busybox/archival/libunarchive/seek_by_jump.c

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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
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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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extern 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) {
#if CONFIG_FEATURE_UNARCHIVE_TAPE
if (errno == ESPIPE) {
seek_by_char(archive_handle, amount);
} else
#endif
perror_msg_and_die("Seek failure");
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}
}