support slash-ended mkdir, such as "mkdir dir/".

Signed-off-by: 田昕 <tianxin7@xiaomi.com>

lfs.c

@@ -1399,7 +1399,8 @@ static lfs_stag_t lfs_dir_find(lfs_t *lfs, lfs_mdir_t *dir,
                     LFS_MKTAG(0x780, 0, 0),
                     LFS_MKTAG(LFS_TYPE_NAME, 0, namelen),
                      // are we last name?
-                    (strchr(name, '/') == NULL) ? id : NULL,
+                    (((strchr(name, '/') != NULL) && (strcspn(name, "/") == strlen(name) - 1)) ||
+                    (strchr(name, '/') == NULL)) ? id : NULL,
                     lfs_dir_find_match, &(struct lfs_dir_find_match){
                         lfs, name, namelen});
             if (tag < 0) {
@@ -2408,7 +2409,8 @@ static int lfs_rawmkdir(lfs_t *lfs, const char *path) {
     }
 
     // check that name fits
-    lfs_size_t nlen = strlen(path);
+    // if name ends with slash, ignore it
+    lfs_size_t nlen = (strlen(path) > 0 && path[strlen(path) - 1] == '/') ? strlen(path) - 1 : strlen(path);
     if (nlen > lfs->name_max) {
         return LFS_ERR_NAMETOOLONG;
     }