+/*
+ * treat dfu_alt_info with several interface information
+ * to allow DFU on several device with one command,
+ * the string format is
+ * interface devstring'='alternate list (';' separated)
+ * and each interface separated by '&'
+ */
+int dfu_config_interfaces(char *env)
+{
+ struct dfu_entity *dfu;
+ char *s, *i, *d, *a, *part;
+ int ret = -EINVAL;
+ int n = 1;
+
+ s = env;
+ for (; *s; s++) {
+ if (*s == ';')
+ n++;
+ if (*s == '&')
+ n++;
+ }
+ ret = dfu_alt_init(n, &dfu);
+ if (ret)
+ return ret;
+
+ s = env;
+ while (s) {
+ ret = -EINVAL;
+ i = strsep(&s, " ");
+ if (!i)
+ break;
+ d = strsep(&s, "=");
+ if (!d)
+ break;
+ a = strsep(&s, "&");
+ if (!a)
+ a = s;
+ do {
+ part = strsep(&a, ";");
+ ret = dfu_alt_add(dfu, i, d, part);
+ if (ret)
+ return ret;
+ } while (a);
+ }
+
+ return ret;
+}
+