OS_390

*os_390.txt*    For Vim version 6.1.  Last change: 2001 Sep 08


		  VIM REFERENCE MANUAL	  by Ralf Schandl


							*OS390* *os390*
This file contains the particularities for the OS/390 Unix version of Vim.

1. Your feedback is needed		|OS390-feedback|
2. Building VIM for OS/390 Unix		|OS390-building|
3. ASCII/EBCDIC dependent scripts	|OS390-has-ebcdic|
4. Xterm Problems			|OS390-xterm|
5. Motif Problems			|OS390-Motif|
6. Known weaknesses			|OS390-weaknesses|
7. Changes				|OS390-changes|

The port to OS/390 Unix was done by Ralf Schandl <schandl@de.ibm.com>
for the redbook mentioned below.

DISCLAIMER:
Also I am an IBMer, IBM is not responsible for this port, this is my
private fun. If you have problems with this port, please contact me.

If you want to use more Open Source Software on OS/390 Unix have a look
at the following Redbook (www.redbooks.ibm.com):

    Mike MacIsaak et al
    "Open Source Software on OS/390 Unix"
    SG24-5944-00

AFAIK a new edition of this redbook will be released in 2001.

Changes or bugreports or both by:

	David Moore
	Anthony Giorgio
	and others

1. Your feedback is needed				*OS390-feedback*

A lot of changes had to be done to the code to get Vim on OS/390 Unix. As most
Unix programs it contained heavy ASCII dependencies. It might be, that I
missed a ASCII dependency or that a new one has been added with a new feature
or bug fix. Most programmers are simply not aware of possible ASCII/EBCDIC
problems. If you hit a problem, that seems related to this, feel free to
contact me at the email address above.

Only if you report a bug, it is possible to fix it. Don't rely on someone else
reporting it! Also see the section |bug-reports|.

2. Building VIM for OS/390 Unix				*OS390-building*

A word on debugging code first: 

The normal run of configure adds the flag '-g' to the compiler options,
to include debugging information into the executable. This information
are normally removed from the executable with the strip command during
installation. On OS/390 Unix, it is not possible to remove this from
the executable. The strip command exists on OS/390 Unix and is called
during the installation, but in fact it just does nothing.

If you want to build Vim without debugging code, export the environment
variable CFLAGS set to an empty string, before you call configure.
>
	export CFLAGS=""
<


Building without X11: 

Note: I always used cc to build Vim, I never tried c89.

If you build VIM without X11 support, compiling and building is
straightforward, but don't forget to export _CC_CCMODE=1 before calling
configure and make.
>
    $ export _CC_CCMODE=1
    $./configure --with-features=big --without-x --enable-gui=no
    $ make
    $ make test
<
	Note: Test 11 will fail, if you don't have gzip installed.
	Test 42 will fail, as VIM on OS/390 Unix doesn't support the multibyte
	feature. (David Moore: "Doesn't work _yet_!  :-)  I'll see what I
	can do.")
	As of 07. September 2001 Test 45 (folding) fails.
>

    $ make install
<


Building with X11: 

There are two ways for building VIM with X11 support. You can link it
statically with the X11 libraries or can bind it with the X11 DLLs. The
statical link results in a huge executable (~13Mb), the dynamical linked
executable is much smaller (~4.5Mb).

Here is what you do, if you want Motif:

  a) Static link >
	$ configure --with-features=big --enable-gui=motif
	$ make
<
     VIM is now linked statically with the X11 libraries.

  b) Dynamic link:
     Make VIM as described for the static link. Then change the contense of
     the 'auto/link.sed' file by appending: >
	s%-lXm  *%/usr/lib/Xm.x %g
	s%-lX11  *%/usr/lib/X11.x %g
	s%-lSM  *%/usr/lib/SM.x %g
	s%-lICE  *%/usr/lib/ICE.x %g
<
     Then do: >
	$ rm vim
	$ make
<
     Now Vim is linked with the X11-DLLs.

See the Makefile and the file link.sh on how link.sed is used.

3. ASCII/EBCDIC dependent scripts			*OS390-has-ebcdic*

For the internal script language the feature "ebcdic" was added. With this
you can fix ASCII dependent scripts like this:
>
    if has("ebcdic")
	let space = 64
    else
	let space = 32
    endif
<

4. XTerm problems					*OS390-xterm*

I saw one problem with XTerm on OS390 Unix.  The terminal code for moving the
cursor to the left is wrong in the termlib database.  Perhaps not wrong, but
it didn't work with VIM syntax highlighting and command line cursor movement.

If the highlighting is messed up while you type, but is ok after you refreshed
the screen with <C-L> or if you can't move to the left with the cursor key on
the command line, try adding >
        :set t_le=^H
<
to your .vimrc. NOTE: '^H' is one character, hit <C-V><C-H> to get it.

5. Motif Problems					*OS390-Motif*

It seems that in the Motif library a translation from EBCDIC to ASCII for
Mnemonic chars of the menus were forgotten. Even after I tried some
conversion by hand, it still only works for opening menus (like <Alt-F> to
open the file menu), but doesn't work for the menu items (like <Alt-F>O to
open the file browser). No solution for this yet.

6. Known weaknesses					*OS390-weaknesses*

- No binary search in tag files.
  The program /bin/sort sorts by ASCII value by default. This program is
  normally used by ctags to sort the tags. There might be a version of
  ctags out there, that does it right, but we can't be sure. So this seems to
  be a permanent restriction.

- Multibyte support (utf-8) doesn't work, it's disabled at compile time.
  (|multibyte|)


Never tested:
    - Perl interface		(|perl|)
    - Hangul input		(|hangul|)
    - Cscope interface		(|cscope|)
    - Encryption support	(|encryption|)
    - Langmap			(|'langmap'|)
    - Python support		(|Python|)
    - Right-to-left mode	(|'rightleft'|)
    - SNiFF+ interface		(|sniff|)
    - TCL interface		(|tcl|)
    ....

If you try on of this and it works drop me a note!!

7. Changes						*OS390-changes*

This doesn't include all changes made for EBCDIC/OS390, but is just a
reference for me.

6.0au:
  Changed configure.in
  Changed documentation.
  Anthony Giorgio fixed the errorbell.

  David Moore found some problems, which were fixed by Bram and/or David for
  6.0au.

6.0q (alpha):
  Minor changes for nrformats=alpha (see |'nrformats'|).
  Problem with hardcoded keycode for the english pound sign. Added a define in
  ascii.h
  Disabled multibyte for EBCDIC in feature.h

6.0f (alpha):
  First compile of Vim 6 on OS/390 Unix. Some minor changes were needed.

  Finally found the reason why make from the toplevel didn't work (I must have
  been blind before!). The Makefile contained a list of targets in one target
  line. On all other Unixes the macro $@ evaluates to the first target in this
  list, only on OS/390 Unix it evaluates to the last one :-(.

5.6-390d:
  Cleaned up some hacks.

5.6-390c:

  I greped thru the source and examined every spot with a character
  involved in a operation (+-). I hope I now found all EBCDIC/ASCII
  stuff, but ....

  Fixed:
    - fixed warning message in do_fixdel()
    - fixed translation from Ctrl-Char to symbolic name (like ^h to CTRL-H)
	    for :help
    - fixed yank/delete/... into register
    - fixed :register command
    - fixed viminfo register storing
    - fixed quick-access table in findoptions()
    - fixed 'g^H' select mode
    - fixed tgetstr() 'get terminal capability string', ESC and
	    Ctrl chars where wrong. (Not used on OS 390 Unix)


  ctags:
    - added trigraphs support (used in prolog of system header files)
	    (get.c)
    - fixed sorting order with LC_COLLATE=S390 to force EBCDIC sorting.
	    (sort.c)


5.6-390b:
  Changed:
    - configure.in:
	- added test for OS/390 Unix
	- added special compiler and linker options if building with X11
    - configure:
	- after created via autoconf handedited it to make the test for
	  ICEConnectionNumber work. This is a autoconf problem. OS/390 Unix
	  needs -lX11 for this.
    - Makefile
	- Don't include the lib directories ('-L...') into the variable
	  ALL_LIBS. Use own variable ALL_LIB_DIRS instead. A fully POSIX
	  compliant compiler must not accept objects/libraries and options
	  mixed. Now we can call the linker like this:

	    $(CC) $(LDFLAGS) $(ALL_LIB_DIRS) $(OBJ) $(ALL_LIBS)

  Fixed:
    - Double quote couldn't be entered
      Missed ASCII dependencies while setting up terminal
      In ASCII 127 is the delete char, in EBCDIC codepage 1047 the value 127
      is the double quote.
    - fixed ':fixdel'

5.6-390a:
  first alpha release for OS/390 Unix.

  Addition:
    - For the internal script language I added the feature "ebcdic".
      This can be queried with the has()-function of the internal
      script language.

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