/src/hpn-ssh/openbsd-compat/recallocarray.c

Source (jump to first uncovered line)
/*  $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 */

Line	Count	Source (jump to first uncovered line)
1		/* $OpenBSD: recallocarray.c,v 1.1 2017/03/06 18:44:21 otto Exp $ */
2		/*
3		* Copyright (c) 2008, 2017 Otto Moerbeek <otto@drijf.net>
4		*
5		* Permission to use, copy, modify, and distribute this software for any
6		* purpose with or without fee is hereby granted, provided that the above
7		* copyright notice and this permission notice appear in all copies.
8		*
9		* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10		* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11		* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12		* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13		* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14		* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15		* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16		*/
17
18		/* OPENBSD ORIGINAL: lib/libc/stdlib/recallocarray.c */
19
20		#include "includes.h"
21		#ifndef HAVE_RECALLOCARRAY
22
23		#include <errno.h>
24		#include <stdlib.h>
25		#ifdef HAVE_STDINT_H
26		#include <stdint.h>
27		#endif
28		#include <string.h>
29		#include <unistd.h>
30
31		/*
32		* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
33		* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
34		*/
35	2.97M	#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
36
37		void *
38		recallocarray(void *ptr, size_t oldnmemb, size_t newnmemb, size_t size)
39	495k	{
40	495k	size_t oldsize, newsize;
41	495k	void *newptr;
42
43	495k	if (ptr == NULL)
44	2	return calloc(newnmemb, size);
45
46	495k	if ((newnmemb >= MUL_NO_OVERFLOW \|\| size >= MUL_NO_OVERFLOW) &&
47	495k	newnmemb > 0 && SIZE_MAX / newnmemb < size) {
48	0	errno = ENOMEM;
49	0	return NULL;
50	0	}
51	495k	newsize = newnmemb * size;
52
53	495k	if ((oldnmemb >= MUL_NO_OVERFLOW \|\| size >= MUL_NO_OVERFLOW) &&
54	495k	oldnmemb > 0 && SIZE_MAX / oldnmemb < size) {
55	0	errno = EINVAL;
56	0	return NULL;
57	0	}
58	495k	oldsize = oldnmemb * size;
59
60		/*
61		* Don't bother too much if we're shrinking just a bit,
62		* we do not shrink for series of small steps, oh well.
63		*/
64	495k	if (newsize <= oldsize) {
65	78.3k	size_t d = oldsize - newsize;
66
67	78.3k	if (d < oldsize / 2 && d < (size_t)getpagesize()) {
68	0	memset((char *)ptr + newsize, 0, d);
69	0	return ptr;
70	0	}
71	78.3k	}
72
73	495k	newptr = malloc(newsize);
74	495k	if (newptr == NULL)
75	0	return NULL;
76
77	495k	if (newsize > oldsize) {
78	417k	memcpy(newptr, ptr, oldsize);
79	417k	memset((char *)newptr + oldsize, 0, newsize - oldsize);
80	417k	} else
81	78.3k	memcpy(newptr, ptr, newsize);
82
83	495k	explicit_bzero(ptr, oldsize);
84	495k	free(ptr);
85
86	495k	return newptr;
87	495k	}
88		/* DEF_WEAK(recallocarray); */
89
90		#endif /* HAVE_RECALLOCARRAY */

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Created: 2024-06-18 06:23