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182 lines
8.2 KiB
182 lines
8.2 KiB
/***************************************************************************/
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/* */
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/* Project: OpenSLP - OpenSource implementation of Service Location */
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/* Protocol */
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/* */
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/* File: slp_buffer.c */
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/* */
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/* Abstract: Header file that defines structures and constants that are */
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/* are used to control memory allocation in OpenSLP */
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/* */
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/*-------------------------------------------------------------------------*/
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/* */
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/* Please submit patches to http://www.openslp.org */
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/* */
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/*-------------------------------------------------------------------------*/
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/* */
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/* Copyright (C) 2000 Caldera Systems, Inc */
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/* All rights reserved. */
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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 are */
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/* met: */
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/* */
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/* 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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/* */
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/* 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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/* */
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/* Neither the name of Caldera Systems nor the names of its */
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/* contributors may be used to endorse or promote products derived */
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/* from this software 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 FOR */
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/* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE CALDERA */
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/* SYSTEMS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
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/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
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/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
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/* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/***************************************************************************/
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#include "slp_buffer.h"
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#include "slp_xmalloc.h"
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/*=========================================================================*/
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void* memdup(const void* src, int srclen)
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/* Generic memdup analogous to strdup() */
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/*=========================================================================*/
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{
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char* result;
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result = (unsigned char*)xmalloc(srclen);
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if(result)
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{
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memcpy(result,src,srclen);
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}
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return result;
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}
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/*=========================================================================*/
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SLPBuffer SLPBufferAlloc(size_t size)
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/* Must be called to initially allocate a SLPBuffer */
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/* */
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/* size - (IN) number of bytes to reallocate */
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/* */
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/* returns - newly allocated SLPBuffer or NULL on ENOMEM. An extra byte */
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/* is allocated to null terminating strings. This extra byte */
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/* is not counted in the buffer size */
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/*=========================================================================*/
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{
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SLPBuffer result;
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/* allocate an extra byte for null terminating strings */
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result = (SLPBuffer)xmalloc(sizeof(struct _SLPBuffer) + size + 1);
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if(result)
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{
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result->allocated = size;
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result->start = (unsigned char*)(result + 1);
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result->curpos = result->start;
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result->end = result->start + size;
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#if(defined DEBUG)
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memset(result->start,0x4d,size + 1);
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#endif
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}
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return result;
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}
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/*=========================================================================*/
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SLPBuffer SLPBufferRealloc(SLPBuffer buf, size_t size)
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/* Must be called to initially allocate a SLPBuffer */
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/* */
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/* size - (IN) number of bytes to allocate */
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/* */
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/* returns - newly (re)allocated SLPBuffer or NULL on ENOMEM. An extra */
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/* byte is allocated to null terminating strings. This extra */
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/* byte is not counted in the buffer size */
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/*=========================================================================*/
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{
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SLPBuffer result;
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if(buf)
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{
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if(buf->allocated >= size)
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{
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result = buf;
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}
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else
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{
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/* allocate an extra byte for null terminating strings */
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result = (SLPBuffer)xrealloc(buf, sizeof(struct _SLPBuffer) +
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size + 1);
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result->allocated = size;
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}
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if(result)
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{
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result->start = (unsigned char*)(result + 1);
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result->curpos = result->start;
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result->end = result->start + size;
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#if(defined DEBUG)
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memset(result->start,0x4d,size + 1);
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#endif
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}
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}
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else
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{
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result = SLPBufferAlloc(size);
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}
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return result;
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}
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/*=========================================================================*/
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SLPBuffer SLPBufferDup(SLPBuffer buf)
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/* Returns a duplicate buffer. Duplicate buffer must be freed by a call */
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/* to SLPBufferFree() */
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/* */
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/* size - (IN) number of bytes to allocate */
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/* */
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/* returns - a newly allocated SLPBuffer or NULL on ENOMEM */
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/*=========================================================================*/
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{
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SLPBuffer dup;
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dup = SLPBufferAlloc(buf->end - buf->start);
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if(dup)
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{
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memcpy(dup->start,buf->start,buf->end - buf->start);
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}
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return dup;
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}
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/*=========================================================================*/
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void SLPBufferFree(SLPBuffer buf)
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/* Free a previously allocated SLPBuffer */
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/* */
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/* msg - (IN) the SLPBuffer to free */
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/* */
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/* returns - none */
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/*=========================================================================*/
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{
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if(buf)
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{
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xfree(buf);
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}
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}
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