From d5ecd8fe69115c8587e16a2110bbb92790050b52 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Tue, 30 Jun 2020 11:11:54 -0400
Subject: add some simple tests

---
 Makefile         | 15 ++++++++++++++-
 test/overflow.c  | 13 +++++++++++++
 test/underflow.c | 13 +++++++++++++
 test/zero.c      | 13 +++++++++++++
 4 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 test/overflow.c
 create mode 100644 test/underflow.c
 create mode 100644 test/zero.c

diff --git a/Makefile b/Makefile
index 0dd5261..e8a413f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,15 +1,20 @@
 .POSIX:
 
+BINDIR=bin
 LIBDIR=lib
 OBJDIR=obj
 SRCDIR=src
 INCDIR=include
+TESTDIR=test
 CFLAGS=-I$(INCDIR) -Wall -Wextra -Wpedantic -g
 
 OBJECTS=$(OBJDIR)/mapalloc.o
+TESTS=$(BINDIR)/overflow $(BINDIR)/underflow $(BINDIR)/zero
 
 all: $(LIBDIR)/libmapalloc.a $(LIBDIR)/libmapalloc.so
 
+tests: $(TESTS)
+
 $(OBJDIR)/mapalloc.o: $(SRCDIR)/mapalloc.c $(INCDIR)/mapalloc.h
 	@mkdir -p $(@D)
 	$(CC) -c -o $@ $(CFLAGS) $(SRCDIR)/$(*F).c
@@ -22,5 +27,13 @@ $(LIBDIR)/libmapalloc.so: $(OBJECTS)
 	@mkdir -p $(@D)
 	$(CC) -o $@ -shared $(OBJECTS)
 
+$(BINDIR)/overflow: $(TESTDIR)/overflow.c $(LIBDIR)/libmapalloc.a
+$(BINDIR)/underflow: $(TESTDIR)/underflow.c $(LIBDIR)/libmapalloc.a
+$(BINDIR)/zero: $(TESTDIR)/zero.c $(LIBDIR)/libmapalloc.a
+
+$(TESTS):
+	@mkdir -p $(@D)
+	$(CC) -o $@ $(CFLAGS) $(TESTDIR)/$(@F).c -L$(LIBDIR) -lmapalloc
+
 clean:
-	$(RM) -rf $(LIBDIR) $(OBJDIR)
+	$(RM) -rf $(LIBDIR) $(OBJDIR) $(BINDIR)
diff --git a/test/overflow.c b/test/overflow.c
new file mode 100644
index 0000000..8bb1681
--- /dev/null
+++ b/test/overflow.c
@@ -0,0 +1,13 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <unistd.h>
+#include "mapalloc.h"
+
+int main(void)
+{
+	char *ptr = map_malloc(1);
+	long pagesize = sysconf(_SC_PAGESIZE);
+	printf("ptr: %p, pagesize %ld\n", ptr, pagesize);
+	ptr[pagesize] = '\0';
+	printf("shouldn't get here\n");
+}
diff --git a/test/underflow.c b/test/underflow.c
new file mode 100644
index 0000000..f23aa6d
--- /dev/null
+++ b/test/underflow.c
@@ -0,0 +1,13 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <unistd.h>
+#include "mapalloc.h"
+
+int main(void)
+{
+	char *ptr = map_malloc(1);
+	long pagesize = sysconf(_SC_PAGESIZE);
+	printf("ptr: %p, pagesize %ld\n", ptr, pagesize);
+	ptr[-1] = '\0';
+	printf("shouldn't get here\n");
+}
diff --git a/test/zero.c b/test/zero.c
new file mode 100644
index 0000000..7be3ad2
--- /dev/null
+++ b/test/zero.c
@@ -0,0 +1,13 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <unistd.h>
+#include "mapalloc.h"
+
+int main(void)
+{
+	char *ptr = map_malloc(0);
+	long pagesize = sysconf(_SC_PAGESIZE);
+	printf("ptr: %p, pagesize %ld\n", ptr, pagesize);
+	ptr[0] = '\0';
+	printf("shouldn't get here\n");
+}
-- 
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