Initial scaffold: Makefile, stub malloc/free/realloc, test harness

Build system produces libft_malloc_$HOSTTYPE.so shared library with
Libft (NOMALLOC=1) as dependency. Stub functions print their name
and return NULL. Test runner compares system malloc vs LD_PRELOAD
output using write(2) to avoid stdio interference.

3 files changed, 45 insertions, 0 deletions

diff --git a/src/free.c b/src/free.c
new file mode 100644
index 0000000..22c3faa
--- /dev/null
+++ b/src/free.c
@@ -0,0 +1,14 @@
+/**
+ * @file   free.c
+ * @brief  Stub implementation of free.
+ */
+
+#include "libft.h"
+#include "malloc.h"
+
+void
+free (void *ptr)
+{
+  (void)ptr;
+  ft_putendl_fd ("FREE", 1);
+}
diff --git a/src/malloc.c b/src/malloc.c
new file mode 100644
index 0000000..8982de0
--- /dev/null
+++ b/src/malloc.c
@@ -0,0 +1,15 @@
+/**
+ * @file   malloc.c
+ * @brief  Stub implementation of malloc.
+ */
+
+#include "malloc.h"
+#include "libft.h"
+
+void *
+malloc (size_t size)
+{
+  (void)size;
+  ft_putendl_fd ("MALLOC", 1);
+  return (NULL);
+}
diff --git a/src/realloc.c b/src/realloc.c
new file mode 100644
index 0000000..c0bbfed
--- /dev/null
+++ b/src/realloc.c
@@ -0,0 +1,16 @@
+/**
+ * @file   realloc.c
+ * @brief  Stub implementation of realloc.
+ */
+
+#include "libft.h"
+#include "malloc.h"
+
+void *
+realloc (void *ptr, size_t size)
+{
+  (void)ptr;
+  (void)size;
+  ft_putendl_fd ("REALLOC", 1);
+  return (NULL);
+}