【字符串处理函数】十六进制字符串转换为十进制数

const static char to_hex[]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};

//十六进制字符串转换为十进制数
static uint8_t hex_str_to_dec_num(const char *str)
{
uint8_t i;
uint8_t count;
uint8_t ret = 0;
for(count = 0;count < 2;count++)
{
for(i = 0; i<16;i++)
{
if(str[count] == to_hex[i])
{
if(count == 0)
{
ret = i*16+ret;
}
else if(count == 1)
{
ret = i + ret;
}
break;
}
}
if(i>=16)
{
return 0;
}
}
return ret;
}