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This is an example of documentation generated by ZigDoc, an alternative to Zig's built-in Auto Doc feature. See also examples in other modes/formats. The project being documented here (as the example) is the Zig standard library. Public Function

peekDelimiterInclusive

Doc Source

Public Function

std.Io.Reader.peekDelimiterInclusive

pub fn peekDelimiterInclusive(r: *Reader, delimiter: u8) DelimiterError![]u8

Returns a slice of the next bytes of buffered data from the stream until delimiter is found, without advancing the seek position.

Returned slice includes the delimiter as the last byte.

Invalidates previously returned values from peek.

Params

r: *Reader
delimiter: u8

Errors

ReadFailed: See the Reader implementation for detailed diagnostics.
EndOfStream: For "inclusive" functions, stream ended before the delimiter was found. For "exclusive" functions, stream ended and there are no more bytes to return.
StreamTooLong: The delimiter was not found within a number of bytes matching the capacity of the Reader.

File

Io/Reader.zig:823

pub fn peekDelimiterInclusive(r: *Reader, delimiter: u8) DelimiterError![]u8 {
    {
        const contents = r.buffer[0..r.end];
        const seek = r.seek;
        if (std.mem.findScalarPos(u8, contents, seek, delimiter)) |end| {
            @branchHint(.likely);
            return contents[seek .. end + 1];
        }
    }
    while (true) {
        const content_len = r.end - r.seek;
        if (r.buffer.len - content_len == 0) break;
        try fillMore(r);
        const seek = r.seek;
        const contents = r.buffer[0..r.end];
        if (std.mem.findScalarPos(u8, contents, seek + content_len, delimiter)) |end| {
            return contents[seek .. end + 1];
        }
    }
    // It might or might not be end of stream. There is no more buffer space
    // left to disambiguate. If `StreamTooLong` was added to `RebaseError` then
    // this logic could be replaced by removing the exit condition from the
    // above while loop. That error code would represent when `buffer` capacity
    // is too small for an operation, replacing the current use of asserts.
    var failing_writer = Writer.failing;
    while (r.vtable.stream(r, &failing_writer, .limited(1))) |n| {
        assert(n == 0);
    } else |err| switch (err) {
        error.WriteFailed => return error.StreamTooLong,
        error.ReadFailed => |e| return e,
        error.EndOfStream => |e| return e,
    }
}