md5, sha1, sha256, sha512: add gl_SET_CRYPTO_CHECK_DEFAULT

[gnulib.git] / lib / xmalloc.c

diff --git a/lib/xmalloc.c b/lib/xmalloc.c
index f989004..57e34b7 100644 (file)
--- a/lib/xmalloc.c
+++ b/lib/xmalloc.c
@@ -1,10 +1,11 @@
 /* xmalloc.c -- malloc with out of memory checking
-   Copyright (C) 1990, 1991 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   Copyright (C) 1990-2000, 2002-2006, 2008-2013 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
-   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
@@ -12,54 +13,110 @@
    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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#define XALLOC_INLINE _GL_EXTERN_INLINE
+
+#include "xalloc.h"
 
-#ifdef STDC_HEADERS
 #include <stdlib.h>
+#include <string.h>
+
+/* 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
-char *malloc ();
-char *realloc ();
-void free ();
+enum { HAVE_GNU_CALLOC = 0 };
 #endif
 
-void error ();
-
 /* Allocate N bytes of memory dynamically, with error checking.  */
 
-char *
-xmalloc (n)
-     unsigned n;
+void *
+xmalloc (size_t n)
 {
-  char *p;
-
-  p = malloc (n);
-  if (p == 0)
-    /* Must exit with 2 for `cmp'.  */
-    error (2, 0, "virtual memory exhausted");
+  void *p = malloc (n);
+  if (!p && n != 0)
+    xalloc_die ();
   return p;
 }
 
 /* Change the size of an allocated block of memory P to N bytes,
-   with error checking.
-   If P is NULL, run xmalloc.
-   If N is 0, run free and return NULL.  */
+   with error checking.  */
 
-char *
-xrealloc (p, n)
-     char *p;
-     unsigned n;
+void *
+xrealloc (void *p, size_t n)
 {
-  if (p == 0)
-    return xmalloc (n);
-  if (n == 0)
+  if (!n && p)
     {
+      /* The GNU and C99 realloc behaviors disagree here.  Act like
+         GNU, even if the underlying realloc is C99.  */
       free (p);
-      return 0;
+      return NULL;
     }
+
   p = realloc (p, n);
-  if (p == 0)
-    /* Must exit with 2 for `cmp'.  */
-    error (2, 0, "virtual memory exhausted");
+  if (!p && n)
+    xalloc_die ();
+  return p;
+}
+
+/* If P is null, allocate a block of at least *PN bytes; otherwise,
+   reallocate P so that it contains more than *PN bytes.  *PN must be
+   nonzero unless P is null.  Set *PN to the new block's size, and
+   return the pointer to the new block.  *PN is never set to zero, and
+   the returned pointer is never null.  */
+
+void *
+x2realloc (void *p, size_t *pn)
+{
+  return x2nrealloc (p, pn, 1);
+}
+
+/* Allocate S bytes of zeroed memory dynamically, with error checking.
+   There's no need for xnzalloc (N, S), since it would be equivalent
+   to xcalloc (N, S).  */
+
+void *
+xzalloc (size_t s)
+{
+  return memset (xmalloc (s), 0, s);
+}
+
+/* Allocate zeroed memory for N elements of S bytes, with error
+   checking.  S must be nonzero.  */
+
+void *
+xcalloc (size_t n, size_t s)
+{
+  void *p;
+  /* Test for overflow, since some calloc implementations don't have
+     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 xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
+   need for an arithmetic overflow check.  */
+
+void *
+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);
+}