1 /* 2 * Copyright (c) 1995-2000 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "common.h" 35 #include <stdio.h> 36 #include <err.h> 37 #include "roken.h" 38 39 RCSID("$Id: buffer.c,v 1.4 2000/10/23 04:49:25 joda Exp $"); 40 41 /* 42 * Allocate a buffer enough to handle st->st_blksize, if 43 * there is such a field, otherwise BUFSIZ. 44 */ 45 46 void * 47 alloc_buffer (void *oldbuf, size_t *sz, struct stat *st) 48 { 49 size_t new_sz; 50 51 new_sz = BUFSIZ; 52 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE 53 if (st) 54 new_sz = max(BUFSIZ, st->st_blksize); 55 #endif 56 if(new_sz > *sz) { 57 if (oldbuf) 58 free (oldbuf); 59 oldbuf = malloc (new_sz); 60 if (oldbuf == NULL) { 61 warn ("malloc"); 62 *sz = 0; 63 return NULL; 64 } 65 *sz = new_sz; 66 } 67 return oldbuf; 68 } 69 70