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-rw-r--r--tests/xalloc.h151
1 files changed, 84 insertions, 67 deletions
diff --git a/tests/xalloc.h b/tests/xalloc.h
index 81ef680a..6122cc58 100644
--- a/tests/xalloc.h
+++ b/tests/xalloc.h
@@ -1,6 +1,8 @@
/* xalloc.h -- malloc with out-of-memory checking
- Copyright (C) 1990-2000, 2003-2004, 2006-2015 Free Software Foundation, Inc.
+ Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2003, 2004, 2006, 2007, 2008, 2009, 2010 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
@@ -16,58 +18,64 @@
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef XALLOC_H_
-#define XALLOC_H_
+# define XALLOC_H_
-#include <stddef.h>
+# include <stddef.h>
-#include "xalloc-oversized.h"
-#ifndef _GL_INLINE_HEADER_BEGIN
- #error "Please include config.h first."
-#endif
-_GL_INLINE_HEADER_BEGIN
-#ifndef XALLOC_INLINE
-# define XALLOC_INLINE _GL_INLINE
-#endif
-
-#ifdef __cplusplus
+# ifdef __cplusplus
extern "C" {
-#endif
+# endif
+
+# ifndef __attribute__
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
+# define __attribute__(x)
+# endif
+# endif
-#if __GNUC__ >= 3
-# define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
-#else
-# define _GL_ATTRIBUTE_MALLOC
-#endif
+# ifndef ATTRIBUTE_NORETURN
+# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
+# endif
-#if ! defined __clang__ && \
- (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
-# define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
-#else
-# define _GL_ATTRIBUTE_ALLOC_SIZE(args)
-#endif
+# ifndef ATTRIBUTE_MALLOC
+# if __GNUC__ >= 3
+# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
+# else
+# define ATTRIBUTE_MALLOC
+# endif
+# endif
/* This function is always triggered when memory is exhausted.
It must be defined by the application, either explicitly
or by using gnulib's xalloc-die module. This is the
function to call when one wants the program to die because of a
memory allocation failure. */
-extern _Noreturn void xalloc_die (void);
-
-void *xmalloc (size_t s)
- _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1));
-void *xzalloc (size_t s)
- _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1));
-void *xcalloc (size_t n, size_t s)
- _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2));
-void *xrealloc (void *p, size_t s)
- _GL_ATTRIBUTE_ALLOC_SIZE ((2));
+extern void xalloc_die (void) ATTRIBUTE_NORETURN;
+
+void *xmalloc (size_t s) ATTRIBUTE_MALLOC;
+void *xzalloc (size_t s) ATTRIBUTE_MALLOC;
+void *xcalloc (size_t n, size_t s) ATTRIBUTE_MALLOC;
+void *xrealloc (void *p, size_t s);
void *x2realloc (void *p, size_t *pn);
-void *xmemdup (void const *p, size_t s)
- _GL_ATTRIBUTE_ALLOC_SIZE ((2));
-char *xstrdup (char const *str)
- _GL_ATTRIBUTE_MALLOC;
+void *xmemdup (void const *p, size_t s) ATTRIBUTE_MALLOC;
+char *xstrdup (char const *str) ATTRIBUTE_MALLOC;
+
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+ to size arithmetic overflow. S must be positive and N must be
+ nonnegative. This is a macro, not an inline function, so that it
+ works correctly even when SIZE_MAX < N.
+
+ By gnulib convention, SIZE_MAX represents overflow in size
+ calculations, so the conservative dividend to use here is
+ SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+ However, malloc (SIZE_MAX) fails on all known hosts where
+ sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+ exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+ branch when S is known to be 1. */
+# define xalloc_oversized(n, s) \
+ ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
/* In the following macros, T must be an elementary or structure/union or
typedef'ed type, or a pointer to such a type. To apply one of the
@@ -76,31 +84,41 @@ char *xstrdup (char const *str)
/* Allocate an object of type T dynamically, with error checking. */
/* extern t *XMALLOC (typename t); */
-#define XMALLOC(t) ((t *) xmalloc (sizeof (t)))
+# define XMALLOC(t) ((t *) xmalloc (sizeof (t)))
/* Allocate memory for N elements of type T, with error checking. */
/* extern t *XNMALLOC (size_t n, typename t); */
-#define XNMALLOC(n, t) \
- ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t))))
+# define XNMALLOC(n, t) \
+ ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t))))
/* Allocate an object of type T dynamically, with error checking,
and zero it. */
/* extern t *XZALLOC (typename t); */
-#define XZALLOC(t) ((t *) xzalloc (sizeof (t)))
+# define XZALLOC(t) ((t *) xzalloc (sizeof (t)))
/* Allocate memory for N elements of type T, with error checking,
and zero it. */
/* extern t *XCALLOC (size_t n, typename t); */
-#define XCALLOC(n, t) \
- ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t))))
+# define XCALLOC(n, t) \
+ ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t))))
+
+# if HAVE_INLINE
+# define static_inline static inline
+# else
+void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC;
+void *xnrealloc (void *p, size_t n, size_t s);
+void *x2nrealloc (void *p, size_t *pn, size_t s);
+char *xcharalloc (size_t n) ATTRIBUTE_MALLOC;
+# endif
+
+# ifdef static_inline
/* Allocate an array of N objects, each with S bytes of memory,
dynamically, with error checking. S must be nonzero. */
-XALLOC_INLINE void *xnmalloc (size_t n, size_t s)
- _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2));
-XALLOC_INLINE void *
+static_inline void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC;
+static_inline void *
xnmalloc (size_t n, size_t s)
{
if (xalloc_oversized (n, s))
@@ -111,9 +129,7 @@ xnmalloc (size_t n, size_t s)
/* 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. */
-XALLOC_INLINE void *xnrealloc (void *p, size_t n, size_t s)
- _GL_ATTRIBUTE_ALLOC_SIZE ((2, 3));
-XALLOC_INLINE void *
+static_inline void *
xnrealloc (void *p, size_t n, size_t s)
{
if (xalloc_oversized (n, s))
@@ -123,9 +139,10 @@ xnrealloc (void *p, size_t n, size_t s)
/* 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. 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.
+ 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
@@ -175,7 +192,7 @@ xnrealloc (void *p, size_t n, size_t s)
*/
-XALLOC_INLINE void *
+static_inline void *
x2nrealloc (void *p, size_t *pn, size_t s)
{
size_t n = *pn;
@@ -186,9 +203,9 @@ x2nrealloc (void *p, size_t *pn, size_t s)
{
/* The approximate size to use for initial small allocation
requests, when the invoking code specifies an old size of
- zero. This is the largest "small" request for the GNU C
- library malloc. */
- enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 };
+ zero. 64 bytes is the largest "small" request for the
+ GNU C library malloc. */
+ enum { DEFAULT_MXFAST = 64 };
n = DEFAULT_MXFAST / s;
n += !n;
@@ -196,13 +213,13 @@ x2nrealloc (void *p, size_t *pn, size_t s)
}
else
{
- /* Set N = floor (1.5 * N) + 1 so that progress is made even if N == 0.
+ /* Set N = ceil (1.5 * N) so that progress is made if N == 1.
Check for overflow, so that N * S stays in size_t range.
- The check may be slightly conservative, but an exact check isn't
+ The check is slightly conservative, but an exact check isn't
worth the trouble. */
if ((size_t) -1 / 3 * 2 / s <= n)
xalloc_die ();
- n += n / 2 + 1;
+ n += (n + 1) / 2;
}
*pn = n;
@@ -212,15 +229,16 @@ x2nrealloc (void *p, size_t *pn, size_t s)
/* Return a pointer to a new buffer of N bytes. This is like xmalloc,
except it returns char *. */
-XALLOC_INLINE char *xcharalloc (size_t n)
- _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1));
-XALLOC_INLINE char *
+static_inline char *xcharalloc (size_t n) ATTRIBUTE_MALLOC;
+static_inline char *
xcharalloc (size_t n)
{
return XNMALLOC (n, char);
}
-#ifdef __cplusplus
+# endif
+
+# ifdef __cplusplus
}
/* C++ does not allow conversions from void * to other pointer types
@@ -257,8 +275,7 @@ xmemdup (T const *p, size_t s)
return (T *) xmemdup ((void const *) p, s);
}
-#endif
+# endif
-_GL_INLINE_HEADER_END
#endif /* !XALLOC_H_ */