commit - 90eac7479efe209eac4df46846fb74851d671ef8
commit + b17e9748fad9efd9f4e51b908831b1d6e02876b4
blob - 1b65d4428400d8ada970ac351eadd402bd5f2f60
blob + cd1ea06680981ad7958e3e4aca5e9b28a21bc83e
--- arraylist.h
+++ arraylist.h
@@ -32,7 +32,7 @@
  * 	        // enlarges the allocated array as needed;
  * 	        // list.head may change due to realloc
  * 	        ARRAYLIST_ADD(x, list);
- * 	        if (!x)
+ * 	        if (x == NULL)
  * 	                abort();
  * 	        *x = random_foo_value;
  * 	}
blob - 6b81da5097f413165d395437388a92004d74bb2a
blob + 5df77cf87ea5fd7b1b3e3d0073f2fa02e5c76edc
--- debug.h
+++ debug.h
@@ -33,7 +33,7 @@ dump_atom(const struct diff_data *left, const struct d
 {
 	const char *s;
 
-	if (!atom) {
+	if (atom == NULL) {
 		print("NULL atom\n");
 		return;
 	}
blob - a99ba63a9c677f5ece15973291d9a5c5ae3e84dc
blob + 25e677acde4b2f4134a80545ab78564c5dbb42c0
--- diff_atomize_text.c
+++ diff_atomize_text.c
@@ -59,7 +59,7 @@ diff_data_atomize_text_lines(struct diff_data *d)
 
 		/* Record the found line as diff atom */
 		ARRAYLIST_ADD(atom, d->atoms);
-		if (!atom)
+		if (atom == NULL)
 			return DIFF_RC_ENOMEM;
 
 		*atom = (struct diff_atom){
blob - 56a2983c1ad2e85915e26f7216896658700a0d40
blob + c2ff26743452e2940ddd5e6fc83094b3f5d169de
--- diff_main.c
+++ diff_main.c
@@ -49,7 +49,7 @@ diff_state_add_chunk(struct diff_state *state, bool so
 		result = &state->temp_result;
 
 	ARRAYLIST_ADD(chunk, *result);
-	if (!chunk)
+	if (chunk == NULL)
 		return NULL;
 	*chunk = (struct diff_chunk) {
 		.solved = solved,
@@ -98,7 +98,7 @@ diff_data_init_subsection(struct diff_data *d, struct 
 void
 diff_data_free(struct diff_data *diff_data)
 {
-	if (!diff_data)
+	if (diff_data == NULL)
 		return;
 	if (diff_data->atoms.allocated)
 		ARRAYLIST_FREE(diff_data->atoms);
@@ -159,7 +159,8 @@ diff_run_algo(const struct diff_algo_config *algo_conf
 
 	ARRAYLIST_FREE(state->temp_result);
 
-	if (!algo_config || !algo_config->impl || !state->recursion_depth_left){
+	if (algo_config == NULL || !algo_config->impl ||
+	    !state->recursion_depth_left) {
 		debug("MAX RECURSION REACHED, just dumping diff chunks\n");
 		return diff_algo_none(algo_config, state);
 	}
@@ -198,7 +199,7 @@ diff_run_algo(const struct diff_algo_config *algo_conf
 			struct diff_chunk *final_c;
 
 			ARRAYLIST_ADD(final_c, state->result->chunks);
-			if (!final_c) {
+			if (final_c == NULL) {
 				rc = DIFF_RC_ENOMEM;
 				goto return_rc;
 			}
@@ -236,14 +237,14 @@ diff_main(const struct diff_config *config,
 	struct diff_state state;
 
 	result = malloc(sizeof(struct diff_result));
-	if (!result)
+	if (result == NULL)
 		return NULL;
 
 	*result = (struct diff_result){};
 	diff_data_init_root(&result->left, left_data, left_len);
 	diff_data_init_root(&result->right, right_data, right_len);
 
-	if (!config->atomize_func) {
+	if (config->atomize_func == NULL) {
 		result->rc = DIFF_RC_EINVAL;
 		return result;
 	}
@@ -270,7 +271,7 @@ diff_main(const struct diff_config *config,
 void
 diff_result_free(struct diff_result *result)
 {
-	if (!result)
+	if (result == NULL)
 		return;
 	diff_data_free(&result->left);
 	diff_data_free(&result->right);
blob - 2af135b66a21409f60158b61d17612fdbaf53cb7
blob + cfec82d7353470014c6249bc2c73c7273c40181f
--- diff_main.h
+++ diff_main.h
@@ -65,7 +65,7 @@ ranges_merge(struct range *a, const struct range *b)
 static inline int
 range_len(const struct range *r)
 {
-	if (!r)
+	if (r == NULL)
 		return 0;
 	return r->end - r->start;
 }
blob - 3ac0aea1fea278e8b4ac34648f22ee49af9a008c
blob + 43229a63cba7d76528b622c7c2cdab6a6a86ed7c
--- diff_myers.c
+++ diff_myers.c
@@ -758,7 +758,7 @@ diff_algo_myers_divide(const struct diff_algo_config *
 	size_t kd_len = max + 1;
 	size_t kd_buf_size = kd_len << 1;
 	int *kd_buf = reallocarray(NULL, kd_buf_size, sizeof(int));
-	if (!kd_buf)
+	if (kd_buf == NULL)
 		return DIFF_RC_ENOMEM;
 	int i;
 	for (i = 0; i < kd_buf_size; i++)
@@ -950,7 +950,7 @@ diff_algo_myers(const struct diff_algo_config *algo_co
 	}
 
 	int *kd_buf = reallocarray(NULL, kd_buf_size, sizeof(int));
-	if (!kd_buf)
+	if (kd_buf == NULL)
 		return DIFF_RC_ENOMEM;
 	int i;
 	for (i = 0; i < kd_buf_size; i++)
blob - 5f5769aa7ddcab3c2cb38ad4156cc8e208647fd4
blob + cf447d798c044ec7058121d36ed597b8066a575b
--- diff_output.c
+++ diff_output.c
@@ -114,7 +114,7 @@ diff_plain(FILE *dest, const struct diff_config *diff_
 		return DIFF_RC_EINVAL;
 	result = diff_main(diff_config, info->left_buffer, left_len,
 	    info->right_buffer, right_len);
-	if (!result)
+	if (result == NULL)
 		return DIFF_RC_EINVAL;
 	if (result->rc != DIFF_RC_OK)
 		return result->rc;
@@ -359,7 +359,7 @@ diff_unidiff(FILE *dest, const struct diff_config *dif
 		return DIFF_RC_EINVAL;
 	result = diff_main(diff_config, info->left_buffer, left_len,
 	    info->right_buffer, right_len);
-	if (!result)
+	if (result == NULL)
 		return DIFF_RC_EINVAL;
 	if (result->rc != DIFF_RC_OK)
 		return result->rc;