Truncate a file: Difference between revisions

Content added Content deleted

Inline

@@ Line 625: / Line 625: @@
 -- @param {string} filename
 -- @param {integer} length
--- @return {bool}
+-- @return {bool} success
 ----------------------------------------
 on truncate (filename, length)
   fp = xtra("fileIO").new()
   fp.openFile(filename, 0)
-  data = fp.readByteArray(length)
   if fp.status() then return false
+  if fp.getLength()=length then
+    -- noting to do
+    fp.closeFile()
+    return true
+  end if
+  data = fp.readByteArray(length)
+  if data.length<>length then
+    fp.closeFile()
+    return false
+  end if
   fp.delete()
   fp.createFile(filename)
   fp.openFile(filename, 2)
   fp.writeByteArray(data)
-  err = fp.status()
+  ok = fp.status()=0
   fp.closeFile()
+  return ok
-  fp=0
-  return (err=0)
 end</lang>
 But there are also free plugins ("Xtras") like e.g. "BinFile Xtra" that support "in-file" truncation: