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

components/libc/compilers/dlib/syscall_open.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+* Change Logs:
+* Date           Author       Notes
+* 2015-01-28     Bernard      first version
+*/
+
+#include <rtthread.h>
+#include <LowLevelIOInterface.h>
+#include <fcntl.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.open"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__open" function opens the file named "filename" as specified
+ * by "mode".
+ */
+
+#pragma module_name = "?__open"
+
+int __open(const char *filename, int mode)
+{
+#ifdef DFS_USING_POSIX
+    int handle;
+    int open_mode = O_RDONLY;
+
+    if (mode & _LLIO_CREAT)
+    {
+        open_mode |= O_CREAT;
+
+        /* Check what we should do with it if it exists. */
+        if (mode & _LLIO_APPEND)
+        {
+            /* Append to the existing file. */
+            open_mode |= O_APPEND;
+        }
+
+        if (mode & _LLIO_TRUNC)
+        {
+            /* Truncate the existsing file. */
+            open_mode |= O_TRUNC;
+        }
+    }
+
+    if (mode & _LLIO_TEXT)
+    {
+        /* we didn't support text mode */
+    }
+
+    switch (mode & _LLIO_RDWRMASK)
+    {
+    case _LLIO_RDONLY:
+        break;
+
+    case _LLIO_WRONLY:
+        open_mode |= O_WRONLY;
+        break;
+
+    case _LLIO_RDWR:
+        /* The file should be opened for both reads and writes. */
+        open_mode |= O_RDWR;
+        break;
+
+    default:
+        return _LLIO_ERROR;
+    }
+
+    handle = open(filename, open_mode, 0);
+    if (handle < 0)
+    {
+        return _LLIO_ERROR;
+    }
+    return handle;
+#else
+    LOG_W(_WARNING_WITHOUT_FS);
+    return _LLIO_ERROR;
+#endif /* DFS_USING_POSIX */
+}