mac字符串转hwaddr，支持各种格式

最新推荐文章于 2021-05-13 04:14:20 发布

原创最新推荐文章于 2021-05-13 04:14:20 发布 · 2.1k 阅读

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该博客介绍了一个C语言函数，用于将不同格式的字符串转换为MAC地址。函数`str_to_hwaddr`解析包含破折号、冒号、点或空格分隔的十六进制数，并将它们转化为6字节的硬件地址。博客通过示例展示了如何处理各种输入，如`0.1-0:203040506`、`010...20304050*67`等。

#include <stdio.h>
#include <string.h>
#include <linux/if_ether.h>
#include <ctype.h>
#include <inttypes.h>

static int str_to_hwaddr(uint8_t *hwaddr, const char *str)
{
	char c;
	uint8_t used = 0;
	uint8_t quarter = 0;
	memset(hwaddr, 0, ETH_ALEN);
	while(isspace(*str)) ++str;
	while('\0' != *str) {
		c = *str++;
		switch(c) {
			default :
				if(strchr("-:. ", c)) {
					if(used) {
						++hwaddr;
						used = 0;
					}
					continue;
				}
				return -1;
			case '0' ... '9':
				quarter = c - '0';
				break;
			case 'a' ... 'f':
				quarter = c - 'a' + 10;
				break;
			case 'A' ... 'F':
				quarter = c - 'A' + 10;
				break;
		}
		*hwaddr = ((*hwaddr)<<4) + quarter;
		if(used) ++hwaddr;
		used = !used;
	}
	return 0;
}

static int print_hwaddr(const char *mac)
{
	uint8_t hwaddr[ETH_ALEN];
	str_to_hwaddr(hwaddr, mac);
	fprintf(stdout, "mac: %s, hwaddr: %02X:%02X:%02X:%02X:%02X:%02X\n",
	                 mac,
	                 (uint32_t)hwaddr[0], (uint32_t)hwaddr[1],
	                 (uint32_t)hwaddr[2], (uint32_t)hwaddr[3],
	                 (uint32_t)hwaddr[4], (uint32_t)hwaddr[5]);
	return 0;
}

int main(int argc, char *argv[])
{
	char mac[128];
	strcpy(mac, "0.1-0:203040506");
	print_hwaddr(mac);
	strcpy(mac, "010...20304050*67");
	print_hwaddr(mac);
	strcpy(mac, "a");
	print_hwaddr(mac);
	strcpy(mac, "0123456789aBcDeF");
	print_hwaddr(mac);
	strcpy(mac, "010203040506");
	print_hwaddr(mac);
	return 0;
}