u-tools/apps/busybox/archival/libunarchive/seek_by_jump.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   4  */
   5
   6 #include "libbb.h"
   7 #include "unarchive.h"
   8
   9 void FAST_FUNC seek_by_jump(const archive_handle_t *archive_handle, unsigned amount)
  10 {
  11         if (amount
  12          && lseek(archive_handle->src_fd, (off_t) amount, SEEK_CUR) == (off_t) -1
  13         ) {
  14                 if (errno == ESPIPE)
  15                         seek_by_read(archive_handle, amount);
  16                 else
  17                         bb_perror_msg_and_die("seek failure");
  18         }
  19 }