Add --malloc-prefix to apply a prefix to malloc, free etc

This makes it easy to use a replacement allocator instead of the
system default one.

Originally committed as revision 21509 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 17 insertions, 0 deletions

diff --git a/libavutil/mem.c b/libavutil/mem.c
index 741450b53f..4d776d4450 100644
--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -33,6 +33,7 @@
 #include <malloc.h>
 #endif
 
+#include "avutil.h"
 #include "mem.h"
 
 /* here we can use OS-dependent allocation functions */
@@ -40,6 +41,22 @@
 #undef malloc
 #undef realloc
 
+#ifdef MALLOC_PREFIX
+
+#define malloc         AV_JOIN(MALLOC_PREFIX, malloc)
+#define memalign       AV_JOIN(MALLOC_PREFIX, memalign)
+#define posix_memalign AV_JOIN(MALLOC_PREFIX, posix_memalign)
+#define realloc        AV_JOIN(MALLOC_PREFIX, realloc)
+#define free           AV_JOIN(MALLOC_PREFIX, free)
+
+void *malloc(size_t size);
+void *memalign(size_t align, size_t size);
+int   posix_memalign(void **ptr, size_t align, size_t size);
+void *realloc(void *ptr, size_t size);
+void  free(void *ptr);
+
+#endif /* MALLOC_PREFIX */
+
 /* You can redefine av_malloc and av_free in your project to use your
    memory allocator. You do not need to suppress this file because the
    linker will do it automatically. */