add libc testcase.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1061 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/libc/memory.c

@@ -0,0 +1,54 @@
+/*
+ * memory.c
+ *
+ *  Created on: 2010-11-17
+ *      Author: bernard
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <finsh.h>
+#include <errno.h>
+
+static int errors = 0;
+static void merror(const char *msg)
+{
+	++errors;
+	printf("Error: %s\n", msg);
+}
+
+int libc_mem(void)
+{
+	void *p;
+	int save;
+
+	errno = 0;
+
+	p = malloc(-1);
+	save = errno;
+
+	if (p != NULL)
+		merror("malloc (-1) succeeded.");
+
+	if (p == NULL && save != ENOMEM)
+		merror("errno is not set correctly");
+
+	p = malloc(10);
+	if (p == NULL)
+		merror("malloc (10) failed.");
+
+	/* realloc (p, 0) == free (p).  */
+	p = realloc(p, 0);
+	if (p != NULL)
+		merror("realloc (p, 0) failed.");
+
+	p = malloc(0);
+	if (p == NULL)
+		merror("malloc (0) failed.");
+
+	p = realloc(p, 0);
+	if (p != NULL)
+		merror("realloc (p, 0) failed.");
+
+	return errors != 0;
+}
+FINSH_FUNCTION_EXPORT(libc_mem, memory test for libc);