K 10
svn:author
V 6
jilles
K 8
svn:date
V 27
2010-10-24T20:45:13.006666Z
K 7
svn:log
V 612
sh: Make sure defined functions can actually be called.

Add some conservative checks on function names:
- Disallow expansions or quoting characters; these can only be called via
  strange control characters
- Disallow '/'; these functions cannot be called anyway, as exec.c assumes
  they are pathnames
- Make the CTL* bytes work properly in function names.

These are syntax errors.

POSIX does not require us to support more than names (letters, digits and
underscores, not starting with a digit), but I do not want to restrict it
that much at this time.

Exp-run done by:	pav (with some other sh(1) changes)

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