settings: allow swapping out memory allocator

Tie in the newly created infrastructure for swapping out memory
allocators into our settings code. A user can now simply use the new
option "GIT_OPT_SET_ALLOCATOR" with `git_libgit2_opts`, passing in an
already initialized allocator structure as vararg.

2 files changed, 14 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 79ed1dd5f..35fdd00c4 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -29,3 +29,12 @@ int git_allocator_setup(git_allocator *allocator)
 	memcpy(&git__allocator, allocator, sizeof(*allocator));
 	return 0;
 }
+
+#if !defined(GIT_MSVC_CRTDBG)
+int git_win32_crtdbg_init_allocator(git_allocator *allocator)
+{
+	GIT_UNUSED(allocator);
+	giterr_set(GIT_EINVALID, "crtdbg memory allocator not available");
+	return -1;
+}
+#endif
diff --git a/src/settings.c b/src/settings.c
index f6bc5b270..14280f8c0 100644
--- a/src/settings.c
+++ b/src/settings.c
@@ -16,6 +16,7 @@
 #endif
 
 #include <git2.h>
+#include "alloc.h"
 #include "sysdir.h"
 #include "cache.h"
 #include "global.h"
@@ -260,6 +261,10 @@ int git_libgit2_opts(int key, ...)
 		git_odb__strict_hash_verification = (va_arg(ap, int) != 0);
 		break;
 
+	case GIT_OPT_SET_ALLOCATOR:
+		error = git_allocator_setup(va_arg(ap, git_allocator *));
+		break;
+
 	default:
 		giterr_set(GITERR_INVALID, "invalid option key");
 		error = -1;