145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/****************************************************************************
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* libs/libc/modlib/modlib_read.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <nuttx/fs/fs.h>
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#include <nuttx/lib/modlib.h>
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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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* Name: modlib_dumpreaddata
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****************************************************************************/
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#if defined(ELF_DUMP_READDATA)
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static inline void modlib_dumpreaddata(FAR char *buffer, int buflen)
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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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# define modlib_dumpreaddata(b,n)
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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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* Name: modlib_read
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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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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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{
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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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binfo("Read %ld bytes from offset %ld\n", (long)readsize, (long)offset);
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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 = _NX_SEEK(loadinfo->filfd, offset, SEEK_SET);
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if (rpos != offset)
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{
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int errval = _NX_GETERRNO(rpos);
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berr("ERROR: Failed to seek to position %lu: %d\n",
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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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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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}
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modlib_dumpreaddata(buffer, readsize);
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return OK;
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}
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