From 9d049ff861c336ab9098246d1dfa7471f6c16a03 Mon Sep 17 00:00:00 2001
From: Mart Lubbers <mart@martlubbers.net>
Date: Sun, 5 Dec 2021 14:15:47 +0100
Subject: [PATCH] use uthash safely in day 5

---
 05a.c    | 8 ++++++--
 05b.c    | 7 +++++--
 Makefile | 2 ++
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/05a.c b/05a.c
index cdebe38..8a2e9f1 100644
--- a/05a.c
+++ b/05a.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdint.h>
 #include <uthash.h>
 
 #define SWAP(x, y) { x ^= y; y ^= x; x ^= y; }
@@ -9,13 +10,16 @@ struct entry { struct point key; int i; UT_hash_handle hh; };
 void mark_point(int x, int y, struct entry **entries, int *r)
 {
 	struct entry *p;
-	struct point s = { .x=x, .y=y };
+	struct point s;
+	memset(&s, 0, sizeof s);
+	s.x = x;
+	s.y = y;
 	HASH_FIND(hh, *entries, &s, sizeof(struct point), p);
 	if (p) {
 		if (p->i++ == 1)
 			*r = *r+1;
 	} else {
-		p = malloc(sizeof(struct entry));
+		p = calloc(1, sizeof(struct entry));
 		p->key = s;
 		p->i = 1;
 		HASH_ADD(hh, *entries, key, sizeof(struct point), p);
diff --git a/05b.c b/05b.c
index f8dd141..509c555 100644
--- a/05b.c
+++ b/05b.c
@@ -9,13 +9,16 @@ struct entry { struct point key; int i; UT_hash_handle hh; };
 void mark_point(int x, int y, struct entry **entries, int *r)
 {
 	struct entry *p;
-	struct point s = {.x=x, .y=y};
+	struct point s;
+	memset(&s, 0, sizeof s);
+	s.x = x;
+	s.y = y;
 	HASH_FIND(hh, *entries, &s, sizeof(struct point), p);
 	if (p) {
 		if (p->i++ == 1)
 			*r = *r+1;
 	} else {
-		p = malloc(sizeof(struct entry));
+		p = calloc(1, sizeof(struct entry));
 		p->key = s;
 		p->i = 1;
 		HASH_ADD(hh, *entries, key, sizeof(struct point), p);
diff --git a/Makefile b/Makefile
index 6749bac..dfdd641 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,8 @@ all: $(BINARIES)
 clean:
 	$(RM) *.o a.out $(BINARIES)
 
+05%: CFLAGS+=-DHASH_BLOOM
+
 run: $(addprefix run_,$(BINARIES))
 
 run_%a: %a
-- 
2.20.1