70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* Copyright (c) 1995-2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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
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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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*
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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 the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "common.h"
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#include <stdio.h>
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#include <err.h>
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#include "roken.h"
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RCSID("$Id: buffer.c,v 1.4 2000/10/23 04:49:25 joda Exp $");
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/*
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* Allocate a buffer enough to handle st->st_blksize, if
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* there is such a field, otherwise BUFSIZ.
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*/
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void *
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alloc_buffer (void *oldbuf, size_t *sz, struct stat *st)
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{
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size_t new_sz;
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new_sz = BUFSIZ;
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#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
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if (st)
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new_sz = max(BUFSIZ, st->st_blksize);
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#endif
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if(new_sz > *sz) {
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if (oldbuf)
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free (oldbuf);
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oldbuf = malloc (new_sz);
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if (oldbuf == NULL) {
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warn ("malloc");
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*sz = 0;
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return NULL;
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}
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*sz = new_sz;
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}
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return oldbuf;
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}
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