diff --git a/src/bgm.dummy.c b/src/bgm.dummy.c
index ec766ad..8031d33 100644
--- a/src/bgm.dummy.c
+++ b/src/bgm.dummy.c
@@ -35,41 +35,41 @@ int musbgm_reset(void) {
 }
 
 int musbgm_play(int no, int time, int vol) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
 int musbgm_stop(int no, int time) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
 int musbgm_fade(int no, int time, int vol) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
 int musbgm_getpos(int no) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return 0;
 }
 
 int musbgm_getlen(int no) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return 0;
 }
 
 int musbgm_isplaying(int no) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return 0;
 }
 
 int musbgm_stopall(int time) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
 int musbgm_wait(int no, int timeout) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
diff --git a/src/cdrom.FreeBSD.c b/src/cdrom.FreeBSD.c
index 6375217..903563b 100644
--- a/src/cdrom.FreeBSD.c
+++ b/src/cdrom.FreeBSD.c
@@ -21,6 +21,7 @@
 */
 /* $Id: cdrom.FreeBSD.c,v 1.17 2002/08/18 09:35:29 chikama Exp $ */
 
+#include <errno.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -32,6 +33,7 @@
 #include "portab.h"
 #include "cdrom.h"
 #include "music_private.h"
+#include "system.h"
 
 static int  cdrom_init(char *);
 static int  cdrom_exit(void);
@@ -79,14 +81,14 @@ static int get_cd_entry() {
 
 	/* 最終トラック番号を得る */
 	if (do_ioctl(CDIOREADTOCHEADER, &tochdr) < 0) {
-		perror("CDIOREADTOCHEADER");
+		WARNING("CDIOREADTOCHEADER: %s", strerror(errno));
 		return NG;
 	}
 	
 	lastindex = endtrk = tochdr.ending_track;
 	i = tochdr.ending_track - tochdr.starting_track + 1;
 	if (endtrk <= 1) {  /* ２トラック以上ないとダメ */
-		fprintf(stderr, "No CD-AUDIO in CD-ROM\n");
+		WARNING("No CD-AUDIO in CD-ROM");
 		return NG;
 	}
 	
@@ -98,7 +100,7 @@ static int get_cd_entry() {
 	toc.data_len = (i + 1) * sizeof(struct cd_toc_entry);
 	toc.data = toc_buffer;
 	if (do_ioctl(CDIOREADTOCENTRYS, &toc) < 0) {
-		perror("CDIOREADTOCENTRYS");
+		WARNING("CDIOREADTOCENTRYS: %s", strerror(errno));
 		return NG;
 	}
 
@@ -115,13 +117,13 @@ static int get_cd_entry() {
 	msf.end_s   = toc_buffer[2].addr.msf.second;
 	msf.end_f   = toc_buffer[2].addr.msf.frame;
 	if (do_ioctl(CDIOCPLAYMSF, &msf) < 0) {
-		perror("CDIOPLAYMSF");
-		fprintf(stderr, "CD-ROM: change TRKMODE\n");
+		WARNING("CDIOPLAYMSF: %s", strerror(errno));
+		WARNING("CD-ROM: change TRKMODE");
 		msfmode = FALSE;
 	}
 	/* stop */
 	if (do_ioctl(CDIOCSTOP, NULL) < 0) {
-		perror("CDIOCSTOP");
+		WARNING("CDIOCSTOP: %s", strerror(errno));
 		return NG;
 	}
 	return OK;
@@ -132,7 +134,7 @@ int cdrom_init(char *dev_cd) {
 	if (dev_cd == NULL) return NG;
 
 	if ((cd_fd = open(dev_cd, O_RDONLY, 0)) < 0) {
-		perror("CDROM_DEVICE OPEN");
+		WARNING("CDROM_DEVICE OPEN: %s", strerror(errno));
 		enabled = FALSE;
 		return NG;
 	}
@@ -169,9 +171,9 @@ int cdrom_start(int trk, int loop) {
 		return NG;
 	}
 	/* drive spin up */
-        if (do_ioctl(CDIOCSTART, NULL) < 0) {
-		perror("CDIOCSTART");
-                return NG;
+	if (do_ioctl(CDIOCSTART, NULL) < 0) {
+		WARNING("CDIOCSTART: %s", strerror(errno));
+		return NG;
 	}
 	if (msfmode) {
 		msf.start_m = toc_buffer[trk - 1].addr.msf.minute;
@@ -181,14 +183,14 @@ int cdrom_start(int trk, int loop) {
 		msf.end_s = toc_buffer[trk].addr.msf.second;
 		msf.end_f = toc_buffer[trk].addr.msf.frame;
 		if (do_ioctl(CDIOCPLAYMSF, &msf) < 0) {
-			perror("CDIOPLAYMSF");
+			WARNING("CDIOPLAYMSF: %s", strerror(errno));
 			return NG;
 		}
 	} else {
 		track.start_track = track.end_track = trk;
 		track.start_index = track.end_index = 0;
 		if (do_ioctl(CDIOCPLAYTRACKS, &track) < 0) {
-			perror("CDIOCPLAYTRACKS");
+			WARNING("CDIOCPLAYTRACKS: %s", strerror(errno));
 			return NG;
 		}
 	}
@@ -200,8 +202,8 @@ int cdrom_stop() {
 	if (enabled) {
 		/* if (do_ioctl(CDIOCSTOP, NULL) < 0) { */
 		if (do_ioctl(CDIOCPAUSE, NULL) < 0) {
-			/* perror("CDIOCSTOP"); */
-			perror("CDIOCPAUSE");
+			/* WARNING("CDIOCSTOP: %s", strerror(errno)); */
+			WARNING("CDIOCPAUSE: %s", strerror(errno));
 		}
 		return OK;
 	}
@@ -222,7 +224,7 @@ int cdrom_getPlayingInfo (cd_time *info) {
         s.address_format = CD_MSF_FORMAT;
         s.data_format = CD_CURRENT_POSITION;
 	if (do_ioctl(CDIOCREADSUBCHANNEL, &s) < 0) {
-		perror("CDIOCREADSUBCHANNEL");
+		WARNING("CDIOCREADSUBCHANNEL: %s", strerror(errno));
 		return NG;
 	}
 	if (s.data->header.audio_status != CD_AS_PLAY_IN_PROGRESS) {
diff --git a/src/cdrom.Linux.c b/src/cdrom.Linux.c
index 8d11797..3c1f9ac 100644
--- a/src/cdrom.Linux.c
+++ b/src/cdrom.Linux.c
@@ -21,9 +21,11 @@
 */
 /* $Id: cdrom.Linux.c,v 1.18 2002/08/18 09:35:29 chikama Exp $ */
 
+#include <errno.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
 
@@ -41,6 +43,7 @@ struct cdrom_msf0 {
 #include "portab.h"
 #include "cdrom.h"
 #include "music_private.h"
+#include "system.h"
 
 static int  cdrom_init(char *);
 static int  cdrom_exit(void);
@@ -89,12 +92,12 @@ static int get_cd_entry() {
 	
 	/* 最終トラック番号を得る */
 	if (do_ioctl(CDROMREADTOCHDR, &tochdr) < 0) {
-		perror("CDROMREADTOCHDR");
+		WARNING("CDROMREADTOCHDR: %s", strerror(errno));
 		return NG;
 	}
 	lastindex = endtrk = tochdr.cdth_trk1;
 	if (endtrk <= 1) { /* ２トラック以上ないとダメ */
-		fprintf(stderr, "No CD-AUDIO in CD-ROM\n");
+		WARNING("No CD-AUDIO in CD-ROM");
 		return NG; 
 	}
 	
@@ -105,7 +108,7 @@ static int get_cd_entry() {
 	for (i = 1; i <= endtrk; i++) {
 		toc.cdte_track = i;
 		if (do_ioctl(CDROMREADTOCENTRY, &toc) < 0) {
-			perror("CDROMREADTOCENTRY");
+			WARNING("CDROMREADTOCENTRY: %s", strerror(errno));
 			return NG;
 		}
 		tocmsf[i - 1].minute = toc.cdte_addr.msf.minute;
@@ -115,7 +118,7 @@ static int get_cd_entry() {
 	/* リードアウトを読み出す */
 	toc.cdte_track = CDROM_LEADOUT;
 	if (do_ioctl(CDROMREADTOCENTRY, &toc) < 0) {
-		perror("CDROMREADTOCENTRY");
+		WARNING("CDROMREADTOCENTRY: %s", strerror(errno));
 		return NG;
 	}
 	
@@ -146,13 +149,13 @@ static int get_cd_entry() {
 	msf.cdmsf_sec1   = tocmsf[2].second;
 	msf.cdmsf_frame1 = tocmsf[2].frame;
 	if (do_ioctl(CDROMPLAYMSF, &msf) < 0) {
-		perror("CDROMPLAYMSF");
-		fprintf(stderr, "CD-ROM: change TRKIND mode\n");
+		WARNING("CDROMPLAYMSF: %s", strerror(errno));
+		WARNING("CD-ROM: change TRKIND mode");
 		msfmode = FALSE;
 	}
 	/* stop */
 	if (do_ioctl(CDROMSTOP, NULL) < 0) {
-		perror("CDROMSTOP");
+		WARNING("CDROMSTOP: %s", strerror(errno));
 		return NG;
 	}
 	return OK;
@@ -163,7 +166,7 @@ static int cdrom_init(char *dev_cd) {
 	if (dev_cd == NULL) return NG;
 
 	if ((cd_fd = open(dev_cd, O_RDONLY, 0)) < 0) {
-		perror("CDROM_DEVICE OPEN");
+		WARNING("CDROM_DEVICE OPEN: %s", strerror(errno));
 		enabled = FALSE;
 		return NG;
 	}
@@ -200,9 +203,9 @@ static int cdrom_start(int trk, int loop) {
 		return NG;
 	}
 	/* drive spin up */
-        if (do_ioctl(CDROMSTART, NULL) < 0) {
-		perror("CDROMSTART");
-                return NG;
+	if (do_ioctl(CDROMSTART, NULL) < 0) {
+		WARNING("CDROMSTART: %s", strerror(errno));
+		return NG;
 	}
 	
 	if (msfmode) {
@@ -213,7 +216,7 @@ static int cdrom_start(int trk, int loop) {
 		msf.cdmsf_sec1   = tocmsf[trk].second;
 		msf.cdmsf_frame1 = tocmsf[trk].frame;
 		if (do_ioctl(CDROMPLAYMSF, &msf) < 0) {
-			perror("CDROMPLAYMSF");
+			WARNING("CDROMPLAYMSF: %s", strerror(errno));
 			return NG;
 		}
 		return OK;
@@ -221,7 +224,7 @@ static int cdrom_start(int trk, int loop) {
 		ti.cdti_trk0 = ti.cdti_trk1 = trk;
 		ti.cdti_ind0 = ti.cdti_ind1 = 0;
 		if (do_ioctl(CDROMPLAYTRKIND, &ti) < 0) {
-			perror("CDROMPLAYTRKIND");
+			WARNING("CDROMPLAYTRKIND: %s", strerror(errno));
 			return NG;
 		}
 		return OK;
@@ -233,8 +236,8 @@ static int cdrom_stop() {
 	if (enabled) {
 		/* if (do_ioctl(CDROMSTOP, NULL) < 0) { */
 		if (do_ioctl(CDROMPAUSE, NULL) < 0) {
-			/* perror("CDROMSTOP"); */
-			perror("CDROMPAUSE");
+			/* WARNING("CDROMSTOP: %s", strerror(errno)); */
+			WARNING("CDROMPAUSE: %s", strerror(errno));
 			return NG;
 		}
 		return OK;
@@ -251,7 +254,7 @@ static int cdrom_getPlayingInfo (cd_time *info) {
 	
 	sc.cdsc_format = CDROM_MSF;
 	if (do_ioctl(CDROMSUBCHNL, &sc) < 0) {
-		perror("CDROMSUBCHNL");
+		WARNING("CDROMSUBCHNL: %s", strerror(errno));
 		return NG;
 	}
 	if (sc.cdsc_audiostatus != CDROM_AUDIO_PLAY) {
diff --git a/src/cmdq.c b/src/cmdq.c
index 5eb692f..13f9a4b 100644
--- a/src/cmdq.c
+++ b/src/cmdq.c
@@ -30,9 +30,6 @@
 #include "savedata.h"
 #include "utfsjis.h"
 
-#define WARN_SAVEERR(cmd, st) \
-if (st > 200) fprintf(stderr, "WARNING: Fail to save (cmd=%s, stat=%d)", cmd, st)
-
 void commandQD() {
 	/* 変数領域などのデータをセーブする。（全セーブ）*/
 	int num   = getCaliValue();
@@ -43,7 +40,7 @@ void commandQD() {
 		sysVar[0] = save_saveAll(num - 1);
 	}
 	
-	WARN_SAVEERR("QD", sysVar[0]);
+	if (sysVar[0] > 200) WARNING("Failed to save (%d)", sysVar[0]);
 	
 	DEBUG_COMMAND("QD %d:",num);
 }
@@ -61,7 +58,7 @@ void commandQP() {
 		sysVar[0] = save_savePartial(num - 1, &point, cnt);
 	}
 	
-	WARN_SAVEERR("QP", sysVar[0]);
+	if (sysVar[0] > 200) WARNING("Failed to save (%d)", sysVar[0]);
 	
 	DEBUG_COMMAND("QP %d,%d,%d:", num, point.var, cnt);
 }
@@ -77,7 +74,7 @@ void commandQC() {
 		sysVar[0] = save_copyAll(num1 - 1, num2 - 1);
 	}
 	
-	WARN_SAVEERR("QC", sysVar[0]);
+	if (sysVar[0] > 200) WARNING("Failed to save (%d)", sysVar[0]);
 	
 	DEBUG_COMMAND("QC %d,%d:",num1,num2);
 }
@@ -108,7 +105,7 @@ void commandQE() {
 		break;
 	}
 	free(fname_utf8);
-	WARN_SAVEERR("QE", sysVar[0]);
+	if (sysVar[0] > 200) WARNING("Failed to save (%d)", sysVar[0]);
 	
 	DEBUG_COMMAND("QE %d,%s,%d,%d:", type, filename, var, cnt);
 }
diff --git a/src/hankaku.c b/src/hankaku.c
index d562790..37f370f 100644
--- a/src/hankaku.c
+++ b/src/hankaku.c
@@ -28,6 +28,7 @@
 
 #include "portab.h"
 #include "hankaku.h"
+#include "system.h"
 
 static const BYTE hankakutable[3][192] = {{
 	// 0x8140 - 0x81ff
@@ -137,10 +138,8 @@ static BYTE *zen2han_sjis(const BYTE *src) {
 	char *dst, *_dst;
 	
 	dst = _dst = malloc(strlen(src) + 1);
-	if (dst == NULL) {
-		fprintf(stderr, "zen2han(): Out of Memory (size %zu)", strlen(src) + 1);
-		return NULL;
-	}
+	if (dst == NULL)
+		NOMEMERR();
 	
 	while(0 != (c0 = *src++)) {
 		if (c0 < 0x81) {
@@ -168,10 +167,8 @@ static BYTE *zen2han_sjis(const BYTE *src) {
 static char *zen2han_utf8(const char *src) {
 	char *dst, *_dst;
 	dst = _dst = malloc(strlen(src) + 1);
-	if (dst == NULL) {
-		fprintf(stderr, "zen2han(): Out of Memory (size %zu)", strlen(src) + 1);
-		return NULL;
-	}
+	if (dst == NULL)
+		NOMEMERR();
 
 	const char *p = src;
 	while (*p) {
@@ -364,10 +361,8 @@ BYTE *han2zen(const BYTE *src, CharacterEncoding enc) {
 	BYTE *dst, *_dst;
 	dst = _dst = malloc(strlen(src) * 2 + 1);
 	
-	if (dst == NULL) {
-		fprintf(stderr, "han2zen(): Out of Memory (size %zu)", strlen(src) *2 + 1);
-		return NULL;
-	}
+	if (dst == NULL)
+		NOMEMERR();
 	
 	while(0 != (c0 = *src++)) {
 		if (c0 == 0x20) {
diff --git a/src/midi.sdlmixer.c b/src/midi.sdlmixer.c
index 26652bc..8527c6d 100644
--- a/src/midi.sdlmixer.c
+++ b/src/midi.sdlmixer.c
@@ -23,6 +23,7 @@
 #include <SDL_mixer.h>
 
 #include "portab.h"
+#include "system.h"
 #include "midi.h"
 
 // MIX_INIT_FLUIDSYNTH was renamed to MIX_INIT_MID in SDL_mixer 2.0.2
@@ -163,7 +164,7 @@ static int midi_fadestart(int time, int volume, int stop) {
 		fade_tick = SDL_GetTicks() + time;
 		return OK;
 	}
-	printf("midi_fadestart(%d, %d, %d) unsupported\n", time, volume, stop);
+	WARNING("(time=%d, volume=%d, stop=%d) unsupported", time, volume, stop);
 	return NG;
 }
 
diff --git a/src/music.c b/src/music.c
index 061f3f3..5dd88ac 100644
--- a/src/music.c
+++ b/src/music.c
@@ -21,8 +21,7 @@
 */
 #include "portab.h"
 
-#include <stdio.h>
-
+#include "system.h"
 #include "music.h"
 #include "music_private.h"
 
@@ -272,7 +271,7 @@ boolean mus_pcm_get_state() {
 int mus_mixer_fadeout_start(int device, int time, int volume, int stop) {
 	if (device == MIX_MIDI)
 		return musmidi_fadestart(time, volume, stop);
-	printf("%s(%d, %d, %d, %d) not implemented\n", __func__, device, time, volume, stop);
+	WARNING("(device=%d, time=%d, volume=%d, stop=%d) not implemented", device, time, volume, stop);
 	return NG;
 }
 
@@ -286,7 +285,7 @@ int mus_mixer_fadeout_start(int device, int time, int volume, int stop) {
 boolean mus_mixer_fadeout_get_state(int device) {
 	if (device == MIX_MIDI)
 		return musmidi_fading();
-	printf("%s(%d) not implemented\n", __func__, device);
+	WARNING("(device=%d) not implemented", device);
 	return FALSE;
 }
 
@@ -295,7 +294,7 @@ boolean mus_mixer_fadeout_get_state(int device) {
  *   device: 指定デバイス
  */
 int mus_mixer_fadeout_stop(int device) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
@@ -306,7 +305,7 @@ int mus_mixer_fadeout_stop(int device) {
  *   return: ミキサーレベル(0 - 100) (ゲーム内で設定された値)
  */
 int mus_mixer_get_level(int device) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return 0;
 }
 
@@ -380,7 +379,7 @@ int mus_wav_fadeout_start(int ch, int time, int volume, int stop) {
 	if (volume == 0 && stop)
 		return muspcm_fadeout(ch + 1, time);
 
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
@@ -389,7 +388,7 @@ int mus_wav_fadeout_start(int ch, int time, int volume, int stop) {
  *   ch: channel (0-127)
  */
 int mus_wav_fadeout_stop(int ch) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
@@ -401,7 +400,7 @@ int mus_wav_fadeout_stop(int ch) {
  *           FALSE -> フェード中でない
  */
 boolean mus_wav_fadeout_get_state(int ch) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return FALSE;
 }
 
@@ -424,7 +423,7 @@ int mus_wav_waitend(int ch) {
  *   time: 待ち時間(msec)
  */
 int mus_wav_waittime(int ch, int time) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
@@ -444,7 +443,7 @@ int mus_wav_wavtime(int ch) {
  *   num: ファイル番号 (1-65535)
  */
 int mus_wav_load_lrsw(int ch, int num) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
@@ -477,11 +476,11 @@ int mus_bgm_wait(int no, int timeout) {
 }
 
 int mus_bgm_waitpos(int no, int index) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
 int mus_vol_set_valance(int *vols, int num) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
diff --git a/src/pcm.sdlmixer.c b/src/pcm.sdlmixer.c
index 8d03890..8de7af3 100644
--- a/src/pcm.sdlmixer.c
+++ b/src/pcm.sdlmixer.c
@@ -308,7 +308,7 @@ boolean muspcm_isplaying(int slot) {
 
 // 指定のチャンネルの再生が終了するまで待つ
 int muspcm_waitend(int slot) {
-	printf("%s not implemented\n", __func__);
+	WARNING("not implemented");
 	return NG;
 }
 
diff --git a/src/profile.c b/src/profile.c
index 8dfa1ab..0514ed1 100644
--- a/src/profile.c
+++ b/src/profile.c
@@ -22,6 +22,7 @@
 */
 /* $Id: profile.c,v 1.6 2001/04/02 21:00:44 chikama Exp $ */
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -36,6 +37,7 @@
 
 #include "portab.h"
 #include "profile.h"
+#include "system.h"
 
 #define RC_NAME ".xsys35rc"
 #define RC_LINE_CHARS_MAX 256
@@ -69,10 +71,8 @@ static boolean insert_profile(const char *name, const char *value)
 	}
 
 	profile = realloc(profile, sizeof(struct profile_kv) * (profile_values + 1));
-	if (!profile) {
-		perror("realloc()");
-		return FALSE;
-	}
+	if (!profile)
+		NOMEMERR();
 
 	profile[profile_values].name = strdup(name);
 	profile[profile_values].value = strdup(value);
@@ -95,7 +95,7 @@ static int load_rc_file(const char *profile_path)
 			if (feof(fp))
 				break;
 			else {
-				perror("fgets()");
+				WARNING("%s: %s", profile_path, strerror(errno));
 				return 1;
 			}
 		}
@@ -122,7 +122,7 @@ static int load_rc_file(const char *profile_path)
 			continue;
 
 		if (!(p = strchr(rc_line, ':'))) {
-			fprintf(stderr, "XSYSTEM35: Syntax Error in '%s' line %d.\n", profile_path, line);
+			WARNING("Syntax Error in '%s' line %d.", profile_path, line);
 			return 1;
 		}
 
diff --git a/src/savedata.c b/src/savedata.c
index ef358b6..9febdf9 100644
--- a/src/savedata.c
+++ b/src/savedata.c
@@ -221,17 +221,16 @@ int save_copyAll(int dstno, int srcno) {
 	int status, filesize;
 	
 	if (dstno >= SAVE_MAXNUMBER || srcno >= SAVE_MAXNUMBER) {
-		// fprintf(stderr, "dstno or srcno is outof range\n");
 		return SAVE_SAVEERR;
 	}
 	saveTop = loadGameData(srcno, &status, &filesize);
 	if (saveTop == NULL)
 		return SAVE_SAVEERR;
 	if (((Ald_baseHdr *)saveTop)->version != SAVE_DATAVERSION) {
-		fprintf(stderr, "save_copyAll(): endian mismatch\n");
+		WARNING("endian mismatch");
 		free(saveTop);
 		return SAVE_SAVEERR;
-        }
+	}
 	status = saveGameData(dstno, saveTop, filesize);
 	
 	free(saveTop);
@@ -256,23 +255,20 @@ int save_loadPartial(int no, struct VarRef *vref, int cnt) {
 	
 	saveTop = loadGameData(no, &status, &filesize);
 	if (saveTop == NULL) {
-		// fprintf(stderr, "loadGameData() faild\n");
 		return status;
 	}
 	
 	if (filesize <= sizeof(Ald_baseHdr)) {
-		// fprintf(stderr, "filesize too short\n");
 		goto errexit;
 	}
 
 	save_base = (Ald_baseHdr *)saveTop;
 	if (save_base->version != SAVE_DATAVERSION) {
-		fprintf(stderr, "save_loadPartial(): endian mismatch\n");
+		WARNING("endian mismatch");
 		goto errexit;
 	}
 
 	if (save_base->varSys[vref->page] == 0) {
-		// fprintf(stderr, "No available Variable\n");
 		goto errexit;
 	}
 	vtop = saveTop + save_base->varSys[vref->page] + sizeof(Ald_sysVarHdr);
@@ -314,9 +310,9 @@ int save_savePartial(int no, struct VarRef *vref, int cnt) {
 		goto errexit;
 	save_base = (Ald_baseHdr *)saveTop;
 	if (save_base->version != SAVE_DATAVERSION) {
-		fprintf(stderr, "save_savePartial(): endian mismatch\n");
+		WARNING("endian mismatch");
 		goto errexit;
-        }
+	}
 	vtop = saveTop + save_base->varSys[vref->page] + sizeof(Ald_sysVarHdr);
 	tmp = (WORD *)vtop + vref->index;
 	for (i = 0; i < cnt; i++) {
@@ -352,7 +348,7 @@ int save_loadAll(int no) {
 	/* 各種データの反映 */
 	save_base = (Ald_baseHdr *)saveTop;
 	if (save_base->version != SAVE_DATAVERSION) {
-		fprintf(stderr, "save_loadAll(): endian mismatch\n");
+		WARNING("endian mismatch");
 		goto errexit;
 	}
 	if (strcmp(SAVE_DATAID, save_base->ID) != 0)
diff --git a/src/scenario.c b/src/scenario.c
index 0219010..8f5a308 100644
--- a/src/scenario.c
+++ b/src/scenario.c
@@ -520,8 +520,7 @@ void sl_returnGoto(int address) {
 		} else if (*tmp == STACK_VARIABLE) {
 			popVars(tmp);
 		} else {
-			fprintf(stderr, "%d \n", *tmp);
-			SYSERROR("Stack buffer is illegal");
+			SYSERROR("Stack buffer is illegal: %d", *tmp);
 		}
 		free(tmp);
 		tmp = sl_pop();
diff --git a/src/sdl_video.c b/src/sdl_video.c
index d3c4988..c71ac19 100644
--- a/src/sdl_video.c
+++ b/src/sdl_video.c
@@ -172,13 +172,6 @@ static void makeDIB(int width, int height, int depth) {
 		memset(sdl_dib->format->palette->colors, 0, sizeof(SDL_Color)*256);
 	}
 
-#if 0
-	printf("DIB depth %d\n", sdl_dib->format->BitsPerPixel);
-	printf("  R %04x G %04x B %04x A %04x\n",
-	       sdl_dib->format->Rmask, sdl_dib->format->Gmask,
-	       sdl_dib->format->Bmask, sdl_dib->format->Amask);
-#endif
-	
 	if (sdl_dibinfo) {
 		free(sdl_dibinfo);
 	}
diff --git a/src/selection.c b/src/selection.c
index 4fd8b3f..d4f080b 100644
--- a/src/selection.c
+++ b/src/selection.c
@@ -293,10 +293,10 @@ static void init_selwindow() {
 		drawLineFrame(r.x, r.y, r.w, r.h);
 		break;
 	case WINDOW_FRAME_CG:
-		printf("frameType is CG %d,%d,%d\n",sel.FrameCgNoTop, sel.FrameCgNoMid, sel.FrameCgNoBot);
+		NOTICE("frameType is CG %d,%d,%d",sel.FrameCgNoTop, sel.FrameCgNoMid, sel.FrameCgNoBot);
 		break;
 	default:
-		printf("frameType is Default");
+		NOTICE("frameType is Default");
 		break;
 	}
 	ags_setFont(FONT_GOTHIC, sel.MsgFontSize);