iproute: more string reuse

   text	   data	    bss	    dec	    hex	filename
 936892	    932	  17676	 955500	  e946c	busybox_old
 936843	    932	  17676	 955451	  e943b	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/libiproute/rt_names.c

@@ -28,8 +28,11 @@ typedef struct rtnl_tab_t {
 static void rtnl_tab_initialize(const char *file, const char **tab)
 {
 	char *token[2];
-	parser_t *parser = config_open2(file, fopen_for_read);
+	char fullname[sizeof(CONFDIR"/rt_dsfield") + 8];
+	parser_t *parser;
 
+	sprintf(fullname, CONFDIR"/rt_%s", file);
+	parser = config_open2(fullname, fopen_for_read);
 	while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) {
 		unsigned id = bb_strtou(token[0], NULL, 0);
 		if (id > RT_TABLE_MAX) {
@@ -94,7 +97,7 @@ static void rtnl_rtprot_initialize(void)
 		return;
 	rtnl_rtprot_tab = xzalloc(sizeof(*rtnl_rtprot_tab));
 	memcpy(rtnl_rtprot_tab->tab, init_tab, sizeof(init_tab));
-	rtnl_tab_initialize(CONFDIR "/rt_protos", rtnl_rtprot_tab->tab);
+	rtnl_tab_initialize("protos", rtnl_rtprot_tab->tab);
 }
 
 #if 0 /* UNUSED */
@@ -131,7 +134,7 @@ static void rtnl_rtscope_initialize(void)
 	rtnl_rtscope_tab->tab[254] = "host";
 	rtnl_rtscope_tab->tab[253] = "link";
 	rtnl_rtscope_tab->tab[200] = "site";
-	rtnl_tab_initialize(CONFDIR "/rt_scopes", rtnl_rtscope_tab->tab);
+	rtnl_tab_initialize("scopes", rtnl_rtscope_tab->tab);
 }
 
 const char* FAST_FUNC rtnl_rtscope_n2a(int id)
@@ -161,7 +164,7 @@ static void rtnl_rtrealm_initialize(void)
 	if (rtnl_rtrealm_tab) return;
 	rtnl_rtrealm_tab = xzalloc(sizeof(*rtnl_rtrealm_tab));
 	rtnl_rtrealm_tab->tab[0] = "unknown";
-	rtnl_tab_initialize(CONFDIR "/rt_realms", rtnl_rtrealm_tab->tab);
+	rtnl_tab_initialize("realms", rtnl_rtrealm_tab->tab);
 }
 
 int FAST_FUNC rtnl_rtrealm_a2n(uint32_t *id, char *arg)
@@ -193,7 +196,7 @@ static void rtnl_rtdsfield_initialize(void)
 	if (rtnl_rtdsfield_tab) return;
 	rtnl_rtdsfield_tab = xzalloc(sizeof(*rtnl_rtdsfield_tab));
 	rtnl_rtdsfield_tab->tab[0] = "0";
-	rtnl_tab_initialize(CONFDIR "/rt_dsfield", rtnl_rtdsfield_tab->tab);
+	rtnl_tab_initialize("dsfield", rtnl_rtdsfield_tab->tab);
 }
 
 const char* FAST_FUNC rtnl_dsfield_n2a(int id)
@@ -229,7 +232,7 @@ static void rtnl_rttable_initialize(void)
 	rtnl_rttable_tab->tab[255] = "local";
 	rtnl_rttable_tab->tab[254] = "main";
 	rtnl_rttable_tab->tab[253] = "default";
-	rtnl_tab_initialize(CONFDIR "/rt_tables", rtnl_rttable_tab->tab);
+	rtnl_tab_initialize("tables", rtnl_rttable_tab->tab);
 }
 
 const char* FAST_FUNC rtnl_rttable_n2a(int id)