src/bin/expr, branch releng/5.2

Get this area compiling with the highest WARNS= that it works with.

2003-06-13T07:04:02+00:00

Obsolete WFORMAT= junk also removed where possible.

OK'ed by:	obrien
Tested on:	sparc64, alpha, i386

mdoc(7) police:

2002-11-26T17:55:41+00:00

Revert to using the .Tn POSIX and .Tn ANSI instead of \*[Px] and \*[Ai]
strings; using these strings is unsafe in troff mode, as they include a
change in a font size.

Approved by:	re

mdoc(7) police: markup fixes.

2002-11-25T13:20:30+00:00

Approved by:	re

Create a small library function, check_utility_compat(3), to determine

2002-10-28T00:15:43+00:00

whether a named utility should behave in FreeBSD 4.x-compatible mode
or in a standard mode (default standard).  The configuration is done
malloc(3)-style, with either an environment variable or a symlink.

Update expr(1) to use this new interface.

mdoc(7) police: markup nits.

2002-05-29T15:18:35+00:00

EXPR_COMPAT should imply -e, since there is no way to specify it otherwise,

2002-05-11T03:08:12+00:00

and -e reflects the historic behavior of FreeBSD's expr.

The response to my POSIX interpretation request says that `expr'

2002-05-10T22:59:29+00:00

is required to be oblivious to overflow and to use the data type `long'.
(Division by zero is undefined in ISO C so it's still OK to check for it
here.)  Add a new `-e' flag to get the old, more useful behavior.

Provide an environment variabloe, EXPR_COMPAT, which disables option

2002-04-22T21:23:09+00:00

parsing for compatibility with old implementations.

Disable -Werror when building -- the old version of gcc used on IA32 can't

2002-03-23T00:44:00+00:00

deal with C99 formats.

Typo (if => of).

2002-03-22T20:49:29+00:00