[gnunet] branch master updated: add GNUNET_freez for #6186

[gnunet]

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grothoff pushed a commit to branch master
in repository gnunet.

The following commit(s) were added to refs/heads/master by this push:
     new 6b89b84d2 add GNUNET_freez for #6186
6b89b84d2 is described below

commit 6b89b84d2781a774adbadf272eb90785889b8407
Author: Christian Grothoff <address@hidden>
AuthorDate: Fri Apr 17 18:21:17 2020 +0200

    add GNUNET_freez for #6186
---
 src/include/gnunet_common.h | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/include/gnunet_common.h b/src/include/gnunet_common.h
index 6a4e21823..78aeb3de7 100644
--- a/src/include/gnunet_common.h
+++ b/src/include/gnunet_common.h
@@ -1291,6 +1291,20 @@ GNUNET_is_zero_ (const void *a,
  */
 #define GNUNET_free(ptr) GNUNET_xfree_ (ptr, __FILE__, __LINE__)
 
+/**
+ * @ingroup memory
+ * Wrapper around free. Frees the memory referred to by ptr and sets ptr to 
NULL.
+ * Note that it is generally better to free memory that was
+ * allocated with #GNUNET_array_grow using #GNUNET_array_grow(mem, size, 0) 
instead of #GNUNET_freez.
+ *
+ * @param ptr location where to free the memory. ptr must have
+ *     been returned by #GNUNET_strdup, #GNUNET_strndup, #GNUNET_malloc or 
#GNUNET_array_grow earlier.
+ */
+#define GNUNET_freez(ptr) do { \
+    GNUNET_xfree_ (ptr, __FILE__, __LINE__); \
+    ptr = NULL; \
+} while (0)
+
 /**
  * @ingroup memory
  * Free the memory pointed to by ptr if ptr is not NULL.
@@ -1302,7 +1316,7 @@ GNUNET_is_zero_ (const void *a,
   do                              \
   {                               \
     void *__x__ = ptr;            \
-    if (__x__ != NULL)            \
+    if (NULL != __x__)            \
     {                             \
       GNUNET_free (__x__);        \
     }                             \

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