fix unused fread return value warnings

tools/common.h

@@ -21,7 +21,10 @@ uint8_t *read_u8(char *filename, int *size) {
 	*size = ftell(f);
 	rewind(f);
 	uint8_t *data = malloc(*size);
-	fread(data, 1, *size, f);
+	if (*size != (int)fread(data, 1, *size, f)) {
+		fprintf(stderr, "Could not read file: \"%s\"\n", filename);
+		exit(1);
+	}
 	fclose(f);
 	return data;
 }

tools/gfx.c

@@ -230,8 +230,13 @@ int png_get_width(char *filename) {
 	const int OFFSET_WIDTH = 16;
 	uint8_t bytes[4];
 	fseek(f, OFFSET_WIDTH, SEEK_SET);
-	fread(bytes, 1, 4, f);
+	size_t size = 4;
+	size_t result = fread(bytes, 1, size, f);
 	fclose(f);
+	if (result != size) {
+		fprintf(stderr, "Could not read file at offset 0x%x: \"%s\"\n", OFFSET_WIDTH, filename);
+		exit(1);
+	}
 
 	int width = 0;
 	for (int i = 0; i < 4; i++) {

tools/palette.c

@@ -29,7 +29,11 @@ void print_pokemon_palette(char* palette_filename) {
 	}
 
 	fseek(f, 2, SEEK_SET);
-	fread(bytes, 1, 4, f);
+	size_t size = 4;
+	if (size != fread(bytes, 1, size, f)) {
+		fprintf(stderr, "failed to read file %s\n", palette_filename);
+		exit(1);
+	}
 	fclose(f);
 
 	print_rgb((bytes[1] << 8) | bytes[0]);
@@ -39,7 +43,7 @@ void print_pokemon_palette(char* palette_filename) {
 void print_palette(char* palette_filename) {
 	FILE* f;
 	uint8_t* bytes;
-	long size;
+	size_t size;
 	int i;
 
 	f = fopen(palette_filename, "rb");
@@ -63,10 +67,13 @@ void print_palette(char* palette_filename) {
 	}
 
 	fseek(f, 0, SEEK_SET);
-	fread(bytes, 1, size, f);
+	if (size != fread(bytes, 1, size, f)) {
+		fprintf(stderr, "failed to read file %s\n", palette_filename);
+		exit(1);
+	}
 	fclose(f);
 
-	for (i = 0; i + 1 < size; i += 2) {
+	for (i = 0; i + 1 < (int)size; i += 2) {
 		print_rgb((bytes[i + 1] << 8) | bytes[i]);
 	}
 }

tools/png_dimensions.c

@@ -22,8 +22,12 @@ void output_dimensions(char* png_filename, char* out_filename) {
 
 	// width
 	fseek(f, 16, SEEK_SET);
-	fread(bytes, 1, 4, f);
+	int size = fread(bytes, 1, 4, f);
 	fclose(f);
+	if (size != 4) {
+		fprintf(stderr, "failed to read at offset 0x10 in file %s\n", png_filename);
+		exit(1);
+	}
 
 	width = 0;
 	for (i = 0; i < 4; i++) {

tools/pokemon_animation.c

@@ -38,7 +38,7 @@ void make_frames(struct Frames* frames, struct Bitmasks* bitmasks, char* tilemap
 	uint8_t* tilemap;
 	uint8_t* this_frame;
 	FILE* f;
-	long size;
+	size_t size;
 	int width;
 	int height;
 	uint8_t byte;
@@ -48,7 +48,7 @@ void make_frames(struct Frames* frames, struct Bitmasks* bitmasks, char* tilemap
 
 	f = fopen(tilemap_filename, "rb");
 	if (f == NULL) {
-		fprintf(stderr, "could not open file %s", tilemap_filename);
+		fprintf(stderr, "could not open file %s\n", tilemap_filename);
 		exit(1);
 	}
 
@@ -65,15 +65,21 @@ void make_frames(struct Frames* frames, struct Bitmasks* bitmasks, char* tilemap
 		fprintf(stderr, "malloc failure\n");
 		exit(1);
 	}
-	fread(tilemap, 1, size, f);
+	if (size != fread(tilemap, 1, size, f)) {
+		fprintf(stderr, "failed to read file %s\n", tilemap_filename);
+		exit(1);
+	}
 	fclose(f);
 
 	f = fopen(dimensions_filename, "rb");
 	if (f == NULL) {
-		fprintf(stderr, "could not open file %s", dimensions_filename);
+		fprintf(stderr, "could not open file %s\n", dimensions_filename);
+		exit(1);
+	}
+	if (1 != fread(&byte, 1, 1, f))  {
+		fprintf(stderr, "failed to read file %s\n", dimensions_filename);
 		exit(1);
 	}
-	fread(&byte, 1, 1, f);
 	fclose(f);
 
 	width = byte & 0xf;
@@ -137,7 +143,7 @@ void make_frames(struct Frames* frames, struct Bitmasks* bitmasks, char* tilemap
 	//}
 	//free(frames->frames);
 
-	//fprintf(stderr, "num bitmasks: %d", bitmasks->num_bitmasks);
+	//fprintf(stderr, "num bitmasks: %d\n", bitmasks->num_bitmasks);
 	//for (i = 0; i < bitmasks->num_bitmasks; i++) {
 	//	free(bitmasks->bitmasks[i].data);
 	//	fprintf(stderr, "freed bitmask %d\n", i);
@@ -263,7 +269,7 @@ int main(int argc, char* argv[]) {
 
 	//ext = strrchr(argv[3], '.');
 	//if (!ext || ext == argv[3]) {
-	//	fprintf(stderr, "need a file extension to determine what to write to %s", argv[3]);
+	//	fprintf(stderr, "need a file extension to determine what to write to %s\n", argv[3]);
 	//}
 
 	make_frames(&frames, &bitmasks, tilemap_filename, dimensions_filename);

tools/pokemon_animation_graphics.c

@@ -100,7 +100,10 @@ void create_tilemap(struct Tilemap* tilemap, struct Graphic* graphic, char* grap
 		fprintf(stderr, "malloc failure\n");
 		exit(1);
 	}
-	fread(graphics, 1, graphics_size, f);
+	if (graphics_size != (long)fread(graphics, 1, graphics_size, f)) {
+		fprintf(stderr, "failed to read file %s\n", graphics_filename);
+		exit(1);
+	}
 	fclose(f);
 
 	int num_tiles_per_frame = width * height;
@@ -213,7 +216,10 @@ int main(int argc, char* argv[]) {
 	if (!f) {
 		exit(1);
 	}
-	fread(bytes, 1, 1, f);
+	if (1 != fread(bytes, 1, 1, f)) {
+		fprintf(stderr, "failed to read file %s\n", dimensions_filename);
+		exit(1);
+	}
 	fclose(f);
 	width = bytes[0] & 0xf;
 	height = bytes[0] >> 4;