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[/] [ao486/] [trunk/] [syn/] [components/] [sd_card/] [firmware/] [bsp/] [HAL/] [src/] [alt_write.c] - Blame information for rev 8

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1 8 alfik
/******************************************************************************
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*                                                                             *
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* License Agreement                                                           *
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*                                                                             *
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* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *
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* All rights reserved.                                                        *
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*                                                                             *
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* Permission is hereby granted, free of charge, to any person obtaining a     *
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* copy of this software and associated documentation files (the "Software"),  *
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* to deal in the Software without restriction, including without limitation   *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
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* and/or sell copies of the Software, and to permit persons to whom the       *
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* Software is furnished to do so, subject to the following conditions:        *
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*                                                                             *
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* The above copyright notice and this permission notice shall be included in  *
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* all copies or substantial portions of the Software.                         *
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*                                                                             *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
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* DEALINGS IN THE SOFTWARE.                                                   *
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*                                                                             *
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* This agreement shall be governed in all respects by the laws of the State   *
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* of California and by the laws of the United States of America.              *
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*                                                                             *
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* Altera does not recommend, suggest or require that this reference design    *
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* file be used in conjunction or combination with any other product.          *
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******************************************************************************/
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#include <unistd.h>
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#include <fcntl.h>
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#include "sys/alt_errno.h"
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#include "sys/alt_warning.h"
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#include "priv/alt_file.h"
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#include "os/alt_syscall.h"
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#include "sys/alt_log_printf.h"
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/*
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 * The write() system call is used to write a block of data to a file or
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 * device. This function simply vectors the request to the device driver
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 * associated with the input file descriptor "file".
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 *
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 * ALT_WRITE is mapped onto the write() system call in alt_syscall.h
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 */
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#ifdef ALT_USE_DIRECT_DRIVERS
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#include "system.h"
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#include "sys/alt_driver.h"
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/*
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 * Provide minimal version that just writes to the stdout/stderr devices
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 * when provided.
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 */
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int ALT_WRITE (int file, const void *ptr, size_t len)
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{
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#ifdef ALT_STDOUT_PRESENT
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    ALT_DRIVER_WRITE_EXTERNS(ALT_STDOUT_DEV);
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#endif
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#ifdef ALT_STDERR_PRESENT
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    ALT_DRIVER_WRITE_EXTERNS(ALT_STDERR_DEV);
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#endif
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#if !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT)
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    /* Generate a link time warning, should this function ever be called. */
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    ALT_STUB_WARNING(write);
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#endif
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    switch (file) {
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#ifdef ALT_STDOUT_PRESENT
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    case 1: /* stdout file descriptor */
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        return ALT_DRIVER_WRITE(ALT_STDOUT_DEV, ptr, len, 0);
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#endif /* ALT_STDOUT_PRESENT */
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#ifdef ALT_STDERR_PRESENT
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    case 2: /* stderr file descriptor */
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        return ALT_DRIVER_WRITE(ALT_STDERR_DEV, ptr, len, 0);
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#endif /* ALT_STDERR_PRESENT */
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    default:
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        ALT_ERRNO = EBADFD;
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        return -1;
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    }
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}
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#else /* !ALT_USE_DIRECT_DRIVERS */
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int ALT_WRITE (int file, const void *ptr, size_t len)
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{
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  alt_fd*  fd;
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  int      rval;
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  /*
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   * A common error case is that when the file descriptor was created, the call
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   * to open() failed resulting in a negative file descriptor. This is trapped
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   * below so that we don't try and process an invalid file descriptor.
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   */
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  fd = (file < 0) ? NULL : &alt_fd_list[file];
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  if (fd)
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  {
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    /*
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     * If the file has not been opened with write access, or if the driver does
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     * not provide an implementation of write(), generate an error. Otherwise
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     * call the drivers write() function to process the request.
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     */
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    if (((fd->fd_flags & O_ACCMODE) != O_RDONLY) && fd->dev->write)
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    {
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      /* ALT_LOG - see altera_hal/HAL/inc/sys/alt_log_printf.h */
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      ALT_LOG_WRITE_FUNCTION(ptr,len);
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      if ((rval = fd->dev->write(fd, ptr, len)) < 0)
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      {
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        ALT_ERRNO = -rval;
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        return -1;
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      }
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      return rval;
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    }
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    else
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    {
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      ALT_ERRNO = EACCES;
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    }
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  }
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  else
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  {
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    ALT_ERRNO = EBADFD;
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  }
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  return -1;
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}
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#endif /* ALT_USE_DIRECT_DRIVERS */

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