Wrong foreground colors with TERM=linux-16color using ncurses

[Dino Petrucci]

There is a problem with colors in the Linux console by defining
TERM="linux-16color" with the actual terminfo database (rev. 1.742).
Vim, GNU Emacs, and other programs that use ncurses with foreground
colors from 0 to 7 display just one color.  Attachments show three cases
(I ran 'M-x list-colors-display' within 'emacs -q'):

   linux.png  [all right]
      $ export TERM="linux"

   linux16_21.png  [wrong]
      $ export TERM="linux-16color"

The problem could be solved by changing the string definition (see
'terminfo.src' rev. 1.742 at line 1134) from

   setaf=\E[3%p1%{8}%m%d%?%p1%{7}%>%t;1%e;21%;m

to

   setaf=\E[3%p1%{8}%m%d%?%p1%{7}%>%t;1%e;22%;m

that is by replacing 21 with 22 in the 'else' statement.  See the third
attachment which shows the correct result, after compiling the database
with the string 'setaf' changed:

   linux16_22.png  [correct]
      $ export TERM="linux-16color"

'man 4 console_codes', section 'ECMA-48 Set Graphics Rendition', reports
that parameter 21 'set normal intensity (ECMA-48 says "doubly
underlined")'; I think ncurses considers 21 as "doubly underlined"
somewhere.  Instead the parameter 22 gives the correct result without
any ambiguity.

Best regards,

Dino Petrucci

linux.png
Description: PNG image

linux16_21.png
Description: PNG image

linux16_22.png
Description: PNG image