diff options
Diffstat (limited to 'nuttx/fs/nxffs/nxffs_write.c')
-rw-r--r-- | nuttx/fs/nxffs/nxffs_write.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/nuttx/fs/nxffs/nxffs_write.c b/nuttx/fs/nxffs/nxffs_write.c new file mode 100644 index 000000000..363a1d60f --- /dev/null +++ b/nuttx/fs/nxffs/nxffs_write.c @@ -0,0 +1,147 @@ +/**************************************************************************** + * fs/nxffs/nxffs_write.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * References: Linux/Documentation/filesystems/romfs.txt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <string.h> +#include <fcntl.h> +#include <assert.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/fs.h> +#include <nuttx/mtd.h> + +#include "nxffs.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nxffs_write + * + * Description: + * This is an implementation of the NuttX standard file system write + * method. + * + ****************************************************************************/ + +ssize_t nxffs_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) +{ + FAR struct nxffs_volume_s *volume; + FAR struct nxffs_wrfile_s *wrfile; + ssize_t ret; + + fvdbg("Write %d bytes to offset %d\n", buflen, filep->f_pos); + + /* Sanity checks */ + + DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL); + + /* Recover the open file state from the struct file instance */ + + wrfile = (FAR struct nxffs_wrfile_s *)filep->f_priv; + + /* Recover the volume state from the open file */ + + volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private; + DEBUGASSERT(volume != NULL); + + /* Get exclusive access to the volume. Note that the volume exclsem + * protects the open file list. + */ + + ret = sem_wait(&volume->exclsem); + if (ret != OK) + { + ret = -errno; + fdbg("sem_wait failed: %d\n", ret); + goto errout; + } + + /* Check if the file was opened with write access */ + +#ifdef CONFIG_DEBUG + if ((wrfile->ofile.mode & O_WROK) == 0) + { + fdbg("File not open for write access\n"); + ret = -EACCES; + goto errout_with_semaphore; + } +#endif + + /* Seek to the current file offset */ + + nxffs_ioseek(volume, wrfile->dathdr + wrfile->wrlen); + + /* Write data to that file offset */ + + ret = nxffs_wrdata(volume, (FAR const uint8_t*)buffer, buflen); + if (ret > 0) + { + /* Update the file offset */ + + filep->f_pos += ret; + } +#warning "Add check for block full" + +errout_with_semaphore: + sem_post(&volume->exclsem); +errout: + return ret; +} |