[Bug 58665] New: cmd incorrectly wraps text containing ANSI escape sequences

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58665

Bug ID: 58665
           Summary: cmd incorrectly wraps text containing ANSI escape
                    sequences
           Product: Wine
           Version: 10.14
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: cmd
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 79250
  --> http://bugs.winehq.org/attachment.cgi?id=79250
reproducer: should print 3 lines; wine prints 4 lines

Wine's cmd.exe prematurely inserts line breaks when a program's output contains
non-printable ANSI escape sequences, such as those used to change colors.

It looks as though Wine is counting not only the printable characters in the
program's output, but also the non-printable ones, and using the total to
decide where to insert a line break. Text that fits entirely on one line in a
real Windows console is sometimes broken midway through the line, or followed
by a blank line that should not be there, when run in an xterm using Wine.

I am attaching a batch file that reproduces the problem. It should print 3
lines. The second line is identical to the others with the addition of some
non-printable escape sequences. These characters should either occupy no width
in the terminal (making the line length match the others) or be rendered as
visible placeholder characters (as older Windows versions do). To see Wine
handling it incorrectly, run it in an 80-column xterm or a similar terminal.

Ideally, the output should look like this, with the head of line 2 in red:

79 chars _123456789_123456789_123456789_123456789_123456789_123456789_123456789
79 chars _123456789_123456789_123456789_123456789_123456789_123456789_123456789
79 chars _123456789_123456789_123456789_123456789_123456789_123456789_123456789

In wine, the output looks like this:

79 chars _123456789_123456789_123456789_123456789_123456789_123456789_123456789
79 chars _123456789_123456789_123456789_123456789_123456789_123456789_12
3456789
79 chars _123456789_123456789_123456789_123456789_123456789_123456789_123456789

Bug 49780 is related, but IMHO does not excuse this behavior. Regardless of
whether virtual terminal sequences are supported, Wine should either print a
character or not count it toward the length of a line when deciding where to
wrap it.