1 files changed, 50 insertions, 0 deletions
diff --git a/lib/libdisk/blocks.c b/lib/libdisk/blocks.c
new file mode 100644
index 0000000..313c5cc
--- /dev/null
+++ b/lib/libdisk/blocks.c
@@ -0,0 +1,50 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "libdisk.h"
+
+void *
+read_block(int fd, daddr_t block, u_long sector_size)
+{
+	void *foo;
+	int i;
+
+	foo = malloc(sector_size);
+	if (foo == NULL)
+		return (NULL);
+	if (-1 == lseek(fd, (off_t)block * sector_size, SEEK_SET)) {
+		free (foo);
+		return (NULL);
+	}
+	i = read(fd, foo, sector_size);
+	if ((int)sector_size != i) {
+		free (foo);
+		return (NULL);
+	}
+	return foo;
+}
+
+int
+write_block(int fd, daddr_t block, const void *foo, u_long sector_size)
+{
+	int i;
+
+	if (-1 == lseek(fd, (off_t)block * sector_size, SEEK_SET))
+		return (-1);
+	i = write(fd, foo, sector_size);
+	if ((int)sector_size != i)
+		return (-1);
+	return 0;
+}