Delete support for the LESSOPEN and LESSCLOSE environment variables
aka the "Input Preprocessor": it's been a source for multiple
security bugs in the past as everything has to deal with handling
arb

Delete support for the LESSOPEN and LESSCLOSE environment variables
aka the "Input Preprocessor": it's been a source for multiple
security bugs in the past as everything has to deal with handling
arbitrary filenames and generally resulted in multiple TOCTOU issues.
The base system never included a default LESSOPEN setting like some
Linux distributions did, but it's a suds-filled sink full of knives
to try to use safely.

ok tb@ deraadt@ millert@

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Delete what remains of the support for combining characters into
ligatures: it was incomplete (only for the Arabic script and only
for the single ligature LAM WITH ALEF) and it was implemented in a
w

Delete what remains of the support for combining characters into
ligatures: it was incomplete (only for the Arabic script and only
for the single ligature LAM WITH ALEF) and it was implemented in a
way that is unsustainable (with a static table inside less).

If we ever want ligature support, we are better off making a fresh
start. However, for languages like Arabic and Persian, even that
wouldn't really be useful without having bidirectional support first.

OK millert@
(and also considering comments from Mohammadreza Abdollahzadeh,
Evan Silberman, and benno@)

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New utility function mbtowc_left() because this functionality -
decoding a UTF-8 multibyte character to the left of a given byte -
is already needed at three places in line.c and will also be needed

New utility function mbtowc_left() because this functionality -
decoding a UTF-8 multibyte character to the left of a given byte -
is already needed at three places in line.c and will also be needed
for cleanup work in cmdbuf.c in the future.
OK millert@

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trivial patch to at least make the buggy functions control_char()
and get_wchar() static for now - until they can be deleted

Clean up all major UTF-8 issues in cvt.c.
This also allows to delete the buggy, now unused function put_wchar().
OK millert@

Completely clean up UTF-8 handling in the file filename.c:
Employ the usual form of an mbtowc(3) loop, eliminating two calls
to the bad function step_char() and reducing the number of nested
loops by

Completely clean up UTF-8 handling in the file filename.c:
Employ the usual form of an mbtowc(3) loop, eliminating two calls
to the bad function step_char() and reducing the number of nested
loops by one. This also removes the last caller of the bad function
binary_char(), which is consequently deleted.
While here, count ASCII C0 non-whitespace control characters as
binary (except backspace and, with -R only, escape).
OK millert@

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Start UTF-8 cleanup of store_char(), in particular getting rid of
a call to the flawed function step_char(-1), using the standard
function mbtowc(3) instead.
Merge in in_ansi_esc_seq(), simplifying t

Start UTF-8 cleanup of store_char(), in particular getting rid of
a call to the flawed function step_char(-1), using the standard
function mbtowc(3) instead.
Merge in in_ansi_esc_seq(), simplifying the code, and make the
related functions is_ansi_end() and is_ascii_char() static because
they are used in line.c only.

OK nicm@, and no opposition when shown on tech@

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Split only LESS on $.

As guenther@ said "STOP SPLITTING ANYTHING BUT $LESS ON '$' !".

anton@ came up with the same diff. ok nicm@

Remove the lintism PRINTFLIKE1, don't replace it with an attribute so we
can keep it portable.

also noticed by Michael Reed, discussed with deraadt@

remove needless extern keywords, a vestige of pre-ANSI C

explained by and ok millert@

Remove LINUNUM, a needless alias for off_t. Also, remove a redundant
condition.

ok nicm@

Missing prototype.

remove fancy null check function in favor of checking for null.
from Ricardo Mestre

Add a flag argument to flush() to stop it calling quit() on error, then
use this from quit() to stop less blowing up the stack looping through
quit()/flush() if stderr is closed (for example "less /m

Add a flag argument to flush() to stop it calling quit() on error, then
use this from quit() to stop less blowing up the stack looping through
quit()/flush() if stderr is closed (for example "less /missing
2</dev/null"). ok millert

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close_getchr() is now a noop

replace save() with estrdup() and make estrdup() exit like all the other
ecalloc, etc. functions do.
ok mmcc nicm

time_t is not a long. remove incorrect abstraction around time().
ok nicm

Replace less with the cleaned-up fork of less 458 maintained by Garrett
D'Amore at https://github.com/gdamore/less-fork. This has significantly
less portability goop, has a tidied up code style, uses

Replace less with the cleaned-up fork of less 458 maintained by Garrett
D'Amore at https://github.com/gdamore/less-fork. This has significantly
less portability goop, has a tidied up code style, uses terminfo instead
of termcap, and is has stricter POSIX compliance.

Many of our local changes have been accepted upstream: substantial
remaining local changes are code to read help files from /usr/share
rather than compiling them in, man page and help improvements, and some
tweaks to the default options.

Review and testing by millert, ok deraadt

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Give more(1) its own help file, shorter than the one for less(1).
The helpfile itself was prepared by jmc@, the glue by me.
OK millert@ jmc@

Merge Less 458 plus local patches

ok guenther@, ok jmc@ for man bits

Merge in less 444 plus local changes

ok nicm@

Use interruptible syscalls instead of setjmp/longjmp. This makes
less's signal handlers safe. No one has reported problems so far...

o go back to using a help file instead of embedding it in the binary
o deal with HELPFILE not being defined
o add a SMALL definition to make a smaller less for the boot floppies
This still needs to b

o go back to using a help file instead of embedding it in the binary
o deal with HELPFILE not being defined
o add a SMALL definition to make a smaller less for the boot floppies
This still needs to be pared down a bit for the SMALL case

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Merge in less-381 w/ local changes and remove obsolete files.

$OpenBSD$