text: /*
   * File     : stdio.c
   * Brief    : stdio/console
   *
   * This file is part of RT-Thread RTOS
   * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Change Logs:
   * Date           Author       Notes
   * 2017/10/15     bernard      implement stdio for armcc.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <rtthread.h>
  #include "libc.h"
  
  #if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
  #include <dfs_posix.h>
  
  #define STDIO_DEVICE_NAME_MAX   32
  
  static int std_fd = -1;
  int libc_stdio_set_console(const char* device_name, int mode)
  {
      int fd;
      char name[STDIO_DEVICE_NAME_MAX];
  
      snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
      name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
  
      fd = open(name, mode, 0);
      if (fd >= 0)
      {
          if (std_fd >= 0)
          {
              close(std_fd);
          }
          std_fd = fd;
      }
  
      return std_fd;
  }
  
  int libc_stdio_get_console(void)
  {
      return std_fd;
  }
  
  int libc_stdio_read(void *buffer, size_t size)
  {
      return read(std_fd, buffer, size);
  }
  
  int libc_stdio_write(const void *buffer, size_t size)
  {
      return write(std_fd, buffer, size);
  }
  #endif
  