core: New function gpgrt_reallocarray.

* src/init.c (_gpgrt_reallocarray): New.
* src/visibility.c (gpgrt_reallocarray): New.
* src/gpg-error.vers, src/gpg-error.def.in: Add new function.
* src/gpg-error.h.in: Add new interface.
* tests/t-malloc.c: New.
* tests/Makefile.am (TESTS): Add new test.
--

Note that this function is different from the glibc function because
it has an extra parameter which allows to clear the new elements.  A
realloc after a calloc with forgotten memset after it is a common
source of error, thus we introduce this slightly different function.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gpgrt-int.h b/src/gpgrt-int.h
index beb55ac..cc22004 100644
--- a/src/gpgrt-int.h
+++ b/src/gpgrt-int.h
@@ -114,6 +114,7 @@ void _gpgrt_abort (void) GPGRT_ATTR_NORETURN;
 void _gpgrt_set_alloc_func (void *(*f)(void *a, size_t n));
 
 void *_gpgrt_realloc (void *a, size_t n);
+void *_gpgrt_reallocarray (void *a, size_t oldnmemb, size_t nmemb, size_t size);
 void *_gpgrt_malloc (size_t n);
 void *_gpgrt_calloc (size_t n, size_t m);
 char *_gpgrt_strdup (const char *string);
@@ -126,6 +127,7 @@ char *_gpgrt_strconcat_core (const char *s1, va_list arg_ptr);
 #define xtrymalloc(a)    _gpgrt_malloc ((a))
 #define xtrycalloc(a,b)  _gpgrt_calloc ((a),(b))
 #define xtryrealloc(a,b) _gpgrt_realloc ((a),(b))
+#define xtryreallocarray(a,b,c,d) _gpgrt_reallocarray ((a),(b),(c),(d))
 #define xtrystrdup(a)    _gpgrt_strdup ((a))
 
 void _gpgrt_pre_syscall (void);