macaddr.h

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#ifndef _MACADDR_H_
#define _MACADDR_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
#include <string.h>
#include "inline.h"

#define MAC_STR_LEN 18

#ifndef PRIx8
#define PRIx8 "x"
#endif

#ifndef SCNx8
#define SCNx8 "hhx"
#endif

#define MAC_ADD_FORMAT_SCN "%02" SCNx8 ":%02" SCNx8 ":%02" SCNx8 ":%02" SCNx8 ":%02" SCNx8 ":%02" SCNx8 ""
#define MAC_ADD_FORMAT_PRI "%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ""

typedef struct __attribute__((packed)) mac_addr_s {
   uint8_t bytes[6];
} mac_addr_t;

INLINE mac_addr_t mac_from_bytes(uint8_t *array)
{
   mac_addr_t tmp;

   memcpy(&tmp.bytes, array, 6);

   return tmp;
}

INLINE int mac_from_str(const char *str, mac_addr_t *addr)
{
   int res = sscanf(str, MAC_ADD_FORMAT_SCN, &addr->bytes[0], &addr->bytes[1], &addr->bytes[2],
                    &addr->bytes[3], &addr->bytes[4], &addr->bytes[5]);
   if (res == 6) {
      return 1;
   } else {
      memset(addr->bytes, 0, 6);
      return 0;
   }
}

INLINE int mac_cmp(const mac_addr_t *addr1, const mac_addr_t *addr2)
{
   return memcmp(addr1->bytes, addr2->bytes, 6);
}

INLINE void mac_to_str(const mac_addr_t *addr, char *str)
{
   if (str != NULL) {
      snprintf(str, MAC_STR_LEN, MAC_ADD_FORMAT_PRI,
               addr->bytes[0], addr->bytes[1], addr->bytes[2],
               addr->bytes[3], addr->bytes[4], addr->bytes[5]);
   }
}

INLINE void mac_to_bytes(const mac_addr_t *addr, uint8_t *array)
{
   memcpy(array, (void *) addr->bytes, 6);
}

#ifdef __cplusplus
}
#endif

#endif