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coherent

Fri Jul 10 22:45:42 1992 PDT
		V3.3.3: extensive changes to implement shell functions,
		as per specification provided by hal.
sh.h
		Added tokens NFUNC, NRET and shell function type SHFUNC.
		Added declarations for globals sh_fnp, in_sh_fn, ret_done.
sh.y
		Added tokens _PARENS and _RET and syntax for return
		and shell functions.
lex.c
		Added "return" (_RET) and "()" (_PARENS).
extern.c
		Added globals sh_fnp, in_sh_fn, ret_done.
exec1.c
		In command(), added cases NFUNC (shell function definitions)
		and NRET (return) and ret_done references to change control
		flow after return.  Added call to sh_fn() to look for shell
		function calls.
exec2.c
		In clone(), reset global sh_fnp to NULL in child so that
		forked processes do not inherit shell functions.
exec3.c
		Added code to implement shell function definition and execution.
		lookup_sh_fn() looks up a shell function name,
		def_sh_fn() defines a shell function, and
		sh_fn() executes a shell function if appropriate.
		Auxilliary routines copy_node() and free_node() do
		the messiest part of the job.

Tue Jul 14 15:06:56 1992 PDT
sh.h
		Redefined NODE so that -VSINU compilation is no longer required.
lex.c
		Added hashing to keyword lookup.

Mon Mar 22 11:25:47 1993 PST
exec1.c
		Integrated changes from non-function version, cf. sh/Changes.

Fri May  7 05:34:29 1993 PDT
exec3.c
		V4.0.5: In sh_fn, added code to save and restore sesp->s_con.
		michael discovered that a shell function called from ANDAND
		within a while-loop caused the old version to core dump.
		The modified version essentially runs the shell function
		in its own "break/continue" context, then restores the previous
		"break/continue" context.

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