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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [libgloss/] [or32/] [read-uart.c] - Blame information for rev 180

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1 180 jeremybenn
/* read-uart.c. Implementation of the _read syscall for newlib with UART.
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   Copyright (C) 2004, Jacob Bower
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   Copyright (C) 2010, Embecosm Limited <info@embecosm.com>
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   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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   This file is part of Newlib.
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   The original work by Jacob Bower is provided as-is without any kind of
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   warranty. Use it at your own risk!
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   All subsequent work is bound by version 3 of the GPL as follows.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 3 of the License, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   You should have received a copy of the GNU General Public License along
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   with this program.  If not, see <http:#www.gnu.org/licenses/>.             */
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/* -------------------------------------------------------------------------- */
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/* This program is commented throughout in a fashion suitable for processing
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   with Doxygen.                                                              */
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/* -------------------------------------------------------------------------- */
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#include <errno.h>
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#include <unistd.h>
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extern int  errno;
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/* -------------------------------------------------------------------------- */
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/*!Read from a file with a UART.
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   We only support reading from stdin.
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   Remember that this function is *not* reentrant, so no static state should
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   be held.
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   @param[in] file  The fileno to read.
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   @param[in] buf   Buffer into which to read.
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   @param[in] len   Number of bytes to read.
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   @return  number of bytes read if the file is stdin, otherwise -1 to
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            indicate failure, with an error code in the global variable
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            errno.                                                            */
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/* -------------------------------------------------------------------------- */
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int
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_read (int   file,
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       char *buf,
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       int   len)
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{
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  if (STDIN_FILENO == file)
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    {
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      int  i;
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      for (i = 0; i < len; i++)
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        {
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          buf[i] = _uart_getc ();
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#ifdef UART_AUTO_ECHO
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          _uart_putc (buf[i]);
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#endif
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          if (('\n' == buf[i]) || ('\r' == buf[i]))
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            {
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              buf[i] = 0;                /* End of string */
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              return  i;
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            }
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        }
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      return  i;                        /* Filled the buffer */
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    }
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  else
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    {
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      errno = EBADF;
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      return  -1;
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    }
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}       /* _read () */

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