busybox/archival/libunarchive/seek_by_jump.c

/* vi: set sw=4 ts=4: */
/*
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>

#include "libbb.h"
#include "unarchive.h"

void seek_by_jump(const archive_handle_t *archive_handle, const unsigned int amount)
{
	if (lseek(archive_handle->src_fd, (off_t) amount, SEEK_CUR) == (off_t) -1) {
#ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
		if (errno == ESPIPE) {
			seek_by_char(archive_handle, amount);
		} else
#endif
			bb_perror_msg_and_die("Seek failure");
	}
}