c b/networking/vconfig.c
index 7b6c2fa04..3f12e7609 100644
--- a/networking/vconfig.c
+++ b/networking/vconfig.c
@@ -133,10 +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 {
-                if (strlen(argv[1]) >= IF_NAMESIZE) {
-                        bb_error_msg_and_die("if_name >= %d chars", IF_NAMESIZE);
-                }
-                strcpy(ifr.device1, argv[1]);
+                strncpy(ifr.device1, argv[1], IFNAMSIZ);
                 p = argv[2];
 
                 /* I suppose one could try to combine some of the function calls below,