X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fxalloc.h;h=8d0fcf0faeeda22f0868df13c78c478f159ef285;hb=d3aea660de14898af6f8f03d452f58b28126dabc;hp=03c430699e498bcc14159c0e1316df668e93de5d;hpb=e970fbf9c5bdbe3f099c579dfb465a389aac3dc2;p=gnulib.git

diff --git a/lib/xalloc.h b/lib/xalloc.h
index 03c430699..8d0fcf0fa 100644
--- a/lib/xalloc.h
+++ b/lib/xalloc.h
@@ -1,7 +1,7 @@
 /* xalloc.h -- malloc with out-of-memory checking
 
    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2003 Free Software Foundation, Inc.
+   1999, 2000, 2003, 2004 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
@@ -22,6 +22,12 @@
 
 # include <stddef.h>
 
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+
 # ifndef __attribute__
 #  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
 #   define __attribute__(x)
@@ -32,18 +38,9 @@
 #  define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
 # endif
 
-/* If this pointer is non-zero, run the specified function upon each
-   allocation failure.  It is initialized to zero. */
-extern void (*xalloc_fail_func) (void);
-
-/* If XALLOC_FAIL_FUNC is undefined or a function that returns, this
-   message is output.  It is translated via gettext.
-   Its value is "memory exhausted".  */
-extern char const xalloc_msg_memory_exhausted[];
-
-/* This function is always triggered when memory is exhausted.  It is
-   in charge of honoring the two previous items.  It exits with status
-   exit_failure (defined in exitfail.h).  This is the
+/* 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 void xalloc_die (void) ATTRIBUTE_NORETURN;
@@ -54,17 +51,29 @@ void *xzalloc (size_t s);
 void *xcalloc (size_t n, size_t s);
 void *xrealloc (void *p, size_t s);
 void *xnrealloc (void *p, size_t n, size_t s);
-void *xclone (void const *p, size_t s);
-char *xstrdup (const char *str);
-
-/* These macros are deprecated; they will go away soon, and are retained
-   temporarily only to ease conversion to the functions described above.  */
-# define CCLONE(p, n) xclone (p, (n) * sizeof *(p))
-# define CLONE(p) xclone (p, sizeof *(p))
-# define NEW(type, var) type *var = xmalloc (sizeof (type))
-# define XCALLOC(type, n) xcalloc (n, sizeof (type))
-# define XMALLOC(type, n) xnmalloc (n, sizeof (type))
-# define XREALLOC(p, type, n) xnrealloc (p, n, sizeof (type))
-# define XFREE(p) free (p)
+void *x2realloc (void *p, size_t *pn);
+void *x2nrealloc (void *p, size_t *pn, size_t s);
+void *xmemdup (void const *p, size_t s);
+char *xstrdup (char const *str);
+
+/* 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))
+
+# ifdef __cplusplus
+}
+# endif
+
 
 #endif /* !XALLOC_H_ */