16进制整数转化成字符串

    Linux下gcc没有itoa，项目要用到16位地址转换成字符通过串口发送，只能自己动手

                              

int itoa(int val, char *buf,int size) const//16进制
{
char *p = buf;
char t = '0';
int len = 0;
int slen = size;
while(val > 0 && len < slen) {
t = val % 16;
val -= t;
val /= 16;
if (t > 9) {
*p++ = t- 10 + 'a';
} else {
*p++ = t + '0';
}
++len;
}
for (int i = 0;i < len/2;++i) {
char c = buf[i];
buf[i] = buf[len-1-i];
buf[len-1-i] = c;
}
buf[len] = '\0';
return len;
}