Checkpoint: pull in mpm; merge pic from Taj's version of the world

src/cmd/mpm/slug.h

@@ -0,0 +1,74 @@
+enum slugtypes {
+	NONE,		// can't happen
+	VBOX,		// Vertical Box -- printable stuff
+	SP,		// paddable SPace
+	BS,		// start Breakable Stream
+	US,		// start Unbreakable Stream
+	BF,		// start Breakable Float
+	UF,		// start Unbreakable Float
+	PT,		// start Page Top material (header)
+	BT,		// start page BoTtom material (footer)
+	END,		// ENDs of groups
+	NEUTRAL,	// NEUTRALized slugs can do no harm (cf. CIA)
+	PAGE,		// beginning of PAGE in troff input
+	TM,		// Terminal Message to appear during output
+	COORD,		// output page COORDinates
+	NE,		// NEed command
+	MC,		// Multiple-Column command
+	CMD,		// misc CoMmanDs:  FC, FL, BP
+	PARM,		// misc PARaMeters:  NP, FO
+	LASTTYPE	// can't happen either
+};
+
+enum cmdtypes {
+	FC,	// Freeze 2-Column material
+	FL,	// FLush all floats before reading more stream
+	BP	// Break Page
+};
+
+enum parmtypes {
+	NP,	// distance of top margin from page top (New Page)
+	FO,	// distance of bottom margin from page top (FOoter)
+	PL,	// distance of physical page bottom from page top (Page Length)
+	MF,	// minimum fullness required for padding
+	CT,	// tolerance for division into two columns
+	WARN,	// warnings to stderr?	
+	DBG	// debugging flag
+};
+
+class slug {
+	int	serialnum;
+	int	dp;		// offset of data for this slug in inbuf
+	int	linenum;	// input line number (approx) for this slug
+	short	font;		// font in effect at slug beginning
+	short	size;		// size in effect at slug beginning
+	short	seen;		// 0 until output
+	short	ncol;		// number of columns (1 or 2)
+	short	offset;		// horizontal offset for 2 columns
+  public:
+	short	type;		// VBOX, PP, etc.
+	short	parm;		// parameter
+	short	base;		// "depth" of this slug (from n command)
+	int	hpos;		// abs horizontal position
+	int	dv;		// height of this slug above its input Vpos
+	union {
+		int	ht;	// "height" of this slug (from n command)
+		int	parm2;	// second parameter, since only VBOXes have ht
+	};
+	friend	slug getslug(FILE *);
+	friend	void checkout();
+	friend	slug eofslug();
+	void	coalesce();	// with next slug in array slugs[]
+	void	neutralize();	// render this one a no-op
+	void	dump();		// dump its contents for debugging
+	char	*headstr();	// string value of text
+	void	slugout(int);	// add the slug to the output
+	char	*typename();	// printable slug type
+	int	serialno()	{ return serialnum; }
+	int	numcol()	{ return ncol; }
+	int	lineno()	{ return linenum; }
+};
+
+// functions in slug.c
+slug	eofslug();
+slug	getslug(FILE *);