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Diffstat (limited to 'apps/examples/pashello/device.c')
-rw-r--r-- | apps/examples/pashello/device.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/apps/examples/pashello/device.c b/apps/examples/pashello/device.c new file mode 100644 index 000000000..a3950e6a3 --- /dev/null +++ b/apps/examples/pashello/device.c @@ -0,0 +1,110 @@ +/**************************************************************************** + * examples/pashello/device.c + * + * Copyright (C) 2008, 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Compilation Switches + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <string.h> +#include <errno.h> +#include <nuttx/fs/fs.h> + +#include "hello.h" +#include "pashello.h" + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static ssize_t hello_read(struct file *, char *, size_t); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static const struct file_operations hello_fops = +{ + 0, /* open */ + 0, /* close */ + hello_read, /* read */ + 0, /* write */ + 0, /* seek */ + 0, /* ioctl */ +#ifndef CONFIG_DISABLE_POLL + 0 /* poll */ +#endif +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static ssize_t hello_read(struct file *filep, char *buffer, size_t len) +{ + off_t offset = filep->f_pos; /* Start read position */ + ssize_t nread = 0; /* Bytes read -- assume EOF */ + + /* Make sure that the offset is within the .pex file */ + + if (offset < hello_pex_len) + { + /* Make sure the read does not extend beyond the .pex file */ + + nread = len; + if (nread + offset > hello_pex_len) + { + nread = hello_pex_len - offset; + } + memcpy(buffer, &hello_pex[offset], nread); + filep->f_pos += nread; + } + return nread; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +void hello_register(void) +{ + (void)register_driver("/dev/hello", &hello_fops, 0444, NULL); +} |