/*
Derived from Inferno include/kern.h and
Plan 9 from User Space include/libc.h

http://code.google.com/p/inferno-os/source/browse/include/kern.h
http://code.swtch.com/plan9port/src/tip/include/libc.h

	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
	Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
	Portions Copyright © 2001-2007 Russ Cox.  All rights reserved.
	Portions Copyright © 2009 The Go Authors.  All rights reserved.
	Portions Copyright © 2010 Corpus Callosum Corporation.  All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

/*
 * Lib9 is miscellany from the Plan 9 C library that doesn't
 * fit into libutf or into libfmt, but is still missing from traditional
 * Unix C libraries.
 */
#ifndef _LIBC_H_
#define _LIBC_H_ 1
#if defined(__cplusplus)
extern "C" {
#endif

#include <utf.h>
#include <fmt.h>

/*
 * Begin trimmed down usual libc.h
 */

#ifndef nil
#define	nil	((void*)0)
#endif
#define	nelem(x)	(sizeof(x)/sizeof((x)[0]))

#ifndef offsetof
#define offsetof(s, m)	(ulong)(&(((s*)0)->m))
#endif

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

extern	int	getfields(char*, char**, int, int, char*);
extern	int	gettokens(char *, char **, int, char *);

#define	ERRMAX	128	/* max length of error string */

#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	ODIRECT	128	/* or'ed in, direct access */
#define	ONONBLOCK 256	/* or'ed in, non-blocking call */
#define	OEXCL	0x1000	/* or'ed in, exclusive use (create only) */
#define	OLOCK	0x2000	/* or'ed in, lock after opening */
#define	OAPPEND	0x4000	/* or'ed in, append only */

/* 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 QTTMP		0x04		/* type bit for non-backed-up file */
#define QTSYMLINK	0x02		/* type bit for symbolic link */
#define QTFILE		0x00		/* type bits for 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 DMTMP		0x04000000	/* mode bit for non-backed-up file */
#define DMSYMLINK	0x02000000	/* mode bit for symbolic link (Unix, 9P2000.u) */
#define DMDEVICE	0x00800000	/* mode bit for device file (Unix, 9P2000.u) */
#define DMNAMEDPIPE	0x00200000	/* mode bit for named pipe (Unix, 9P2000.u) */
#define DMSOCKET	0x00100000	/* mode bit for socket (Unix, 9P2000.u) */
#define DMSETUID	0x00080000	/* mode bit for setuid (Unix, 9P2000.u) */
#define DMSETGID	0x00040000	/* mode bit for setgid (Unix, 9P2000.u) */

#define DMREAD		0x4		/* mode bit for read permission */
#define DMWRITE		0x2		/* mode bit for write permission */
#define DMEXEC		0x1		/* mode bit for execute permission */

enum
{
	RFNAMEG		= (1<<0),
	RFENVG		= (1<<1),
	RFFDG		= (1<<2),
	RFNOTEG		= (1<<3),
	RFPROC		= (1<<4),
	RFMEM		= (1<<5),
	RFNOWAIT	= (1<<6),
	RFCNAMEG	= (1<<10),
	RFCENVG		= (1<<11),
	RFCFDG		= (1<<12)
/*	RFREND		= (1<<13), */
/*	RFNOMNT		= (1<<14) */
};

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 */

	/* 9P2000.u extensions */
	uint	uidnum;		/* numeric uid */
	uint	gidnum;		/* numeric gid */
	uint	muidnum;	/* numeric muid */
	char	*ext;		/* extended info */
} Dir;
	
extern	void	werrstr(char*, ...);
	
	/* compiler directives on plan 9 */
#define	SET(x)	((x)=0)
#define	USED(x)	if(x){}else{}
#ifdef __GNUC__
#	if __GNUC__ >= 3
#		undef USED
#		define USED(x) ((void)(x))
#	endif
#endif


#if defined(__cplusplus)
}
#endif
#endif	/* _LIB9_H_ */