tag: added buffered versions of the tag_print.c code

Currently, when the tag cache is being serialized to hard disk, the
stdio buffer is flushed before every song, because tag_print.c
performs unbuffered writes on the raw file descriptor.  Unfortunately,
the fdprintf() API allows buffered I/O only for a client connection by
looking up the client pointer owning the file descriptor - for stdio,
this is not possible.  To re-enable proper stdio buffering, we have to
duplicate the tag_print.c code without fprintf() instead of our custom
fdprintf() hack.  Add this duplicated code to tag_save.c.

4 files changed, 85 insertions, 3 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index ba7b7c3a..1a631d1c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -88,6 +88,7 @@ mpd_headers = \
 	tag_pool.h \
 	tag_id3.h \
 	tag_print.h \
+	tag_save.h \
 	tagTracker.h \
 	utf8.h \
 	utils.h \
@@ -154,6 +155,7 @@ mpd_SOURCES = \
 	tag_pool.c \
 	tag_id3.c \
 	tag_print.c \
+	tag_save.c \
 	tagTracker.c \
 	utils.c \
 	volume.c \
diff --git a/src/song_save.c b/src/song_save.c
index a7b39804..a875a65f 100644
--- a/src/song_save.c
+++ b/src/song_save.c
@@ -17,7 +17,7 @@
  */
 
 #include "song_save.h"
-#include "song_print.h"
+#include "tag_save.h"
 #include "directory.h"
 #include "path.h"
 #include "utils.h"
@@ -27,6 +27,24 @@
 #define SONG_KEY	"key: "
 #define SONG_MTIME	"mtime: "
 
+static void song_save_url(FILE *fp, Song * song)
+{
+	if (song->parentDir != NULL && song->parentDir->path != NULL)
+		fprintf(fp, SONG_FILE "%s/%s\n",
+			getDirectoryPath(song->parentDir), song->url);
+	else
+		fprintf(fp, SONG_FILE "%s\n",
+			song->url);
+}
+
+static void song_save(FILE *fp, Song * song)
+{
+	song_save_url(fp, song);
+
+	if (song->tag != NULL)
+		tag_save(fp, song->tag);
+}
+
 void writeSongInfoFromList(FILE * fp, SongList * list)
 {
 	ListNode *tempNode = list->firstNode;
@@ -35,8 +53,7 @@ void writeSongInfoFromList(FILE * fp, SongList * list)
 
 	while (tempNode != NULL) {
 		fprintf(fp, "%s%s\n", SONG_KEY, tempNode->key);
-		fflush(fp);
-		printSongInfo(fileno(fp), (Song *) tempNode->data);
+		song_save(fp, (Song *) tempNode->data);
 		fprintf(fp, "%s%li\n", SONG_MTIME,
 			  (long)((Song *) tempNode->data)->mtime);
 		tempNode = tempNode->nextNode;
diff --git a/src/tag_save.c b/src/tag_save.c
new file mode 100644
index 00000000..dd2bf1ea
--- /dev/null
+++ b/src/tag_save.c
@@ -0,0 +1,35 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "tag_save.h"
+#include "tag.h"
+#include "tag_internal.h"
+#include "song.h"
+
+void tag_save(FILE *file, const struct tag *tag)
+{
+	int i;
+
+	if (tag->time >= 0)
+		fprintf(file, SONG_TIME "%i\n", tag->time);
+
+	for (i = 0; i < tag->numOfItems; i++)
+		fprintf(file, "%s: %s\n",
+			mpdTagItemKeys[tag->items[i]->type],
+			tag->items[i]->value);
+}
diff --git a/src/tag_save.h b/src/tag_save.h
new file mode 100644
index 00000000..648f5975
--- /dev/null
+++ b/src/tag_save.h
@@ -0,0 +1,28 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef TAG_SAVE_H
+#define TAG_SAVE_H
+
+#include "os_compat.h"
+
+struct tag;
+
+void tag_save(FILE *file, const struct tag *tag);
+
+#endif