advent2021

commit f18ac71ad41773ae5feee74a9c2e2c25855a97b6
parent 53faf8ede208ca33cafabf4346559b2eac484744
Author: bsandro <brian.drosan@gmail.com>
Date:   Wed,  1 Dec 2021 23:16:47 +0200

Compatibility fix (fgetln -> fgets)

Diffstat:
M
day01/puzzle1.c
 | 
15
+++++++--------
M
day01/puzzle2.c
 | 
13
+++++--------

2 files changed, 12 insertions(+), 16 deletions(-)
diff --git a/day01/puzzle1.c b/day01/puzzle1.c
@@ -3,6 +3,8 @@
 #include <errno.h>
 #include <string.h>
 
+#define MAX_LEN 8
+
 int puzzle1(const char *filename) {
 	FILE *infile = fopen(filename, "r");
 	if (infile == NULL) {
@@ -10,24 +12,21 @@ int puzzle1(const char *filename) {
 		return -1;
 	}
 
-	char *buf = NULL;
-	size_t len = 0;
+	char buf[MAX_LEN] = {0};
 	int prev_depth = -1;
 	int counter = 0;
 
-	while ((buf = fgetln(infile, &len)) != NULL) {
-		if (len == 0) {
-			fprintf(stderr, "Error: invalid input line\n");
-			counter = -1;
-			break;
-		}
+	while (fgets(buf, MAX_LEN, infile) != NULL) {
 		int depth = atoi(buf);
 		if (prev_depth > -1 && depth > prev_depth) {
 			++counter;
 		}
 		prev_depth = depth;
+		bzero(buf, MAX_LEN);
 	}
 
+	// mutiny! ignoring feof/ferror.
+
 	fclose(infile);
 	return counter;
 }
diff --git a/day01/puzzle2.c b/day01/puzzle2.c
@@ -4,6 +4,8 @@
 #include <string.h>
 #include <stdbool.h>
 
+#define MAX_LEN 8
+
 void rotate_window(int window[3]) {
 	int tmp = window[0];
 	window[0] = window[1];
@@ -30,17 +32,11 @@ int puzzle2(const char *filename) {
 		return -1;
 	}
 
-	char *buf = NULL;
-	size_t len = 0;
+	char buf[MAX_LEN] = {0};
 	int window[3] = {0, 0, 0};
 	int counter = 0;
 
-	while ((buf = fgetln(infile, &len)) != NULL) {
-		if (len == 0) {
-			fprintf(stderr, "Error: invalid input line\n");
-			counter = -1;
-			break;
-		}
+	while (fgets(buf, MAX_LEN, infile) != NULL) {
 		int depth = atoi(buf);
 		int sum_win = sum_window(window);
 		int sum_new = sum_new_window(window, depth);
@@ -49,6 +45,7 @@ int puzzle2(const char *filename) {
 		}
 		rotate_window(window);
 		window[2] = depth;
+		bzero(buf, MAX_LEN);
 	}
 
 	fclose(infile);