+static int read_and_strip_hostname(const char *path, char **hn) {
+ char *s, *k;
+ int r;
+
+ assert(path);
+ assert(hn);
+
+ if ((r = read_one_line_file(path, &s)) < 0)
+ return r;
+
+ k = strdup(strstrip(s));
+ free(s);
+
+ if (!k)
+ return -ENOMEM;
+
+ strip_bad_chars(k);
+
+ if (k[0] == 0) {
+ free(k);
+ return -ENOENT;
+ }
+
+ *hn = k;
+
+ return 0;
+}
+