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Todd C. Miller a27b989c9c Check for negative return value of read, write and lseek instead of -1
The return values are used in ways that assume they are positive.
In practice, it is not possible to have a negative return value
other than -1 due to the size of the buffers being read from or
written to.  Also add overflow checks when updating the buffer len.
Quiets several coverity warnings.
2025-01-16 19:46:15 -07:00
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