extmod/vfs_fat: Move listdir() method from stmhal for reuse.

1 files changed, 97 insertions, 0 deletions

diff --git a/extmod/vfs_fat_misc.c b/extmod/vfs_fat_misc.c
new file mode 100644
index 000000000..f9f49b0d3
--- /dev/null
+++ b/extmod/vfs_fat_misc.c
@@ -0,0 +1,97 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mpconfig.h"
+#if MICROPY_VFS_FAT || MICROPY_FSUSERMOUNT
+
+#include <string.h>
+#include "py/nlr.h"
+#include "py/runtime.h"
+#include "lib/fatfs/ff.h"
+#include "lib/fatfs/diskio.h"
+#include "extmod/vfs_fat_file.h"
+#include "fsusermount.h"
+
+#if _USE_LFN
+STATIC char lfn[_MAX_LFN + 1];   /* Buffer to store the LFN */
+#endif
+
+// TODO: actually, the core function should be ilistdir()
+mp_obj_t fat_vfs_listdir(const char *path, bool is_str_type) {
+    FRESULT res;
+    FILINFO fno;
+    DIR dir;
+#if _USE_LFN
+    fno.lfname = lfn;
+    fno.lfsize = sizeof lfn;
+#endif
+
+    res = f_opendir(&dir, path);                       /* Open the directory */
+    if (res != FR_OK) {
+        // TODO should be mp_type_FileNotFoundError
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "No such file or directory: '%s'", path));
+    }
+
+    mp_obj_t dir_list = mp_obj_new_list(0, NULL);
+
+    for (;;) {
+        res = f_readdir(&dir, &fno);                   /* Read a directory item */
+        if (res != FR_OK || fno.fname[0] == 0) break;  /* Break on error or end of dir */
+        if (fno.fname[0] == '.' && fno.fname[1] == 0) continue;             /* Ignore . entry */
+        if (fno.fname[0] == '.' && fno.fname[1] == '.' && fno.fname[2] == 0) continue;             /* Ignore .. entry */
+
+#if _USE_LFN
+        char *fn = *fno.lfname ? fno.lfname : fno.fname;
+#else
+        char *fn = fno.fname;
+#endif
+
+        /*
+        if (fno.fattrib & AM_DIR) {
+            // dir
+        } else {
+            // file
+        }
+        */
+
+        // make a string object for this entry
+        mp_obj_t entry_o;
+        if (is_str_type) {
+            entry_o = mp_obj_new_str(fn, strlen(fn), false);
+        } else {
+            entry_o = mp_obj_new_bytes((const byte*)fn, strlen(fn));
+        }
+
+        // add the entry to the list
+        mp_obj_list_append(dir_list, entry_o);
+    }
+
+    f_closedir(&dir);
+
+    return dir_list;
+}
+
+#endif // MICROPY_VFS_FAT