text: /*
   * Amazon FreeRTOS Demo Bootloader V1.4.1
   * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
   *
   * 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.
   *
   * http://aws.amazon.com/freertos
   * http://www.FreeRTOS.org
   */
  
  
  /**
   * @file aws_boot_log.c
   * @brief Bootloader logging utilities.
   */
  
  /* Standard includes.*/
  #include <stdarg.h>
  #include <stddef.h>
  #include <stdint.h>
  
  /* Bootloader includes.*/
  #include "aws_boot_log.h"
  
  /* Print string buffer.*/
  static char cprintBuffer[ BOOT_LOG_PRINT_BUFFER_SIZE ];
  
  /*-----------------------------------------------------------*/
  
  /**
   * @brief Formats a string to be printed and sends it to uart console.
   */
  void BOOT_LOG_Printf( const char * pcFormat,
                        ... )
  {
      size_t xLength = 0;
      int32_t xLength2 = 0;
      va_list args;
  
      /* There are a variable number of parameters. */
      va_start( args, pcFormat );
  
      xLength2 = vsnprintf( cprintBuffer, BOOT_LOG_PRINT_BUFFER_SIZE, pcFormat, args );
  
      if( xLength2 < 0 )
      {
          /* vsnprintf() failed. Restore the terminating NULL
           * character of the first part.*/
          xLength2 = 0;
          cprintBuffer[ xLength ] = '\0';
      }
  
      xLength += ( size_t ) xLength2;
      va_end( args );
  
      if( xLength > 0 )
      {
          BOOT_LOG_UART_Write( cprintBuffer, xLength );
      }
  }
  