/* define _BSD_SOURCE to use ISO C, POSIX, and 4.3BSD things. */
#ifndef _BSD_SOURCE
#define _BSD_SOURCE
#endif
#define _XOPEN_SOURCE  500
#define _LARGEFILE_SOURCE	1
#define _LARGEFILE64_SOURCE	1
#define _FILE_OFFSET_BITS 64
#include <features.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdarg.h>
#define sync __os_sync
#include <unistd.h>
#undef sync
#include <errno.h>
#define __NO_STRING_INLINES
#include <string.h>
#include "math.h"
#include <fcntl.h>
#include <setjmp.h>
#include <float.h>
#include <endian.h>

#define	getwd	infgetwd

#ifndef EMU
typedef struct Proc Proc;
#endif

/*
 * math module dtoa
 * #define __LITTLE_ENDIAN /usr/include/endian.h under linux
 */

#define	nil		((void*)0)

typedef unsigned char	uchar;
typedef signed char	schar;
typedef unsigned short	Rune;
typedef long long int	vlong;
typedef unsigned long long int	uvlong;
typedef unsigned int u32int;
typedef unsigned int	mpdigit;	/* for /sys/include/mp.h */
typedef unsigned short u16int;
typedef unsigned char u8int;
typedef unsigned long uintptr;

#define	USED(x)		if(x){}else{}
#define	SET(x)

#undef nelem
#define	nelem(x)	(sizeof(x)/sizeof((x)[0]))
#undef offsetof
#define	offsetof(s, m)	(ulong)(&(((s*)0)->m))
#undef assert
#define	assert(x)	if(x){}else _assert("x")

/*
 * most mem and string routines are declared by ANSI/POSIX files above
 */

extern	char*	strecpy(char*, char*, char*);
extern	char*	strdup(const char*);
extern	int	cistrncmp(char*, char*, int);
extern	int	cistrcmp(char*, char*);
extern	char*	cistrstr(char*, char*);
extern	int	tokenize(char*, char**, int);

enum
{
	UTFmax		= 3,		/* maximum bytes per rune */
	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
	Runeerror	= 0x80		/* decoding error in UTF */
};

/*
 * rune routines
 */
extern	int	runetochar(char*, Rune*);
extern	int	chartorune(Rune*, char*);
extern	int	runelen(long);
extern	int	runenlen(Rune*, int);
extern	int	fullrune(char*, int);
extern	int	utflen(char*);
extern	int	utfnlen(char*, long);
extern	char*	utfrune(char*, long);
extern	char*	utfrrune(char*, long);
extern	char*	utfutf(char*, char*);
extern	char*	utfecpy(char*, char*, char*);

extern	Rune*	runestrcat(Rune*, Rune*);
extern	Rune*	runestrchr(Rune*, Rune);
extern	int	runestrcmp(Rune*, Rune*);
extern	Rune*	runestrcpy(Rune*, Rune*);
extern	Rune*	runestrncpy(Rune*, Rune*, long);
extern	Rune*	runestrecpy(Rune*, Rune*, Rune*);
extern	Rune*	runestrdup(Rune*);
extern	Rune*	runestrncat(Rune*, Rune*, long);
extern	int	runestrncmp(Rune*, Rune*, long);
extern	Rune*	runestrrchr(Rune*, Rune);
extern	long	runestrlen(Rune*);
extern	Rune*	runestrstr(Rune*, Rune*);

extern	Rune	tolowerrune(Rune);
extern	Rune	totitlerune(Rune);
extern	Rune	toupperrune(Rune);
extern	int	isalpharune(Rune);
extern	int	islowerrune(Rune);
extern	int	isspacerune(Rune);
extern	int	istitlerune(Rune);
extern	int	isupperrune(Rune);

/*
 * malloc
 */
extern	void*	malloc(size_t);
extern	void*	mallocz(ulong, int);
extern	void	free(void*);
extern	ulong	msize(void*);
extern	void*	calloc(size_t, size_t);
extern	void*	realloc(void*, size_t);
extern	void		setmalloctag(void*, ulong);
extern	void		setrealloctag(void*, ulong);
extern	ulong	getmalloctag(void*);
extern	ulong	getrealloctag(void*);
extern	void*	malloctopoolblock(void*);

/*
 * print routines
 */
typedef struct Fmt	Fmt;
struct Fmt{
	uchar	runes;			/* output buffer is runes or chars? */
	void	*start;			/* of buffer */
	void	*to;			/* current place in the buffer */
	void	*stop;			/* end of the buffer; overwritten if flush fails */
	int	(*flush)(Fmt *);	/* called when to == stop */
	void	*farg;			/* to make flush a closure */
	int	nfmt;			/* num chars formatted so far */
	va_list	args;			/* args passed to dofmt */
	int	r;			/* % format Rune */
	int	width;
	int	prec;
	ulong	flags;
};

enum{
	FmtWidth	= 1,
	FmtLeft		= FmtWidth << 1,
	FmtPrec		= FmtLeft << 1,
	FmtSharp	= FmtPrec << 1,
	FmtSpace	= FmtSharp << 1,
	FmtSign		= FmtSpace << 1,
	FmtZero		= FmtSign << 1,
	FmtUnsigned	= FmtZero << 1,
	FmtShort	= FmtUnsigned << 1,
	FmtLong		= FmtShort << 1,
	FmtVLong	= FmtLong << 1,
	FmtComma	= FmtVLong << 1,
	FmtByte	= FmtComma << 1,

	FmtFlag		= FmtByte << 1
};

extern	int	print(char*, ...);
extern	char*	seprint(char*, char*, char*, ...);
extern	char*	vseprint(char*, char*, char*, va_list);
extern	int	snprint(char*, int, char*, ...);
extern	int	vsnprint(char*, int, char*, va_list);
extern	char*	smprint(char*, ...);
extern	char*	vsmprint(char*, va_list);
extern	int	sprint(char*, char*, ...);
extern	int	fprint(int, char*, ...);
extern	int	vfprint(int, char*, va_list);

extern	int	runesprint(Rune*, char*, ...);
extern	int	runesnprint(Rune*, int, char*, ...);
extern	int	runevsnprint(Rune*, int, char*, va_list);
extern	Rune*	runeseprint(Rune*, Rune*, char*, ...);
extern	Rune*	runevseprint(Rune*, Rune*, char*, va_list);
extern	Rune*	runesmprint(char*, ...);
extern	Rune*	runevsmprint(char*, va_list);

extern	int	fmtfdinit(Fmt*, int, char*, int);
extern	int	fmtfdflush(Fmt*);
extern	int	fmtstrinit(Fmt*);
extern	char*	fmtstrflush(Fmt*);
extern	int	runefmtstrinit(Fmt*);
extern	Rune*	runefmtstrflush(Fmt*);

extern	int	fmtinstall(int, int (*)(Fmt*));
extern	int	dofmt(Fmt*, char*);
extern	int	dorfmt(Fmt*, Rune*);
extern	int	fmtprint(Fmt*, char*, ...);
extern	int	fmtvprint(Fmt*, char*, va_list);
extern	int	fmtrune(Fmt*, int);
extern	int	fmtstrcpy(Fmt*, char*);
extern	int	fmtrunestrcpy(Fmt*, Rune*);
/*
 * error string for %r
 * supplied on per os basis, not part of fmt library
 */
extern	int	errfmt(Fmt *f);

/*
 * quoted strings
 */
extern	char	*unquotestrdup(char*);
extern	Rune	*unquoterunestrdup(Rune*);
extern	char	*quotestrdup(char*);
extern	Rune	*quoterunestrdup(Rune*);
extern	int	quotestrfmt(Fmt*);
extern	int	quoterunestrfmt(Fmt*);
extern	void	quotefmtinstall(void);
extern	int	(*doquote)(int);

/*
 * random number
 */
extern	ulong	truerand(void);
extern	ulong	ntruerand(ulong);

/*
 * math
 */
extern	int	isNaN(double);
extern	int	isInf(double, int);

/*
 * Time-of-day
 */

typedef struct Tm Tm;
struct Tm {
	int	sec;
	int	min;
	int	hour;
	int	mday;
	int	mon;
	int	year;
	int	wday;
	int	yday;
	char	zone[4];
	int	tzoff;
};
extern	vlong	osnsec(void);
#define	nsec	osnsec
	
/*
 * one-of-a-kind
 */
extern	void	_assert(char*);
extern	double	charstod(int(*)(void*), void*);
extern	char*	cleanname(char*);
//extern	ulong	getcallerpc(void*);
extern	int	getfields(char*, char**, int, int, char*);
extern	char*	getuser(void);
extern	char*	getwd(char*, int);
extern	double	ipow10(int);
#define	pow10	infpow10
extern	double	pow10(int);
extern	vlong	strtoll(const char*, char**, int);
extern	uvlong	strtoull(const char*, char**, int);
extern	void	sysfatal(char*, ...);
extern	int	dec64(uchar*, int, char*, int);
extern	int	enc64(char*, int, uchar*, int);
extern	int	dec32(uchar*, int, char*, int);
extern	int	enc32(char*, int, uchar*, int);
extern	int	dec16(uchar*, int, char*, int);
extern	int	enc16(char*, int, uchar*, int);
extern	int	encodefmt(Fmt*);

/*
 *  synchronization
 */
typedef
struct Lock {
	int	val;
	int	pid;
} Lock;

extern int	_tas(int*);

extern	void	lock(Lock*);
extern	void	unlock(Lock*);
extern	int	canlock(Lock*);

typedef struct QLock QLock;
struct QLock
{
	Lock	use;			/* to access Qlock structure */
	Proc	*head;			/* next process waiting for object */
	Proc	*tail;			/* last process waiting for object */
	int	locked;			/* flag */
};

extern	void	qlock(QLock*);
extern	void	qunlock(QLock*);
extern	int	canqlock(QLock*);
extern	void	_qlockinit(ulong (*)(ulong, ulong));	/* called only by the thread library */

typedef
struct RWLock
{
	Lock	l;			/* Lock modify lock */
	QLock	x;			/* Mutual exclusion lock */
	QLock	k;			/* Lock for waiting writers */
	int	readers;		/* Count of readers in lock */
} RWLock;

extern	int	canrlock(RWLock*);
extern	int	canwlock(RWLock*);
extern	void	rlock(RWLock*);
extern	void	runlock(RWLock*);
extern	void	wlock(RWLock*);
extern	void	wunlock(RWLock*);

/*
 * network dialing
 */
#define NETPATHLEN 40

/*
 * system calls
 *
 */
#define	STATMAX	65535U	/* max length of machine-independent stat structure */
#define	DIRMAX	(sizeof(Dir)+STATMAX)	/* max length of Dir structure */
#define	ERRMAX	128	/* max length of error string */

#define	MORDER	0x0003	/* mask for bits defining order of mounting */
#define	MREPL	0x0000	/* mount replaces object */
#define	MBEFORE	0x0001	/* mount goes before others in union directory */
#define	MAFTER	0x0002	/* mount goes after others in union directory */
#define	MCREATE	0x0004	/* permit creation in mounted directory */
#define	MCACHE	0x0010	/* cache some data */
#define	MMASK	0x0017	/* all bits on */

#define	OREAD	0	/* open for read */
#define	OWRITE	1	/* write */
#define	ORDWR	2	/* read and write */
#define	OEXEC	3	/* execute, == read but check execute permission */
#define	OTRUNC	16	/* or'ed in (except for exec), truncate file first */
#define	OCEXEC	32	/* or'ed in, close on exec */
#define	ORCLOSE	64	/* or'ed in, remove on close */
#define	OEXCL	0x1000	/* or'ed in, exclusive use (create only) */

#define	AEXIST	0	/* accessible: exists */
#define	AEXEC	1	/* execute access */
#define	AWRITE	2	/* write access */
#define	AREAD	4	/* read access */

/* bits in Qid.type */
#define QTDIR		0x80		/* type bit for directories */
#define QTAPPEND	0x40		/* type bit for append only files */
#define QTEXCL		0x20		/* type bit for exclusive use files */
#define QTMOUNT		0x10		/* type bit for mounted channel */
#define QTAUTH		0x08		/* type bit for authentication file */
#define QTFILE		0x00		/* plain file */

/* bits in Dir.mode */
#define DMDIR		0x80000000	/* mode bit for directories */
#define DMAPPEND	0x40000000	/* mode bit for append only files */
#define DMEXCL		0x20000000	/* mode bit for exclusive use files */
#define DMMOUNT		0x10000000	/* mode bit for mounted channel */
#define DMAUTH		0x08000000	/* mode bit for authentication file */
#define DMREAD		0x4		/* mode bit for read permission */
#define DMWRITE		0x2		/* mode bit for write permission */
#define DMEXEC		0x1		/* mode bit for execute permission */

typedef
struct Qid
{
	uvlong	path;
	ulong	vers;
	uchar	type;
} Qid;

typedef
struct Dir {
	/* system-modified data */
	ushort	type;	/* server type */
	uint	dev;	/* server subtype */
	/* file data */
	Qid	qid;	/* unique id from server */
	ulong	mode;	/* permissions */
	ulong	atime;	/* last read time */
	ulong	mtime;	/* last write time */
	vlong	length;	/* file length */
	char	*name;	/* last element of path */
	char	*uid;	/* owner name */
	char	*gid;	/* group name */
	char	*muid;	/* last modifier name */
} Dir;

extern	Dir*	dirstat(char*);
extern	Dir*	dirfstat(int);
extern	int	dirwstat(char*, Dir*);
extern	int	dirfwstat(int, Dir*);
extern	long	dirread(int, Dir**);
extern	void	nulldir(Dir*);
extern	long	dirreadall(int, Dir**);

typedef
struct Waitmsg
{
	int pid;	/* of loved one */
	ulong time[3];	/* of loved one & descendants */
	char	*msg;
} Waitmsg;

extern	void	_exits(char*);

extern	void	exits(char*);
extern	int	create(char*, int, int);
extern	int	errstr(char*, uint);

extern	void	perror(const char*);
extern	long	readn(int, void*, long);
extern	int	remove(const char*);
extern	void	rerrstr(char*, uint);
extern	vlong	seek(int, vlong, int);
extern	int	segflush(void*, ulong);
extern	void	werrstr(char*, ...);

extern char *argv0;
#define	ARGBEGIN	for((argv0||(argv0=*argv)),argv++,argc--;\
			    argv[0] && argv[0][0]=='-' && argv[0][1];\
			    argc--, argv++) {\
				char *_args, *_argt;\
				Rune _argc;\
				_args = &argv[0][1];\
				if(_args[0]=='-' && _args[1]==0){\
					argc--; argv++; break;\
				}\
				_argc = 0;\
				while(*_args && (_args += chartorune(&_argc, _args)))\
				switch(_argc)
#define	ARGEND		SET(_argt);USED(_argt);USED(_argc); USED(_args);}USED(argv); USED(argc);
#define	ARGF()		(_argt=_args, _args="",\
				(*_argt? _argt: argv[1]? (argc--, *++argv): 0))
#define	EARGF(x)	(_argt=_args, _args="",\
				(*_argt? _argt: argv[1]? (argc--, *++argv): ((x), abort(), (char*)0)))

#define	ARGC()		_argc

/*
 *	Extensions for Inferno to basic libc.h
 */

#define	setbinmode()

/* need the inline because the link register is not saved in a known location */
static __inline ulong getcallerpc(void* dummy) {
	ulong lr;
 	__asm__(	"mov	%0, %%lr;" 
 			: "=r" (lr) 
 	); 
	return lr;
}

/*
 *	Extensions for emu kernel emulation
 */
#ifdef	EMU

/*
 * This structure must agree with FPsave and FPrestore asm routines
 */
typedef struct FPU FPU;
struct FPU
{
	uchar	env[28];
};

/*
 * Later versions of Linux seemed to need large stack for gethostbyname()
 * so we had this at 128k, which is excessive.  More recently, we've
 * reduced it again after testing stack usage by gethostbyname.
 */
#define KSTACK (16 * 1024)

static __inline Proc *getup(void) {
	Proc* p;
 	__asm__(	"mov	%0, %%sp;" 
 			: "=r" (p) 
 	); 
        return *(Proc **)((unsigned long)p & ~(KSTACK - 1));
};

#define	up	(getup())

typedef sigjmp_buf osjmpbuf;
#define	ossetjmp(buf)	sigsetjmp(buf, 1)

#endif
