text: /******************************************************************************
  *                                                                             *
  * License Agreement                                                           *
  *                                                                             *
  * Copyright (c) 2015 Altera Corporation, San Jose, California, USA.           *
  * 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.                                                   *
  *                                                                             *
  * This agreement shall be governed in all respects by the laws of the State   *
  * of California and by the laws of the United States of America.              *
  *                                                                             *
  * Altera does not recommend, suggest or require that this reference design    *
  * file be used in conjunction or combination with any other product.          *
  ******************************************************************************/
  
  #include <stdio.h>
  
  #ifdef ALT_USE_DIRECT_DRIVERS
  #include "system.h"
  #include "sys/alt_driver.h"
  #include "sys/alt_stdio.h"
  #endif
  #ifdef ALT_SEMIHOSTING
  #include "sys/alt_stdio.h"
  #include "unistd.h"
  #endif
  
  /*
   * Uses the ALT_DRIVER_WRITE() macro to call directly to driver if available.
   * Otherwise, uses newlib provided putchar() routine.
   */
  int 
  alt_putchar(int c)
  {
  #ifdef ALT_SEMIHOSTING
  	char        c1 = (char)(c & 0xff);
      return write(STDOUT_FILENO,&c1,1);
  #else
  #ifdef ALT_USE_DIRECT_DRIVERS
      ALT_DRIVER_WRITE_EXTERNS(ALT_STDOUT_DEV);
      char        c1 = (char)(c & 0xff);
  
      if (ALT_DRIVER_WRITE(ALT_STDOUT_DEV, &c1, 1, 0) == -1) {
          return -1;
      }
      return c;
  #else
      return putchar(c);
  #endif
  #endif
  }
  