/*
 * AWS IoT Jobs v1.3.0
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "jobs_annex.h"

/*
 * This function is a replacement for the function of the same name from jobs.c.
 * Please see jobs.c for documentation.
 */
JobsStatus_t strnAppend( char * buffer,
                         size_t * start,
                         size_t max,
                         const char * value,
                         size_t valueLength )
{
    JobsStatus_t ret = JobsBufferTooSmall;

    assert( ( buffer != NULL ) && ( start != NULL ) && ( value != NULL ) );
    assert( __CPROVER_r_ok( value, valueLength ) );

    if( *start < max )
    {
        size_t free = max - *start;

        assert( __CPROVER_w_ok( ( buffer + *start ), free ) );

        if( valueLength < free )
        {
            *start += valueLength;
            ret = JobsSuccess;
        }
        else
        {
            *start = max;
        }
    }

    return ret;
}