/*
 * 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_ */