Merge commit '3feb3d6ce4be0a09a9f8f13d613bed25b523b6e7'

* commit '3feb3d6ce4be0a09a9f8f13d613bed25b523b6e7':
  mem: Introduce av_reallocp

Conflicts:
	doc/APIchanges
	libavutil/mem.c
	libavutil/mem.h
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

doc/APIchanges

@@ -15,6 +15,9 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2013-09-xx - xxxxxxx - lavu 52.13.0 - mem.h
+  Add av_reallocp.
+
 2013-09-04 - 3e1f507 - lavc 55.31.101 - avcodec.h
   avcodec_close() argument can be NULL.
 

libavutil/mem.c

@@ -180,6 +180,22 @@ void *av_realloc_f(void *ptr, size_t nelem, size_t elsize)
     return r;
 }
 
+int av_reallocp(void *ptr, size_t size)
+{
+    void **ptrptr = ptr;
+    void *ret;
+
+    ret = av_realloc(*ptrptr, size);
+
+    if (!ret) {
+        av_freep(ptr);
+        return AVERROR(ENOMEM);
+    }
+
+    *ptrptr = ret;
+    return 0;
+}
+
 void *av_realloc_array(void *ptr, size_t nmemb, size_t size)
 {
     if (!size || nmemb >= INT_MAX / size)

libavutil/mem.h

@@ -127,6 +127,25 @@ void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
  */
 void *av_realloc_f(void *ptr, size_t nelem, size_t elsize);
 
+/**
+ * Allocate or reallocate a block of memory.
+ * If *ptr is NULL and size > 0, allocate a new block. If
+ * size is zero, free the memory block pointed to by ptr.
+ * @param   ptr Pointer to a pointer to a memory block already allocated
+ *          with av_realloc(), or pointer to a pointer to NULL.
+ *          The pointer is updated on success, or freed on failure.
+ * @param   size Size in bytes for the memory block to be allocated or
+ *          reallocated
+ * @return  Zero on success, an AVERROR error code on failure.
+ * @warning Pointers originating from the av_malloc() family of functions must
+ *          not be passed to av_reallocp(). The former can be implemented using
+ *          memalign() (or other functions), and there is no guarantee that
+ *          pointers from such functions can be passed to realloc() at all.
+ *          The situation is undefined according to POSIX and may crash with
+ *          some libc implementations.
+ */
+int av_reallocp(void *ptr, size_t size);
+
 /**
  * Allocate or reallocate an array.
  * If ptr is NULL and nmemb > 0, allocate a new block. If

libavutil/version.h

@@ -75,7 +75,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR  43
+#define LIBAVUTIL_VERSION_MINOR  44
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \