Github user necouchman commented on a diff in the pull request:

    https://github.com/apache/guacamole-server/pull/156#discussion_r176917418
  
    --- Diff: src/protocols/ssh/ttymode.c ---
    @@ -0,0 +1,59 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *   http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + */
    +
    +#include "config.h"
    +#include "ttymode.h"
    +
    +#include <stdarg.h>
    +#include <stdlib.h>
    +#include <string.h>
    +
    +int guac_ssh_ttymodes_init(char opcode_array[], const int array_size,
    +        const int num_opcodes, ...) {
    +
    +    /* Initialize the variable argument list. */
    +    va_list args;
    +    va_start(args, num_opcodes);
    +
    +    /* Check to make sure the array has enough space.
    +       We need one extra byte at the end for the ending opcode. */
    +    if ((num_opcodes * GUAC_SSH_TTY_OPCODE_SIZE) >= (array_size))
    +        return 1;
    +
    +    for (int i = 0; i < num_opcodes; i++) {
    +        /* Calculate offset in array */
    +        int offset = i * GUAC_SSH_TTY_OPCODE_SIZE;
    +
    +        /* Get the next argument to this function */
    +        guac_ssh_ttymode ttymode = va_arg(args, guac_ssh_ttymode);
    --- End diff --
    
    Is it possible to do this by pointer/reference rather than value?  I'm not 
familiar with the va_arg macro and how to use it - do I just change the 
argument to `&guac_ssh_ttymode` and the assignment to `guac_ssh_ttymode* 
ttymode`?


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