import RT-Thread@9217865c without bsp, libcpu and components/net

examples/libc/dirent.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-11-17     Bernard      first version
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <finsh.h>
+
+#include <dirent.h>
+int libc_dirent()
+{
+    DIR * dirp;
+    long int save3 = 0;
+    long int cur;
+    int i = 0;
+    int result = 0;
+    struct dirent *dp;
+
+    dirp = opendir("/");
+    for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp))
+    {
+        /* save position 3 (after fourth entry) */
+        if (i++ == 3)
+            save3 = telldir(dirp);
+
+        printf("%s\n", dp->d_name);
+
+        /* stop at 400 (just to make sure dirp->__offset and dirp->__size are
+         scrambled */
+        if (i == 400)
+            break;
+    }
+
+    printf("going back past 4-th entry...\n");
+
+    /* go back to saved entry */
+    seekdir(dirp, save3);
+
+    /* Check whether telldir equals to save3 now.  */
+    cur = telldir(dirp);
+    if (cur != save3)
+    {
+        printf("seekdir (d, %ld); telldir (d) == %ld\n", save3, cur);
+        result = 1;
+    }
+
+    /* print remaining files (3-last) */
+    for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp))
+        printf("%s\n", dp->d_name);
+
+    closedir(dirp);
+    return result;
+}
+FINSH_FUNCTION_EXPORT(libc_dirent, dirent test for libc);