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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [libgloss/] [or32/] [write-uart.c] - Blame information for rev 184

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1 180 jeremybenn
/* write-uart.c. Implementation of the _write 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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#include "uart.h"
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extern int  errno;
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/* -------------------------------------------------------------------------- */
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/*!Write a single character to standard output for the UART
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   @param[in] c  The character to write                                       */
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/* -------------------------------------------------------------------------- */
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static void
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outbyte (char  c)
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{
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  _uart_putc (c);
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}       /* outbyte () */
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/* -------------------------------------------------------------------------- */
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/*!Write a buffer to a file.
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   Only output to stdout or stderr is supported, and both of those are
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   directed to the single output stream.
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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 for output.
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   @param[in] buf   The bytes to write.
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   @param[in] nbytes  The number of bytes to write.
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   @return  The number of bytes written on success, or -1 with an error code
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            in the global variable errno on failure.                          */
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/* -------------------------------------------------------------------------- */
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int
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_write (int   file,
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        char *buf,
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        int   nbytes)
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{
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  int i;
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  /* We only handle stdout and stderr */
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  if ((file != STDOUT_FILENO) && (file != STDERR_FILENO))
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    {
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      errno = EBADF;
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      return -1;
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    }
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  /* Output character at at time */
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  for (i = 0; i < nbytes; i++)
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    {
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      outbyte (buf[i]);
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    }
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  return nbytes;
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}       /* _write () */

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