+
−/* xmalloc.c -- malloc with out of memory checking
+
−
+
−   Copyright (C) 1990-2000, 2002-2006, 2008-2013 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 <http://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 S 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 s)
+
−{
+
−  return memset (xmalloc (s), 0, s);
+
−}
+
−
+
−/* 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 some calloc implementations don't have
+
−     proper overflow checks.  But omit overflow and size-zero tests if
+
−     HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
+
−     returns NULL if successful.  */
+
−  if ((! HAVE_GNU_CALLOC && 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);
+
−}