busybox/archival/libunarchive/seek_by_jump.c

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/* vi: set sw=4 ts=4: */
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/*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <sys/types.h>
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#include <errno.h>
#include <unistd.h>
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#include <stdlib.h>
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#include "libbb.h"
#include "unarchive.h"
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void seek_by_jump(const archive_handle_t *archive_handle, const unsigned int amount)
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{
if (lseek(archive_handle->src_fd, (off_t) amount, SEEK_CUR) == (off_t) -1) {
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#ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
if (errno == ESPIPE) {
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seek_by_read(archive_handle, amount);
} else
#endif
bb_perror_msg_and_die("seek failure");
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}
}