/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <bio.h>#include <ctype.h>#include <mach.h> /* * file - determine type of file */#define	LENDIAN(p)	((p)[0] | ((p)[1]<<8) | ((p)[2]<<16) | ((p)[3]<<24)) uchar	buf[6001];short	cfreq[140];short	wfreq[50];int	nbuf;Dir*	mbuf;int	fd;char 	*fname;char	*slash; enum{	Cword,	Fword,	Aword,	Alword,	Lword,	I1,	I2,	I3,	Clatin	= 128,	Cbinary,	Cnull,	Ceascii,	Cutf,};struct{	char*	word;	int	class;} dict[] ={	"PATH",		Lword,	"TEXT",		Aword,	"adt",		Alword,	"aggr",		Alword,	"alef",		Alword,	"array",	Lword,	"block",	Fword,	"char",		Cword,	"common",	Fword,	"con",		Lword,	"data",		Fword,	"dimension",	Fword,	"double",	Cword,	"extern",	Cword,	"bio",		I2,	"float",	Cword,	"fn",		Lword,	"function",	Fword,	"h",		I3,	"implement",	Lword,	"import",	Lword,	"include",	I1,	"int",		Cword,	"integer",	Fword,	"iota",		Lword,	"libc",		I2,	"long",		Cword,	"module",	Lword,	"real",		Fword,	"ref",		Lword,	"register",	Cword,	"self",		Lword,	"short",	Cword,	"static",	Cword,	"stdio",	I2,	"struct",	Cword,	"subroutine",	Fword,	"u",		I2,	"void",		Cword,}; /* codes for 'mode' field in language structure */enum	{		Normal	= 0,		First,		/* first entry for language spanning several ranges */		Multi,		/* later entries "   "       "  ... */		Shared,		/* codes used in several languages */	}; struct{	int	mode;		/* see enum above */	int 	count;	int	low;	int	high;	char	*name; } language[] ={	Normal,	0,	0x0100,	0x01FF,	"Extended Latin",	Normal,	0,	0x0370,	0x03FF,	"Greek",	Normal,	0,	0x0400,	0x04FF,	"Cyrillic",	Normal,	0,	0x0530,	0x058F,	"Armenian",	Normal,	0,	0x0590,	0x05FF,	"Hebrew",	Normal,	0,	0x0600,	0x06FF,	"Arabic",	Normal,	0,	0x0900,	0x097F,	"Devanagari",	Normal,	0,	0x0980,	0x09FF,	"Bengali",	Normal,	0,	0x0A00,	0x0A7F,	"Gurmukhi",	Normal,	0,	0x0A80,	0x0AFF,	"Gujarati",	Normal,	0,	0x0B00,	0x0B7F,	"Oriya",	Normal,	0,	0x0B80,	0x0BFF,	"Tamil",	Normal,	0,	0x0C00,	0x0C7F,	"Telugu",	Normal,	0,	0x0C80,	0x0CFF,	"Kannada",	Normal,	0,	0x0D00,	0x0D7F,	"Malayalam",	Normal,	0,	0x0E00,	0x0E7F,	"Thai",	Normal,	0,	0x0E80,	0x0EFF,	"Lao",	Normal,	0,	0x1000,	0x105F,	"Tibetan",	Normal,	0,	0x10A0,	0x10FF,	"Georgian",	Normal,	0,	0x3040,	0x30FF,	"Japanese",	Normal,	0,	0x3100,	0x312F,	"Chinese",	First,	0,	0x3130,	0x318F,	"Korean",	Multi,	0,	0x3400,	0x3D2F,	"Korean",	Shared,	0,	0x4e00,	0x9fff,	"CJK",	Normal,	0,	0,	0,	0,		/* terminal entry */};  enum{	Fascii,		/* printable ascii */	Flatin,		/* latin 1*/	Futf,		/* UTF character set */	Fbinary,	/* binary */	Feascii,	/* ASCII with control chars */	Fnull,		/* NULL in file */} guess; void	bump_utf_count(Rune);int	cistrncmp(char*, char*, int);void	filetype(int);int	getfontnum(uchar*, uchar**);int	isas(void);int	isc(void);int	iscint(void);int	isenglish(void);int	ishp(void);int	ishtml(void);int	isrfc822(void);int	ismbox(void);int	islimbo(void);int	ismung(void);int	isp9bit(void);int	isp9font(void);int	isrtf(void);int	ismsdos(void);int	iself(void);int	istring(void);int	isoffstr(void);int	iff(void);int	long0(void);int	longoff(void);int	istar(void);int	isface(void);int	isexec(void);int	p9bitnum(uchar*);int	p9subfont(uchar*);void	print_utf(void);void	type(char*, int);int	utf_count(void);void	wordfreq(void); int	(*call[])(void) ={	long0,		/* recognizable by first 4 bytes */	istring,	/* recognizable by first string */	iself,		/* ELF (foreign) executable */	isexec,		/* native executables */	iff,		/* interchange file format (strings) */	longoff,	/* recognizable by 4 bytes at some offset */	isoffstr,	/* recognizable by string at some offset */	isrfc822,	/* email file */	ismbox,		/* mail box */	istar,		/* recognizable by tar checksum */	ishtml,		/* html keywords */	iscint,		/* compiler/assembler intermediate */	islimbo,	/* limbo source */	isc,		/* c & alef compiler key words */	isas,		/* assembler key words */	isp9font,	/* plan 9 font */	isp9bit,	/* plan 9 image (as from /dev/window) */	isrtf,		/* rich text format */	ismsdos,	/* msdos exe (virus file attachement) */	isface,		/* ascii face file */ 	/* last resorts */	ismung,		/* entropy compressed/encrypted */	isenglish,	/* char frequency English */	0}; int mime; char OCTET[] =	"application/octet-stream\n";char PLAIN[] =	"text/plain\n"; voidmain(int argc, char *argv[]){	int i, j, maxlen;	char *cp;	Rune r; 	ARGBEGIN{	case 'm':		mime = 1;		break;	default:		fprint(2, "usage: file [-m] [file...]\n");		exits("usage");	}ARGEND; 	maxlen = 0;	if(mime == 0 || argc > 1){		for(i = 0; i < argc; i++) {			for (j = 0, cp = argv[i]; *cp; j++, cp += chartorune(&r, cp))					;			if(j > maxlen)				maxlen = j;		}	}	if (argc <= 0) {		if(!mime)			print ("stdin: ");		filetype(0);	}	else {		for(i = 0; i < argc; i++)			type(argv[i], maxlen);	}	exits(0);} voidtype(char *file, int nlen){	Rune r;	int i;	char *p; 	if(nlen > 0){		slash = 0;		for (i = 0, p = file; *p; i++) {			if (*p == '/')			/* find rightmost slash */				slash = p;			p += chartorune(&r, p);		/* count runes */		}		print("%s:%*s",file, nlen-i+1, "");	}	fname = file;	if ((fd = open(file, OREAD)) < 0) {		print("cannot open: %r\n");		return;	}	filetype(fd);	close(fd);} voidfiletype(int fd){	Rune r;	int i, f, n;	char *p, *eob; 	free(mbuf);	mbuf = dirfstat(fd);	if(mbuf == nil){		print("cannot stat: %r\n");		return;	}	if(mbuf->mode & DMDIR) {		print(mime ? OCTET : "directory\n");		return;	}	if(mbuf->type != 'M' && mbuf->type != '|') {		print(mime ? OCTET : "special file #%C/%s\n",			mbuf->type, mbuf->name);		return;	}	/* may be reading a pipe on standard input */	nbuf = readn(fd, buf, sizeof(buf)-1);	if(nbuf < 0) {		print("cannot read: %r\n");		return;	}	if(nbuf == 0) {		print(mime ? PLAIN : "empty file\n");		return;	}	buf[nbuf] = 0; 	/*	 * build histogram table	 */	memset(cfreq, 0, sizeof(cfreq));	for (i = 0; language[i].name; i++)		language[i].count = 0;	eob = (char *)buf+nbuf;	for(n = 0, p = (char *)buf; p < eob; n++) {		if (!fullrune(p, eob-p) && eob-p < UTFmax)			break;		p += chartorune(&r, p);		if (r == 0)			f = Cnull;		else if (r <= 0x7f) {			if (!isprint(r) && !isspace(r))				f = Ceascii;	/* ASCII control char */			else f = r;		} else if (r == 0x80) {			bump_utf_count(r);			f = Cutf;		} else if (r < 0xA0)			f = Cbinary;	/* Invalid Runes */		else if (r <= 0xff)			f = Clatin;	/* Latin 1 */		else {			bump_utf_count(r);			f = Cutf;		/* UTF extension */		}		cfreq[f]++;			/* ASCII chars peg directly */	}	/*	 * gross classify	 */	if (cfreq[Cbinary])		guess = Fbinary;	else if (cfreq[Cutf])		guess = Futf;	else if (cfreq[Clatin])		guess = Flatin;	else if (cfreq[Ceascii])		guess = Feascii;	else if (cfreq[Cnull])		guess = Fbinary;	else		guess = Fascii;	/*	 * lookup dictionary words	 */	memset(wfreq, 0, sizeof(wfreq));	if(guess == Fascii || guess == Flatin || guess == Futf)		wordfreq();	/*	 * call individual classify routines	 */	for(i=0; call[i]; i++)		if((*call[i])())			return; 	/*	 * if all else fails,	 * print out gross classification	 */	if (nbuf < 100 && !mime)		print(mime ? PLAIN : "short ");	if (guess == Fascii)		print(mime ? PLAIN : "Ascii\n");	else if (guess == Feascii)		print(mime ? PLAIN : "extended ascii\n");	else if (guess == Flatin)		print(mime ? PLAIN : "latin ascii\n");	else if (guess == Futf && utf_count() < 4)		print_utf();	else print(mime ? OCTET : "binary\n");} voidbump_utf_count(Rune r){	int low, high, mid; 	high = sizeof(language)/sizeof(language[0])-1;	for (low = 0; low < high;) {		mid = (low+high)/2;		if (r >= language[mid].low) {			if (r <= language[mid].high) {				language[mid].count++;				break;			} else low = mid+1;		} else high = mid;	}} intutf_count(void){	int i, count; 	count = 0;	for (i = 0; language[i].name; i++)		if (language[i].count > 0)			switch (language[i].mode) {			case Normal:			case First:				count++;				break;			default:				break;			}	return count;} intchkascii(void){	int i; 	for (i = 'a'; i < 'z'; i++)		if (cfreq[i])			return 1;	for (i = 'A'; i < 'Z'; i++)		if (cfreq[i])			return 1;	return 0;} intfind_first(char *name){	int i; 	for (i = 0; language[i].name != 0; i++)		if (language[i].mode == First			&& strcmp(language[i].name, name) == 0)			return i;	return -1;} voidprint_utf(void){	int i, printed, j; 	if(mime){		print(PLAIN);		return;	}	if (chkascii()) {		printed = 1;		print("Ascii");	} else		printed = 0;	for (i = 0; language[i].name; i++)		if (language[i].count) {			switch(language[i].mode) {			case Multi:				j = find_first(language[i].name);				if (j < 0)					break;				if (language[j].count > 0)					break;				/* Fall through */			case Normal:			case First:				if (printed)					print(" & ");				else printed = 1;				print("%s", language[i].name);				break;			case Shared:			default:				break;			}		}	if(!printed)		print("UTF");	print(" text\n");} voidwordfreq(void){	int low, high, mid, r;	uchar *p, *p2, c; 	p = buf;	for(;;) {		while (p < buf+nbuf && !isalpha(*p))			p++;

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