Change the behavior of IFS word-splitting: split words

when the current character is IFS space and the last
character was a word character or it was non-white IFS
space and the current character is non-white IFS space.
This deviates from the previous behavior because the
latter splits words when the last character is any IFS
space and the current is non-white IFS, resulting in
more fields most of the time.

This new behavior follows what the man page describes;
i.e., that a field is delimited by one or more IFS
whitespace characters followed by zero or one non-white
IFS characters.

Requires addition of a new substitution expansion state
to handle the special case of empty fields at the
beginning.

testing by naddy
ok jmc, millert, otto, deraadt

0 files changed, 0 insertions, 0 deletions