freebsd-dev/crypto/kerberosIV/appl/ftp/common/buffer.c
1999-09-19 14:19:32 +00:00

75 lines
2.5 KiB
C

/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "common.h"
#include <stdio.h>
#include <err.h>
#include "roken.h"
RCSID("$Id: buffer.c,v 1.2 1997/12/14 23:51:45 assar Exp $");
/*
* Allocate a buffer enough to handle st->st_blksize, if
* there is such a field, otherwise BUFSIZ.
*/
void *
alloc_buffer (void *oldbuf, size_t *sz, struct stat *st)
{
size_t new_sz;
new_sz = BUFSIZ;
#ifdef HAVE_ST_BLKSIZE
if (st)
new_sz = max(BUFSIZ, st->st_blksize);
#endif
if(new_sz > *sz) {
if (oldbuf)
free (oldbuf);
oldbuf = malloc (new_sz);
if (oldbuf == NULL) {
warn ("malloc");
*sz = 0;
return NULL;
}
*sz = new_sz;
}
return oldbuf;
}