s1 was 0 length, and replstr was 0 length, etc., we would end up subtracting
one from zero and seeing if it was greater than the size_t (unsigned) var
maxsize... This would cause us to return a string consisting of essentially
only match, which is not the right behaviour if we have 0 length inpline.
corrupt memory. Simplifies the code in one or two places, also removes some
code that looks like it was bogus or incomplete.
Update strnsubst to have one or two extra conditions which maybe would make
it more efficient, or at least more versatile. This is likely a no-op.
Merge xargs(1) with that of xMach.
Bring in xargs(1) changes to add -L and -I as per the Single Unix Specification
version 3. Proper exit status numbers are implemented, and the manual page has
been updated to reflect reality.
The code has been ANSIfied, and a new file has been added to xargs(1) to do the
substring substitution as SUSv3 requires.
Traditional behaviour should not be affected, use of -J should be deprecated
in favor of the more portable -I (though -J has been left, for now).
Submitted by: me, tjr (the exit status stuff)
Obtained from: xMach
