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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#if 0
#define PART_1
#else
#define PART_2
#endif
#if 0
#define FILE_PATH "example-valid.txt"
#else
#define FILE_PATH "input.txt"
#endif
char fields[8][4] = {"byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid", "cid"};
size_t valid = 0;
void parse()
{
FILE *fp = fopen(FILE_PATH, "r");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file: %s", FILE_PATH);
exit(EXIT_FAILURE);
}
char line[2048] = {0};
int field_valid[8] = {0};
while(fgets(line, sizeof(line), fp) != NULL)
{
if(line[0] == '\n' || strncmp(line, "EOF", 3) == 0)
{
int result = 1;
for(int i = 0; i < 7; i++)
result *= field_valid[i];
valid += result;
memset(field_valid, 0 , sizeof(field_valid));
continue;
}
char *tok = strtok(line, " ");
while(tok != NULL)
{
for(int i = 0; i < 8; i++)
{
if(strncmp(tok, fields[i], 3) == 0)
{
#ifdef PART_1
field_valid[i] = 1;
#endif
#ifdef PART_2
char *saveptr;
(void)strtok_r(tok, ":", &saveptr);
char *val = strtok_r(NULL, ":", &saveptr);
assert(val != NULL);
assert(strtok_r(NULL, ":", &saveptr) == NULL);
if(val[strlen(val)-1] == '\n') val[strlen(val)-1] = '\0';
int ival;
switch(i)
{
case 0: ival = atoi(val);
if(ival >= 1920 && ival <= 2002) field_valid[i] = 1;
break;
case 1: ival = atoi(val);
if(ival >= 2010 && ival <= 2020) field_valid[i] = 1;
break;
case 2: ival = atoi(val);
if(ival >= 2020 && ival <= 2030) field_valid[i] = 1;
break;
case 3:
if(strlen(val) == 5)
{
if(!(val[3] == 'c' && val[4] == 'm')) break;
char _val[4] = {0}; _val[0] = val[0];
_val[1] = val[1]; _val[2] = val[2];
ival = atoi(_val);
if(ival >= 150 && ival <= 193) field_valid[i] = 1;
}
if(strlen(val) == 4)
{
if(!(val[2] == 'i' && val[3] == 'n')) break;
char _val[3] = {0}; _val[0] = val[0]; _val[1] = val[1];
ival = atoi(_val);
if(ival >= 59 && ival <= 76) field_valid[i] = 1;
}
break;
case 4:
int num = 0;
char valid_vals[16] = "0123456789abcdef";
for(int k = 1; k <= strlen(val); k++)
for(int j = 0; j < 16; j++)
if(val[k] == valid_vals[j]) num++;
if(val[0] == '#' && num == 6) field_valid[i] = 1;
break;
case 5:
int valid_ecl = 0;
char valid_cols[7][4] = {"amb", "blu", "brn", "gry", "grn", "hzl", "oth"};
for(int k = 0; k < 7; k++)
if(strncmp(val, valid_cols[k], 3) == 0) valid_ecl++;
if(valid_ecl == 1) field_valid[i] = 1;
break;
case 6:
int valid_pid = 0;
if(strlen(val) != 9) break;
char valid_nums[10] = "0123456789";
for(int k = 0; k < strlen(val); k++)
for(int j = 0; j < 10; j++)
if(val[k] == valid_nums[j]) valid_pid++;
if(valid_pid == 9) field_valid[i] = 1;
break;
}
#endif
}
}
tok = strtok(NULL, " ");
}
}
fclose(fp);
}
int main(void)
{
parse();
printf("%ld passports are valid\n", valid);
return 0;
}
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