Fixes editing of files that does not end on EOL.

At load, all files are patched with an EOL at the end. Also, simplify
EOL logic now that the parser correctly parses the last line.

src/cmdline.bas

@@ -79,7 +79,7 @@ PROC SaveCompiledFile
     bput #1, @@ZP_INTERP_LOAD, @@ZP_INTERP_SIZE
     bput #1, @__PREHEAD_RUN__, @COMP_RT_SIZE
     ' Note, the compiler writes to "NewPtr" the end of program code
-    bput #1, MemEnd + 1, NewPtr - MemEnd
+    bput #1, MemEnd, NewPtr - MemEnd
     if err() < 128
       ' Save ok, close
       close #1
@@ -121,8 +121,8 @@ PROC CompileFile
   ' Compile main file
   poke MemEnd, $9B
   ? "Compiling..."
-  dpoke @@RELOC_OFFSET, @BYTECODE_ADDR - MemEnd - 1
-  if USR( @compile_buffer, Adr(MemStart), MemEnd+1)
+  dpoke @@RELOC_OFFSET, @BYTECODE_ADDR - MemEnd
+  if USR( @compile_buffer, Adr(MemStart), MemEnd)
     ' Parse error, show
     ? " at line "; dpeek(@@linenum); " column "; peek( @@bmax )
   else

src/editor.bas

@@ -149,9 +149,9 @@ ENDPROC
 PROC CompileAndSave
   exec ClrTopLine
   ' Pass the relocation offset, the compiled code
-  ' is run at "BYTECODE_ADDR" instead of "MemEnd + 1",
+  ' is run at "BYTECODE_ADDR" instead of "MemEnd",
   ' the output buffer.
-  dpoke @@RELOC_OFFSET, @BYTECODE_ADDR - MemEnd - 1
+  dpoke @@RELOC_OFFSET, @BYTECODE_ADDR - MemEnd
   exec CompileFile
 ENDPROC
 
@@ -160,8 +160,7 @@ ENDPROC
 PROC CompileFile
   ' Compile main file
   ? "Parsing: ";
-  poke MemEnd, $9B
-  if USR( @compile_buffer, Adr(MemStart), MemEnd+1)
+  if USR( @compile_buffer, Adr(MemStart), MemEnd)
     ' Parse error, go to error line
     topLine = dpeek(@@linenum) - 11
     column = peek( @@bmax )
@@ -645,9 +644,10 @@ ENDPROC
 '-------------------------------------
 ' Fix empty buffer
 PROC CheckEmptyBuf
-  if MemEnd = adr(MemStart)
-    poke adr(MemStart), $9b
+  poke MemEnd, $9B
+  if peek(MemEnd-1) <> $9B
     MemEnd = MemEnd + 1
+    poke MemEnd, $9b
   endif
 ENDPROC