USG_PG3/usr/source/neqn/e0.c
int dbg;
int lp[80]; /* stack for things like piles and matrices */
int ct; /* pointer to lp */
int used[100]; /* available registers */
int ps; /* dflt init pt size */
int deltaps 3; /* default change in ps */
int ft; /* dflt font */
int first;
int ifile;
int linect; /* line number in file */
int eqline; /* line where eqn started */
int svargc;
char **svargv;
int eht[100];
int ebase[100];
int lfont[100];
int rfont[100];
int tht[30];
int tbase[30];
int ptr;
struct {
char *nptr;
char *sptr;
} deftab[100];
int eqnreg, eqnht;
int lefteq, righteq;
int lastchar; /* last character read by lex */