add testing user app:sfs_filetest1.c in lab8

labcodes/lab8/user/sfs_filetest1.c

@@ -0,0 +1,43 @@
+#include <ulib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stat.h>
+#include <file.h>
+#include <dir.h>
+#include <unistd.h>
+
+#define printf(...)                 fprintf(1, __VA_ARGS__)
+
+static int safe_open(const char *path, int open_flags)
+{
+	int fd = open(path, open_flags);
+	printf("fd is %d\n",fd);
+	assert(fd >= 0);
+	return fd;
+}
+
+static struct stat *safe_fstat(int fd)
+{
+	static struct stat __stat, *stat = &__stat;
+	int ret = fstat(fd, stat);
+	assert(ret == 0);
+	return stat;
+}
+
+
+static void safe_read(int fd, void *data, size_t len)
+{
+	int ret = read(fd, data, len);
+	assert(ret == len);
+}
+
+
+int main(void)
+{
+	int fd1 = safe_open("sfs_filetest1", O_RDONLY);
+	struct stat *stat = safe_fstat(fd1);
+	assert(stat->st_size >= 0 && stat->st_blocks >= 0);
+	printf("sfs_filetest1 pass.\n");
+	return 0;
+}