REFACTOR: Completely remade the error handling format. Using pre-defined

error codes and error messages to make it easier to debug problems.

src/filters.c

@@ -3,6 +3,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "image/utils.h"
+
 unsigned int
 u32_put_alpha(const unsigned int clr, const unsigned char alpha)
 {
@@ -103,10 +105,10 @@ u32_mask(const unsigned int clr, const char keep)
 			return clr & (BYTE_A | BYTE_B);
 			break;
 		default:
-			return 0;
+			return FAILURE;
 			break;
 	}
-	return 0;
+	return FAILURE;
 }
 
 unsigned int
@@ -114,11 +116,8 @@ u32_rotl(const unsigned int clr, const int n)
 {
 	if (n > 8)
 	{
-		printf(
-		    "ERROR: %i is greater than 8 results in black "
-		    "pixels, please use values less than 8\n",
-		    n);
-		exit(10);
+		LOGERROR(ERR_INVALID_SIZE);
+		return ERR_INVALID_SIZE;
 	}
 	unsigned int red = DECODE_R(clr);
 	unsigned int green = DECODE_G(clr);
@@ -261,13 +260,15 @@ box_blur(const unsigned int* src_buf, const PPM* img, const int radius)
 	unsigned int* first_pass = malloc(img->len * sizeof(unsigned int));
 	if (!first_pass)
 	{
-		return 0;
+		LOGERROR(ERR_BUF_NULL);
+		return NULL;
 	}
 	unsigned int* dst_buf = malloc(img->len * sizeof(unsigned int));
 	if (!dst_buf)
 	{
 		free(first_pass);
-		return 0;
+		LOGERROR(ERR_BUF_NULL);
+		return NULL;
 	}
 	for (int y = 0; y < img->height; y++)
 	{