2015-05

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "lib/libflint"]
 	path = lib/libflint
-	url = git@git.fputs.com:fputs/libflint
+	url = https://fputs.com/fputs/libflint

include/advent_utility.h

@@ -7,10 +7,15 @@ struct Point {
 };
 
 struct Point new_Point(int, int);
+
 struct Point *new_Point_p(int, int);
+
 int same_Point(const struct Point *, const struct Point *);
+
 int same_Point_v(const void *, const void *);
 
 char *md5_str(const char *);
 
+char *capture_system(const char *);
+
 #endif

src/2015/05.c

@@ -1,10 +1,16 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "input.h"
+#include "advent_utility.h"
 
 void advent2015day05(void) {
-  char *input = get_input("input/2015/05");
+    /* Sometimes, grep really is the best tool */
-  printf("Solution for Day 05 of 2015 is not completed yet\n");
+    char *p1 = capture_system(
-  free(input);
+            "grep -E \"(.*[aeiou]){3}\" ./input/2015/05 | grep \"\\(.\\)\\1\" | egrep -v \"(ab|cd|pq|xy)\" | wc -l");
+    char *p2 = capture_system("grep \"\\(..\\).*\\1\" ./input/2015/05 | grep \"\\(.\\).\\1\" | wc -l");
+
+    printf("%s%s", p1, p2);
+
+    free(p1);
+    free(p2);
 }

src/advent_utility.c

@@ -1,7 +1,14 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
+
+#ifdef __linux__
+
+#include <openssl/md5.h>
+
+#else
 #include <md5.h>
+#endif
 
 #include "advent_utility.h"
 
@@ -32,13 +39,33 @@ int same_Point_v(const void *a, const void *b) {
 
 char *md5_str(const char *input) {
     unsigned char digest[16];
+
+#ifdef __linux__
+    MD5_CTX context;
+    MD5_Init(&context);
+    MD5_Update(&context, input, strlen(input));
+    MD5_Final(digest, &context);
+#else
     struct MD5Context context;
     MD5Init(&context);
     MD5Update(&context, input, strlen(input));
     MD5Final(digest, &context);
+#endif
+
     char *md5string = malloc(33);
     for (int i = 0; i < 16; ++i) {
         sprintf(&md5string[i * 2], "%02x", (unsigned int) digest[i]);
     }
     return md5string;
 }
+
+char *capture_system(const char *cmd) {
+    char *buf = malloc(256);
+    FILE *tmp = popen(cmd, "r");
+    if (tmp == NULL) {
+        printf("failed to open FILE *tmp\n");
+        exit(1);
+    }
+    fgets(buf, 256, tmp);
+    return buf;
+}