1 files changed, 76 insertions, 0 deletions
diff --git a/bdb/os/os_seek.c b/bdb/os/os_seek.c
new file mode 100644
index 00000000000..1c4dc2238e1
--- /dev/null
+++ b/bdb/os/os_seek.c
@@ -0,0 +1,76 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997, 1998, 1999, 2000
+ *	Sleepycat Software.  All rights reserved.
+ */
+
+#include "db_config.h"
+
+#ifndef lint
+static const char revid[] = "$Id: os_seek.c,v 11.12 2000/11/30 00:58:42 ubell Exp $";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#endif
+
+#include "db_int.h"
+#include "os_jump.h"
+
+/*
+ * __os_seek --
+ *	Seek to a page/byte offset in the file.
+ *
+ * PUBLIC: int __os_seek __P((DB_ENV *,
+ * PUBLIC:      DB_FH *, size_t, db_pgno_t, u_int32_t, int, DB_OS_SEEK));
+ */
+int
+__os_seek(dbenv, fhp, pgsize, pageno, relative, isrewind, db_whence)
+	DB_ENV *dbenv;
+	DB_FH *fhp;
+	size_t pgsize;
+	db_pgno_t pageno;
+	u_int32_t relative;
+	int isrewind;
+	DB_OS_SEEK db_whence;
+{
+	off_t offset;
+	int ret, whence;
+
+	switch (db_whence) {
+	case DB_OS_SEEK_CUR:
+		whence = SEEK_CUR;
+		break;
+	case DB_OS_SEEK_END:
+		whence = SEEK_END;
+		break;
+	case DB_OS_SEEK_SET:
+		whence = SEEK_SET;
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	if (__db_jump.j_seek != NULL)
+		ret = __db_jump.j_seek(fhp->fd,
+		    pgsize, pageno, relative, isrewind, whence);
+	else {
+		offset = (off_t)pgsize * pageno + relative;
+		if (isrewind)
+			offset = -offset;
+		ret =
+		    lseek(fhp->fd, offset, whence) == -1 ? __os_get_errno() : 0;
+	}
+
+	if (ret != 0)
+		__db_err(dbenv, "seek: %lu %d %d: %s",
+		    (u_long)pgsize * pageno + relative,
+		    isrewind, db_whence, strerror(ret));
+
+	return (ret);
+}