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

static	char sccsid[] = "@(#)file.c 4.1 %G%";
/*
 * file - determine type of file
 */

#include <pagsiz.h>
#include <sys/types.h>
#include <stat.h>
#include <stdio.h>
#include <ctype.h>
#include <a.out.h>
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};
int	ifile;

main(argc, argv)
char **argv;
{
	FILE *fl;
	register char *p;
	char ap[128];
	extern char _sobuf[];

	if (argc>1 && argv[1][0]=='-' && argv[1][1]=='f') {
		if ((fl = fopen(argv[2], "r")) == NULL) {
			printf("Can't open %s\n", argv[2]);
			exit(2);
		}
		while ((p = fgets(ap, 128, 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);
	}
}

type(file)
char *file;
{
	int j,nl;
	char ch;
	struct stat mbuf;

	ifile = -1;
	if(stat(file, &mbuf) < 0) {
		printf("cannot stat\n");
		return;
	}
	switch (mbuf.st_mode & S_IFMT) {

	case S_IFCHR:
		printf("character");
		goto spcl;

	case S_IFDIR:
		printf("directory\n");
		return;

	case S_IFMPC:
		printf("char multiplexor\n");
		return;

	case S_IFMPB:
		printf("block multiplexor\n");
		return;

	case S_IFBLK:
		printf("block");

spcl:
		printf(" special (%d/%d)\n", major(mbuf.st_rdev), minor(mbuf.st_rdev));
		return;
	}

	ifile = open(file, 0);
	if(ifile < 0) {
		printf("cannot open\n");
		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:
		printf("executable");
		if(((int *)buf)[4] != 0) {
			printf(" not stripped");
			if(oldo(buf))
				printf(" (old format symbol table)");
		}
		printf("\n");
		goto out;

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

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

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

	if(strncmp(buf, "!<arch>\n__.SYMDEF", 17) == 0 ) {
		printf("archive random library\n");
		goto out;
	}
	if (strncmp(buf, "!<arch>\n", 8)==0) {
		printf("archive\n");
		goto out;
	}
	i = 0;
	if(ccom() == 0)goto notc;
	while(buf[i] == '#'){
		j = i;
		while(buf[i++] != '\n'){
			if(i - j > 255){
				printf("data\n"); 
				goto out;
			}
			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");
			goto out;
		}
		printf("data\n"); 
		goto out; 
	}
	if (mbuf.st_mode&((S_IEXEC)|(S_IEXEC>>3)|(S_IEXEC>>6)))
		printf("commands text");
	else if (troffint(buf, in))
		printf("troff intermediate output text");
	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");
			goto out;
		}
	/* 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");
					goto out;
				}
		/*.... */
	printf("\n");
out:;
}

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);
}
Commit	Line	Data
def89b26	1	static char sccsid[] = "@(#)file.c 4.1 %G%";
fd2fc6c6 BJ	2	/*
	3	* file - determine type of file
	4	*/
	5
	6	#include <pagsiz.h>
	7	#include <sys/types.h>
	8	#include <stat.h>
	9	#include <stdio.h>
	10	#include <ctype.h>
75ea79ff	11	#include <a.out.h>
fd2fc6c6 BJ	12	int in;
	13	int i = 0;
	14	char buf[BUFSIZ];
	15	char troff[] = { / new troff intermediate lang */
	16	"x","T","res","init","font","202","V0","p1",0};
	17	char *fort[] = {
	18	"function","subroutine","common","dimension","block","integer",
	19	"real","data","double",0};
	20	char *asc[] = {
	21	"chmk","mov","tst","clr","jmp",0};
	22	char *c[] = {
	23	"int","char","float","double","struct","extern",0};
	24	char *as[] = {
	25	"globl","byte","align","text","data","comm",0};
	26	int ifile;
	27
	28	main(argc, argv)
	29	char **argv;
	30	{
	31	FILE *fl;
	32	register char *p;
	33	char ap[128];
	34	extern char _sobuf[];
	35
	36	if (argc>1 && argv[1][0]=='-' && argv[1][1]=='f') {
	37	if ((fl = fopen(argv[2], "r")) == NULL) {
	38	printf("Can't open %s\n", argv[2]);
	39	exit(2);
	40	}
	41	while ((p = fgets(ap, 128, fl)) != NULL) {
	42	int l = strlen(p);
	43	if (l>0)
	44	p[l-1] = '\0';
	45	printf("%s: ", p);
	46	type(p);
	47	if (ifile>=0)
	48	close(ifile);
	49	}
	50	exit(1);
	51	}
	52	while(argc > 1) {
	53	printf("%s: ", argv[1]);
	54	type(argv[1]);
	55	fflush(stdout);
	56	argc--;
	57	argv++;
	58	if (ifile >= 0)
	59	close(ifile);
	60	}
	61	}
	62
	63	type(file)
	64	char *file;
	65	{
	66	int j,nl;
	67	char ch;
	68	struct stat mbuf;
	69
	70	ifile = -1;
	71	if(stat(file, &mbuf) < 0) {
	72	printf("cannot stat\n");
	73	return;
	74	}
	75	switch (mbuf.st_mode & S_IFMT) {
76
77	case S_IFCHR:
78	printf("character");
79	goto spcl;
80
81	case S_IFDIR:
82	printf("directory\n");
83	return;
84
85	case S_IFMPC:
86	printf("char multiplexor\n");
87	return;
88
89	case S_IFMPB:
90	printf("block multiplexor\n");
91	return;
92
93	case S_IFBLK:
94	printf("block");
95
96	spcl:
97	printf(" special (%d/%d)\n", major(mbuf.st_rdev), minor(mbuf.st_rdev));
98	return;
99	}
100
101	ifile = open(file, 0);
102	if(ifile < 0) {
103	printf("cannot open\n");
104	return;
105	}
106	in = read(ifile, buf, BUFSIZ);
107	if(in == 0){
108	printf("empty\n");
109	return;
110	}
111	switch((int )buf) {
112
113	case 0413:
114	printf("demand paged ");
115
116	case 0410:
117	printf("pure ");
118	goto exec;
119
120	case 0411:
121	printf("jfr or pdp-11 unix 411 executable\n");
122	return;
123
124	case 0407:
125	exec:
126	printf("executable");
127	if(((int *)buf)[4] != 0) {
128	printf(" not stripped");
129	if(oldo(buf))
130	printf(" (old format symbol table)");
131	}
132	printf("\n");
133	goto out;
134
135	case 0177555:
136	printf("very old archive\n");
137	goto out;
138
139	case 0177545:
140	printf("old archive\n");
141	goto out;
c083f459 BJ	142
	143	case 070707:
	144	printf("cpio data\n");
	145	goto out;
fd2fc6c6 BJ	146	}
	147
	148	if(strncmp(buf, "!<arch>\n__.SYMDEF", 17) == 0 ) {
	149	printf("archive random library\n");
	150	goto out;
	151	}
	152	if (strncmp(buf, "!<arch>\n", 8)==0) {
	153	printf("archive\n");
	154	goto out;
	155	}
	156	i = 0;
	157	if(ccom() == 0)goto notc;
	158	while(buf[i] == '#'){
	159	j = i;
	160	while(buf[i++] != '\n'){
	161	if(i - j > 255){
	162	printf("data\n");
	163	goto out;
	164	}
	165	if(i >= in)goto notc;
	166	}
	167	if(ccom() == 0)goto notc;
	168	}
	169	check:
	170	if(lookup(c) == 1){
	171	while((ch = buf[i++]) != ';' && ch != '{')if(i >= in)goto notc;
	172	printf("c program text");
	173	goto outa;
	174	}
	175	nl = 0;
	176	while(buf[i] != '('){
	177	if(buf[i] <= 0)
	178	goto notas;
	179	if(buf[i] == ';'){
	180	i++;
	181	goto check;
	182	}
	183	if(buf[i++] == '\n')
	184	if(nl++ > 6)goto notc;
	185	if(i >= in)goto notc;
	186	}
	187	while(buf[i] != ')'){
	188	if(buf[i++] == '\n')
	189	if(nl++ > 6)goto notc;
	190	if(i >= in)goto notc;
	191	}
	192	while(buf[i] != '{'){
	193	if(buf[i++] == '\n')
	194	if(nl++ > 6)goto notc;
	195	if(i >= in)goto notc;
	196	}
	197	printf("c program text");
	198	goto outa;
	199	notc:
	200	i = 0;
	201	while(buf[i] == 'c' \|\| buf[i] == '#'){
	202	while(buf[i++] != '\n')if(i >= in)goto notfort;
	203	}
	204	if(lookup(fort) == 1){
	205	printf("fortran program text");
	206	goto outa;
	207	}
	208	notfort:
	209	i=0;
210	if(ascom() == 0)goto notas;
211	j = i-1;
212	if(buf[i] == '.'){
213	i++;
214	if(lookup(as) == 1){
215	printf("assembler program text");
216	goto outa;
217	}
218	else if(buf[j] == '\n' && isalpha(buf[j+2])){
219	printf("roff, nroff, or eqn input text");
220	goto outa;
221	}
222	}
223	while(lookup(asc) == 0){
224	if(ascom() == 0)goto notas;
225	while(buf[i] != '\n' && buf[i++] != ':')
226	if(i >= in)goto notas;
227	while(buf[i] == '\n' \|\| buf[i] == ' ' \|\| buf[i] == '\t')if(i++ >= in)goto notas;
228	j = i-1;
229	if(buf[i] == '.'){
230	i++;
231	if(lookup(as) == 1){
232	printf("assembler program text");
233	goto outa;
234	}
235	else if(buf[j] == '\n' && isalpha(buf[j+2])){
236	printf("roff, nroff, or eqn input text");
237	goto outa;
238	}
239	}
240	}
241	printf("assembler program text");
242	goto outa;
243	notas:
244	for(i=0; i < in; i++)if(buf[i]&0200){
245	if (buf[0]=='\100' && buf[1]=='\357') {
246	printf("troff (CAT) output\n");
247	goto out;
248	}
249	printf("data\n");
250	goto out;
251	}
252	if (mbuf.st_mode&((S_IEXEC)\|(S_IEXEC>>3)\|(S_IEXEC>>6)))
253	printf("commands text");
254	else if (troffint(buf, in))
255	printf("troff intermediate output text");
256	else if (english(buf, in))
257	printf("English text");
258	else
259	printf("ascii text");
260	outa:
261	while(i < in)
262	if((buf[i++]&0377) > 127){
263	printf(" with garbage\n");
264	goto out;
265	}
266	/* if next few lines in then read whole file looking for nulls ...
267	while((in = read(ifile,buf,BUFSIZ)) > 0)
268	for(i = 0; i < in; i++)
269	if((buf[i]&0377) > 127){
270	printf(" with garbage\n");
271	goto out;
272	}
273	/.... /
274	printf("\n");
275	out:;
276	}
277
278	oldo(cp)
279	char *cp;
280	{
281	struct exec ex;
282	struct stat stb;
283
284	ex = (struct exec )cp;
285	if (fstat(ifile, &stb) < 0)
286	return(0);
287	if (N_STROFF(ex)+sizeof(off_t) > stb.st_size)
288	return (1);
289	return (0);
290	}
291
292
293
294	troffint(bp, n)
295	char *bp;
296	int n;
297	{
298	int k;
299
300	i = 0;
301	for (k = 0; k < 6; k++) {
302	if (lookup(troff) == 0)
303	return(0);
304	if (lookup(troff) == 0)
305	return(0);
306	while (i < n && buf[i] != '\n')
307	i++;
308	if (i++ >= n)
309	return(0);
310	}
311	return(1);
312	}
313	lookup(tab)
314	char *tab[];
315	{
316	char r;
317	int k,j,l;
318	while(buf[i] == ' ' \|\| buf[i] == '\t' \|\| buf[i] == '\n')i++;
319	for(j=0; tab[j] != 0; j++){
320	l=0;
321	for(k=i; ((r=tab[j][l++]) == buf[k] && r != '\0');k++);
322	if(r == '\0')
323	if(buf[k] == ' ' \|\| buf[k] == '\n' \|\| buf[k] == '\t'
324	\|\| buf[k] == '{' \|\| buf[k] == '/'){
325	i=k;
326	return(1);
327	}
328	}
329	return(0);
330	}
331	ccom(){
332	char cc;
333	while((cc = buf[i]) == ' ' \|\| cc == '\t' \|\| cc == '\n')if(i++ >= in)return(0);
334	if(buf[i] == '/' && buf[i+1] == '*'){
335	i += 2;
336	while(buf[i] != '*' \|\| buf[i+1] != '/'){
337	if(buf[i] == '\\')i += 2;
338	else i++;
339	if(i >= in)return(0);
340	}
341	if((i += 2) >= in)return(0);
342	}
343	if(buf[i] == '\n')if(ccom() == 0)return(0);
344	return(1);
345	}
346	ascom(){
347	while(buf[i] == '/'){
348	i++;
349	while(buf[i++] != '\n')if(i >= in)return(0);
350	while(buf[i] == '\n')if(i++ >= in)return(0);
351	}
352	return(1);
353	}
354
355	english (bp, n)
356	char *bp;
357	{
358	# define NASC 128
359	int ct[NASC], j, vow, freq, rare;
360	int badpun = 0, punct = 0;
361	if (n<50) return(0); /* no point in statistics on squibs */
362	for(j=0; j<NASC; j++)
363	ct[j]=0;
364	for(j=0; j<n; j++)
365	{
366	if (bp[j]<NASC)
367	ct[bp[j]\|040]++;
368	switch (bp[j])
369	{
370	case '.':
371	case ',':
372	case ')':
373	case '%':
374	case ';':
375	case ':':
376	case '?':
377	punct++;
378	if ( j < n-1 &&
379	bp[j+1] != ' ' &&
380	bp[j+1] != '\n')
381	badpun++;
382	}
383	}
384	if (badpun*5 > punct)
385	return(0);
386	vow = ct['a'] + ct['e'] + ct['i'] + ct['o'] + ct['u'];
387	freq = ct['e'] + ct['t'] + ct['a'] + ct['i'] + ct['o'] + ct['n'];
388	rare = ct['v'] + ct['j'] + ct['k'] + ct['q'] + ct['x'] + ct['z'];
389	if (2*ct[';'] > ct['e']) return(0);
390	if ( (ct['>']+ct['<']+ct['/'])>ct['e']) return(0); /* shell file test */
391	return (vow5 >= n-ct[' '] && freq >= 10rare);
392	}