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-m4 - macro processor
-
-PD m4 is based on the macro tool distributed with the software 
-tools (VOS) package, and described in the "SOFTWARE TOOLS" and 
-"SOFTWARE TOOLS IN PASCAL" books. It has been expanded to include 
-most of the command set of SysV m4, the standard UN*X macro processor.
-
-Since both PD m4 and UN*X m4 are based on SOFTWARE TOOLS macro,
-there may be certain implementation similarities between
-the two. The PD m4 was produced without ANY references to m4
-sources.
-
-written by: Ozan S. Yigit
-
-References:
-
-	Software Tools distribution: macro
-
-	Kernighan, Brian W. and P. J. Plauger, SOFTWARE
-	TOOLS IN PASCAL, Addison-Wesley, Mass. 1981
-
-	Kernighan, Brian W. and P. J. Plauger, SOFTWARE
-	TOOLS, Addison-Wesley, Mass. 1976
-
-	Kernighan, Brian W. and Dennis M. Ritchie,
-	THE M4 MACRO PROCESSOR, Unix Programmer's Manual,
-	Seventh Edition, Vol. 2, Bell Telephone Labs, 1979
-
-	System V man page for M4
-
-
-Implementation Notes:
-
-[1]	PD m4 uses a different (and simpler) stack mechanism than the one 
-	described in Software Tools and Software Tools in Pascal books. 
-	The triple stack thing is replaced with a single stack containing 
-	the call frames and the arguments. Each frame is back-linked to a 
-	previous stack frame, which enables us to rewind the stack after 
-	each nested call is completed. Each argument is a character pointer 
-	to the beginning of the argument string within the string space.
-	The only exceptions to this are (*) arg 0 and arg 1, which are
-	the macro definition and macro name strings, stored dynamically
-	for the hash table.
-
-	    .					   .
-	|   .	|  <-- sp			|  .  |
-	+-------+				+-----+
-	| arg 3 ------------------------------->| str |
-	+-------+				|  .  |
-	| arg 2 --------------+ 		   .
-	+-------+	      |
-	    *		      |			|     |
-	+-------+	      | 		+-----+
-	| plev	|  <-- fp     +---------------->| str |
-	+-------+				|  .  |
-	| type	|				   .
-	+-------+
-	| prcf	-----------+		plev: paren level
-	+-------+  	   |		type: call type
-	|   .	| 	   |		prcf: prev. call frame
-	    .	   	   |
-	+-------+	   |
-	|	<----------+
-	+-------+