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std.fs.File.Reader: only fcopyfile if size available

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This commit is contained in:
Andrew Kelley
2025-07-20 20:46:07 -07:00
parent 38559e282b
commit fe10c66d66
1 changed files with 4 additions and 4 deletions
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8
lib/std/fs/File.zig
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@@ -1825,6 +1825,7 @@ pub const Writer = struct {
if (file_reader.pos != 0) break :fcf;
if (w.pos != 0) break :fcf;
if (limit != .unlimited) break :fcf;
const size = file_reader.getSize() catch break :fcf;
const rc = std.c.fcopyfile(in_fd, out_fd, null, .{ .DATA = true });
switch (posix.errno(rc)) {
.SUCCESS => {},
@@ -1845,10 +1846,9 @@ pub const Writer = struct {
return 0;
},
}
const n = if (file_reader.size) |size| size else @panic("TODO figure out how much copied");
file_reader.pos = n;
w.pos = n;
return n;
file_reader.pos = size;
w.pos = size;
return size;
}
return error.Unimplemented;