#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[6000];short	cfreq[140];short	wfreq[50];int	nbuf;Dir	mbuf;int	fd;char 	*fname;char	*slash; enum{	Cword,	Fword,	Aword,	I1,	I2,	I3,	Clatin	= 128,	Cbinary,	Cnull,	Ceascii,	Cutf,};struct{	char*	word;	int	class;	int	length;			/* sizeof of 'word' field */} dict[] ={	"TEXT",		Aword,	4,	"block",	Fword,	5,	"char",		Cword,	4,	"common",	Fword,	6,	"data",		Fword,	4,	"dimension",	Fword,	9,		"double",	Cword,	6,	"extern",	Cword,	6,	"bio",		I2,	3,	"float",	Cword,	5,	"function",	Fword,	8,	"h",		I3,	1,	"include",	I1,	7,	"int",		Cword,	3,	"integer",	Fword,	7,	"libc",		I2,	4,	"long",		Cword,	4,	"real",		Fword,	4,	"register",	Cword,	8,	"short",	Cword,	5,	"static",	Cword,	6,	"stdio",	I2,	5,	"struct",	Cword,	6,	"subroutine",	Fword,	10,	"u",		I2,	1,	"void",		Cword,	4,}; struct{	int 	count;	int	low;	int	high;	char	*name;	} language[] ={	0,	0x0100,	0x01FF,	"Extended Latin",	0,	0x0370,	0x03FF,	"Greek",	0,	0x0400,	0x04FF,	"Cyrillic",	0,	0x0530,	0x058F,	"Armenian",	0,	0x0590,	0x05FF,	"Hebrew",	0,	0x0600,	0x06FF,	"Arabic",	0,	0x0900,	0x097F,	"Devanagari",	0,	0x0980,	0x09FF,	"Bengali",	0,	0x0A00,	0x0A7F,	"Gurmukhi",	0,	0x0A80,	0x0AFF,	"Gujarati",	0,	0x0B00,	0x0B7F,	"Oriya",	0,	0x0B80,	0x0BFF,	"Tamil",	0,	0x0C00,	0x0C7F,	"Telugu",	0,	0x0C80,	0x0CFF,	"Kannada",	0,	0x0D00,	0x0D7F,	"Malayalam",	0,	0x0E00,	0x0E7F,	"Thai",	0,	0x0E80,	0x0EFF,	"Lao",	0,	0x1000,	0x105F,	"Tibetan",	0,	0x10A0,	0x10FF,	"Georgian",	0,	0x3040,	0x30FF,	"Japanese",	0,	0x3100,	0x312F,	"Chinese",	0,	0x3130,	0x318F,	"Korean",	0,	0x3400,	0x3D2F,	"Korean",	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);void	filetype(int);int	getfontnum(uchar *, uchar **);int	isas(void);int	isc(void);int	iscint(void);int	isenglish(void);int	ismung(void);int	isp9bit(void);int	isp9font(void);int	istring(void);int	long0(void);int	p9bitnum(uchar *);int	p9subfont(uchar *);void	print_utf(void);int	short0(void);void	type(char*, int);int	utf_count(void);void	wordfreq(void); int	(*call[])(void) ={	long0,		/* recognizable by first 4 bytes */	short0,		/* recognizable by first 2 bytes */	istring,	/* recognizable by first string */	iscint,		/* c intermediate */	isc,		/* c compiler key words */	isas,		/* assembler key words */	ismung,		/* entropy compressed/encrypted */	isenglish,	/* char frequency English */	isp9font,	/* plan 9 font */	isp9bit,	/* plan 9 bitmap (as from /dev/window) */	0}; voidmain(int argc, char *argv[]){	int i, j, maxlen;	char *cp;	Rune r; 	maxlen = 0;	for(i = 1; i < argc; i++) {		for (j = 0, cp = argv[i]; *cp; j++, cp += chartorune(&r, cp))				;		if(j > maxlen)			maxlen = j;	}	if (argc <= 1) {		print ("stdin: ");		filetype(0);	}	else {		for(i = 1; i < argc; i++)			type(argv[i], maxlen);	}	exits(0);} voidtype(char *file, int nlen){	Rune r;	int i;	char *p; 	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\n");		return;	}	filetype(fd);	close(fd);} voidfiletype(int fd){	Rune r;	int i, f;	char *p; 	if(dirfstat(fd, &mbuf) < 0) {		print("cannot stat\n");		return;	}	if(mbuf.mode & CHDIR) {		print("directory\n");		return;	}	if(mbuf.type != 'M' && mbuf.type != '|') {		print("special file #%c\n", mbuf.type);		return;	}	nbuf = read(fd, buf, sizeof(buf)); 	if(nbuf < 0) {		print("cannot read\n");		return;	}	if(nbuf == 0) {		print("empty\n");		return;	} 	/*	 * build histogram table	 */	memset(cfreq, 0, sizeof(cfreq));	for (i = 0; language[i].name; i++)		language[i].count = 0;	for(p = (char *)buf; p < (char *)buf+nbuf;) {		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 < 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]) {		print("Free Software Foundation Copyleft\n");		return;	}	else guess = Fascii;	/*	 * lookup dictionary words	 */	if(guess == Fascii) 		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)		print("short ");	if (guess == Fascii)		print("ascii\n");	else if (guess == Feascii)		print("extended ascii\n");	else if (guess == Flatin)		print("latin ascii\n");	else if (guess == Futf && utf_count() < 4)		print_utf();	else print("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; 	for (count = i = 0; language[i].name; i++)		if (language[i].count > 0)			count++;	return count;} voidprint_utf(void){	int i, printed; 	for (i = printed = 0; language[i].name; i++)		if (language[i].count) {			if (printed)				print(" & ");			else printed = 1;			print("%s", language[i].name);		}	if(!printed)		print("UTF");	print(" text\n");} voidwordfreq(void){	int low, high, mid, c;	uchar *p; 	memset(wfreq, 0, sizeof(wfreq));	for(p = buf; p < buf+nbuf; p++) {		if(isalpha(*p)) {			high = sizeof(dict)/sizeof(dict[0]);			for(low = 0;low < high;) {				mid = (low+high)/2;				c = strncmp(dict[mid].word, (char *)p, dict[mid].length);				if(c == 0) {					wfreq[dict[mid].class]++;					break;				}				if(c < 0)					low = mid+1;				else					high = mid;			}			while (++p < buf+nbuf && isalnum(*p))				;		}	}} intlong0(void){	Fhdr f; 	seek(fd, 0, 0);		/* reposition to start of file */	if (crackhdr(fd, &f)) {		print("%s\n", f.name);		return 1;	}	switch(LENDIAN(buf)) {	case 0413:		print("demand paged pure ");		break;	case 0410:		print("pure ");		break;	case 0406:		print("mpx 68000 ");		break;	case 0407:		break;	case 0135246:		/* ehg */		print("view2d input file\n");		return 1;	default:		return 0;	}	print("unix vax executable");	if(buf[4] || buf[5] || buf[6] || buf[7])		print(" not stripped");	print("\n");	return 1;} intshort0(void){ 	switch(LENDIAN(buf) & 0xffff) {	case 070707:		print("cpio archive\n");		break; 	case 0x02f7:		print("tex dvi\n");		break;	default:		return 0;	}	return 1;} /* * initial words to classify file */struct	FILE_STRING{	char 	*key;	char	*filetype;	int	length;}	file_string[] ={	"!<arch>\n__.SYMDEF",	"archive random library",	16,	"!<arch>\n",		"archive",			8,	"070707",		"cpio archive - ascii header",	6,	"#!/bin/echo",		"cyntax object file",		11,	"#!/bin/rc",		"rc executable file",		9,	"#!/bin/sh",		"sh executable file",		9,	"%!",			"postscript",			2,	"@document(",		"imagen",			10,	"x T post",		"troff output for post",	8,	"x T Latin1",		"troff output for Latin1",	10,	"x T utf",		"troff output for UTF",		7,	"x T 202",		"troff output for 202",		7,	"x T aps",		"troff output for aps",		7,	0,0,0}; intistring(void){	int i;	struct FILE_STRING *p; 	for(p = file_string; p->key; p++) {		if(nbuf >= p->length && !strncmp((char*)buf, p->key, p->length)) {			print("%s\n", p->filetype);			return 1;		}	}	if(strncmp((char*)buf, "TYPE=", 5) == 0) {	/* td */		for(i = 5; i < nbuf; i++)			if(buf[i] == '\n')				break;		print("%.*s picture\n", i-5, buf+5);		return 1;	}	return 0;} intiscint(void){ 	if(buf[0] == 0x3a)			/* as = ANAME */	if(buf[1] == 0x11)			/* type = D_FILE */	if(buf[2] == 1)				/* sym */	if(buf[3] == '<') {			/* name of file */		print("mips .v intermediate\n");		return 1;	} 	if(buf[0] == 0x4d)			/* aslo = ANAME */	if(buf[1] == 0x01)			/* ashi = ANAME */	if(buf[2] == 0x32)			/* type = D_FILE */	if(buf[3] == 1)				/* sym */	if(buf[4] == '<') {			/* name of file */		print("68020 .2 intermediate\n");		return 1;	} 	if(buf[0] == 0x43)			/* as = ANAME */	if(buf[1] == 0x0d)			/* type */	if(buf[2] == 1)				/* sym */	if(buf[3] == '<') {			/* name of file */		print("hobbit .z intermediate\n");		return 1;	} 

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