Fixed length records: Difference between revisions

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@@ Line 972: / Line 972: @@
 <lang Nim>import algorithm
+proc reverse(infile, outfile: string) =
-let input = "infile.dat".open(fmRead)
-let output = "outfile.dat".open(fmWrite)
-var buffer: array[80, byte]
-while not input.endOfFile:
+  let input = infile.open(fmRead)
-  let countRead = input.readBytes(buffer, 0, 80)
+  defer: input.close()
+  let output = outfile.open(fmWrite)
-  if countRead < 80:
+  defer: output.close()
-    raise newException(IOError, "truncated data when reading")
-  buffer.reverse()
-  let countWrite = output.writeBytes(buffer, 0, 80)
-  if countWrite < 80:
-    raise newException(IOError, "truncated data when writing")
+  var buffer: array[80, byte]
-input.close()
+  while not input.endOfFile:
-output.close()</lang>
+    let countRead = input.readBytes(buffer, 0, 80)
+    if countRead < 80:
+      raise newException(IOError, "truncated data when reading")
+    buffer.reverse()
+    let countWrite = output.writeBytes(buffer, 0, 80)
+    if countWrite < 80:
+      raise newException(IOError, "truncated data when writing")
+reverse("infile.dat", "outfile.dat")</lang>
 {{out}}