mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-28 21:22:07 +00:00
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/* $OpenBSD: recallocarray.c,v 1.1 2017/03/06 18:44:21 otto Exp $ */
|
|
/*
|
|
* Copyright (c) 2008, 2017 Otto Moerbeek <otto@drijf.net>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/* OPENBSD ORIGINAL: lib/libc/stdlib/recallocarray.c */
|
|
|
|
#include "includes.h"
|
|
#ifndef HAVE_RECALLOCARRAY
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#ifdef HAVE_STDINT_H
|
|
#include <stdint.h>
|
|
#endif
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
/*
|
|
* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
|
|
* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
|
|
*/
|
|
#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
|
|
|
|
void *
|
|
recallocarray(void *ptr, size_t oldnmemb, size_t newnmemb, size_t size)
|
|
{
|
|
size_t oldsize, newsize;
|
|
void *newptr;
|
|
|
|
if (ptr == NULL)
|
|
return calloc(newnmemb, size);
|
|
|
|
if ((newnmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
|
|
newnmemb > 0 && SIZE_MAX / newnmemb < size) {
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
newsize = newnmemb * size;
|
|
|
|
if ((oldnmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
|
|
oldnmemb > 0 && SIZE_MAX / oldnmemb < size) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
oldsize = oldnmemb * size;
|
|
|
|
/*
|
|
* Don't bother too much if we're shrinking just a bit,
|
|
* we do not shrink for series of small steps, oh well.
|
|
*/
|
|
if (newsize <= oldsize) {
|
|
size_t d = oldsize - newsize;
|
|
|
|
if (d < oldsize / 2 && d < (size_t)getpagesize()) {
|
|
memset((char *)ptr + newsize, 0, d);
|
|
return ptr;
|
|
}
|
|
}
|
|
|
|
newptr = malloc(newsize);
|
|
if (newptr == NULL)
|
|
return NULL;
|
|
|
|
if (newsize > oldsize) {
|
|
memcpy(newptr, ptr, oldsize);
|
|
memset((char *)newptr + oldsize, 0, newsize - oldsize);
|
|
} else
|
|
memcpy(newptr, ptr, newsize);
|
|
|
|
explicit_bzero(ptr, oldsize);
|
|
free(ptr);
|
|
|
|
return newptr;
|
|
}
|
|
/* DEF_WEAK(recallocarray); */
|
|
|
|
#endif /* HAVE_RECALLOCARRAY */
|