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

components/libc/compilers/dlib/syscall_lseek.c

@@ -0,0 +1,47 @@
+/*
+ * 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 <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.lseek"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__lseek" function makes the next file operation (__read or
+ * __write) act on a new location.  The parameter "whence" specifies
+ * how the "offset" parameter should be interpreted according to the
+ * following table:
+ *
+ *  0 (=SEEK_SET) - Goto location "offset".
+ *  1 (=SEEK_CUR) - Go "offset" bytes from the current location.
+ *  2 (=SEEK_END) - Go to "offset" bytes from the end.
+ *
+ * This function should return the current file position, or -1 on
+ * failure.
+ */
+
+#pragma module_name = "?__lseek"
+
+long __lseek(int handle, long offset, int whence)
+{
+    if (handle == _LLIO_STDOUT ||
+        handle == _LLIO_STDERR ||
+        handle == _LLIO_STDIN)
+        return _LLIO_ERROR;
+#ifdef DFS_USING_POSIX
+    return lseek(handle, offset, whence);
+#else
+    LOG_W(_WARNING_WITHOUT_FS);
+    return _LLIO_ERROR;
+#endif /* DFS_USING_POSIX */
+}