将当前Mac转换为整数加1后重新转换为Mac，就解决了进位问题

#include <stdio.h>
#include <stdlib.h>
#include <string.h>// 将 MAC 地址转换为整数
unsigned long long mac_to_int(char *mac) {char mac_str[18];strcpy(mac_str, mac);char *ptr = strtok(mac_str, ":");unsigned long long mac_int = 0;while (ptr != NULL) {mac_int = (mac_int << 8) + strtoul(ptr, NULL, 16);ptr = strtok(NULL, ":");}return mac_int;
}// 将整数转换为 MAC 地址
void int_to_mac(unsigned long long mac_int, char *mac) {sprintf(mac, "%02llX:%02llX:%02llX:%02llX:%02llX:%02llX",(mac_int >> 40) & 0xFF, (mac_int >> 32) & 0xFF, (mac_int >> 24) & 0xFF,(mac_int >> 16) & 0xFF, (mac_int >> 8) & 0xFF, mac_int & 0xFF);
}int main() {char current_mac[] = "00:11:22:33:44:55";unsigned long long mac_int = mac_to_int(current_mac);mac_int += 1;char new_mac[18];int_to_mac(mac_int, new_mac);printf("当前 MAC 地址：%s\\n", current_mac);printf("加1后的 MAC 地址：%s\\n", new_mac);return 0;
}

情形2

#include <stdio.h>
#include <stdint.h>typedef uint8_t u8;// 将 MAC 地址转换为整数
uint64_t mac_to_int(u8 source_mac[6]) {uint64_t mac_int = 0;for (int i = 0; i < 6; i++) {mac_int = (mac_int << 8) + source_mac[i];}return mac_int;
}// 将整数转换为 MAC 地址
void int_to_mac(uint64_t mac_int, u8 dest_mac[6]) {for (int i = 5; i >= 0; i--) {dest_mac[i] = mac_int & 0xFF;mac_int >>= 8;}
}int main() {u8 source_mac[6] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55};uint64_t mac_int = mac_to_int(source_mac);mac_int += 1;u8 new_mac[6];int_to_mac(mac_int, new_mac);printf("当前 MAC 地址：");for (int i = 0; i < 6; i++) {printf("%02X:", source_mac[i]);}printf("\\n");printf("加1后的 MAC 地址：");for (int i = 0; i < 6; i++) {printf("%02X:", new_mac[i]);}printf("\\n");return 0;
}