From 3e27ced0c24be18dc443f7eb1421c7c3c1755cfe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Chv=C3=A1tal?= <tchvatal@suse.com>
Date: Sun, 18 Jun 2017 08:54:17 +0200
Subject: [PATCH 6/7] Allow interface stacking

---
 lib/interface.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/lib/interface.c b/lib/interface.c
index 7e326a0..42d86fb 100644
--- a/lib/interface.c
+++ b/lib/interface.c
@@ -208,10 +208,11 @@ out:
     return err;
 }
 
-static const char *get_name(char *name, const char *p)
+static const char *get_name(char **namep, const char *p)
 {
     while (isspace(*p))
 	p++;
+    char *name = *namep = p;
     while (*p) {
 	if (isspace(*p))
 	    break;
@@ -314,9 +315,10 @@ static int get_dev_fields(const char *bp, struct interface *ife)
 static int if_readlist_proc(const char *target)
 {
     FILE *fh;
-    char buf[512];
     struct interface *ife;
     int err;
+    char *line = NULL;
+    size_t linelen = 0;
 
     fh = fopen(_PATH_PROCNET_DEV, "r");
     if (!fh) {
@@ -324,10 +326,11 @@ static int if_readlist_proc(const char *target)
 			_PATH_PROCNET_DEV, strerror(errno));
 		return -2;
 	}
-    if (fgets(buf, sizeof buf, fh))
-		/* eat line */;
-    if (fgets(buf, sizeof buf, fh))
-		/* eat line */;
+    if (getline(&line, &linelen, fh) == -1 /* eat line */
+	|| getline(&line, &linelen, fh) == -1) {
+		err = -1;
+		goto out;
+    }
 
 #if 0				/* pretty, but can't cope with missing fields */
     fmt = proc_gen_fmt(_PATH_PROCNET_DEV, 1, fh,
@@ -352,14 +355,14 @@ static int if_readlist_proc(const char *target)
     if (!fmt)
 	return -1;
 #else
-    procnetdev_vsn = procnetdev_version(buf);
+    procnetdev_vsn = procnetdev_version(line);
 #endif
 
     err = 0;
-    while (fgets(buf, sizeof buf, fh)) {
+    while (getline(&line, &linelen, fh) != -1) {
 	const char *s;
-	char name[IFNAMSIZ];
-	s = get_name(name, buf);
+	char *name;
+	s = get_name(&name, line);
 	ife = if_cache_add(name);
 	get_dev_fields(s, ife);
 	ife->statistics_valid = 1;
@@ -374,6 +377,8 @@ static int if_readlist_proc(const char *target)
 #if 0
     free(fmt);
 #endif
+  out:
+    free(line);
     fclose(fh);
     return err;
 }
-- 
2.13.1