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This is an experimental port of the Almquist shell (ash) for ELKS and bcc.
It was ported from the MINIX version found in ftp.funet.fi:/pub/minix/src.

Copyright (C) 1989 Kenneth Almquist.
Copyright (C) 1991 The Regents of the University of California.

Ash is distributed under the terms of the BSD License and the Ash General
Public License. See the file bltin/LICENSE for more information.



Change log:

--------------------------------------------------------------
19980209 Claudio Matsuoka <claudio@conectiva.com>

(*) Initial port (quite trivial).
    Adjusted makefiles for bcc, defined sig_t as int, kicked out some
    stuff not supported by bcc (look for FIXME in comments).

--------------------------------------------------------------
19980216 Vincent Zweije <zweije@xs4all.nl>

FIXES:

(*) waitpid() does not modify the status parameter.
    Initialised status to 0 to fake successful command completion.

(*) waitpid() does not obey the WNOHANG flag.
    Return -1 with EINVAL if WNOHANG requested.

(*) ioctl() does not support the TCGETS operation.
    Therefore, bcc's libc's isatty() does not work well.
    Added a substitute eisatty() for an extra check: assume
        that a character device is a tty (probably okay on elks)

(*) signal() is not supported.
    Made arrangements for ash not to abort on failed signal setting.
    Consequently, signals are just left alone if not available.

TODO:

(*) Extend waitpid() (wait4() system call)
    to handle status and non-blocking.
    Status is necessary for reliable script programming.
    Non-blocking is necessary for job control (probably not that
        important).

(*) Extend ioctl() to handle the TCGETS operation.
    Possibly temporarily move the eisatty() fix to bcc's libc.
    Very useful for interactive programs.

(*) Implement signal handling.
    Necessary for tty signals (^C,^Z) (or the trap builtin).

(*) Implement pipes.
    Ash handled their lack reasonably gracefully.
    Very important for some powerful but easy to use IPC.

--------------------------------------------------------------
19980218 Claudio Matsuoka <claudio@conectiva.com>

(*) Workaround for bcc miscompilation in bltin/expr.c.
    bcc complained about "invalid indirect to indirect" and "invalid label"
    errors.

(*) Workaround for bcc miscompilation in bltin/regexp.c.
    bcc complained about "invalid indirect to indirect" errors.

--------------------------------------------------------------
19980225 Vincent Zweije <zweije@xs4all.nl>

FIXES:

(*) elks now supports the TCGETS ioctl(), so libc's isatty() works again.
    Removed the eisatty() substitute again.

(*) system call read() clobbers register SI containing register variable
    p in preadbuffer() in input.c.  Made workaround.

TODO:

(*) Find out where the read()-clobbers-SI bug originates.

--------------------------------------------------------------
19980603

(*) Optimised using register variables. Code is now about 5K smaller.

(*) Added #define _SMALL_ in shell.h, which when defined removes some
    features that are no use to elks, such as checking for new mail.
--------------------------------------------------------------
20220504 Greg Haerr <greg@censoft.com>

Removed Claudio's workarounds for bcc problems

Activated test/expr builtin in build (was already being compiled in unused)

Changed _SMALL_ to MAIL
--------------------------------------------------------------
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