X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fxmalloc.c;h=687633c250cfeee9eaa1e9227feec92d1281612f;hb=5fa5d3d767b29cf1d757609afbb56459b09743fa;hp=9b7a948c2f18bc342294088ecbe2d2ab94f84ca6;hpb=b0cc20c2269022fd9907014686ac682dff0e5978;p=gnulib.git

diff --git a/lib/xmalloc.c b/lib/xmalloc.c
index 9b7a948c2..687633c25 100644
--- a/lib/xmalloc.c
+++ b/lib/xmalloc.c
@@ -1,7 +1,7 @@
 /* xmalloc.c -- malloc with out of memory checking
 
    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
+   1999, 2000, 2002, 2003, 2004, 2005 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
@@ -15,9 +15,9 @@
 
    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.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-#if HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
@@ -30,6 +30,15 @@
 # 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__
+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.  */
 
@@ -204,18 +213,29 @@ 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)) && n != 0))
+     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);
+}