From 38a33f91c0a46f51d07900731245492a3b244ae4 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Mon, 9 May 2005 22:13:22 +0000
Subject: import more libs to prep for new e2fsprogs

---
 e2fsprogs/blkid/dev.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 e2fsprogs/blkid/dev.c

(limited to 'e2fsprogs/blkid/dev.c')

diff --git a/e2fsprogs/blkid/dev.c b/e2fsprogs/blkid/dev.c
new file mode 100644
index 000000000..23af8878d
--- /dev/null
+++ b/e2fsprogs/blkid/dev.c
@@ -0,0 +1,118 @@
+/*
+ * dev.c - allocation/initialization/free routines for dev
+ *
+ * Copyright (C) 2001 Andreas Dilger
+ * Copyright (C) 2003 Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ * %End-Header%
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "blkidP.h"
+
+blkid_dev blkid_new_dev(void)
+{
+	blkid_dev dev;
+
+	if (!(dev = (blkid_dev) calloc(1, sizeof(struct blkid_struct_dev))))
+		return NULL;
+
+	INIT_LIST_HEAD(&dev->bid_devs);
+	INIT_LIST_HEAD(&dev->bid_tags);
+
+	return dev;
+}
+
+void blkid_free_dev(blkid_dev dev)
+{
+	if (!dev)
+		return;
+
+	DBG(DEBUG_DEV,
+	    printf("  freeing dev %s (%s)\n", dev->bid_name, dev->bid_type));
+	DEB_DUMP_DEV(DEBUG_DEV, dev);
+
+	list_del(&dev->bid_devs);
+	while (!list_empty(&dev->bid_tags)) {
+		blkid_tag tag = list_entry(dev->bid_tags.next,
+					   struct blkid_struct_tag,
+					   bit_tags);
+		blkid_free_tag(tag);
+	}
+	if (dev->bid_name)
+		free(dev->bid_name);
+	free(dev);
+}
+
+/*
+ * Given a blkid device, return its name
+ */
+extern const char *blkid_dev_devname(blkid_dev dev)
+{
+	return dev->bid_name;
+}
+
+/*
+ * dev iteration routines for the public libblkid interface.
+ *
+ * These routines do not expose the list.h implementation, which are a
+ * contamination of the namespace, and which force us to reveal far, far
+ * too much of our internal implemenation.  I'm not convinced I want
+ * to keep list.h in the long term, anyway.  It's fine for kernel
+ * programming, but performance is not the #1 priority for this
+ * library, and I really don't like the tradeoff of type-safety for
+ * performance for this application.  [tytso:20030125.2007EST]
+ */
+
+/*
+ * This series of functions iterate over all devices in a blkid cache
+ */
+#define DEV_ITERATE_MAGIC	0x01a5284c
+	
+struct blkid_struct_dev_iterate {
+	int			magic;
+	blkid_cache		cache;
+	struct list_head	*p;
+};
+
+extern blkid_dev_iterate blkid_dev_iterate_begin(blkid_cache cache)
+{
+	blkid_dev_iterate	iter;
+
+	iter = malloc(sizeof(struct blkid_struct_dev_iterate));
+	if (iter) {
+		iter->magic = DEV_ITERATE_MAGIC;
+		iter->cache = cache;
+		iter->p	= cache->bic_devs.next;
+	}
+	return (iter);
+}
+
+/*
+ * Return 0 on success, -1 on error
+ */
+extern int blkid_dev_next(blkid_dev_iterate iter,
+			  blkid_dev *dev)
+{
+	*dev = 0;
+	if (!iter || iter->magic != DEV_ITERATE_MAGIC ||
+	    iter->p == &iter->cache->bic_devs)
+		return -1;
+	*dev = list_entry(iter->p, struct blkid_struct_dev, bid_devs);
+	iter->p = iter->p->next;
+	return 0;
+}
+
+extern void blkid_dev_iterate_end(blkid_dev_iterate iter)
+{
+	if (!iter || iter->magic != DEV_ITERATE_MAGIC)
+		return;
+	iter->magic = 0;
+	free(iter);
+}
+
-- 
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