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110 lines
4.0 KiB
110 lines
4.0 KiB
/**************************************************************************** |
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* examples/pashello/device.c |
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* |
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* Copyright (C) 2008, 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Compilation Switches |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <sys/types.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <nuttx/fs/fs.h> |
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#include "hello.h" |
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#include "pashello.h" |
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/**************************************************************************** |
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* Private Function Prototypes |
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****************************************************************************/ |
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static ssize_t hello_read(struct file *, char *, size_t); |
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/**************************************************************************** |
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* Private Data |
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****************************************************************************/ |
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static const struct file_operations hello_fops = |
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{ |
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0, /* open */ |
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0, /* close */ |
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hello_read, /* read */ |
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0, /* write */ |
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0, /* seek */ |
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0, /* ioctl */ |
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#ifndef CONFIG_DISABLE_POLL |
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0 /* poll */ |
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#endif |
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}; |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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static ssize_t hello_read(struct file *filep, char *buffer, size_t len) |
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{ |
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off_t offset = filep->f_pos; /* Start read position */ |
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ssize_t nread = 0; /* Bytes read -- assume EOF */ |
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/* Make sure that the offset is within the .pex file */ |
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if (offset < hello_pex_len) |
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{ |
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/* Make sure the read does not extend beyond the .pex file */ |
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nread = len; |
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if (nread + offset > hello_pex_len) |
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{ |
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nread = hello_pex_len - offset; |
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} |
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memcpy(buffer, &hello_pex[offset], nread); |
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filep->f_pos += nread; |
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} |
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return nread; |
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} |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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void hello_register(void) |
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{ |
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(void)register_driver("/dev/hello", &hello_fops, 0444, NULL); |
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}
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