/**
* Determine if this is or is not a credit card number.
* Return 1 if it is, 0 if it is not.
* buf[-WINDOW_MARGIN] must be accessible.
* buf[len+WINDOW_MARGIN] must be accessible
*/
bool valid_ccn(const char *buf,int buflen)
{
/* Make the digits array */
if(buflen>19) RETURN(0,"Too long");
char digits[20]; // just the digits
memset(digits,0,sizeof(digits));
if(extract_digits_and_test(buf,buflen,digits)) RETURN(0,"failed nondigit count");
if(prefix_test(digits)) RETURN(0,"failed prefix test");
if(ccv1_test(digits)) RETURN(0,"failed ccv1 test");
if(pattern_test(digits)) RETURN(0,"failed pattern test");
if(histogram_test(digits)) RETURN(0,"failed histogram test");
int before_window = 4; // what we care about before
int after_window = 4; // what we care about before
/* If the 4 characters before or after are hex digits but not decimal digits,
* then this is probably not a credit card number.
* We're probably instead in a sea of hex. So abort.
*/
if(only_hex_digits(buf-before_window,before_window) && !only_dec_digits(buf-before_window,before_window)){
RETURN(0,"failed before hex test");
}
if(only_hex_digits(buf+buflen,after_window) && !only_dec_digits(buf+buflen,after_window)){
RETURN(0,"failed after hex test");
}
return 1;
}
static ssize_t set_test_pattern(struct device *dev, struct device_attribute *attr, const char *buf, size_t size)
{
ssize_t ret = -EINVAL;
int test;
if(sscanf(buf, "%d",&test) !=1){
printk("[PMIC K-PJT] bad arguments ");
}
ret = size;
pattern_test(test);
return ret;
}
static int validate_ccn_debug(const char *buf,int buflen)
{
char digits[64];
printf("running tests. 0 means passed, -1 means failed.\n\n");
printf("nondigit_test(%s) = %d\n",buf,extract_digits_and_test(buf,buflen,digits));
printf("prefix_test(%s) = %d \n",digits,prefix_test(digits));
printf("ccv1_test(%s) = %d \n",digits,ccv1_test(digits));
printf("histogram_test(%s) = %d \n",digits,histogram_test(digits));
printf("pattern_test(%s) = %d \n",digits,pattern_test(digits));
printf("only_hex_digits(%s) = %d\n",buf,only_hex_digits(buf,strlen(buf)));
printf("only_dec_digits(%s) = %d\n",buf,only_dec_digits(buf,strlen(buf)));
return validate_ccn(buf,buflen);
}
