attempt to regularize atoi mess.

archival/libunarchive/seek_by_read.c

@@ -0,0 +1,19 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <stdlib.h>
+
+#include "unarchive.h"
+#include "libbb.h"
+
+/*  If we are reading through a pipe(), or from stdin then we cant lseek,
+ *  we must read and discard the data to skip over it.
+ */
+void seek_by_read(const archive_handle_t *archive_handle, const unsigned int jump_size)
+{
+	if (jump_size) {
+		bb_copyfd_size(archive_handle->src_fd, -1, jump_size);
+	}
+}