4f52dfbb8d
This completely removes client-side support for the SSH 1 protocol, which was already disabled in 12 but is still enabled in 11. For that reason, we will not be able to merge 7.6p1 or newer back to 11.
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 $ */
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/*
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* Copyright (c) 2008, 2017 Otto Moerbeek <otto@drijf.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* OPENBSD ORIGINAL: lib/libc/stdlib/recallocarray.c */
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#include "includes.h"
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#ifndef HAVE_RECALLOCARRAY
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#include <errno.h>
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#include <stdlib.h>
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#include <string.h>
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#include <unistd.h>
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/*
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* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
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* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
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*/
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#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
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void *
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recallocarray(void *ptr, size_t oldnmemb, size_t newnmemb, size_t size)
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{
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size_t oldsize, newsize;
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void *newptr;
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if (ptr == NULL)
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return calloc(newnmemb, size);
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if ((newnmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
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newnmemb > 0 && SIZE_MAX / newnmemb < size) {
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errno = ENOMEM;
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return NULL;
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}
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newsize = newnmemb * size;
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if ((oldnmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
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oldnmemb > 0 && SIZE_MAX / oldnmemb < size) {
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errno = EINVAL;
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return NULL;
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}
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oldsize = oldnmemb * size;
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/*
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* Don't bother too much if we're shrinking just a bit,
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* we do not shrink for series of small steps, oh well.
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*/
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if (newsize <= oldsize) {
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size_t d = oldsize - newsize;
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if (d < oldsize / 2 && d < (size_t)getpagesize()) {
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memset((char *)ptr + newsize, 0, d);
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return ptr;
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}
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}
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newptr = malloc(newsize);
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if (newptr == NULL)
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return NULL;
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if (newsize > oldsize) {
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memcpy(newptr, ptr, oldsize);
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memset((char *)newptr + oldsize, 0, newsize - oldsize);
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} else
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memcpy(newptr, ptr, newsize);
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explicit_bzero(ptr, oldsize);
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free(ptr);
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return newptr;
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}
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/* DEF_WEAK(recallocarray); */
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#endif /* HAVE_RECALLOCARRAY */
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