--- a/window/button.cc
+++ b/window/button.cc
@@ -348,11 +348,32 @@ static char* extract_button(int number, 
 	char* data;
 
 	switch(number) {
-	case 0: data = buttonleft; size = buttonleft_cnt; width = 164; height = 110; break;
-	case 1: data = buttonright; size = buttonright_cnt; width = 164; height = 110; break;
-	case 2: data = buttonup; size = buttonup_cnt; width = 110; height = 164; break;
-	case 3: data = buttondown; size = buttondown_cnt; width = 110; height = 164; break;
-	default: return 0;
+		case 0:
+			data = buttonleft;
+			size = buttonleft_cnt;
+			width = 164;
+			height = 110;
+			break;
+		case 1:
+			data = buttonright;
+			size = buttonright_cnt;
+			width = 164;
+			height = 110;
+			break;
+		case 2:
+			data = buttonup;
+			size = buttonup_cnt;
+			width = 110;
+			height = 164;
+			break;
+		case 3:
+			data = buttondown;
+			size = buttondown_cnt;
+			width = 110;
+			height = 164;
+			break;
+		default:
+			return NULL;
 	}
 
 	char* out = new char[width*height];
@@ -388,6 +409,7 @@ struct ButtonColor {
 	void SetBrightness1(int n, int c1);
 	void SetBrightness(int c1, int c2, int c3, int c4, int c5);
 };
+
 ButtonColor::ButtonColor(int r, int g, int b) {
 	is_gray = false;
 	if (r == g && r == b) {
@@ -436,6 +458,7 @@ ButtonColor::ButtonColor(int r, int g, i
 	if (l < 128) s = (hd*255)/(max+min);
 	else s = (hd*255) / (510-(max+min));
 }
+
 void ButtonColor::SetBrightness1(int n, int c1) {
 	if (n < 1 || n > 7) return;
 	as[n] = 255;
@@ -457,9 +480,8 @@ void ButtonColor::SetBrightness1(int n, 
 	c_max[n] = m2;
 	c_mid[n] = (hc*m2 + (hd-hc)*m1) / hd;
 	c_min[n] = m1;
+}
 
-	return;
-}
 void ButtonColor::SetBrightness(int c1, int c2, int c3, int c4, int c5) {
 	rs[0] = bs[0] = gs[0] = as[0] = 0;
 	SetBrightness1(1, c1);
@@ -469,9 +491,9 @@ void ButtonColor::SetBrightness(int c1, 
 	SetBrightness1(5, c5);
 }
 
-#include"rect.h"
-#include<stdlib.h>
-#include<string.h>
+#include "rect.h"
+#include <stdlib.h>
+#include <string.h>
 
 static void draw_button(char* rdata, int width, int height, char* bdata, int bwidth, int bheight, const ButtonColor& color) {
 	const int* rs = color.rs;
@@ -483,8 +505,8 @@ static void draw_button(char* rdata, int
 	ScaleData* data = new ScaleData[width*height];
 	memset(data, 0, sizeof(ScaleData)*width*height);
 
-	int bx,by;
-	int x=0, y=0;
+	int bx, by;
+	int x = 0, y = 0;
 	int x2 = 0, y2 = 0;
 	int xadd = width*65536/bwidth;
 	int yadd = height*65536/bheight;
@@ -522,12 +544,12 @@ static void draw_button(char* rdata, int
 		}
 	}
 	delete[] data;
-	return;
 }
+
 char* create_button(int number, int& width, int& height, int r, int g, int b) {
 	int bwidth, bheight;
 	char* bdata = extract_button(number, bwidth, bheight);
-	if (bdata == 0) return 0;
+	if (bdata == NULL) return NULL;
 	// 拡大率に合わせてwidth,heightをセット
 	if (width == -1 && height == -1) width = bwidth, height = bheight;
 	else if (width == -1) width = bwidth * height / bheight;
@@ -550,7 +572,7 @@ char* create_button(int number, int& wid
 
 static void drawbox(char* buf, const Rect& region, int width, int r, int g, int b, int a) {
 	buf += region.ty*width*4 + region.lx*4;
-	int i,j;
+	int i, j;
 	int h = region.height();
 	int w = region.width();
 	int col = (b&0xff) | ((g&0xff)<<8)| ((r&0xff)<<16)| ((a&0xff)<<24);
@@ -562,8 +584,8 @@ static void drawbox(char* buf, const Rec
 		}
 		buf += width*4;
 	}
-	return;
 }
+
 static void draw_box(char* buf, int width, int height, int kage_w1, int kage_w2, const ButtonColor& color) {
 	const int* rs = color.rs;
 	const int* gs = color.gs;
@@ -587,6 +609,7 @@ static void draw_box(char* buf, int widt
 		drawbox(buf, Rect(width-kage_w2, kage_w2, width-kage_w1, height-kage_w1), width, rs[2], gs[2], bs[2], as[2]);
 	}
 }
+
 char* create_box(int& width, int& height, int r, int g, int b) {
 	ButtonColor color(r,g,b);
 	// scale のカーソル