/* xmalloc.c -- malloc with out of memory checking
- Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1990-2000, 2002-2006, 2008-2014 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+#define XALLOC_INLINE _GL_EXTERN_INLINE
#include "xalloc.h"
#include <stdlib.h>
#include <string.h>
-#ifndef SIZE_MAX
-# define SIZE_MAX ((size_t) -1)
-#endif
-
/* 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 and supports the GNU API even on non-GNU platforms. */
-#if defined HAVE_CALLOC || defined __GLIBC__
+ 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 an array of N objects, each with S bytes of memory,
- dynamically, with error checking. S must be nonzero. */
-
-static inline void *
-xnmalloc_inline (size_t n, size_t s)
-{
- void *p;
- if (xalloc_oversized (n, s) || (! (p = malloc (n * s)) && n != 0))
- xalloc_die ();
- return p;
-}
-
-void *
-xnmalloc (size_t n, size_t s)
-{
- return xnmalloc_inline (n, s);
-}
-
/* Allocate N bytes of memory dynamically, with error checking. */
void *
xmalloc (size_t n)
{
- return xnmalloc_inline (n, 1);
-}
-
-/* Change the size of an allocated block of memory P to an array of N
- objects each of S bytes, with error checking. S must be nonzero. */
-
-static inline void *
-xnrealloc_inline (void *p, size_t n, size_t s)
-{
- if (xalloc_oversized (n, s) || (! (p = realloc (p, n * s)) && n != 0))
+ void *p = malloc (n);
+ if (!p && n != 0)
xalloc_die ();
return p;
}
-void *
-xnrealloc (void *p, size_t n, size_t s)
-{
- return xnrealloc_inline (p, n, s);
-}
-
/* Change the size of an allocated block of memory P to N bytes,
with error checking. */
void *
xrealloc (void *p, size_t n)
{
- return xnrealloc_inline (p, n, 1);
-}
-
-
-/* If P is null, allocate a block of at least *PN such objects;
- otherwise, reallocate P so that it contains more than *PN objects
- each of S bytes. *PN must be nonzero unless P is null, and S must
- be nonzero. Set *PN to the new number of objects, and return the
- pointer to the new block. *PN is never set to zero, and the
- returned pointer is never null.
-
- Repeated reallocations are guaranteed to make progress, either by
- allocating an initial block with a nonzero size, or by allocating a
- larger block.
-
- In the following implementation, nonzero sizes are doubled so that
- repeated reallocations have O(N log N) overall cost rather than
- O(N**2) cost, but the specification for this function does not
- guarantee that sizes are doubled.
-
- Here is an example of use:
-
- int *p = NULL;
- size_t used = 0;
- size_t allocated = 0;
-
- void
- append_int (int value)
- {
- if (used == allocated)
- p = x2nrealloc (p, &allocated, sizeof *p);
- p[used++] = value;
- }
-
- This causes x2nrealloc to allocate a block of some nonzero size the
- first time it is called.
-
- To have finer-grained control over the initial size, set *PN to a
- nonzero value before calling this function with P == NULL. For
- example:
-
- int *p = NULL;
- size_t used = 0;
- size_t allocated = 0;
- size_t allocated1 = 1000;
-
- void
- append_int (int value)
- {
- if (used == allocated)
- {
- p = x2nrealloc (p, &allocated1, sizeof *p);
- allocated = allocated1;
- }
- p[used++] = value;
- }
-
- */
-
-static inline void *
-x2nrealloc_inline (void *p, size_t *pn, size_t s)
-{
- size_t n = *pn;
-
- if (! p)
- {
- if (! n)
- {
- /* The approximate size to use for initial small allocation
- requests, when the invoking code specifies an old size of
- zero. 64 bytes is the largest "small" request for the
- GNU C library malloc. */
- enum { DEFAULT_MXFAST = 64 };
-
- n = DEFAULT_MXFAST / s;
- n += !n;
- }
- }
- else
+ if (!n && p)
{
- if (SIZE_MAX / 2 / s < n)
- xalloc_die ();
- n *= 2;
+ /* The GNU and C99 realloc behaviors disagree here. Act like
+ GNU, even if the underlying realloc is C99. */
+ free (p);
+ return NULL;
}
- *pn = n;
- return xrealloc (p, n * s);
-}
-
-void *
-x2nrealloc (void *p, size_t *pn, size_t s)
-{
- return x2nrealloc_inline (p, pn, s);
+ p = realloc (p, n);
+ if (!p && n)
+ xalloc_die ();
+ return p;
}
/* If P is null, allocate a block of at least *PN bytes; otherwise,
void *
x2realloc (void *p, size_t *pn)
{
- return x2nrealloc_inline (p, pn, 1);
+ return x2nrealloc (p, pn, 1);
}
/* Allocate S bytes of zeroed memory dynamically, with error checking.
projects / gnulib.git / blobdiff