X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fxmalloc.c;h=08c30fb8a3b7cdcfa0fa903df1bd55417bae5395;hb=62f3b86f62d54b61c03a12b9b1674cfb996d9976;hp=181006b43dbc69e40a1d6d5f167093074fe751b9;hpb=9e03434d6fa01da0f148115459893c2fb8d21ae7;p=gnulib.git
diff --git a/lib/xmalloc.c b/lib/xmalloc.c
index 181006b43..08c30fb8a 100644
--- a/lib/xmalloc.c
+++ b/lib/xmalloc.c
@@ -1,12 +1,11 @@
/* xmalloc.c -- malloc with out of memory checking
- Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2003,
- 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1990-2000, 2002-2006, 2008-2011 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
@@ -14,198 +13,57 @@
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see . */
-#if HAVE_CONFIG_H
-# include
-#endif
+#include
+#if ! HAVE_INLINE
+# define static_inline
+#endif
#include "xalloc.h"
+#undef static_inline
#include
#include
-#include "gettext.h"
-#define _(msgid) gettext (msgid)
-#define N_(msgid) msgid
-
-#include "error.h"
-#include "exitfail.h"
-
-#ifndef SIZE_MAX
-# define SIZE_MAX ((size_t) -1)
+/* 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
-#ifndef HAVE_MALLOC
-"you must run the autoconf test for a GNU libc compatible malloc"
-#endif
-
-#ifndef HAVE_REALLOC
-"you must run the autoconf test for a GNU libc compatible realloc"
-#endif
-
-/* If non NULL, call this function when memory is exhausted. */
-void (*xalloc_fail_func) (void) = 0;
-
-/* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
- before exiting when memory is exhausted. Goes through gettext. */
-char const xalloc_msg_memory_exhausted[] = N_("memory exhausted");
-
-void
-xalloc_die (void)
-{
- if (xalloc_fail_func)
- (*xalloc_fail_func) ();
- error (exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
- /* The `noreturn' cannot be given to error, since it may return if
- its first argument is 0. To help compilers understand the
- xalloc_die does terminate, call abort. */
- abort ();
-}
-
-/* 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)))
- 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)))
+ 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 && 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;
- }
+ /* The GNU and C99 realloc behaviors disagree here. Act like
+ GNU, even if the underlying realloc is C99. */
+ free (p);
+ return NULL;
}
- else
- {
- if (SIZE_MAX / 2 / s < n)
- xalloc_die ();
- n *= 2;
- }
-
- *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,
@@ -217,7 +75,7 @@ x2nrealloc (void *p, size_t *pn, size_t s)
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.
@@ -238,18 +96,29 @@ xcalloc (size_t n, size_t s)
{
void *p;
/* Test for overflow, since some calloc implementations don't have
- proper overflow checks. */
- if (xalloc_oversized (n, s) || ! (p = calloc (n, s)))
+ 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 xnclone (P, N, S), since xclone (P, N * S) works without any
+ for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
need for an arithmetic overflow check. */
void *
-xclone (void const *p, size_t s)
+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);
+}