将Hex值转换为字符串

Question

我想在c中将十六进制值转换为字符串。 例如：

a[4] = {0x34, 0x31, 0xF5, 0x43}

需要转换为字符串

b[8] = {3431F543} 

Answer 1

DevSolar的sprintf解决方案简单易用。但我已经提出了更优化的黑客版本。

void convert_hex_4b_to_string(char buf[9], int ar[4])
{
    static const char tbl[] = "0123456789ABCDEF";
    buf[0] = tbl[((unsigned)ar[0] >> 4) & 0x0f];
    buf[1] = tbl[((unsigned)ar[0]) & 0x0f];
    buf[2] = tbl[((unsigned)ar[1] >> 4) & 0x0f];
    buf[3] = tbl[((unsigned)ar[1]) & 0x0f];
    buf[4] = tbl[((unsigned)ar[2] >> 4) & 0x0f];
    buf[5] = tbl[((unsigned)ar[2]) & 0x0f];
    buf[6] = tbl[((unsigned)ar[3] >> 4) & 0x0f];
    buf[7] = tbl[((unsigned)ar[3]) & 0x0f];
    buf[8] = '\0';
}

...假设所有整数都小于0x100。

(live example)