1 files changed, 44 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/hex.h b/sys/compat/linuxkpi/common/include/linux/hex.h
new file mode 100644
index 000000000000..7e9f499cfb1b
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/hex.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2022-2026 Bjoern A. Zeeb
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#ifndef	_LINUXKPI_LINUX_HEX_H_
+#define	_LINUXKPI_LINUX_HEX_H_
+
+#include <linux/types.h>
+#include <linux/errno.h>
+
+static inline int
+_h2b(const char c)
+{
+
+	if (c >= '0' && c <= '9')
+		return (c - '0');
+	if (c >= 'a' && c <= 'f')
+		return (10 + c - 'a');
+	if (c >= 'A' && c <= 'F')
+		return (10 + c - 'A');
+	return (-EINVAL);
+}
+
+static inline int
+hex2bin(uint8_t *bindst, const char *hexsrc, size_t binlen)
+{
+	int hi4, lo4;
+
+	while (binlen > 0) {
+		hi4 = _h2b(*hexsrc++);
+		lo4 = _h2b(*hexsrc++);
+		if (hi4 < 0 || lo4 < 0)
+			return (-EINVAL);
+
+		*bindst++ = (hi4 << 4) | lo4;
+		binlen--;
+	}
+
+	return (0);
+}
+
+#endif	/* _LINUXKPI_LINUX_HEX_H_ */