From f2a8df6171b3eae8c949c892e8a35d7acd51084c Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Tue, 30 Jun 2020 15:31:31 -0400
Subject: add a test program that can be wrapped with LD_PRELOAD

---
 Makefile       |  6 +++++-
 test/wrapper.c | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 test/wrapper.c

diff --git a/Makefile b/Makefile
index 867b86c..b31f413 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ all: $(LIBDIR)/libmapalloc.a $(LIBDIR)/libwrapalloc.so
 
 #$(LIBDIR)/libmapalloc.so
 
-tests: $(TESTS)
+tests: $(TESTS) $(BINDIR)/wrapper
 
 $(OBJDIR)/mapalloc.o: $(SRCDIR)/mapalloc.c $(INCDIR)/mapalloc.h
 	@mkdir -p $(@D)
@@ -51,6 +51,10 @@ $(BINDIR)/realloc: $(TESTDIR)/realloc.c
 $(BINDIR)/use-after-free: $(TESTDIR)/use-after-free.c
 $(BINDIR)/double-free: $(TESTDIR)/double-free.c
 
+$(BINDIR)/wrapper: $(TESTDIR)/wrapper.c
+	@mkdir -p $(@D)
+	$(CC) -o $@ $(CFLAGS) $(TESTDIR)/$(@F).c
+
 $(TESTS):
 	@mkdir -p $(@D)
 	$(CC) -o $@ $(CFLAGS) $(TESTDIR)/$(@F).c -L$(LIBDIR) -lmapalloc
diff --git a/test/wrapper.c b/test/wrapper.c
new file mode 100644
index 0000000..a260894
--- /dev/null
+++ b/test/wrapper.c
@@ -0,0 +1,22 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(void)
+{
+	const char buf[] = "THIS IS A CONSTANT STRING";
+
+	char *ptr = realloc(NULL, sizeof(buf));
+	memcpy(ptr, buf, sizeof(buf));
+	printf("%p: %s\n", ptr, ptr);
+
+	ptr = realloc(ptr, sizeof(buf) * 2);
+	memcpy(ptr + sizeof(buf) - 1, buf, sizeof(buf));
+	printf("%p: %s\n", ptr, ptr);
+
+	ptr = realloc(ptr, sizeof(buf) * sysconf(_SC_PAGESIZE));
+	memcpy(ptr + (2 * sizeof(buf)) - 2, buf, sizeof(buf));
+	printf("%p: %s\n", ptr, ptr);
+}
-- 
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