[unix-history] / usr / src / usr.bin / grep / old.bin.grep / old.bin.grep.c

/*	old.bin.grep.c	4.1	82/05/07	*/

/*
 * grep -- print lines matching (or not matching) a pattern
 *
 *	status returns:
 *		0 - ok, and some matches
 *		1 - ok, but no matches
 *		2 - some error
 */

#include <stdio.h>
#include <ctype.h>

#define	CBRA	1
#define	CCHR	2
#define	CDOT	4
#define	CCL	6
#define	NCCL	8
#define	CDOL	10
#define	CEOF	11
#define	CKET	12
#define	CBACK	18

#define	STAR	01

#define	LBSIZE	BUFSIZ
#define	ESIZE	256
#define	NBRA	9

char	expbuf[ESIZE];
long	lnum;
char	linebuf[LBSIZE+1];
char	ybuf[ESIZE];
int	bflag;
int	lflag;
int	nflag;
int	cflag;
int	vflag;
int	nfile;
int	hflag	= 1;
int	sflag;
int	yflag;
int	circf;
int	blkno;
long	tln;
int	nsucc;
char	*braslist[NBRA];
char	*braelist[NBRA];
char	bittab[] = {
	1,
	2,
	4,
	8,
	16,
	32,
	64,
	128
};

main(argc, argv)
char **argv;
{
	extern char _sobuf[];
	setbuf(stdout, _sobuf);
	while (--argc > 0 && (++argv)[0][0]=='-')
		switch (argv[0][1]) {

		case 'y':
			yflag++;
			continue;

		case 'h':
			hflag = 0;
			continue;

		case 's':
			sflag++;
			continue;

		case 'v':
			vflag++;
			continue;

		case 'b':
			bflag++;
			continue;

		case 'l':
			lflag++;
			continue;

		case 'c':
			cflag++;
			continue;

		case 'n':
			nflag++;
			continue;

		case 'e':
			--argc;
			++argv;
			goto out;

		default:
			errexit("grep: unknown flag\n", (char *)NULL);
			continue;
		}
out:
	if (argc<=0)
		exit(2);
	if (yflag) {
		register char *p, *s;
		for (s = ybuf, p = *argv; *p; ) {
			if (*p == '\\') {
				*s++ = *p++;
				if (*p)
					*s++ = *p++;
			} else if (*p == '[') {
				while (*p != '\0' && *p != ']')
					*s++ = *p++;
			} else if (islower(*p)) {
				*s++ = '[';
				*s++ = toupper(*p);
				*s++ = *p++;
				*s++ = ']';
			} else
				*s++ = *p++;
			if (s >= ybuf+ESIZE-5)
				errexit("grep: argument too long\n", (char *)NULL);
		}
		*s = '\0';
		*argv = ybuf;
	}
	compile(*argv);
	nfile = --argc;
	if (argc<=0) {
		if (lflag)
			exit(1);
		execute((char *)NULL);
	} else while (--argc >= 0) {
		argv++;
		execute(*argv);
	}
	exit(nsucc == 0);
}

compile(astr)
char *astr;
{
	register c;
	register char *ep, *sp;
	char *cstart;
	char *lastep;
	int cclcnt;
	char bracket[NBRA], *bracketp;
	int closed;
	char numbra;
	char neg;

	ep = expbuf;
	sp = astr;
	lastep = 0;
	bracketp = bracket;
	closed = numbra = 0;
	if (*sp == '^') {
		circf++;
		sp++;
	}
	for (;;) {
		if (ep >= &expbuf[ESIZE])
			goto cerror;
		if ((c = *sp++) != '*')
			lastep = ep;
		switch (c) {

		case '\0':
			*ep++ = CEOF;
			return;

		case '.':
			*ep++ = CDOT;
			continue;

		case '*':
			if (lastep==0 || *lastep==CBRA || *lastep==CKET)
				goto defchar;
			*lastep |= STAR;
			continue;

		case '$':
			if (*sp != '\0')
				goto defchar;
			*ep++ = CDOL;
			continue;

		case '[':
			if(&ep[17] >= &expbuf[ESIZE])
				goto cerror;
			*ep++ = CCL;
			neg = 0;
			if((c = *sp++) == '^') {
				neg = 1;
				c = *sp++;
			}
			cstart = sp;
			do {
				if (c=='\0')
					goto cerror;
				if (c=='-' && sp>cstart && *sp!=']') {
					for (c = sp[-2]; c<*sp; c++)
						ep[c>>3] |= bittab[c&07];
					sp++;
				}
				ep[c>>3] |= bittab[c&07];
			} while((c = *sp++) != ']');
			if(neg) {
				for(cclcnt = 0; cclcnt < 16; cclcnt++)
					ep[cclcnt] ^= -1;
				ep[0] &= 0376;
			}

			ep += 16;

			continue;

		case '\\':
			if((c = *sp++) == '(') {
				if(numbra >= NBRA) {
					goto cerror;
				}
				*bracketp++ = numbra;
				*ep++ = CBRA;
				*ep++ = numbra++;
				continue;
			}
			if(c == ')') {
				if(bracketp <= bracket) {
					goto cerror;
				}
				*ep++ = CKET;
				*ep++ = *--bracketp;
				closed++;
				continue;
			}

			if(c >= '1' && c <= '9') {
				if((c -= '1') >= closed)
					goto cerror;
				*ep++ = CBACK;
				*ep++ = c;
				continue;
			}

		defchar:
		default:
			*ep++ = CCHR;
			*ep++ = c;
		}
	}
    cerror:
	errexit("grep: RE error\n", (char *)NULL);
}

execute(file)
char *file;
{
	register char *p1, *p2;
	register c;

	if (file) {
		if (freopen(file, "r", stdin) == NULL)
			errexit("grep: can't open %s\n", file);
	}
	lnum = 0;
	tln = 0;
	for (;;) {
		lnum++;
		p1 = linebuf;
		while ((c = getchar()) != '\n') {
			if (c == EOF) {
				if (cflag) {
					if (nfile>1)
						printf("%s:", file);
					printf("%D\n", tln);
					fflush(stdout);
				}
				return;
			}
			*p1++ = c;
			if (p1 >= &linebuf[LBSIZE-1])
				break;
		}
		*p1++ = '\0';
		p1 = linebuf;
		p2 = expbuf;
		if (circf) {
			if (advance(p1, p2))
				goto found;
			goto nfound;
		}
		/* fast check for first character */
		if (*p2==CCHR) {
			c = p2[1];
			do {
				if (*p1!=c)
					continue;
				if (advance(p1, p2))
					goto found;
			} while (*p1++);
			goto nfound;
		}
		/* regular algorithm */
		do {
			if (advance(p1, p2))
				goto found;
		} while (*p1++);
	nfound:
		if (vflag)
			succeed(file);
		continue;
	found:
		if (vflag==0)
			succeed(file);
	}
}

advance(lp, ep)
register char *lp, *ep;
{
	register char *curlp;
	char c;
	char *bbeg;
	int ct;

	for (;;) switch (*ep++) {

	case CCHR:
		if (*ep++ == *lp++)
			continue;
		return(0);

	case CDOT:
		if (*lp++)
			continue;
		return(0);

	case CDOL:
		if (*lp==0)
			continue;
		return(0);

	case CEOF:
		return(1);

	case CCL:
		c = *lp++ & 0177;
		if(ep[c>>3] & bittab[c & 07]) {
			ep += 16;
			continue;
		}
		return(0);
	case CBRA:
		braslist[*ep++] = lp;
		continue;

	case CKET:
		braelist[*ep++] = lp;
		continue;

	case CBACK:
		bbeg = braslist[*ep];
		if (braelist[*ep]==0)
			return(0);
		ct = braelist[*ep++] - bbeg;
		if(ecmp(bbeg, lp, ct)) {
			lp += ct;
			continue;
		}
		return(0);

	case CBACK|STAR:
		bbeg = braslist[*ep];
		if (braelist[*ep]==0)
			return(0);
		ct = braelist[*ep++] - bbeg;
		curlp = lp;
		while(ecmp(bbeg, lp, ct))
			lp += ct;
		while(lp >= curlp) {
			if(advance(lp, ep))	return(1);
			lp -= ct;
		}
		return(0);


	case CDOT|STAR:
		curlp = lp;
		while (*lp++);
		goto star;

	case CCHR|STAR:
		curlp = lp;
		while (*lp++ == *ep);
		ep++;
		goto star;

	case CCL|STAR:
		curlp = lp;
		do {
			c = *lp++ & 0177;
		} while(ep[c>>3] & bittab[c & 07]);
		ep += 16;
		goto star;

	star:
		if(--lp == curlp) {
			continue;
		}

		if(*ep == CCHR) {
			c = ep[1];
			do {
				if(*lp != c)
					continue;
				if(advance(lp, ep))
					return(1);
			} while(lp-- > curlp);
			return(0);
		}

		do {
			if (advance(lp, ep))
				return(1);
		} while (lp-- > curlp);
		return(0);

	default:
		errexit("grep RE botch\n", (char *)NULL);
	}
}

succeed(f)
char *f;
{
	nsucc = 1;
	if (sflag)
		return;
	if (cflag) {
		tln++;
		return;
	}
	if (lflag) {
		printf("%s\n", f);
		fflush(stdout);
		fseek(stdin, 0l, 2);
		return;
	}
	if (nfile > 1 && hflag)
		printf("%s:", f);
	if (bflag)
		printf("%u:", blkno);
	if (nflag)
		printf("%ld:", lnum);
	printf("%s\n", linebuf);
	fflush(stdout);
}

ecmp(a, b, count)
char	*a, *b;
{
	register cc = count;
	while(cc--)
		if(*a++ != *b++)	return(0);
	return(1);
}

errexit(s, f)
char *s, *f;
{
	fprintf(stderr, s, f);
	exit(2);
}
Commit	Line	Data
49d08d24 KM	1	/* old.bin.grep.c 4.1 82/05/07 */
	2
	3	/*
	4	* grep -- print lines matching (or not matching) a pattern
	5	*
	6	* status returns:
	7	* 0 - ok, and some matches
	8	* 1 - ok, but no matches
	9	* 2 - some error
	10	*/
	11
	12	#include <stdio.h>
	13	#include <ctype.h>
	14
	15	#define CBRA 1
	16	#define CCHR 2
	17	#define CDOT 4
	18	#define CCL 6
	19	#define NCCL 8
	20	#define CDOL 10
	21	#define CEOF 11
	22	#define CKET 12
	23	#define CBACK 18
	24
	25	#define STAR 01
	26
	27	#define LBSIZE BUFSIZ
	28	#define ESIZE 256
	29	#define NBRA 9
	30
	31	char expbuf[ESIZE];
	32	long lnum;
	33	char linebuf[LBSIZE+1];
	34	char ybuf[ESIZE];
	35	int bflag;
	36	int lflag;
	37	int nflag;
	38	int cflag;
	39	int vflag;
	40	int nfile;
	41	int hflag = 1;
	42	int sflag;
	43	int yflag;
	44	int circf;
	45	int blkno;
	46	long tln;
	47	int nsucc;
	48	char *braslist[NBRA];
	49	char *braelist[NBRA];
	50	char bittab[] = {
	51	1,
	52	2,
	53	4,
	54	8,
	55	16,
	56	32,
	57	64,
	58	128
	59	};
	60
	61	main(argc, argv)
	62	char **argv;
	63	{
	64	extern char _sobuf[];
65	setbuf(stdout, _sobuf);
66	while (--argc > 0 && (++argv)[0][0]=='-')
67	switch (argv[0][1]) {
68
69	case 'y':
70	yflag++;
71	continue;
72
73	case 'h':
74	hflag = 0;
75	continue;
76
77	case 's':
78	sflag++;
79	continue;
80
81	case 'v':
82	vflag++;
83	continue;
84
85	case 'b':
86	bflag++;
87	continue;
88
89	case 'l':
90	lflag++;
91	continue;
92
93	case 'c':
94	cflag++;
95	continue;
96
97	case 'n':
98	nflag++;
99	continue;
100
101	case 'e':
102	--argc;
103	++argv;
104	goto out;
105
106	default:
107	errexit("grep: unknown flag\n", (char *)NULL);
108	continue;
109	}
110	out:
111	if (argc<=0)
112	exit(2);
113	if (yflag) {
114	register char p, s;
115	for (s = ybuf, p = argv; p; ) {
116	if (*p == '\\') {
117	s++ = p++;
118	if (*p)
119	s++ = p++;
120	} else if (*p == '[') {
121	while (p != '\0' && p != ']')
122	s++ = p++;
123	} else if (islower(*p)) {
124	*s++ = '[';
125	s++ = toupper(p);
126	s++ = p++;
127	*s++ = ']';
128	} else
129	s++ = p++;
130	if (s >= ybuf+ESIZE-5)
131	errexit("grep: argument too long\n", (char *)NULL);
132	}
133	*s = '\0';
134	*argv = ybuf;
135	}
136	compile(*argv);
137	nfile = --argc;
138	if (argc<=0) {
139	if (lflag)
140	exit(1);
141	execute((char *)NULL);
142	} else while (--argc >= 0) {
143	argv++;
144	execute(*argv);
145	}
146	exit(nsucc == 0);
147	}
148
149	compile(astr)
150	char *astr;
151	{
152	register c;
153	register char ep, sp;
154	char *cstart;
155	char *lastep;
156	int cclcnt;
157	char bracket[NBRA], *bracketp;
158	int closed;
159	char numbra;
160	char neg;
161
162	ep = expbuf;
163	sp = astr;
164	lastep = 0;
165	bracketp = bracket;
166	closed = numbra = 0;
167	if (*sp == '^') {
168	circf++;
169	sp++;
170	}
171	for (;;) {
172	if (ep >= &expbuf[ESIZE])
173	goto cerror;
174	if ((c = sp++) != '')
175	lastep = ep;
176	switch (c) {
177
178	case '\0':
179	*ep++ = CEOF;
180	return;
181
182	case '.':
183	*ep++ = CDOT;
184	continue;
185
186	case '*':
187	if (lastep==0 \|\| lastep==CBRA \|\| lastep==CKET)
188	goto defchar;
189	*lastep \|= STAR;
190	continue;
191
192	case '$':
193	if (*sp != '\0')
194	goto defchar;
195	*ep++ = CDOL;
196	continue;
197
198	case '[':
199	if(&ep[17] >= &expbuf[ESIZE])
200	goto cerror;
201	*ep++ = CCL;
202	neg = 0;
203	if((c = *sp++) == '^') {
204	neg = 1;
205	c = *sp++;
206	}
207	cstart = sp;
208	do {
209	if (c=='\0')
210	goto cerror;
211	if (c=='-' && sp>cstart && *sp!=']') {
212	for (c = sp[-2]; c<*sp; c++)
213	ep[c>>3] \|= bittab[c&07];
214	sp++;
215	}
216	ep[c>>3] \|= bittab[c&07];
217	} while((c = *sp++) != ']');
218	if(neg) {
219	for(cclcnt = 0; cclcnt < 16; cclcnt++)
220	ep[cclcnt] ^= -1;
221	ep[0] &= 0376;
222	}
223
224	ep += 16;
225
226	continue;
227
228	case '\\':
229	if((c = *sp++) == '(') {
230	if(numbra >= NBRA) {
231	goto cerror;
232	}
233	*bracketp++ = numbra;
234	*ep++ = CBRA;
235	*ep++ = numbra++;
236	continue;
237	}
238	if(c == ')') {
239	if(bracketp <= bracket) {
240	goto cerror;
241	}
242	*ep++ = CKET;
243	ep++ = --bracketp;
244	closed++;
245	continue;
246	}
247
248	if(c >= '1' && c <= '9') {
249	if((c -= '1') >= closed)
250	goto cerror;
251	*ep++ = CBACK;
252	*ep++ = c;
253	continue;
254	}
255
256	defchar:
257	default:
258	*ep++ = CCHR;
259	*ep++ = c;
260	}
261	}
262	cerror:
263	errexit("grep: RE error\n", (char *)NULL);
264	}
265
266	execute(file)
267	char *file;
268	{
269	register char p1, p2;
270	register c;
271
272	if (file) {
273	if (freopen(file, "r", stdin) == NULL)
274	errexit("grep: can't open %s\n", file);
275	}
276	lnum = 0;
277	tln = 0;
278	for (;;) {
279	lnum++;
280	p1 = linebuf;
281	while ((c = getchar()) != '\n') {
282	if (c == EOF) {
283	if (cflag) {
284	if (nfile>1)
285	printf("%s:", file);
286	printf("%D\n", tln);
287	fflush(stdout);
288	}
289	return;
290	}
291	*p1++ = c;
292	if (p1 >= &linebuf[LBSIZE-1])
293	break;
294	}
295	*p1++ = '\0';
296	p1 = linebuf;
297	p2 = expbuf;
298	if (circf) {
299	if (advance(p1, p2))
300	goto found;
301	goto nfound;
302	}
303	/* fast check for first character */
304	if (*p2==CCHR) {
305	c = p2[1];
306	do {
307	if (*p1!=c)
308	continue;
309	if (advance(p1, p2))
310	goto found;
311	} while (*p1++);
312	goto nfound;
313	}
314	/* regular algorithm */
315	do {
316	if (advance(p1, p2))
317	goto found;
318	} while (*p1++);
319	nfound:
320	if (vflag)
321	succeed(file);
322	continue;
323	found:
324	if (vflag==0)
325	succeed(file);
326	}
327	}
328
329	advance(lp, ep)
330	register char lp, ep;
331	{
332	register char *curlp;
333	char c;
334	char *bbeg;
335	int ct;
336
337	for (;;) switch (*ep++) {
338
339	case CCHR:
340	if (ep++ == lp++)
341	continue;
342	return(0);
343
344	case CDOT:
345	if (*lp++)
346	continue;
347	return(0);
348
349	case CDOL:
350	if (*lp==0)
351	continue;
352	return(0);
353
354	case CEOF:
355	return(1);
356
357	case CCL:
358	c = *lp++ & 0177;
359	if(ep[c>>3] & bittab[c & 07]) {
360	ep += 16;
361	continue;
362	}
363	return(0);
364	case CBRA:
365	braslist[*ep++] = lp;
366	continue;
367
368	case CKET:
369	braelist[*ep++] = lp;
370	continue;
371
372	case CBACK:
373	bbeg = braslist[*ep];
374	if (braelist[*ep]==0)
375	return(0);
376	ct = braelist[*ep++] - bbeg;
377	if(ecmp(bbeg, lp, ct)) {
378	lp += ct;
379	continue;
380	}
381	return(0);
382
383	case CBACK\|STAR:
384	bbeg = braslist[*ep];
385	if (braelist[*ep]==0)
386	return(0);
387	ct = braelist[*ep++] - bbeg;
388	curlp = lp;
389	while(ecmp(bbeg, lp, ct))
390	lp += ct;
391	while(lp >= curlp) {
392	if(advance(lp, ep)) return(1);
393	lp -= ct;
394	}
395	return(0);
396
397
398	case CDOT\|STAR:
399	curlp = lp;
400	while (*lp++);
401	goto star;
402
403	case CCHR\|STAR:
404	curlp = lp;
405	while (lp++ == ep);
406	ep++;
407	goto star;
408
409	case CCL\|STAR:
410	curlp = lp;
411	do {
412	c = *lp++ & 0177;
413	} while(ep[c>>3] & bittab[c & 07]);
414	ep += 16;
415	goto star;
416
417	star:
418	if(--lp == curlp) {
419	continue;
420	}
421
422	if(*ep == CCHR) {
423	c = ep[1];
424	do {
425	if(*lp != c)
426	continue;
427	if(advance(lp, ep))
428	return(1);
429	} while(lp-- > curlp);
430	return(0);
431	}
432
433	do {
434	if (advance(lp, ep))
435	return(1);
436	} while (lp-- > curlp);
437	return(0);
438
439	default:
440	errexit("grep RE botch\n", (char *)NULL);
441	}
442	}
443
444	succeed(f)
445	char *f;
446	{
447	nsucc = 1;
448	if (sflag)
449	return;
450	if (cflag) {
451	tln++;
452	return;
453	}
454	if (lflag) {
455	printf("%s\n", f);
456	fflush(stdout);
457	fseek(stdin, 0l, 2);
458	return;
459	}
460	if (nfile > 1 && hflag)
461	printf("%s:", f);
462	if (bflag)
463	printf("%u:", blkno);
464	if (nflag)
465	printf("%ld:", lnum);
466	printf("%s\n", linebuf);
467	fflush(stdout);
468	}
469
470	ecmp(a, b, count)
471	char a, b;
472	{
473	register cc = count;
474	while(cc--)
475	if(a++ != b++) return(0);
476	return(1);
477	}
478
479	errexit(s, f)
480	char s, f;
481	{
482	fprintf(stderr, s, f);
483	exit(2);
484	}