ksh: Remove symbol clash with libc

Rename local function twalk() to ksh_twak().
This is needed for installing interceptors in sanitizers.

Sponsored by <The NetBSD Foundation>

Kill enough K&R cruft to build with clang again.

ksh: Eliminate dead function x_complete_word()

ksh: Upgrade to C99 <stdbool.h>

This shell already used C99 functions.

ksh: Drop support for systems without <sys/stat.h>

In future the order of includes will be normalized with KNF.

No functional change intended.

Reapply removal of code from 90ties for OS/2 Cygwin AIX HPUX SCOUnix

Added missing #endif terminator in emacs.c

Temporarily revert previous.

emacs.* gets wrong code in generation

Remove sco unix 3.2v4.1 support (from 1992) from ksh(1)

OK by <kre>

Remove os2 support in ksh(1)

OK by <kre>

Remove ancient cygwin support in ksh(1)

OK by <kre>

PR: 39604
Reviewed by:

add_glob:
Do not stop scanning if we see '$' as it does more harm than good.
For $HOME/tm we should return $HOME/tm*

- int putbuf_func ARGS((const char *s, size_t len));
+ int (*putbuf_func) ARGS((const char *, size_t));

for pcc
- did not recognise pointer to function
- argument names shadowed other arguments

Back out fix for PR 22846 as it has issues. See PR 22846 for details.

Fix most of the -Wsign-compare issues.

* Escape '?', '[', ']' like other meta characters.
* Partial fix for completion when '[' is in the way.
* Addresses PR bin/22846.

Don't free random memory; thanks gcc-4.

Avoid double free.

Coverity CID 2995: Fix memory leak.

Process window size changes after xread(). [change window size]
echo $COLUMS $LINES; will now print the new sizes immediately, instead
of after the second echo. From otto@OpenBSD

warns=3
- remove param names from function decls
- sprinkle const
- rename shadowed variables
- XXX: there is a lot of fishy __UNCONST going on.

Fixed wrong use of the <ctype.h> functions by adding (unsigned char) casts.

Cleanup of ksh memory handling from OpenBSD, via Stefan Krueger in PR 24962.
Should also fix:
PR 8153
PR 13301
PR 15256
PR 25084

Add ':' to the list of characters to be escaped. Fixes completion problems
when the filename includes this character.

From OpenBSD:
revision 1.18
date: 2003/08/22 18:17:10; author: fgsch; state: Exp; lines: +2 -2
in word location, fix forward scanning so it correctly account for any
escaped char and not only spac

From OpenBSD:
revision 1.18
date: 2003/08/22 18:17:10; author: fgsch; state: Exp; lines: +2 -2
in word location, fix forward scanning so it correctly account for any
escaped char and not only spaces.
for "foo (bar.a)" and "foo (bar a)", cd foo\ \(bar.<tab> will correctly
expand to foo\ \(bar.a\).
otto@ and pval@ ok.

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