typedef struct Sym Sym;

#pragma lib "../cc/cc.a$O"

typedef struct Sym Sym;
typedef struct Ref Ref;
typedef struct Gen Gen;
typedef struct Io Io;
typedef struct Hist Hist;

#define FPCHIP 1
#define NSYMB 500
#define BUFSIZ 8192
#define HISTSZ 20
#define NINCLUDE 10
#define NHUNK 10000
#define EOF (-1)
#define IGN (-2)
#define GETC() ((--fi.c < 0)? filbuf(): *fi.p++ & 0xff)
#define NHASH 503
#define STRINGSZ 200
#define NMACRO 10

#define ALLOC(lhs, type)\
while(nhunk < sizeof(type))\
gethunk();\
lhs = (type*)hunk;\
nhunk -= sizeof(type);\
hunk += sizeof(type);

#define ALLOCN(lhs, len, n)\
if(lhs+len != hunk || nhunk < n) {\
while(nhunk <= len)\
gethunk();\
memmove(hunk, lhs, len);\
lhs = hunk;\
hunk += len;\
nhunk -= len;\
}\
hunk += n;\
nhunk -= n;

struct Sym
{
Sym* link;
Ref* ref;
char* macro;
long value;
ushort type;
char name[NNAME];
char sym;
};
#define S ((Sym*)0)

struct Ref
{
int class;
};

struct
{
char* p;
int c;
} fi;

struct Io
{
Io* link;
char b[BUFSIZ];
char* p;
short c;
short f;
};
#define I ((Io*)0)

struct
{
Sym* sym;
short type;
} h[NSYM];

struct Gen
{
Sym* sym;
long offset;
short type;
short reg;
short name;
double dval;
char sval[8];
};

struct Hist
{
Hist* link;
char* name;
long line;
long offset;
};
#define H ((Hist*)0)

enum
{
CLAST,
CMACARG,
CMACRO,
CPREPROC,
};

char debug[256];
Sym* hash[NHASH];
Hist* ehist;
int newflag;
Hist* hist;
char* hunk;
char* include[NINCLUDE];
Io* iofree;
Io* ionext;
Io* iostack;
long lineno;
int nerrors;
long nhunk;
int ninclude;
Gen nullgen;
char* outfile;
int pass;
long pc;
int peekc;
int sym;
char symb[NSYMB];
int thechar;
char* thestring;
long thunk;
Biobuf obuf;

void errorexit(void);
void pushio(void);
void newio(void);
void newfile(char*, int);
Sym* slookup(char*);
Sym* lookup(void);
void syminit(Sym*);
long yylex(void);
int getc(void);
int getnsc(void);
void unget(int);
int escchar(int);
void cinit(void);
void pinit(char*);
void cclean(void);
int isreg(Gen*);
void outcode(int, Gen*, int, Gen*);
void zname(char*, int, int);
void zaddr(Gen*, int);
void ieeedtod(Ieee*, double);
int filbuf(void);
Sym* getsym(void);
void domacro(void);
void macund(void);
void macdef(void);
void macexpand(Sym*, char*);
void macinc(void);
void maclin(void);
void macprag(void);
void macif(int);
void macend(void);
void outhist(void);
void dodefine(char*);
void prfile(long);
void linehist(char*, long);
void gethunk(void);
void yyerror(char*, ...);
int yyparse(void);

/*
* compat
*/
int mywait(void*);
int mycreat(char*, int);
char* myerrstr(int);
int unix(void);