regress tests shouldn't set or modify MALLOC_OPTIONS unless they're actually very specific behaviour

document this accordingly in the guidelines section of the manpage

ok bluhm@

Just in case another developer besides anton@ and myself even wants to
look at these tests: add a comment providing a high-level picture of
what is going on here, such that everyday maintenance can be performed
without going down the rabbit hole of subr.sh and edit.c.

As in emacs.sh -r1.11 by jca, don't test the behavior of ^L. With
millert's clear-screen change in vi.c -r1.57 it now depends on $TERM

Make the edit regress tests respect the KSH variable just like the main regress
tests. Makes it easier to run all tests using another binary:

$ pwd
/usr/src/regress/bin/ksh
$ make KSH=/usr/src/bin/ksh/obj/ksh

Add missing RCS IDs and zap redundant SRCS from Makefile.

The first version of the edit program used to test csh, ksh and mail was based
on the following reasoning: once the program to test has written some data it
has entered the main-loop and is by now ready to receive user input. At this
point it should be safe to start writing input and once the program once again
enters a blocking reading state, its done processing the input. This approach
was sensitive to timing and determining when a shell is done processing its
input (if ever) is tricky.

This iteration of the edit program takes a new approach and uses presence of a
prompt for synchronisation of I/O. It doesn't solve all problems but is a step
in the right direction.

Joint work with bluhm@

Favor a UID-agnostic prompt in ksh edit mode tests. Allows the tests to pass
when executed as root.

Spotted by bluhm@

Fix EOL tests for ksh vi mode.

Add new edit regress files.

Absent from my previous commit.

Just in case another developer besides anton@ and myself even wants to
look at these tests: add a comment providing a high-level picture of
what is going on here, such that everyday maintenance can be performed
without going down the rabbit hole of subr.sh and edit.c.

As in emacs.sh -r1.11 by jca, don't test the behavior of ^L. With
millert's clear-screen change in vi.c -r1.57 it now depends on $TERM

Make the edit regress tests respect the KSH variable just like the main regress
tests. Makes it easier to run all tests using another binary:

$ pwd
/usr/src/regress/bin/ksh
$ make KSH=/usr/src/bin/ksh/obj/ksh

Add missing RCS IDs and zap redundant SRCS from Makefile.

The first version of the edit program used to test csh, ksh and mail was based
on the following reasoning: once the program to test has written some data it
has entered the main-loop and is by now ready to receive user input. At this
point it should be safe to start writing input and once the program once again
enters a blocking reading state, its done processing the input. This approach
was sensitive to timing and determining when a shell is done processing its
input (if ever) is tricky.

This iteration of the edit program takes a new approach and uses presence of a
prompt for synchronisation of I/O. It doesn't solve all problems but is a step
in the right direction.

Joint work with bluhm@

Favor a UID-agnostic prompt in ksh edit mode tests. Allows the tests to pass
when executed as root.

Spotted by bluhm@

Fix EOL tests for ksh vi mode.

Add new edit regress files.

Absent from my previous commit.

As in emacs.sh -r1.11 by jca, don't test the behavior of ^L. With
millert's clear-screen change in vi.c -r1.57 it now depends on $TERM

Make the edit regress tests respect the KSH variable just like the main regress
tests. Makes it easier to run all tests using another binary:

$ pwd
/usr/src/regress/bin/ksh
$ make KSH=/usr/src/bin/ksh/obj/ksh

Add missing RCS IDs and zap redundant SRCS from Makefile.

The first version of the edit program used to test csh, ksh and mail was based
on the following reasoning: once the program to test has written some data it
has entered the main-loop and is by now ready to receive user input. At this
point it should be safe to start writing input and once the program once again
enters a blocking reading state, its done processing the input. This approach
was sensitive to timing and determining when a shell is done processing its
input (if ever) is tricky.

This iteration of the edit program takes a new approach and uses presence of a
prompt for synchronisation of I/O. It doesn't solve all problems but is a step
in the right direction.

Joint work with bluhm@

Favor a UID-agnostic prompt in ksh edit mode tests. Allows the tests to pass
when executed as root.

Spotted by bluhm@

Fix EOL tests for ksh vi mode.

Add new edit regress files.

Absent from my previous commit.

Make the edit regress tests respect the KSH variable just like the main regress
tests. Makes it easier to run all tests using another binary:

$ pwd
/usr/src/regress/bin/ksh
$ make KSH=/usr/src/bin/ksh/obj/ksh

Add missing RCS IDs and zap redundant SRCS from Makefile.

The first version of the edit program used to test csh, ksh and mail was based
on the following reasoning: once the program to test has written some data it
has entered the main-loop and is by now ready to receive user input. At this
point it should be safe to start writing input and once the program once again
enters a blocking reading state, its done processing the input. This approach
was sensitive to timing and determining when a shell is done processing its
input (if ever) is tricky.

This iteration of the edit program takes a new approach and uses presence of a
prompt for synchronisation of I/O. It doesn't solve all problems but is a step
in the right direction.

Joint work with bluhm@

Favor a UID-agnostic prompt in ksh edit mode tests. Allows the tests to pass
when executed as root.

Spotted by bluhm@

Fix EOL tests for ksh vi mode.

Add new edit regress files.

Absent from my previous commit.