cmd: Fix handling of lines starting with echo. or echo:.

programs/cmd/tests/test_builtins.cmd.exp

@@ -18,25 +18,25 @@ at-echoed-word
 @pwd@>echo "/?"@space@
 "/?"
 
-@todo_wine@@pwd@>echo.
+@pwd@>echo.
 
 
 @pwd@>echo .@space@
 .
 
-@todo_wine@@pwd@>echo.word
+@pwd@>echo.word
 word
 
 @pwd@>echo .word@space@
 .word
 
-@todo_wine@@pwd@>echo:
+@pwd@>echo:
 
 
 @pwd@>echo :@space@
 :
 
-@todo_wine@@pwd@>echo:word
+@pwd@>echo:word
 word
 
 @pwd@>echo :word@space@

programs/cmd/wcmdmain.c

@@ -1786,10 +1786,22 @@ WCHAR *WCMD_ReadAndParseLine(WCHAR *optionalcmd, CMD_LIST **output, HANDLE readF
     /* Show prompt before batch line IF echo is on and in batch program */
     if (context && echo_mode && extraSpace[0] && (extraSpace[0] != '@')) {
       const WCHAR spc[]={' ','\0'};
+      const WCHAR echoDot[] = {'e','c','h','o','.'};
+      const WCHAR echoCol[] = {'e','c','h','o',':'};
+      const DWORD len = sizeof(echoDot)/sizeof(echoDot[0]);
+      DWORD curr_size = strlenW(extraSpace);
+      DWORD min_len = (curr_size < len ? curr_size : len);
       WCMD_show_prompt();
       WCMD_output_asis(extraSpace);
       /* I don't know why Windows puts a space here but it does */
-      WCMD_output_asis(spc);
+      /* Except for lines starting with 'echo.' or 'echo:'. Ask MS why */
+      if (CompareStringW(LOCALE_SYSTEM_DEFAULT, NORM_IGNORECASE,
+                         extraSpace, min_len, echoDot, len) != CSTR_EQUAL
+          && CompareStringW(LOCALE_SYSTEM_DEFAULT, NORM_IGNORECASE,
+                         extraSpace, min_len, echoCol, len) != CSTR_EQUAL)
+      {
+          WCMD_output_asis(spc);
+      }
       WCMD_output_asis(newline);
     }