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Diff for /src/usr.bin/xinstall/xinstall.c between version 1.44 and 1.45

version 1.44, 2007/05/16 17:33:07 version 1.45, 2007/05/25 20:32:29
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  *      uses lseek whenever it detects the input data is all 0 within that   *      uses lseek whenever it detects the input data is all 0 within that
  *      file block. In more detail, the strategy is as follows:   *      file block. In more detail, the strategy is as follows:
  *      While the input is all zero keep doing an lseek. Keep track of when we   *      While the input is all zero keep doing an lseek. Keep track of when we
  *      pass over file block boundries. Only write when we hit a non zero   *      pass over file block boundaries. Only write when we hit a non zero
  *      input. once we have written a file block, we continue to write it to   *      input. once we have written a file block, we continue to write it to
  *      the end (we stop looking at the input). When we reach the start of the   *      the end (we stop looking at the input). When we reach the start of the
  *      next file block, start checking for zero blocks again. Working on file   *      next file block, start checking for zero blocks again. Working on file
  *      block boundries significantly reduces the overhead when copying files   *      block boundaries significantly reduces the overhead when copying files
  *      that are NOT very sparse. This overhead (when compared to a write) is   *      that are NOT very sparse. This overhead (when compared to a write) is
  *      almost below the measurement resolution on many systems. Without it,   *      almost below the measurement resolution on many systems. Without it,
  *      files with holes cannot be safely copied. It does has a side effect as   *      files with holes cannot be safely copied. It does has a side effect as
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