Add original unix v6

source/m6/m6.h

@@ -0,0 +1,66 @@
+
+struct { 
+	int word; 
+};
+
+struct {		/*"put stack", currently gathering args*/
+	int prev;	/*previous frame ptr, self-relative*/
+	int pan;	/*argument number of arg being collected*/
+	int pa0;	/*self-relative ptr oo arg0*/
+#define pend 6
+};
+
+struct {		/*"get stack", currently expanding macros*/
+	int prev;	/* prev frame ptr, self-realtive*/
+	int mframe;	/* ptr to macro definition frame*/
+	int mchar;	/* next char relative to def. frame*/
+	int marg;	/* 0 or ptr to next arg char reltive to gf*/
+	int ga0;	/* arg0 ptr self-rel*/
+};
+
+struct {		/*"definition stack"*/
+	int prev;	/* prev frame ptr, self-relative*/
+	int dswitch;	/* builtin func code, neg for dead definition*/
+	int dtext;	/* definition text prt rel to df*/
+	int dident;	/* first char of identifier naming def*/
+#define dend 6
+};
+
+char metas[];
+#define lquote metas[0]
+#define rquote metas[1]
+#define sharp metas[2]
+#define colon metas[3]
+#define semi metas[4]
+#define comma metas[5]
+#define dollar metas[6]
+#define NMETA 7
+
+char one[];
+int rescan;
+int traceflag;
+int trashflag;		/* nonzero when dead def'n exist*/
+
+int lp;			/* arg collection level (out level)*/
+int lg;			/*input level (get level) */
+int lq;		/*quote level*/
+int l9;			/*apparent call level within arg 9*/
+
+char c;			/*current input character*/
+
+char *pf;		/*put stack frame ptr*/
+char *pe;		/*put stack end*/
+char *pmax;		/*top of put stack*/
+char p0[];		/*put stack*/
+
+char *gf;		/*get stack frame ptr*/
+char *ge;		/*get stack end*/
+char *gmax;		/*get stack limit*/
+char g0[];		/*get stack*/
+
+char *df;		/*definition stack frame ptr*/
+char *de;		/*def stack end*/
+char *dmax;		/*def stack limit*/
+char d0[];		/*def stack*/
+
+char dummy[];		/*dummy empty macro*/