core: New API functions gpgrt_malloc, gpgrt_calloc, and gpgrt_realloc.

* src/visibility.c (gpgrt_realloc): New API function.
(gpgrt_malloc): New API function.
(gpgrt_calloc): New API function.
* src/visibility.h: Add corresponding macros.
* src/gpg-error.def.in: Add them.
* src/gpg-error.vers: Add them.
* src/init.c (_gpgrt_calloc): New.
* src/gpg-error.h.in: Add prototypes.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/init.c b/src/init.c
index b01e089..0154091 100644
--- a/src/init.c
+++ b/src/init.c
@@ -194,6 +194,27 @@ _gpgrt_malloc (size_t n)
 }
 
 
+void *
+_gpgrt_calloc (size_t n, size_t m)
+{
+  size_t bytes;
+  void *p;
+
+  bytes = n * m; /* size_t is unsigned so the behavior on overflow is
+                    defined. */
+  if (m && bytes / m != n)
+    {
+      _gpg_err_set_errno (ENOMEM);
+      return NULL;
+    }
+
+  p = _gpgrt_realloc (NULL, bytes);
+  if (p)
+    memset (p, 0, bytes);
+  return p;
+}
+
+
 /* The free to be used for data returned by the public API.  */
 void
 _gpgrt_free (void *a)