From a99f817c234d28c04a49508f48e971888651838b Mon Sep 17 00:00:00 2001
From: li_zan <371442490@qq.com>
Date: Fri, 7 May 2021 11:35:08 +0800
Subject: [PATCH] Add already opened file logic

---
 components/fs/littlefs/lfs_api.c | 23 +++++++++++++++++++++--
 components/fs/littlefs/lfs_api.h |  3 ++-
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/components/fs/littlefs/lfs_api.c b/components/fs/littlefs/lfs_api.c
index b36dee95..d335d9d3 100644
--- a/components/fs/littlefs/lfs_api.c
+++ b/components/fs/littlefs/lfs_api.c
@@ -62,6 +62,21 @@ LittleFsHandleStruct *GetFreeFd(int *fd)
     return NULL;
 }
 
+bool CheckFileIsOpen(const char *fileName, int *fd)
+{
+    for(int i = 0; i < LITTLE_FS_MAX_OPEN_FILES; i++) {
+        if(g_handle[i].useFlag == 1) {
+            if(strcmp(g_handle[i].pathName, fileName) == 0) {
+                *fd = i;
+                return true;
+            }
+        }
+    }
+
+    *fd = INVALID_FD;
+    return false;
+}
+
 lfs_dir_t *GetFreeDir()
 {
     pthread_mutex_lock(&g_FslocalMutex);
@@ -205,16 +220,20 @@ int LfsClosedir(const DIR *dir)
     return lfs_dir_close(&g_lfs, (lfs_dir_t *)dir);
 }
 
-int LfsOpen(const char *path, int openFlag, int mode)
+int LfsOpen(const char *pathName, int openFlag, int mode)
 {
     int fd = INVALID_FD;
 
+    if (CheckFileIsOpen(pathName, &fd)) {
+        return fd;
+    }
+
     LittleFsHandleStruct *fsHandle = GetFreeFd(&fd);
     if (fd == INVALID_FD) {
         goto errout;
     }
 
-    int err = lfs_file_open(&g_lfs, &(fsHandle->file), path, openFlag);
+    int err = lfs_file_open(&g_lfs, &(fsHandle->file), pathName, openFlag);
     if (err != 0) {
         goto errout;
     }
diff --git a/components/fs/littlefs/lfs_api.h b/components/fs/littlefs/lfs_api.h
index 3fed19c4..0f1a9c39 100644
--- a/components/fs/littlefs/lfs_api.h
+++ b/components/fs/littlefs/lfs_api.h
@@ -55,6 +55,7 @@ typedef unsigned mode_t;
 
 typedef struct {
     uint8_t useFlag;
+    const char *pathName;
     lfs_file_t file;
 } LittleFsHandleStruct;
 
@@ -121,7 +122,7 @@ int LfsRmdir(const char *dirName);
 DIR *LfsOpendir(const char *dirName);
 struct dirent *LfsReaddir(DIR *dir);
 int LfsClosedir(const DIR *dir);
-int LfsOpen(const char *path, int openFlag, int mode);
+int LfsOpen(const char *pathName, int openFlag, int mode);
 int LfsRead(int fd, void *buf, unsigned int len);
 int LfsWrite(int fd, const void *buf, unsigned int len);
 int LfsSeek(int fd, off_t offset, int whence);