From e5535fad320c9ba0e75f419117ab2ae6c0bcbb09 Mon Sep 17 00:00:00 2001
From: Sigrid <ftrvxmtrx@gmail.com>
Date: Thu, 29 Apr 2021 23:35:52 +0200
Subject: [PATCH] libtags: modules: ignore empty title

---
 sys/src/cmd/audio/libtags/it.c  | 4 ++--
 sys/src/cmd/audio/libtags/mod.c | 4 ++--
 sys/src/cmd/audio/libtags/s3m.c | 4 ++--
 sys/src/cmd/audio/libtags/xm.c  | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/sys/src/cmd/audio/libtags/it.c b/sys/src/cmd/audio/libtags/it.c
index 5429da9c6..6b5c5f0fe 100644
--- a/sys/src/cmd/audio/libtags/it.c
+++ b/sys/src/cmd/audio/libtags/it.c
@@ -8,8 +8,8 @@ tagit(Tagctx *ctx)
 	if(ctx->read(ctx, d, 4+26) != 4+26 || memcmp(d, "IMPM", 4) != 0)
 		return -1;
 	d[4+26] = 0;
-	cp437toutf8(o, sizeof(o), d+4, 26);
-	txtcb(ctx, Ttitle, "", o);
+	if(cp437toutf8(o, sizeof(o), d+4, 26) > 0)
+		txtcb(ctx, Ttitle, "", o);
 
 	return 0;
 }
diff --git a/sys/src/cmd/audio/libtags/mod.c b/sys/src/cmd/audio/libtags/mod.c
index c669eabfb..fe5bd4a01 100644
--- a/sys/src/cmd/audio/libtags/mod.c
+++ b/sys/src/cmd/audio/libtags/mod.c
@@ -41,8 +41,8 @@ tagmod(Tagctx *ctx)
 		return -1;
 	if(ctx->read(ctx, d, 20) != 20)
 		return -1;
-	cp437toutf8(o, sizeof(o), d, 20);
-	txtcb(ctx, Ttitle, "", o);
+	if(cp437toutf8(o, sizeof(o), d, 20) > 0)
+		txtcb(ctx, Ttitle, "", o);
 
 	return 0;
 }
diff --git a/sys/src/cmd/audio/libtags/s3m.c b/sys/src/cmd/audio/libtags/s3m.c
index f94bd18c0..44a85f3cd 100644
--- a/sys/src/cmd/audio/libtags/s3m.c
+++ b/sys/src/cmd/audio/libtags/s3m.c
@@ -10,8 +10,8 @@ tags3m(Tagctx *ctx)
 	d[28] = 0;
 	for(s = d+27; s != d-1 && (*s == ' ' || *s == 0); s--);
 	s[1] = 0;
-	cp437toutf8(o, sizeof(o), d, s+1-d);
-	txtcb(ctx, Ttitle, "", o);
+	if(cp437toutf8(o, sizeof(o), d, s+1-d) > 0)
+		txtcb(ctx, Ttitle, "", o);
 
 	return 0;
 }
diff --git a/sys/src/cmd/audio/libtags/xm.c b/sys/src/cmd/audio/libtags/xm.c
index 13e54297f..7e97c7b54 100644
--- a/sys/src/cmd/audio/libtags/xm.c
+++ b/sys/src/cmd/audio/libtags/xm.c
@@ -9,8 +9,8 @@ tagxm(Tagctx *ctx)
 		return -1;
 	d[17+20] = 0;
 	for(s = d+17; *s == ' '; s++);
-	cp437toutf8(o, sizeof(o), d+17, 20);
-	txtcb(ctx, Ttitle, "", o);
+	if(cp437toutf8(o, sizeof(o), d+17, 20) > 0)
+		txtcb(ctx, Ttitle, "", o);
 
 	return 0;
 }