lv_fs: add lv_fs_trunc and lv_fs_rename

lv_misc/lv_fs.c

@@ -245,6 +245,26 @@ lv_fs_res_t lv_fs_tell(lv_fs_file_t * file_p, uint32_t  * pos)
     return res;
 }
 
+/**
+ * Truncate the file size to the current position of the read write pointer
+ * @param file_p pointer to an 'ufs_file_t' variable. (opened with lv_fs_open )
+ * @return LV_FS_RES_OK: no error, the file is read
+ *         any error from lv_fs_res_t enum
+ */
+lv_fs_res_t lv_fs_trunc (lv_fs_file_t * file_p)
+{
+    if(file_p->drv == NULL) {
+        return LV_FS_RES_INV_PARAM;
+    }
+
+    if(file_p->drv->tell == NULL) {
+        return LV_FS_RES_NOT_IMP;
+    }
+
+    lv_fs_res_t res = file_p->drv->trunc(file_p->file_d);
+
+    return res;
+}
 /**
  * Give the size of a file bytes
  * @param file_p pointer to a lv_fs_file_t variable
@@ -267,6 +287,40 @@ lv_fs_res_t lv_fs_size(lv_fs_file_t * file_p, uint32_t * size)
     return res;
 }
 
+/**
+ * Rename a file
+ * @param oldname path to the file
+ * @param newname path with the new name
+ * @return LV_FS_RES_OK or any error from 'fs_res_t'
+ */
+lv_fs_res_t lv_fs_rename (const char * oldname, const char * newname)
+{
+    if(!oldname || !newname) return LV_FS_RES_INV_PARAM;
+
+    char letter = oldname[0];
+
+    lv_fs_drv_t * drv = lv_fs_get_drv(letter);
+
+    if(!drv) {
+        return LV_FS_RES_NOT_EX;
+    }
+
+    if(drv->ready != NULL) {
+        if(drv->ready() == false) {
+            return LV_FS_RES_HW_ERR;
+        }
+    }
+
+    if(drv->rename == NULL) return LV_FS_RES_NOT_IMP;
+
+    const char * old_real = lv_fs_get_real_path(oldname);
+    const char * new_real = lv_fs_get_real_path(newname);
+    lv_fs_res_t res = drv->rename(old_real, new_real);
+
+    return res;
+}
+
+
 /**
  * Initialize a 'fs_read_dir_t' variable for directory reading
  * @param rddir_p pointer to a 'fs_read_dir_t' variable
@@ -313,6 +367,7 @@ lv_fs_res_t lv_fs_dir_open(lv_fs_dir_t * rddir_p, const char * path)
 lv_fs_res_t lv_fs_dir_read(lv_fs_dir_t * rddir_p, char * fn)
 {
     if(rddir_p->drv == NULL || rddir_p->dir_d == NULL) {
+        fn[0] = '\0';
         return LV_FS_RES_INV_PARAM;
     }
 

lv_misc/lv_fs.h

@@ -89,6 +89,7 @@ typedef struct __lv_fs_drv_t
     lv_fs_res_t (*tell) (void * file_p, uint32_t * pos_p);
     lv_fs_res_t (*trunc) (void * file_p);
     lv_fs_res_t (*size) (void * file_p, uint32_t * size_p);
+    lv_fs_res_t (*rename) (const char * oldname, const char * newname);
     lv_fs_res_t (*free) (uint32_t * total_p, uint32_t * free_p);
 
     lv_fs_res_t (*dir_open) (void * rddir_p, const char * path);
@@ -171,6 +172,14 @@ lv_fs_res_t lv_fs_seek (lv_fs_file_t * file_p, uint32_t pos);
  */
 lv_fs_res_t lv_fs_tell (lv_fs_file_t * file_p, uint32_t  * pos);
 
+/**
+ * Truncate the file size to the current position of the read write pointer
+ * @param file_p pointer to an 'ufs_file_t' variable. (opened with lv_fs_open )
+ * @return LV_FS_RES_OK: no error, the file is read
+ *         any error from lv_fs_res_t enum
+ */
+lv_fs_res_t lv_fs_trunc (lv_fs_file_t * file_p);
+
 /**
  * Give the size of a file bytes
  * @param file_p pointer to a lv_fs_file_t variable
@@ -179,6 +188,14 @@ lv_fs_res_t lv_fs_tell (lv_fs_file_t * file_p, uint32_t  * pos);
  */
 lv_fs_res_t lv_fs_size (lv_fs_file_t * file_p, uint32_t * size);
 
+/**
+ * Rename a file
+ * @param oldname path to the file
+ * @param newname path with the new name
+ * @return LV_FS_RES_OK or any error from 'fs_res_t'
+ */
+lv_fs_res_t lv_fs_rename (const char * oldname, const char * newname);
+
 /**
  * Initialize a 'fs_dir_t' variable for directory reading
  * @param rddir_p pointer to a 'fs_read_dir_t' variable