c - 摆脱 sscanf() 警告

Question

我正在从 stdin 读取 MAC 地址(以标准十六进制表示法，例如 00:11:22:33:44:55)并将它们转换为一个 6 字节变量 hw_addr 作为小数:

u8 hw_addr[6];

scanf("%2x:%2x:%2x:%2x:%2x:%2x", &hw_addr[0], &hw_addr[1], &hw_addr[2], &hw_addr[3], &hw_addr[4], &hw_addr[5]);

唯一的问题是我收到 6 个 scanf 警告:

warning: format '%2x' expects type 'unsigned int *', but argument 3 has type 'u8 *'

.....

有什么方法可以消除这些警告而不浪费每个字段的整数？

Answer 1

根据我的scanf 联机帮助页，

 hh       Indicates that the conversion will be one of dioux or n
          and the next pointer is a pointer to a char (rather than
          int).

所以你想要 "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx"