[unix-history] / usr / src / usr.bin / file / file.c

#ifndef lint
static	char sccsid[] = "@(#)file.c	4.10 (Berkeley) %G%";
#endif
/*
 * file - determine type of file
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#include <ctype.h>
#include <a.out.h>
int	errno;
int	sys_nerr;
char	*sys_errlist[];
int in;
int i  = 0;
char buf[BUFSIZ];
char *troff[] = {	/* new troff intermediate lang */
	"x","T","res","init","font","202","V0","p1",0};
char *fort[] = {
	"function","subroutine","common","dimension","block","integer",
	"real","data","double",0};
char *asc[] = {
	"chmk","mov","tst","clr","jmp",0};
char *c[] = {
	"int","char","float","double","struct","extern",0};
char *as[] = {
	"globl","byte","align","text","data","comm",0};
char *sh[] = {
	"fi", "elif", "esac", "done", "export",
	"readonly", "trap", "PATH", "HOME", 0 };
char *csh[] = {
	"alias", "breaksw", "endsw", "foreach", "limit",  "onintr",
	"repeat", "setenv", "source", "path", "home", 0 };
int	ifile;

main(argc, argv)
char **argv;
{
	FILE *fl;
	register char *p;
	char ap[MAXPATHLEN + 1];
	extern char _sobuf[];

	if (argc < 2) {
		fprintf(stderr, "usage: %s file ...\n", argv[0]);
		exit(3);
	}
		
	if (argc>1 && argv[1][0]=='-' && argv[1][1]=='f') {
		if ((fl = fopen(argv[2], "r")) == NULL) {
			perror(argv[2]);
			exit(2);
		}
		while ((p = fgets(ap, sizeof ap, fl)) != NULL) {
			int l = strlen(p);
			if (l>0)
				p[l-1] = '\0';
			printf("%s:	", p);
			type(p);
			if (ifile>=0)
				close(ifile);
		}
		exit(1);
	}
	while(argc > 1) {
		printf("%s:	", argv[1]);
		type(argv[1]);
		fflush(stdout);
		argc--;
		argv++;
		if (ifile >= 0)
			close(ifile);
	}
	exit(0);
}

type(file)
char *file;
{
	int j,nl;
	char ch;
	struct stat mbuf;
	char slink[MAXPATHLEN + 1];

	ifile = -1;
	if (lstat(file, &mbuf) < 0) {
		printf("%s\n",
		(unsigned)errno < sys_nerr? sys_errlist[errno]: "Cannot stat");
		return;
	}
	switch (mbuf.st_mode & S_IFMT) {

	case S_IFLNK:
		printf("symbolic link");
		j = readlink(file, slink, sizeof slink - 1);
		if (j >= 0) {
			slink[j] = '\0';
			printf(" to %s", slink);
		}
		printf("\n");
		return;

	case S_IFDIR:
		if (mbuf.st_mode & S_ISVTX)
			printf("append-only ");
		printf("directory\n");
		return;

	case S_IFCHR:
	case S_IFBLK:
		printf("%s special (%d/%d)\n",
			mbuf.st_mode&S_IFMT == S_IFCHR ? "character" : "block",
			major(mbuf.st_rdev), minor(mbuf.st_rdev));
		return;

	case S_IFSOCK:
		printf("socket\n");
		return;
	}

	ifile = open(file, 0);
	if(ifile < 0) {
		printf("%s\n",
		(unsigned)errno < sys_nerr? sys_errlist[errno]: "Cannot read");
		return;
	}
	in = read(ifile, buf, BUFSIZ);
	if(in == 0){
		printf("empty\n");
		return;
	}
	switch(*(int *)buf) {

	case 0413:
		printf("demand paged ");

	case 0410:
		printf("pure ");
		goto exec;

	case 0411:
		printf("jfr or pdp-11 unix 411 executable\n");
		return;

	case 0407:
exec:
		if (mbuf.st_mode & S_ISUID)
			printf("set-uid ");
		if (mbuf.st_mode & S_ISGID)
			printf("set-gid ");
		if (mbuf.st_mode & S_ISVTX)
			printf("sticky ");
		printf("executable");
		if(((int *)buf)[4] != 0) {
			printf(" not stripped");
			if(oldo(buf))
				printf(" (old format symbol table)");
		}
		printf("\n");
		return;

	case 0177555:
		printf("very old archive\n");
		return;

	case 0177545:
		printf("old archive\n");
		return;

	case 070707:
		printf("cpio data\n");
		return;
	}

	if (buf[0] == '#' && buf[1] == '!' && shellscript(buf+2, &mbuf))
		return;
	if(strncmp(buf, "!<arch>\n__.SYMDEF", 17) == 0 ) {
		printf("archive random library\n");
		return;
	}
	if (strncmp(buf, "!<arch>\n", 8)==0) {
		printf("archive\n");
		return;
	}
	if (mbuf.st_size % 512 == 0) {	/* it may be a PRESS file */
		lseek(ifile, -512L, 2);	/* last block */
		if (read(ifile, buf, BUFSIZ) > 0 && *(short *)buf == 12138) {
			printf("PRESS file\n");
			return;
		}
	}
	i = 0;
	if(ccom() == 0)goto notc;
	while(buf[i] == '#'){
		j = i;
		while(buf[i++] != '\n'){
			if(i - j > 255){
				printf("data\n"); 
				return;
			}
			if(i >= in)goto notc;
		}
		if(ccom() == 0)goto notc;
	}
check:
	if(lookup(c) == 1){
		while((ch = buf[i++]) != ';' && ch != '{')if(i >= in)goto notc;
		printf("c program text");
		goto outa;
	}
	nl = 0;
	while(buf[i] != '('){
		if(buf[i] <= 0)
			goto notas;
		if(buf[i] == ';'){
			i++; 
			goto check; 
		}
		if(buf[i++] == '\n')
			if(nl++ > 6)goto notc;
		if(i >= in)goto notc;
	}
	while(buf[i] != ')'){
		if(buf[i++] == '\n')
			if(nl++ > 6)goto notc;
		if(i >= in)goto notc;
	}
	while(buf[i] != '{'){
		if(buf[i++] == '\n')
			if(nl++ > 6)goto notc;
		if(i >= in)goto notc;
	}
	printf("c program text");
	goto outa;
notc:
	i = 0;
	while(buf[i] == 'c' || buf[i] == '#'){
		while(buf[i++] != '\n')if(i >= in)goto notfort;
	}
	if(lookup(fort) == 1){
		printf("fortran program text");
		goto outa;
	}
notfort:
	i=0;
	if(ascom() == 0)goto notas;
	j = i-1;
	if(buf[i] == '.'){
		i++;
		if(lookup(as) == 1){
			printf("assembler program text"); 
			goto outa;
		}
		else if(buf[j] == '\n' && isalpha(buf[j+2])){
			printf("roff, nroff, or eqn input text");
			goto outa;
		}
	}
	while(lookup(asc) == 0){
		if(ascom() == 0)goto notas;
		while(buf[i] != '\n' && buf[i++] != ':')
			if(i >= in)goto notas;
		while(buf[i] == '\n' || buf[i] == ' ' || buf[i] == '\t')if(i++ >= in)goto notas;
		j = i-1;
		if(buf[i] == '.'){
			i++;
			if(lookup(as) == 1){
				printf("assembler program text"); 
				goto outa; 
			}
			else if(buf[j] == '\n' && isalpha(buf[j+2])){
				printf("roff, nroff, or eqn input text");
				goto outa;
			}
		}
	}
	printf("assembler program text");
	goto outa;
notas:
	for(i=0; i < in; i++)if(buf[i]&0200){
		if (buf[0]=='\100' && buf[1]=='\357')
			printf("troff (CAT) output\n");
		else
			printf("data\n"); 
		return;
	}
	if (mbuf.st_mode&((S_IEXEC)|(S_IEXEC>>3)|(S_IEXEC>>6))) {
		if (mbuf.st_mode & S_ISUID)
			printf("set-uid ");
		if (mbuf.st_mode & S_ISGID)
			printf("set-gid ");
		if (mbuf.st_mode & S_ISVTX)
			printf("sticky ");
		if (shell(buf, in, sh))
			printf("shell script");
		else if (shell(buf, in, csh))
			printf("c-shell script");
		else
			printf("commands text");
	} else if (troffint(buf, in))
		printf("troff intermediate output text");
	else if (shell(buf, in, sh))
		printf("shell commands");
	else if (shell(buf, in, csh))
		printf("c-shell commands");
	else if (english(buf, in))
		printf("English text");
	else
		printf("ascii text");
outa:
	while(i < in)
		if((buf[i++]&0377) > 127){
			printf(" with garbage\n");
			return;
		}
	/* if next few lines in then read whole file looking for nulls ...
		while((in = read(ifile,buf,BUFSIZ)) > 0)
			for(i = 0; i < in; i++)
				if((buf[i]&0377) > 127){
					printf(" with garbage\n");
					return;
				}
		/*.... */
	printf("\n");
}

oldo(cp)
char *cp;
{
	struct exec ex;
	struct stat stb;

	ex = *(struct exec *)cp;
	if (fstat(ifile, &stb) < 0)
		return(0);
	if (N_STROFF(ex)+sizeof(off_t) > stb.st_size)
		return (1);
	return (0);
}


troffint(bp, n)
char *bp;
int n;
{
	int k;

	i = 0;
	for (k = 0; k < 6; k++) {
		if (lookup(troff) == 0)
			return(0);
		if (lookup(troff) == 0)
			return(0);
		while (i < n && buf[i] != '\n')
			i++;
		if (i++ >= n)
			return(0);
	}
	return(1);
}
lookup(tab)
char *tab[];
{
	char r;
	int k,j,l;
	while(buf[i] == ' ' || buf[i] == '\t' || buf[i] == '\n')i++;
	for(j=0; tab[j] != 0; j++){
		l=0;
		for(k=i; ((r=tab[j][l++]) == buf[k] && r != '\0');k++);
		if(r == '\0')
			if(buf[k] == ' ' || buf[k] == '\n' || buf[k] == '\t'
			    || buf[k] == '{' || buf[k] == '/'){
				i=k;
				return(1);
			}
	}
	return(0);
}
ccom(){
	char cc;
	while((cc = buf[i]) == ' ' || cc == '\t' || cc == '\n')if(i++ >= in)return(0);
	if(buf[i] == '/' && buf[i+1] == '*'){
		i += 2;
		while(buf[i] != '*' || buf[i+1] != '/'){
			if(buf[i] == '\\')i += 2;
			else i++;
			if(i >= in)return(0);
		}
		if((i += 2) >= in)return(0);
	}
	if(buf[i] == '\n')if(ccom() == 0)return(0);
	return(1);
}
ascom(){
	while(buf[i] == '/'){
		i++;
		while(buf[i++] != '\n')if(i >= in)return(0);
		while(buf[i] == '\n')if(i++ >= in)return(0);
	}
	return(1);
}

english (bp, n)
char *bp;
{
# define NASC 128
	int ct[NASC], j, vow, freq, rare;
	int badpun = 0, punct = 0;
	if (n<50) return(0); /* no point in statistics on squibs */
	for(j=0; j<NASC; j++)
		ct[j]=0;
	for(j=0; j<n; j++)
	{
		if (bp[j]<NASC)
			ct[bp[j]|040]++;
		switch (bp[j])
		{
		case '.': 
		case ',': 
		case ')': 
		case '%':
		case ';': 
		case ':': 
		case '?':
			punct++;
			if ( j < n-1 &&
			    bp[j+1] != ' ' &&
			    bp[j+1] != '\n')
				badpun++;
		}
	}
	if (badpun*5 > punct)
		return(0);
	vow = ct['a'] + ct['e'] + ct['i'] + ct['o'] + ct['u'];
	freq = ct['e'] + ct['t'] + ct['a'] + ct['i'] + ct['o'] + ct['n'];
	rare = ct['v'] + ct['j'] + ct['k'] + ct['q'] + ct['x'] + ct['z'];
	if (2*ct[';'] > ct['e']) return(0);
	if ( (ct['>']+ct['<']+ct['/'])>ct['e']) return(0); /* shell file test */
	return (vow*5 >= n-ct[' '] && freq >= 10*rare);
}

shellscript(buf, sb)
	char buf[];
	struct stat *sb;
{
	register char *tp;
	char *cp, *xp, *index();

	cp = index(buf, '\n');
	if (cp == 0 || cp - buf > in)
		return (0);
	for (tp = buf; tp != cp && isspace(*tp); tp++)
		if (!isascii(*tp))
			return (0);
	for (xp = tp; tp != cp && !isspace(*tp); tp++)
		if (!isascii(*tp))
			return (0);
	if (tp == xp)
		return (0);
	if (sb->st_mode & S_ISUID)
		printf("set-uid ");
	if (sb->st_mode & S_ISGID)
		printf("set-gid ");
	if (strncmp(xp, "/bin/sh", tp-xp) == 0)
		xp = "shell";
	else if (strncmp(xp, "/bin/csh", tp-xp) == 0)
		xp = "c-shell";
	else
		*tp = '\0';
	printf("executable %s script\n", xp);
	return (1);
}

shell(bp, n, tab)
	char *bp;
	int n;
	char *tab[];
{

	i = 0;
	do {
		if (buf[i] == '#' || buf[i] == ':')
			while (i < n && buf[i] != '\n')
				i++;
		if (++i >= n)
			break;
		if (lookup(tab) == 1)
			return (1);
	} while (i < n);
	return (0);
}
Commit	Line	Data
34aa0635	1	#ifndef lint
d1e27000	2	static char sccsid[] = "@(#)file.c 4.10 (Berkeley) %G%";
34aa0635	3	#endif
fd2fc6c6 BJ	4	/*
	5	* file - determine type of file
	6	*/
	7
5f9c2dd3	8	#include <sys/param.h>
56140c8b	9	#include <sys/stat.h>
fd2fc6c6 BJ	10	#include <stdio.h>
fd2fc6c6 BJ	11	#include <ctype.h>
75ea79ff	12	#include <a.out.h>
136b085b	13	int errno;
5f9c2dd3	14	int sys_nerr;
136b085b	15	char *sys_errlist[];
fd2fc6c6 BJ	16	int in;
	17	int i = 0;
	18	char buf[BUFSIZ];
	19	char troff[] = { / new troff intermediate lang */
	20	"x","T","res","init","font","202","V0","p1",0};
	21	char *fort[] = {
	22	"function","subroutine","common","dimension","block","integer",
	23	"real","data","double",0};
	24	char *asc[] = {
	25	"chmk","mov","tst","clr","jmp",0};
	26	char *c[] = {
	27	"int","char","float","double","struct","extern",0};
	28	char *as[] = {
	29	"globl","byte","align","text","data","comm",0};
d1e27000 SL	30	char *sh[] = {
	31	"fi", "elif", "esac", "done", "export",
	32	"readonly", "trap", "PATH", "HOME", 0 };
	33	char *csh[] = {
	34	"alias", "breaksw", "endsw", "foreach", "limit", "onintr",
	35	"repeat", "setenv", "source", "path", "home", 0 };
fd2fc6c6 BJ	36	int ifile;
	37
	38	main(argc, argv)
	39	char **argv;
	40	{
	41	FILE *fl;
	42	register char *p;
5f9c2dd3	43	char ap[MAXPATHLEN + 1];
fd2fc6c6 BJ	44	extern char _sobuf[];
fd2fc6c6 BJ	45
5f9c2dd3 S	46	if (argc < 2) {
	47	fprintf(stderr, "usage: %s file ...\n", argv[0]);
	48	exit(3);
	49	}
	50
fd2fc6c6 BJ	51	if (argc>1 && argv[1][0]=='-' && argv[1][1]=='f') {
fd2fc6c6 BJ	52	if ((fl = fopen(argv[2], "r")) == NULL) {
136b085b	53	perror(argv[2]);
fd2fc6c6 BJ	54	exit(2);
fd2fc6c6 BJ	55	}
5f9c2dd3	56	while ((p = fgets(ap, sizeof ap, fl)) != NULL) {
fd2fc6c6 BJ	57	int l = strlen(p);
	58	if (l>0)
	59	p[l-1] = '\0';
	60	printf("%s: ", p);
	61	type(p);
	62	if (ifile>=0)
	63	close(ifile);
	64	}
	65	exit(1);
	66	}
	67	while(argc > 1) {
	68	printf("%s: ", argv[1]);
	69	type(argv[1]);
	70	fflush(stdout);
	71	argc--;
	72	argv++;
	73	if (ifile >= 0)
	74	close(ifile);
	75	}
5f9c2dd3	76	exit(0);
fd2fc6c6 BJ	77	}
	78
	79	type(file)
	80	char *file;
	81	{
	82	int j,nl;
	83	char ch;
	84	struct stat mbuf;
5f9c2dd3	85	char slink[MAXPATHLEN + 1];
fd2fc6c6 BJ	86
fd2fc6c6 BJ	87	ifile = -1;
2db3d63d	88	if (lstat(file, &mbuf) < 0) {
5f9c2dd3 S	89	printf("%s\n",
5f9c2dd3 S	90	(unsigned)errno < sys_nerr? sys_errlist[errno]: "Cannot stat");
fd2fc6c6 BJ	91	return;
	92	}
	93	switch (mbuf.st_mode & S_IFMT) {
	94
2db3d63d	95	case S_IFLNK:
5f9c2dd3 S	96	printf("symbolic link");
	97	j = readlink(file, slink, sizeof slink - 1);
	98	if (j >= 0) {
	99	slink[j] = '\0';
	100	printf(" to %s", slink);
	101	}
	102	printf("\n");
fd2fc6c6 BJ	103	return;
fd2fc6c6 BJ	104
2db3d63d	105	case S_IFDIR:
5f9c2dd3 S	106	if (mbuf.st_mode & S_ISVTX)
5f9c2dd3 S	107	printf("append-only ");
2db3d63d	108	printf("directory\n");
fd2fc6c6 BJ	109	return;
fd2fc6c6 BJ	110
5f9c2dd3	111	case S_IFCHR:
fd2fc6c6	112	case S_IFBLK:
5f9c2dd3 S	113	printf("%s special (%d/%d)\n",
	114	mbuf.st_mode&S_IFMT == S_IFCHR ? "character" : "block",
	115	major(mbuf.st_rdev), minor(mbuf.st_rdev));
	116	return;
fd2fc6c6	117
5f9c2dd3 S	118	case S_IFSOCK:
5f9c2dd3 S	119	printf("socket\n");
fd2fc6c6 BJ	120	return;
	121	}
	122
	123	ifile = open(file, 0);
	124	if(ifile < 0) {
5f9c2dd3 S	125	printf("%s\n",
5f9c2dd3 S	126	(unsigned)errno < sys_nerr? sys_errlist[errno]: "Cannot read");
fd2fc6c6 BJ	127	return;
	128	}
	129	in = read(ifile, buf, BUFSIZ);
	130	if(in == 0){
	131	printf("empty\n");
	132	return;
	133	}
	134	switch((int )buf) {
	135
	136	case 0413:
	137	printf("demand paged ");
	138
	139	case 0410:
	140	printf("pure ");
	141	goto exec;
	142
	143	case 0411:
	144	printf("jfr or pdp-11 unix 411 executable\n");
	145	return;
	146
	147	case 0407:
	148	exec:
5f9c2dd3 S	149	if (mbuf.st_mode & S_ISUID)
	150	printf("set-uid ");
	151	if (mbuf.st_mode & S_ISGID)
	152	printf("set-gid ");
	153	if (mbuf.st_mode & S_ISVTX)
	154	printf("sticky ");
fd2fc6c6 BJ	155	printf("executable");
	156	if(((int *)buf)[4] != 0) {
	157	printf(" not stripped");
	158	if(oldo(buf))
	159	printf(" (old format symbol table)");
	160	}
	161	printf("\n");
d1e27000	162	return;
fd2fc6c6 BJ	163
	164	case 0177555:
	165	printf("very old archive\n");
d1e27000	166	return;
fd2fc6c6 BJ	167
	168	case 0177545:
	169	printf("old archive\n");
d1e27000	170	return;
c083f459 BJ	171
	172	case 070707:
	173	printf("cpio data\n");
d1e27000	174	return;
fd2fc6c6 BJ	175	}
fd2fc6c6 BJ	176
d1e27000 SL	177	if (buf[0] == '#' && buf[1] == '!' && shellscript(buf+2, &mbuf))
d1e27000 SL	178	return;
fd2fc6c6 BJ	179	if(strncmp(buf, "!<arch>\n__.SYMDEF", 17) == 0 ) {
fd2fc6c6 BJ	180	printf("archive random library\n");
d1e27000	181	return;
fd2fc6c6 BJ	182	}
	183	if (strncmp(buf, "!<arch>\n", 8)==0) {
	184	printf("archive\n");
d1e27000	185	return;
fd2fc6c6	186	}
47aeb93c BJ	187	if (mbuf.st_size % 512 == 0) { /* it may be a PRESS file */
47aeb93c BJ	188	lseek(ifile, -512L, 2); /* last block */
d1e27000	189	if (read(ifile, buf, BUFSIZ) > 0 && (short )buf == 12138) {
47aeb93c	190	printf("PRESS file\n");
d1e27000	191	return;
47aeb93c BJ	192	}
47aeb93c BJ	193	}
fd2fc6c6 BJ	194	i = 0;
	195	if(ccom() == 0)goto notc;
	196	while(buf[i] == '#'){
	197	j = i;
	198	while(buf[i++] != '\n'){
	199	if(i - j > 255){
	200	printf("data\n");
d1e27000	201	return;
fd2fc6c6 BJ	202	}
	203	if(i >= in)goto notc;
	204	}
	205	if(ccom() == 0)goto notc;
	206	}
	207	check:
	208	if(lookup(c) == 1){
	209	while((ch = buf[i++]) != ';' && ch != '{')if(i >= in)goto notc;
	210	printf("c program text");
	211	goto outa;
	212	}
	213	nl = 0;
	214	while(buf[i] != '('){
	215	if(buf[i] <= 0)
	216	goto notas;
	217	if(buf[i] == ';'){
	218	i++;
	219	goto check;
	220	}
	221	if(buf[i++] == '\n')
	222	if(nl++ > 6)goto notc;
	223	if(i >= in)goto notc;
	224	}
	225	while(buf[i] != ')'){
	226	if(buf[i++] == '\n')
	227	if(nl++ > 6)goto notc;
	228	if(i >= in)goto notc;
	229	}
	230	while(buf[i] != '{'){
	231	if(buf[i++] == '\n')
	232	if(nl++ > 6)goto notc;
	233	if(i >= in)goto notc;
	234	}
	235	printf("c program text");
	236	goto outa;
	237	notc:
	238	i = 0;
	239	while(buf[i] == 'c' \|\| buf[i] == '#'){
	240	while(buf[i++] != '\n')if(i >= in)goto notfort;
	241	}
	242	if(lookup(fort) == 1){
	243	printf("fortran program text");
	244	goto outa;
	245	}
	246	notfort:
	247	i=0;
	248	if(ascom() == 0)goto notas;
	249	j = i-1;
	250	if(buf[i] == '.'){
	251	i++;
	252	if(lookup(as) == 1){
	253	printf("assembler program text");
	254	goto outa;
	255	}
	256	else if(buf[j] == '\n' && isalpha(buf[j+2])){
	257	printf("roff, nroff, or eqn input text");
	258	goto outa;
	259	}
	260	}
	261	while(lookup(asc) == 0){
	262	if(ascom() == 0)goto notas;
	263	while(buf[i] != '\n' && buf[i++] != ':')
	264	if(i >= in)goto notas;
	265	while(buf[i] == '\n' \|\| buf[i] == ' ' \|\| buf[i] == '\t')if(i++ >= in)goto notas;
266	j = i-1;
267	if(buf[i] == '.'){
268	i++;
269	if(lookup(as) == 1){
270	printf("assembler program text");
271	goto outa;
272	}
273	else if(buf[j] == '\n' && isalpha(buf[j+2])){
274	printf("roff, nroff, or eqn input text");
275	goto outa;
276	}
277	}
278	}
279	printf("assembler program text");
280	goto outa;
281	notas:
282	for(i=0; i < in; i++)if(buf[i]&0200){
d1e27000	283	if (buf[0]=='\100' && buf[1]=='\357')
fd2fc6c6	284	printf("troff (CAT) output\n");
d1e27000 SL	285	else
	286	printf("data\n");
	287	return;
fd2fc6c6	288	}
5f9c2dd3 S	289	if (mbuf.st_mode&((S_IEXEC)\|(S_IEXEC>>3)\|(S_IEXEC>>6))) {
	290	if (mbuf.st_mode & S_ISUID)
	291	printf("set-uid ");
	292	if (mbuf.st_mode & S_ISGID)
	293	printf("set-gid ");
	294	if (mbuf.st_mode & S_ISVTX)
	295	printf("sticky ");
d1e27000 SL	296	if (shell(buf, in, sh))
	297	printf("shell script");
	298	else if (shell(buf, in, csh))
	299	printf("c-shell script");
	300	else
	301	printf("commands text");
5f9c2dd3	302	} else if (troffint(buf, in))
fd2fc6c6	303	printf("troff intermediate output text");
d1e27000 SL	304	else if (shell(buf, in, sh))
	305	printf("shell commands");
	306	else if (shell(buf, in, csh))
	307	printf("c-shell commands");
fd2fc6c6 BJ	308	else if (english(buf, in))
	309	printf("English text");
	310	else
	311	printf("ascii text");
	312	outa:
	313	while(i < in)
	314	if((buf[i++]&0377) > 127){
	315	printf(" with garbage\n");
d1e27000	316	return;
fd2fc6c6 BJ	317	}
	318	/* if next few lines in then read whole file looking for nulls ...
	319	while((in = read(ifile,buf,BUFSIZ)) > 0)
	320	for(i = 0; i < in; i++)
	321	if((buf[i]&0377) > 127){
	322	printf(" with garbage\n");
d1e27000	323	return;
fd2fc6c6 BJ	324	}
	325	/.... /
	326	printf("\n");
fd2fc6c6 BJ	327	}
	328
	329	oldo(cp)
	330	char *cp;
	331	{
	332	struct exec ex;
	333	struct stat stb;
	334
	335	ex = (struct exec )cp;
	336	if (fstat(ifile, &stb) < 0)
	337	return(0);
	338	if (N_STROFF(ex)+sizeof(off_t) > stb.st_size)
	339	return (1);
	340	return (0);
	341	}
	342
	343
	344
	345	troffint(bp, n)
	346	char *bp;
	347	int n;
	348	{
	349	int k;
	350
	351	i = 0;
	352	for (k = 0; k < 6; k++) {
	353	if (lookup(troff) == 0)
	354	return(0);
	355	if (lookup(troff) == 0)
	356	return(0);
	357	while (i < n && buf[i] != '\n')
	358	i++;
	359	if (i++ >= n)
	360	return(0);
	361	}
	362	return(1);
	363	}
	364	lookup(tab)
	365	char *tab[];
	366	{
	367	char r;
	368	int k,j,l;
	369	while(buf[i] == ' ' \|\| buf[i] == '\t' \|\| buf[i] == '\n')i++;
	370	for(j=0; tab[j] != 0; j++){
	371	l=0;
	372	for(k=i; ((r=tab[j][l++]) == buf[k] && r != '\0');k++);
	373	if(r == '\0')
	374	if(buf[k] == ' ' \|\| buf[k] == '\n' \|\| buf[k] == '\t'
	375	\|\| buf[k] == '{' \|\| buf[k] == '/'){
	376	i=k;
	377	return(1);
	378	}
	379	}
	380	return(0);
	381	}
	382	ccom(){
	383	char cc;
	384	while((cc = buf[i]) == ' ' \|\| cc == '\t' \|\| cc == '\n')if(i++ >= in)return(0);
	385	if(buf[i] == '/' && buf[i+1] == '*'){
	386	i += 2;
	387	while(buf[i] != '*' \|\| buf[i+1] != '/'){
	388	if(buf[i] == '\\')i += 2;
	389	else i++;
	390	if(i >= in)return(0);
391	}
392	if((i += 2) >= in)return(0);
393	}
394	if(buf[i] == '\n')if(ccom() == 0)return(0);
395	return(1);
396	}
397	ascom(){
398	while(buf[i] == '/'){
399	i++;
400	while(buf[i++] != '\n')if(i >= in)return(0);
401	while(buf[i] == '\n')if(i++ >= in)return(0);
402	}
403	return(1);
404	}
405
406	english (bp, n)
407	char *bp;
408	{
409	# define NASC 128
410	int ct[NASC], j, vow, freq, rare;
411	int badpun = 0, punct = 0;
412	if (n<50) return(0); /* no point in statistics on squibs */
413	for(j=0; j<NASC; j++)
414	ct[j]=0;
415	for(j=0; j<n; j++)
416	{
417	if (bp[j]<NASC)
418	ct[bp[j]\|040]++;
419	switch (bp[j])
420	{
421	case '.':
422	case ',':
423	case ')':
424	case '%':
425	case ';':
426	case ':':
427	case '?':
428	punct++;
429	if ( j < n-1 &&
430	bp[j+1] != ' ' &&
431	bp[j+1] != '\n')
432	badpun++;
433	}
434	}
435	if (badpun*5 > punct)
436	return(0);
437	vow = ct['a'] + ct['e'] + ct['i'] + ct['o'] + ct['u'];
438	freq = ct['e'] + ct['t'] + ct['a'] + ct['i'] + ct['o'] + ct['n'];
439	rare = ct['v'] + ct['j'] + ct['k'] + ct['q'] + ct['x'] + ct['z'];
440	if (2*ct[';'] > ct['e']) return(0);
441	if ( (ct['>']+ct['<']+ct['/'])>ct['e']) return(0); /* shell file test */
442	return (vow5 >= n-ct[' '] && freq >= 10rare);
443	}
d1e27000 SL	444
	445	shellscript(buf, sb)
	446	char buf[];
	447	struct stat *sb;
	448	{
	449	register char *tp;
	450	char cp, xp, *index();
	451
	452	cp = index(buf, '\n');
	453	if (cp == 0 \|\| cp - buf > in)
	454	return (0);
	455	for (tp = buf; tp != cp && isspace(*tp); tp++)
	456	if (!isascii(*tp))
	457	return (0);
	458	for (xp = tp; tp != cp && !isspace(*tp); tp++)
	459	if (!isascii(*tp))
	460	return (0);
	461	if (tp == xp)
	462	return (0);
	463	if (sb->st_mode & S_ISUID)
	464	printf("set-uid ");
	465	if (sb->st_mode & S_ISGID)
	466	printf("set-gid ");
	467	if (strncmp(xp, "/bin/sh", tp-xp) == 0)
	468	xp = "shell";
	469	else if (strncmp(xp, "/bin/csh", tp-xp) == 0)
	470	xp = "c-shell";
	471	else
	472	*tp = '\0';
	473	printf("executable %s script\n", xp);
	474	return (1);
	475	}
	476
	477	shell(bp, n, tab)
	478	char *bp;
	479	int n;
	480	char *tab[];
	481	{
	482
	483	i = 0;
	484	do {
	485	if (buf[i] == '#' \|\| buf[i] == ':')
	486	while (i < n && buf[i] != '\n')
	487	i++;
	488	if (++i >= n)
	489	break;
	490	if (lookup(tab) == 1)
	491	return (1);
	492	} while (i < n);
	493	return (0);
	494	}