1 files changed, 53 insertions, 0 deletions
diff --git a/package/heirloom-cpio/src/ib_seek.c b/package/heirloom-cpio/src/ib_seek.c
new file mode 100644
index 000000000..48b2f99bc
--- /dev/null
+++ b/package/heirloom-cpio/src/ib_seek.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2003 Gunnar Ritter
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute
+ * it freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ *
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ *
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+/*	Sccsid @(#)ib_seek.c	1.4 (gritter) 5/8/03	*/
+
+#include	<sys/types.h>
+#include	<sys/stat.h>
+#include	<fcntl.h>
+#include	<unistd.h>
+#include	<string.h>
+#include	<errno.h>
+#include	<stdlib.h>
+
+#include	"iblok.h"
+
+off_t
+ib_seek(struct iblok *ip, off_t off, int whence)
+{
+	if (whence == SEEK_CUR) {
+		off = ip->ib_endoff - (ip->ib_end - ip->ib_cur);
+		whence = SEEK_SET;
+	}
+	if (ip->ib_seekable && whence == SEEK_SET && ip->ib_cur && ip->ib_end &&
+			off < ip->ib_endoff &&
+			off >= ip->ib_endoff - (ip->ib_end - ip->ib_blk)) {
+		ip->ib_cur = ip->ib_end - (ip->ib_endoff - off);
+		return off;
+	}
+	if ((off = lseek(ip->ib_fd, off, whence)) == (off_t)-1)
+		return -1;
+	ip->ib_cur = ip->ib_end = NULL;
+	ip->ib_endoff = off;
+	ip->ib_seekable = 1;
+	return off;
+}