+int config_parse_dhcp_user_class(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char ***l = data;
+ int r;
+
+ assert(l);
+ assert(lvalue);
+ assert(rvalue);
+
+ if (isempty(rvalue)) {
+ *l = strv_free(*l);
+ return 0;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *w = NULL;
+
+ r = extract_first_word(&rvalue, &w, NULL, 0);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to split user classes option, ignoring: %s", rvalue);
+ break;
+ }
+ if (r == 0)
+ break;
+
+ if (strlen(w) > 255) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "%s length is not in the range 1-255, ignoring.", w);
+ continue;
+ }
+
+ r = strv_push(l, w);
+ if (r < 0)
+ return log_oom();
+
+ w = NULL;
+ }
+
+ return 0;
+}
+