+/* Reset permissions on the device node, before unlinking it to make sure,
+ * that permisions of possible hard links will be removed too.
+ */
+int unlink_secure(const char *filename)
+{
+ int retval;
+
+ retval = chown(filename, 0, 0);
+ if (retval)
+ dbg("chown(%s, 0, 0) failed with error '%s'", filename, strerror(errno));
+
+ retval = chmod(filename, 0000);
+ if (retval)
+ dbg("chmod(%s, 0000) failed with error '%s'", filename, strerror(errno));
+
+ retval = unlink(filename);
+ if (errno == ENOENT)
+ retval = 0;
+
+ if (retval)
+ dbg("unlink(%s) failed with error '%s'", filename, strerror(errno));
+
+ return retval;
+}
+
+int parse_get_pair(char **orig_string, char **left, char **right)
+{
+ char *temp;
+ char *string = *orig_string;
+
+ if (!string)
+ return -ENODEV;
+
+ /* eat any whitespace */
+ while (isspace(*string) || *string == ',')
+ ++string;
+
+ /* split based on '=' */
+ temp = strsep(&string, "=");
+ *left = temp;
+ if (!string)
+ return -ENODEV;
+
+ /* take the right side and strip off the '"' */
+ while (isspace(*string))
+ ++string;
+ if (*string == '"')
+ ++string;
+ else
+ return -ENODEV;
+
+ temp = strsep(&string, "\"");
+ if (!string || *temp == '\0')
+ return -ENODEV;
+ *right = temp;
+ *orig_string = string;
+
+ return 0;
+}
+