Andrew Kelley e098b287e1 std.fs.File.writevAll: fix behavior for 0-length vectors
The OS layer expects pointer addresses to be inside the application's
address space even if the length is zero. Meanwhile, in Zig, slices may
have undefined pointer addresses when the length is zero. So this
function now modifies the iov_base fields when the length is zero.

This is a companion commit to b4893eb05565b2cb033c6ed88617d73faf878455.
2023-03-15 10:48:15 -07:00
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