extern int yywrap(void);
extern void setfname(Cell *);
extern int constnode(Node *);
extern char *strnode(Node *);
extern Node *notnull(Node *);
extern int yyparse(void);
extern int yylex(void);
extern void startreg(void);
extern int input(void);
extern void unput(int);
extern void unputstr(char *);
extern int yylook(void);
extern int yyback(int *, int);
extern int yyinput(void);
extern fa *makedfa(char *, int);
extern fa *mkdfa(char *, int);
extern int makeinit(fa *, int);
extern void penter(Node *);
extern void freetr(Node *);
extern int hexstr(char **);
extern int quoted(char **);
extern char *cclenter(char *);
extern void overflo(char *);
extern void cfoll(fa *, Node *);
extern int first(Node *);
extern void follow(Node *);
extern int member(int, char *);
extern int match(fa *, char *);
extern int pmatch(fa *, char *);
extern int nematch(fa *, char *);
extern Node *reparse(char *);
extern Node *regexp(void);
extern Node *primary(void);
extern Node *concat(Node *);
extern Node *alt(Node *);
extern Node *unary(Node *);
extern int relex(void);
extern int cgoto(fa *, int, int);
extern void freefa(fa *);
extern int pgetc(void);
extern Node *nodealloc(int);
extern Node *exptostat(Node *);
extern Node *node1(int, Node *);
extern Node *node2(int, Node *, Node *);
extern Node *node3(int, Node *, Node *, Node *);
extern Node *node4(int, Node *, Node *, Node *, Node *);
extern Node *stat3(int, Node *, Node *, Node *);
extern Node *op2(int, Node *, Node *);
extern Node *op1(int, Node *);
extern Node *stat1(int, Node *);
extern Node *op3(int, Node *, Node *, Node *);
extern Node *op4(int, Node *, Node *, Node *, Node *);
extern Node *stat2(int, Node *, Node *);
extern Node *stat4(int, Node *, Node *, Node *, Node *);
extern Node *celltonode(Cell *, int);
extern Node *rectonode(void);
extern Node *makearr(Node *);
extern Node *pa2stat(Node *, Node *, Node *);
extern Node *linkum(Node *, Node *);
extern void defn(Cell *, Node *, Node *);
extern int isarg(char *);
extern char *tokname(int);
extern Cell *(*proctab[])(Node **, int);
extern void syminit(void);
extern void arginit(int, char **);
extern void envinit(char **);
extern Array *makesymtab(int);
extern void freesymtab(Cell *);
extern void freeelem(Cell *, char *);
extern Cell *setsymtab(char *, char *, double, unsigned int, Array *);
extern int hash(char *, int);
extern void rehash(Array *);
extern Cell *lookup(char *, Array *);
extern double setfval(Cell *, double);
extern void funnyvar(Cell *, char *);
extern char *setsval(Cell *, char *);
extern double getfval(Cell *);
extern char *getsval(Cell *);
extern char *tostring(char *);
extern char *qstring(char *, int);
extern void recinit(unsigned int);
extern void initgetrec(void);
extern void makefields(int, int);
extern void growfldtab(int n);
extern int getrec(char **, int *, int);
extern void nextfile(void);
extern int readrec(char **buf, int *bufsize, FILE *inf);
extern char *getargv(int);
extern void setclvar(char *);
extern void fldbld(void);
extern void cleanfld(int, int);
extern void newfld(int);
extern int refldbld(char *, char *);
extern void recbld(void);
extern Cell *fieldadr(int);
extern void yyerror(char *);
extern void fpecatch(int);
extern void bracecheck(void);
extern void bcheck2(int, int, int);
extern void error(int, char *);
extern void eprint(void);
extern void bclass(int);
extern double errcheck(double, char *);
extern int isclvar(char *);
#ifdef isnumber
#undef isnumber
#endif
extern int isnumber(char *);
extern int adjbuf(char **pb, int *sz, int min, int q, char **pbp, char *what);
extern void run(Node *);
extern Cell *execute(Node *);
extern Cell *program(Node **, int);
extern Cell *call(Node **, int);
extern Cell *copycell(Cell *);
extern Cell *arg(Node **, int);
extern Cell *jump(Node **, int);
extern Cell *getline(Node **, int);
extern Cell *getnf(Node **, int);
extern Cell *array(Node **, int);
extern Cell *awkdelete(Node **, int);
extern Cell *intest(Node **, int);
extern Cell *matchop(Node **, int);
extern Cell *boolop(Node **, int);
extern Cell *relop(Node **, int);
extern void tfree(Cell *);
extern Cell *gettemp(void);
extern Cell *field(Node **, int);
extern Cell *indirect(Node **, int);
extern Cell *substr(Node **, int);
extern Cell *sindex(Node **, int);
extern int format(char **, int *, char *, Node *);
extern Cell *awksprintf(Node **, int);
extern Cell *awkprintf(Node **, int);
extern Cell *arith(Node **, int);
extern double ipow(double, int);
extern Cell *incrdecr(Node **, int);
extern Cell *assign(Node **, int);
extern Cell *cat(Node **, int);
extern Cell *pastat(Node **, int);
extern Cell *dopa2(Node **, int);
extern Cell *split(Node **, int);
extern Cell *condexpr(Node **, int);
extern Cell *ifstat(Node **, int);
extern Cell *whilestat(Node **, int);
extern Cell *dostat(Node **, int);
extern Cell *forstat(Node **, int);
extern Cell *instat(Node **, int);
extern Cell *bltin(Node **, int);
extern Cell *printstat(Node **, int);
extern Cell *nullproc(Node **, int);
extern FILE *redirect(int, Node *);
extern FILE *openfile(int, char *);
extern char *filename(FILE *);
extern Cell *closefile(Node **, int);
extern void closeall(void);
extern Cell *sub(Node **, int);
extern Cell *gsub(Node **, int);
extern FILE *popen(const char *, const char *);
extern int pclose(FILE *);