From 928092a7b82bc6dd16926a378b91e24510b9ec0f Mon Sep 17 00:00:00 2001
From: Bond_009 <bond.009@outlook.com>
Date: Wed, 2 Dec 2020 19:39:20 +0100
Subject: Add day 2

---
 2/part1.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 2/part1.c

(limited to '2/part1.c')

diff --git a/2/part1.c b/2/part1.c
new file mode 100644
index 0000000..ddac78e
--- /dev/null
+++ b/2/part1.c
@@ -0,0 +1,35 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+bool is_valid_password(char * pass, char * policy)
+{
+    int min = atoi(policy);
+    char * minP = strchr(policy, '-');
+    int max = atoi(++minP);
+    char c = *(strchr(minP, ' ') + 1);
+    char * p = pass;
+    int occ = 0;
+    do {
+        if (*p == c) {
+            occ++;
+        }
+    } while (*++p);
+
+    return occ >= min && occ <= max;
+}
+
+int main()
+{
+    FILE * file = fopen("input", "r");
+    char buffer[128] = { 0 };
+    int valid = 0;
+    while (fgets(buffer, 128, file)) {
+        if (is_valid_password(strchr(buffer, ':') + 2, buffer)) {
+            valid++;
+        }
+    }
+
+    printf("%i", valid);
+}
-- 
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