125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/****************************************************************************
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* libc/modlib/modlib_iobuffer.c
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*
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* Copyright (C) 2015, 2017 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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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/module.h>
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#include <nuttx/lib/modlib.h>
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#include "libc.h"
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#include "modlib/modlib.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: modlib_allocbuffer
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*
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* Description:
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* Perform the initial allocation of the I/O buffer, if it has not already
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* been allocated.
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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_allocbuffer(FAR struct mod_loadinfo_s *loadinfo)
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{
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/* Has a buffer been allocated> */
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if (!loadinfo->iobuffer)
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{
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/* No.. allocate one now */
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loadinfo->iobuffer = (FAR uint8_t *)lib_malloc(CONFIG_MODLIB_BUFFERSIZE);
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if (!loadinfo->iobuffer)
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{
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serr("ERROR: Failed to allocate an I/O buffer\n");
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return -ENOMEM;
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}
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loadinfo->buflen = CONFIG_MODLIB_BUFFERSIZE;
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}
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return OK;
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}
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/****************************************************************************
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* Name: modlib_reallocbuffer
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*
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* Description:
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* Increase the size of I/O buffer by the specified buffer increment.
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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_reallocbuffer(FAR struct mod_loadinfo_s *loadinfo, size_t increment)
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{
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FAR void *buffer;
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size_t newsize;
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/* Get the new size of the allocation */
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newsize = loadinfo->buflen + increment;
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/* And perform the reallocation */
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buffer = lib_realloc((FAR void *)loadinfo->iobuffer, newsize);
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if (!buffer)
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{
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serr("ERROR: Failed to reallocate the I/O buffer\n");
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return -ENOMEM;
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}
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/* Save the new buffer info */
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loadinfo->iobuffer = buffer;
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loadinfo->buflen = newsize;
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return OK;
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}
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