pub fn fixedDrain(w: *Writer, data: []const []const u8, splat: usize) Error!usizew: *Writerdata: []const []const u8splat: usizeWriteFailedSee the Writer implementation for detailed diagnostics.
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2466pub fn fixedDrain(w: *Writer, data: []const []const u8, splat: usize) Error!usize {
if (data.len == 0) return 0;
for (data[0 .. data.len - 1]) |bytes| {
const dest = w.buffer[w.end..];
const len = @min(bytes.len, dest.len);
@memcpy(dest[0..len], bytes[0..len]);
w.end += len;
if (bytes.len > dest.len) return error.WriteFailed;
}
const pattern = data[data.len - 1];
const dest = w.buffer[w.end..];
switch (pattern.len) {
0 => return 0,
1 => {
assert(splat >= dest.len);
@memset(dest, pattern[0]);
w.end += dest.len;
return error.WriteFailed;
},
else => {
for (0..splat) |i| {
const remaining = dest[i * pattern.len ..];
const len = @min(pattern.len, remaining.len);
@memcpy(remaining[0..len], pattern[0..len]);
w.end += len;
if (pattern.len > remaining.len) return error.WriteFailed;
}
unreachable;
},
}
}
When this function is called it usually means the buffer got full, so it's time to return an error. However, we still need to make sure all of the available buffer has been filled. Also, it may be called from
flushin which case it should return successfully.