common: Add xreallocarray function.

* common/miscellaneous.c (xreallocarray): New func.
* common/util.h (xtryreallocarray): New macro.
--

Very useful to match calloc behaviour.

Signed-off-by: Werner Koch <wk@gnupg.org>

common/miscellaneous.c

@@ -117,6 +117,17 @@ xoutofcore (void)
 }
 
 
+/* Wrapper around gpgrt_reallocarray.   */
+void *
+xreallocarray (void *a, size_t oldnmemb, size_t nmemb, size_t size)
+{
+  void *p = gpgrt_reallocarray (a, oldnmemb, nmemb, size);
+  if (!p)
+    xoutofcore ();
+  return p;
+}
+
+
 /* A wrapper around gcry_cipher_algo_name to return the string
    "AES-128" instead of "AES".  Given that we have an alias in
    libgcrypt for it, it does not harm to too much to return this other

common/util.h

@@ -99,6 +99,7 @@ typedef char **rl_completion_func_t (const char *, int, int);
 #define xtrycalloc(a,b)  gcry_calloc ((a),(b))
 #define xtrycalloc_secure(a,b)  gcry_calloc_secure ((a),(b))
 #define xtryrealloc(a,b) gcry_realloc ((a),(b))
+#define xtryreallocarray(a,b,c,d) gpgrt_reallocarray ((a),(b),(c),(d))
 #define xtrystrdup(a)    gcry_strdup ((a))
 #define xfree(a)         gcry_free ((a))
 #define xfree_fnc        gcry_free
@@ -109,6 +110,7 @@ typedef char **rl_completion_func_t (const char *, int, int);
 #define xcalloc_secure(a,b) gcry_xcalloc_secure ((a),(b))
 #define xrealloc(a,b)    gcry_xrealloc ((a),(b))
 #define xstrdup(a)       gcry_xstrdup ((a))
+/* See also the xreallocarray prototype below.  */
 
 /* For compatibility with gpg 1.4 we also define these: */
 #define xmalloc_clear(a) gcry_xcalloc (1, (a))
@@ -306,6 +308,12 @@ void setup_libgcrypt_logging (void);
 /* Print an out of core message and die.  */
 void xoutofcore (void);
 
+/* Wrapper aroung gpgrt_reallocarray.  Uses the gpgrt alloc function
+ * which are redirect to the Libgcrypt versions via
+ * init_common_subsystems.  Thus they can be used interchangeable with
+ * the other alloc functions. */
+void *xreallocarray (void *a, size_t oldnmemb, size_t nmemb, size_t size);
+
 /* Same as estream_asprintf but die on memory failure.  */
 char *xasprintf (const char *fmt, ...) GPGRT_ATTR_PRINTF(1,2);
 /* This is now an alias to estream_asprintf.  */