In addition, although this problem and solution was
for linux 2.2.19 and below, the original problem
disappeared with 2.2.20pre9 which included modifications
to the lxdialog subidr code. BUT, it introduced
new problems which aren't as severe as the 2.2.19 problem.
Here is a breakdown.
Problem:
A). pertains to 2.2.19 and below kernels.
when selecting menu options "Processor family" or
"Maximum Physical Memory" under menuconfig, the menu
structure for each of these selections is displayed
partially missing. What is displayed is the following:
a). a blue background, b). the title for kernel config,
c). a partial menu with a gray background but the grey
box doesn't contain the title (in yellow) nor the
text message at the top of the grey box, "Use arrow
keys....." and the Select/help text.
The part of the menu that is displayed is from the
top of the menu down to the location where the
menu box that is checked with an X is at. So if the
first menu selection is checked, that is all you see.
If the last menu selection is checked, then you see
the whole menu. If a menu selection in the middle is
checked, then only from the beginning to that menu
option is shown.
d). If the up/down cursor is moved a couple of menu
selections up or down, then the display
will refresh and display properly until you exit
and reenter the menu option viewed and then
item (c) reoccurs.
Problem #2:
A). pertains to 2.2.19 and 2.2.20pre9 kernels.
a). I guess you know that when the letters "S" and "E" are
used as possible one character selection in the menu
list, it overrides the capability associated with
"Select" and "Exit". I.E. see the main menu since
"Scsi support" has "S" and so does "Select", but
"Scsi support" is selected when "S" is typed, and
not "Select" no matter how many times "S" is entered.
However, the arrow keys still work to make selection.
Problem #3:
A). pertains to 2.2.20pre9 kernels.
a). when selecting menu options "Processor family" or
"Maximum Physical Memory" under menuconfig, the menu
structure for each of these selections is displayed
as follows:
1). The "Select" option is highlighted.(ok!)
2). The "Exit" button option is MISSING.(Broke!)
All other screens have it.
3). The menu selection currently checked
is highlighted. HOWEVER, the cursor
on the screen isn't placed on the selection
checked but is put on the "Help" option. (Broke!)
All other screens always highlight
the first menu option since there are multiple
selections with data instead of multiple
selections with just one option.(this is OK!).
What changed:
History: In kernel version 2.2.1 to 2.2.19pre7 the above
problem #1 didn't exist, but when the kernel
patch to 2.2.19pre8 was applied that changed
the "C" software code that dealt with
"make menuconfig", the above problem started
occuring and is still occuring with the latest
2.2 kernels. I didn't complain about it since
I thought it would be eventually fixed -- it hasn't
been. Therefore, I started investigating the
cause.
What changed in patch:
a). a couple of statements
wmove(....)
wrefresh(...)/wnoutrefresh(...)
wgetch(...)
b). some code logic in,
menubox.c
checklist.c
that added "If(selected)" .... statements.
c). some code commented out in,
checklist.c
Solution to Problem #1 (2.2.19 and below):
a). in the pre-patch-2.2.19-8 you commented out two lines in
the file checklist.c. The lines are,
wmove(dialog,y, x+1+ 14*selected):
wrefresh(dialog);
in the function print_buttons(...)
These lines *must* be uncommented to correct my problem so that
I don't have to move the cursor to get the screen to refresh
and display the screen properly.
My argument is if you were to grep for "selected" in all of the
"C" files in the lxdialog directory, you would see other "C"
programs that use similar statements (except the 14 is a
different number). If the above statements caused some type
of problem, then I'd expect all of the other routines, which
are similar, to have similar types of problems: yet they aren't
commented out. See the print_buttons() function in menubox.c
yesno.c etc. If you can't recreate this problem, then comment
all lines in the "C" code in the subdir lxdialog that look
similar to the above two statements but may have different numbers.
Then do "make menuconfig" and start selecting things.
The second part of my argument is that alot of the "C" programs
have the same function name i.e. print_buttons(..) that have
the same parameter list, but different variables, and do the
same type of processing, but with different data. I suggest
that *alot* of the redundancy of the functions be eliminated
to ease code maintenance and prevent s/w functionality from
being broke. I realize that some function calls with the
same name have a few more parameters than the other, but NULLs
could be passed as dummy data for example.
The third part of my argument is that all print_item(..) functions
defs *have* the "if (selected)" logic added and are consistent, thus
all routines which are similar (see argument #2) should be the same.
In this example, they are the same/consistent and justifies my
argument in #2 about the commented out statements. see "C" programs
checklist.c and menubox.c.
Solution to Problems #2 and #3: unknown!
System:
I have Linux 2.2.19 (and now 2.2.20pre9) with egcs v1.1.2 and libc
v2.0.6 and ncurses v5.0beta1 (this has never been a problem since I
compiled it for linux 2.2.1 and up, along with other apps using
it. Thus this version *isn't* the issue with the above problem).
Hardware: Dell 333mhz intel Optiplex.
Conclusion:
a). Uncomment the code mentioned above.
b). Restructure the lxdialog code based around a common
set of function calls to eliminate redundancy, but called
with the necessary parameters to implement the necessary
functionality. Eases s/w maintenance and establishes
consistency in programming logic. IMHO.
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