2015-12-10 16:53:31 +01:00
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/****************************************************************************
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2018-05-29 21:21:26 +02:00
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* libs/libc/modlib/modlib_read.c
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2015-12-10 16:53:31 +01:00
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*
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2017-01-29 18:17:29 +01:00
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* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
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2015-12-10 16:53:31 +01:00
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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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* 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 <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <debug.h>
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#include <errno.h>
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2017-10-11 20:13:41 +02:00
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#include <nuttx/fs/fs.h>
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2017-01-29 15:24:42 +01:00
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#include <nuttx/lib/modlib.h>
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2015-12-11 17:55:21 +01:00
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2015-12-10 16:53:31 +01:00
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#undef ELF_DUMP_READDATA /* Define to dump all file data read */
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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2017-01-29 18:17:29 +01:00
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* Name: modlib_dumpreaddata
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2015-12-10 16:53:31 +01:00
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****************************************************************************/
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#if defined(ELF_DUMP_READDATA)
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2017-01-29 18:17:29 +01:00
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static inline void modlib_dumpreaddata(FAR char *buffer, int buflen)
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2015-12-10 16:53:31 +01:00
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{
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FAR uint32_t *buf32 = (FAR uint32_t *)buffer;
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int i;
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int j;
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for (i = 0; i < buflen; i += 32)
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{
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syslog(LOG_DEBUG, "%04x:", i);
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for (j = 0; j < 32; j += sizeof(uint32_t))
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{
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syslog(LOG_DEBUG, " %08x", *buf32++);
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}
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syslog(LOG_DEBUG, "\n");
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}
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}
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#else
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2017-01-29 18:17:29 +01:00
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# define modlib_dumpreaddata(b,n)
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2015-12-10 16:53:31 +01:00
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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2017-01-29 18:17:29 +01:00
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* Name: modlib_read
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2015-12-10 16:53:31 +01:00
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*
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* Description:
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* Read 'readsize' bytes from the object file at 'offset'. The data is
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* read into 'buffer.'
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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2017-01-29 18:17:29 +01:00
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int modlib_read(FAR struct mod_loadinfo_s *loadinfo, FAR uint8_t *buffer,
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size_t readsize, off_t offset)
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2015-12-10 16:53:31 +01:00
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{
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ssize_t nbytes; /* Number of bytes read */
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off_t rpos; /* Position returned by lseek */
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2018-06-01 18:10:17 +02:00
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binfo("Read %ld bytes from offset %ld\n", (long)readsize, (long)offset);
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2015-12-10 16:53:31 +01:00
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/* Loop until all of the requested data has been read. */
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while (readsize > 0)
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{
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/* Seek to the next read position */
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rpos = lseek(loadinfo->filfd, offset, SEEK_SET);
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if (rpos != offset)
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{
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2018-01-31 00:57:36 +01:00
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int errval = get_errno();
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2018-06-01 18:10:17 +02:00
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berr("ERROR: Failed to seek to position %lu: %d\n",
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2015-12-10 16:53:31 +01:00
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(unsigned long)offset, errval);
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return -errval;
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}
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/* Read the file data at offset into the user buffer */
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2020-03-10 06:52:58 +01:00
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nbytes = _NX_READ(loadinfo->filfd, buffer, readsize);
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if (nbytes < 0)
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{
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int errval = _NX_GETERRNO(nbytes);
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/* EINTR just means that we received a signal */
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if (errval != EINTR)
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{
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berr("ERROR: Read from offset %lu failed: %d\n",
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(unsigned long)offset, errval);
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return -errval;
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}
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}
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else if (nbytes == 0)
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{
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berr("ERROR: Unexpected end of file\n");
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return -ENODATA;
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}
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else
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{
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readsize -= nbytes;
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buffer += nbytes;
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offset += nbytes;
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}
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2015-12-10 16:53:31 +01:00
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}
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2017-01-29 18:17:29 +01:00
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modlib_dumpreaddata(buffer, readsize);
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2015-12-10 16:53:31 +01:00
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return OK;
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}
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