123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
|
/* xmalloc.c -- malloc with out of memory checking
|
||
|
|
||
|
Copyright (C) 1990-2000, 2002-2006, 2008-2020 Free Software Foundation, Inc.
|
||
|
|
||
|
This program is free software: you can redistribute it and/or modify
|
||
|
it under the terms of the GNU General Public License as published by
|
||
|
the Free Software Foundation; either version 3 of the License, or
|
||
|
(at your option) any later version.
|
||
|
|
||
|
This program is distributed in the hope that it will be useful,
|
||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
GNU General Public License for more details.
|
||
|
|
||
|
You should have received a copy of the GNU General Public License
|
||
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||
|
|
||
|
#include <config.h>
|
||
|
|
||
|
#define XALLOC_INLINE _GL_EXTERN_INLINE
|
||
|
|
||
|
#include "xalloc.h"
|
||
|
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
/* 1 if calloc is known to be compatible with GNU calloc. This
|
||
|
matters if we are not also using the calloc module, which defines
|
||
|
HAVE_CALLOC_GNU and supports the GNU API even on non-GNU platforms. */
|
||
|
#if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
|
||
|
enum { HAVE_GNU_CALLOC = 1 };
|
||
|
#else
|
||
|
enum { HAVE_GNU_CALLOC = 0 };
|
||
|
#endif
|
||
|
|
||
|
/* Allocate N bytes of memory dynamically, with error checking. */
|
||
|
|
||
|
void *
|
||
|
xmalloc (size_t n)
|
||
|
{
|
||
|
void *p = malloc (n);
|
||
|
if (!p && n != 0)
|
||
|
xalloc_die ();
|
||
|
return p;
|
||
|
}
|
||
|
|
||
|
/* Change the size of an allocated block of memory P to N bytes,
|
||
|
with error checking. */
|
||
|
|
||
|
void *
|
||
|
xrealloc (void *p, size_t n)
|
||
|
{
|
||
|
if (!n && p)
|
||
|
{
|
||
|
/* The GNU and C99 realloc behaviors disagree here. Act like
|
||
|
GNU, even if the underlying realloc is C99. */
|
||
|
free (p);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
p = realloc (p, n);
|
||
|
if (!p && n)
|
||
|
xalloc_die ();
|
||
|
return p;
|
||
|
}
|
||
|
|
||
|
/* If P is null, allocate a block of at least *PN bytes; otherwise,
|
||
|
reallocate P so that it contains more than *PN bytes. *PN must be
|
||
|
nonzero unless P is null. Set *PN to the new block's size, and
|
||
|
return the pointer to the new block. *PN is never set to zero, and
|
||
|
the returned pointer is never null. */
|
||
|
|
||
|
void *
|
||
|
x2realloc (void *p, size_t *pn)
|
||
|
{
|
||
|
return x2nrealloc (p, pn, 1);
|
||
|
}
|
||
|
|
||
|
/* Allocate N bytes of zeroed memory dynamically, with error checking.
|
||
|
There's no need for xnzalloc (N, S), since it would be equivalent
|
||
|
to xcalloc (N, S). */
|
||
|
|
||
|
void *
|
||
|
xzalloc (size_t n)
|
||
|
{
|
||
|
return xcalloc (n, 1);
|
||
|
}
|
||
|
|
||
|
/* Allocate zeroed memory for N elements of S bytes, with error
|
||
|
checking. S must be nonzero. */
|
||
|
|
||
|
void *
|
||
|
xcalloc (size_t n, size_t s)
|
||
|
{
|
||
|
void *p;
|
||
|
/* Test for overflow, since objects with size greater than
|
||
|
PTRDIFF_MAX cause pointer subtraction to go awry. Omit size-zero
|
||
|
tests if HAVE_GNU_CALLOC, since GNU calloc never returns NULL if
|
||
|
successful. */
|
||
|
if (xalloc_oversized (n, s)
|
||
|
|| (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
|
||
|
xalloc_die ();
|
||
|
return p;
|
||
|
}
|
||
|
|
||
|
/* Clone an object P of size S, with error checking. There's no need
|
||
|
for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
|
||
|
need for an arithmetic overflow check. */
|
||
|
|
||
|
void *
|
||
|
xmemdup (void const *p, size_t s)
|
||
|
{
|
||
|
return memcpy (xmalloc (s), p, s);
|
||
|
}
|
||
|
|
||
|
/* Clone STRING. */
|
||
|
|
||
|
char *
|
||
|
xstrdup (char const *string)
|
||
|
{
|
||
|
return xmemdup (string, strlen (string) + 1);
|
||
|
}
|