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#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define KEYS_LEN 7
const char* const keys[] = { "byr:", "iyr:", "eyr:", "hgt:", "hcl:", "ecl:", "pid:" };
bool is_valid_field(const char *key, const char *value)
{
if (strncmp(key, "byr", 3) == 0) {
int v = atoi(value);
return v >= 1920 && v <= 2002;
}
if (strncmp(key, "iyr", 3) == 0) {
int v = atoi(value);
return v >= 2010 && v <= 2020;
}
if (strncmp(key, "eyr", 3) == 0) {
int v = atoi(value);
return v >= 2020 && v <= 2030;
}
if (strncmp(key, "hgt", 3) == 0) {
int v = atoi(value);
if (strncmp(value + 3, "cm", 2) == 0) {
return v >= 150 && v <= 193;
}
if (strncmp(value + 2, "in", 2) == 0) {
return v >= 59 && v <= 76;
}
return false;
}
if (strncmp(key, "hcl", 3) == 0) {
if (value[0] != '#') {
return false;
}
for (int i = 1; i < 7; i++) {
if (!(value[i] >= 48 && value[i] <= 57) && !(value[i] >= 97 && value[i] <= 102)) {
return false;
}
}
return true;
}
if (strncmp(key, "ecl", 3) == 0) {
return strncmp(value, "amb", 3) == 0
|| strncmp(value, "blu", 3) == 0
|| strncmp(value, "brn", 3) == 0
|| strncmp(value, "gry", 3) == 0
|| strncmp(value, "grn", 3) == 0
|| strncmp(value, "hzl", 3) == 0
|| strncmp(value, "oth", 3) == 0;
}
if (strncmp(key, "pid", 3) == 0) {
for (int i = 0; i < 9; i++) {
if (!(value[i] >= 48 && value[i] <= 57)) {
return false;
}
}
return !(value[9] >= 48 && value[9] <= 57);
}
return false;
}
bool is_valid_passport(const char *pass)
{
for (int i = 0; i < KEYS_LEN; i++) {
const char *p = strstr(pass, keys[i]);
if (!p) {
return false;
}
if (!is_valid_field(p, p + 4)) {
return false;
}
}
return true;
}
int count_valid_passports(const char *filename)
{
FILE *file = fopen(filename, "r");
// Include space for newline and string terminator
char buffer[128] = { 0 };
uint8_t values = 0;
int correct = 0;
while (fgets(buffer, 128, file)) {
if (buffer[0] == '\n') {
if (values == 0x7f) {
correct++;
}
values = 0;
}
for (int i = 0; i < KEYS_LEN; i++) {
const char *p = strstr(buffer, keys[i]);
if (!p) {
continue;
}
if (is_valid_field(p, p + 4)) {
values = values | (0x1 << i);
}
}
}
if (values == 0x7f) {
correct++;
}
fclose(file);
return correct;
}
int main(int argc, char *argv[])
{
printf("%i", count_valid_passports(argv[argc - 1]));
}
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