1 files changed, 45 insertions, 0 deletions
diff --git a/lib/util/getsubopt.c b/lib/util/getsubopt.c
new file mode 100644
index 0000000..5cf19d1
--- /dev/null
+++ b/lib/util/getsubopt.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * getsubopt.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "util/compat.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef HAVE_GETSUBOPT
+int getsubopt(char **opt, char *const *keys, char **val)
+{
+	char *str = *opt;
+	size_t i, len;
+
+	*val = NULL;
+	*opt = strchr(str, ',');
+
+	if (*opt == NULL) {
+		*opt = str + strlen(str);
+	} else {
+		*(*opt)++ = '\0';
+	}
+
+	for (i = 0; keys[i]; ++i) {
+		len = strlen(keys[i]);
+
+		if (strncmp(keys[i], str, len) != 0)
+			continue;
+
+		if (str[len] != '=' && str[len] != '\0')
+			continue;
+
+		if (str[len] == '=')
+			*val = str + len + 1;
+
+		return i;
+	}
+
+	return -1;
+}
+#endif