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

/*
 * Copyright (c) 1980 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)xstr.c	5.7 (Berkeley) 2/26/91";
#endif /* not lint */

#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "pathnames.h"

/*
 * xstr - extract and hash strings in a C program
 *
 * Bill Joy UCB
 * November, 1978
 */

#define	ignore(a)	((void) a)

off_t	tellpt;
off_t	hashit();
void	onintr();
char	*savestr();
off_t	yankstr();

off_t	mesgpt;
char	*strings =	"strings";

int	cflg;
int	vflg;
int	readstd;

main(argc, argv)
	int argc;
	char *argv[];
{

	argc--, argv++;
	while (argc > 0 && argv[0][0] == '-') {
		register char *cp = &(*argv++)[1];

		argc--;
		if (*cp == 0) {
			readstd++;
			continue;
		}
		do switch (*cp++) {

		case 'c':
			cflg++;
			continue;

		case 'v':
			vflg++;
			continue;

		default:
			fprintf(stderr, "usage: xstr [ -v ] [ -c ] [ - ] [ name ... ]\n");
		} while (*cp);
	}
	if (signal(SIGINT, SIG_IGN) == SIG_DFL)
		signal(SIGINT, onintr);
	if (cflg || argc == 0 && !readstd)
		inithash();
	else
		strings = mktemp(strdup(_PATH_TMP));
	while (readstd || argc > 0) {
		if (freopen("x.c", "w", stdout) == NULL)
			perror("x.c"), exit(1);
		if (!readstd && freopen(argv[0], "r", stdin) == NULL)
			perror(argv[0]), exit(2);
		process("x.c");
		if (readstd == 0)
			argc--, argv++;
		else
			readstd = 0;
	};
	flushsh();
	if (cflg == 0)
		xsdotc();
	if (strings[0] == '/')
		ignore(unlink(strings));
	exit(0);
}

char linebuf[BUFSIZ];

process(name)
	char *name;
{
	char *cp;
	register int c;
	register int incomm = 0;
	int ret;

	printf("extern char\txstr[];\n");
	for (;;) {
		if (fgets(linebuf, sizeof linebuf, stdin) == NULL) {
			if (ferror(stdin)) {
				perror(name);
				exit(3);
			}
			break;
		}
		if (linebuf[0] == '#') {
			if (linebuf[1] == ' ' && isdigit(linebuf[2]))
				printf("#line%s", &linebuf[1]);
			else
				printf("%s", linebuf);
			continue;
		}
		for (cp = linebuf; c = *cp++;) switch (c) {
			
		case '"':
			if (incomm)
				goto def;
			if ((ret = (int) yankstr(&cp)) == -1)
				goto out;
			printf("(&xstr[%d])", ret);
			break;

		case '\'':
			if (incomm)
				goto def;
			putchar(c);
			if (*cp)
				putchar(*cp++);
			break;

		case '/':
			if (incomm || *cp != '*')
				goto def;
			incomm = 1;
			cp++;
			printf("/*");
			continue;

		case '*':
			if (incomm && *cp == '/') {
				incomm = 0;
				cp++;
				printf("*/");
				continue;
			}
			goto def;
		
def:
		default:
			putchar(c);
			break;
		}
	}
out:
	if (ferror(stdout))
		perror("x.c"), onintr();
}

off_t
yankstr(cpp)
	register char **cpp;
{
	register char *cp = *cpp;
	register int c, ch;
	char dbuf[BUFSIZ];
	register char *dp = dbuf;
	register char *tp;

	while (c = *cp++) {
		switch (c) {

		case '"':
			cp++;
			goto out;

		case '\\':
			c = *cp++;
			if (c == 0)
				break;
			if (c == '\n') {
				if (fgets(linebuf, sizeof linebuf, stdin) 
				    == NULL) {
					if (ferror(stdin)) {
						perror("x.c");
						exit(3);
					}
					return(-1);
				}
				cp = linebuf;
				continue;
			}
			for (tp = "b\bt\tr\rn\nf\f\\\\\"\""; ch = *tp++; tp++)
				if (c == ch) {
					c = *tp;
					goto gotc;
				}
			if (!octdigit(c)) {
				*dp++ = '\\';
				break;
			}
			c -= '0';
			if (!octdigit(*cp))
				break;
			c <<= 3, c += *cp++ - '0';
			if (!octdigit(*cp))
				break;
			c <<= 3, c += *cp++ - '0';
			break;
		}
gotc:
		*dp++ = c;
	}
out:
	*cpp = --cp;
	*dp = 0;
	return (hashit(dbuf, 1));
}

octdigit(c)
	char c;
{

	return (isdigit(c) && c != '8' && c != '9');
}

inithash()
{
	char buf[BUFSIZ];
	register FILE *mesgread = fopen(strings, "r");

	if (mesgread == NULL)
		return;
	for (;;) {
		mesgpt = tellpt;
		if (fgetNUL(buf, sizeof buf, mesgread) == NULL)
			break;
		ignore(hashit(buf, 0));
	}
	ignore(fclose(mesgread));
}

fgetNUL(obuf, rmdr, file)
	char *obuf;
	register int rmdr;
	FILE *file;
{
	register c;
	register char *buf = obuf;

	while (--rmdr > 0 && (c = xgetc(file)) != 0 && c != EOF)
		*buf++ = c;
	*buf++ = 0;
	return ((feof(file) || ferror(file)) ? NULL : 1);
}

xgetc(file)
	FILE *file;
{

	tellpt++;
	return (getc(file));
}

#define	BUCKETS	128

struct	hash {
	off_t	hpt;
	char	*hstr;
	struct	hash *hnext;
	short	hnew;
} bucket[BUCKETS];

off_t
hashit(str, new)
	char *str;
	int new;
{
	int i;
	register struct hash *hp, *hp0;

	hp = hp0 = &bucket[lastchr(str) & 0177];
	while (hp->hnext) {
		hp = hp->hnext;
		i = istail(str, hp->hstr);
		if (i >= 0)
			return (hp->hpt + i);
	}
	if ((hp = (struct hash *) calloc(1, sizeof (*hp))) == NULL) {
		perror("xstr");
		exit(8);
	}
	hp->hpt = mesgpt;
	if (!(hp->hstr = strdup(str))) {
		(void)fprintf(stderr, "xstr: %s\n", strerror(errno));
		exit(1);
	}
	mesgpt += strlen(hp->hstr) + 1;
	hp->hnext = hp0->hnext;
	hp->hnew = new;
	hp0->hnext = hp;
	return (hp->hpt);
}

flushsh()
{
	register int i;
	register struct hash *hp;
	register FILE *mesgwrit;
	register int old = 0, new = 0;

	for (i = 0; i < BUCKETS; i++)
		for (hp = bucket[i].hnext; hp != NULL; hp = hp->hnext)
			if (hp->hnew)
				new++;
			else
				old++;
	if (new == 0 && old != 0)
		return;
	mesgwrit = fopen(strings, old ? "r+" : "w");
	if (mesgwrit == NULL)
		perror(strings), exit(4);
	for (i = 0; i < BUCKETS; i++)
		for (hp = bucket[i].hnext; hp != NULL; hp = hp->hnext) {
			found(hp->hnew, hp->hpt, hp->hstr);
			if (hp->hnew) {
				fseek(mesgwrit, hp->hpt, 0);
				ignore(fwrite(hp->hstr, strlen(hp->hstr) + 1, 1, mesgwrit));
				if (ferror(mesgwrit))
					perror(strings), exit(4);
			}
		}
	if (fclose(mesgwrit) == EOF)
		perror(strings), exit(4);
}

found(new, off, str)
	int new;
	off_t off;
	char *str;
{
	if (vflg == 0)
		return;
	if (!new)
		fprintf(stderr, "found at %d:", (int) off);
	else
		fprintf(stderr, "new at %d:", (int) off);
	prstr(str);
	fprintf(stderr, "\n");
}

prstr(cp)
	register char *cp;
{
	register int c;

	while (c = (*cp++ & 0377))
		if (c < ' ')
			fprintf(stderr, "^%c", c + '`');
		else if (c == 0177)
			fprintf(stderr, "^?");
		else if (c > 0200)
			fprintf(stderr, "\\%03o", c);
		else
			fprintf(stderr, "%c", c);
}

xsdotc()
{
	register FILE *strf = fopen(strings, "r");
	register FILE *xdotcf;

	if (strf == NULL)
		perror(strings), exit(5);
	xdotcf = fopen("xs.c", "w");
	if (xdotcf == NULL)
		perror("xs.c"), exit(6);
	fprintf(xdotcf, "char\txstr[] = {\n");
	for (;;) {
		register int i, c;

		for (i = 0; i < 8; i++) {
			c = getc(strf);
			if (ferror(strf)) {
				perror(strings);
				onintr();
			}
			if (feof(strf)) {
				fprintf(xdotcf, "\n");
				goto out;
			}
			fprintf(xdotcf, "0x%02x,", c);
		}
		fprintf(xdotcf, "\n");
	}
out:
	fprintf(xdotcf, "};\n");
	ignore(fclose(xdotcf));
	ignore(fclose(strf));
}

lastchr(cp)
	register char *cp;
{

	while (cp[0] && cp[1])
		cp++;
	return (*cp);
}

istail(str, of)
	register char *str, *of;
{
	register int d = strlen(of) - strlen(str);

	if (d < 0 || strcmp(&of[d], str) != 0)
		return (-1);
	return (d);
}

void
onintr()
{

	ignore(signal(SIGINT, SIG_IGN));
	if (strings[0] == '/')
		ignore(unlink(strings));
	ignore(unlink("x.c"));
	ignore(unlink("xs.c"));
	exit(7);
}
Commit	Line	Data
30885fad WJ	1	/*
	2	* Copyright (c) 1980 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	char copyright[] =
	36	"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
	37	All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
	41	static char sccsid[] = "@(#)xstr.c 5.7 (Berkeley) 2/26/91";
	42	#endif /* not lint */
	43
	44	#include <sys/types.h>
	45	#include <signal.h>
	46	#include <errno.h>
	47	#include <unistd.h>
	48	#include <stdio.h>
	49	#include <ctype.h>
	50	#include <string.h>
	51	#include "pathnames.h"
	52
	53	/*
	54	* xstr - extract and hash strings in a C program
	55	*
	56	* Bill Joy UCB
	57	* November, 1978
	58	*/
	59
	60	#define ignore(a) ((void) a)
	61
	62	off_t tellpt;
	63	off_t hashit();
	64	void onintr();
65	char *savestr();
66	off_t yankstr();
67
68	off_t mesgpt;
69	char *strings = "strings";
70
71	int cflg;
72	int vflg;
73	int readstd;
74
75	main(argc, argv)
76	int argc;
77	char *argv[];
78	{
79
80	argc--, argv++;
81	while (argc > 0 && argv[0][0] == '-') {
82	register char cp = &(argv++)[1];
83
84	argc--;
85	if (*cp == 0) {
86	readstd++;
87	continue;
88	}
89	do switch (*cp++) {
90
91	case 'c':
92	cflg++;
93	continue;
94
95	case 'v':
96	vflg++;
97	continue;
98
99	default:
100	fprintf(stderr, "usage: xstr [ -v ] [ -c ] [ - ] [ name ... ]\n");
101	} while (*cp);
102	}
103	if (signal(SIGINT, SIG_IGN) == SIG_DFL)
104	signal(SIGINT, onintr);
105	if (cflg \|\| argc == 0 && !readstd)
106	inithash();
107	else
108	strings = mktemp(strdup(_PATH_TMP));
109	while (readstd \|\| argc > 0) {
110	if (freopen("x.c", "w", stdout) == NULL)
111	perror("x.c"), exit(1);
112	if (!readstd && freopen(argv[0], "r", stdin) == NULL)
113	perror(argv[0]), exit(2);
114	process("x.c");
115	if (readstd == 0)
116	argc--, argv++;
117	else
118	readstd = 0;
119	};
120	flushsh();
121	if (cflg == 0)
122	xsdotc();
123	if (strings[0] == '/')
124	ignore(unlink(strings));
125	exit(0);
126	}
127
128	char linebuf[BUFSIZ];
129
130	process(name)
131	char *name;
132	{
133	char *cp;
134	register int c;
135	register int incomm = 0;
136	int ret;
137
138	printf("extern char\txstr[];\n");
139	for (;;) {
140	if (fgets(linebuf, sizeof linebuf, stdin) == NULL) {
141	if (ferror(stdin)) {
142	perror(name);
143	exit(3);
144	}
145	break;
146	}
147	if (linebuf[0] == '#') {
148	if (linebuf[1] == ' ' && isdigit(linebuf[2]))
149	printf("#line%s", &linebuf[1]);
150	else
151	printf("%s", linebuf);
152	continue;
153	}
154	for (cp = linebuf; c = *cp++;) switch (c) {
155
156	case '"':
157	if (incomm)
158	goto def;
159	if ((ret = (int) yankstr(&cp)) == -1)
160	goto out;
161	printf("(&xstr[%d])", ret);
162	break;
163
164	case '\'':
165	if (incomm)
166	goto def;
167	putchar(c);
168	if (*cp)
169	putchar(*cp++);
170	break;
171
172	case '/':
173	if (incomm \|\| cp != '')
174	goto def;
175	incomm = 1;
176	cp++;
177	printf("/*");
178	continue;
179
180	case '*':
181	if (incomm && *cp == '/') {
182	incomm = 0;
183	cp++;
184	printf("*/");
185	continue;
186	}
187	goto def;
188
189	def:
190	default:
191	putchar(c);
192	break;
193	}
194	}
195	out:
196	if (ferror(stdout))
197	perror("x.c"), onintr();
198	}
199
200	off_t
201	yankstr(cpp)
202	register char **cpp;
203	{
204	register char cp = cpp;
205	register int c, ch;
206	char dbuf[BUFSIZ];
207	register char *dp = dbuf;
208	register char *tp;
209
210	while (c = *cp++) {
211	switch (c) {
212
213	case '"':
214	cp++;
215	goto out;
216
217	case '\\':
218	c = *cp++;
219	if (c == 0)
220	break;
221	if (c == '\n') {
222	if (fgets(linebuf, sizeof linebuf, stdin)
223	== NULL) {
224	if (ferror(stdin)) {
225	perror("x.c");
226	exit(3);
227	}
228	return(-1);
229	}
230	cp = linebuf;
231	continue;
232	}
233	for (tp = "b\bt\tr\rn\nf\f\\\\\"\""; ch = *tp++; tp++)
234	if (c == ch) {
235	c = *tp;
236	goto gotc;
237	}
238	if (!octdigit(c)) {
239	*dp++ = '\\';
240	break;
241	}
242	c -= '0';
243	if (!octdigit(*cp))
244	break;
245	c <<= 3, c += *cp++ - '0';
246	if (!octdigit(*cp))
247	break;
248	c <<= 3, c += *cp++ - '0';
249	break;
250	}
251	gotc:
252	*dp++ = c;
253	}
254	out:
255	*cpp = --cp;
256	*dp = 0;
257	return (hashit(dbuf, 1));
258	}
259
260	octdigit(c)
261	char c;
262	{
263
264	return (isdigit(c) && c != '8' && c != '9');
265	}
266
267	inithash()
268	{
269	char buf[BUFSIZ];
270	register FILE *mesgread = fopen(strings, "r");
271
272	if (mesgread == NULL)
273	return;
274	for (;;) {
275	mesgpt = tellpt;
276	if (fgetNUL(buf, sizeof buf, mesgread) == NULL)
277	break;
278	ignore(hashit(buf, 0));
279	}
280	ignore(fclose(mesgread));
281	}
282
283	fgetNUL(obuf, rmdr, file)
284	char *obuf;
285	register int rmdr;
286	FILE *file;
287	{
288	register c;
289	register char *buf = obuf;
290
291	while (--rmdr > 0 && (c = xgetc(file)) != 0 && c != EOF)
292	*buf++ = c;
293	*buf++ = 0;
294	return ((feof(file) \|\| ferror(file)) ? NULL : 1);
295	}
296
297	xgetc(file)
298	FILE *file;
299	{
300
301	tellpt++;
302	return (getc(file));
303	}
304
305	#define BUCKETS 128
306
307	struct hash {
308	off_t hpt;
309	char *hstr;
310	struct hash *hnext;
311	short hnew;
312	} bucket[BUCKETS];
313
314	off_t
315	hashit(str, new)
316	char *str;
317	int new;
318	{
319	int i;
320	register struct hash hp, hp0;
321
322	hp = hp0 = &bucket[lastchr(str) & 0177];
323	while (hp->hnext) {
324	hp = hp->hnext;
325	i = istail(str, hp->hstr);
326	if (i >= 0)
327	return (hp->hpt + i);
328	}
329	if ((hp = (struct hash ) calloc(1, sizeof (hp))) == NULL) {
330	perror("xstr");
331	exit(8);
332	}
333	hp->hpt = mesgpt;
334	if (!(hp->hstr = strdup(str))) {
335	(void)fprintf(stderr, "xstr: %s\n", strerror(errno));
336	exit(1);
337	}
338	mesgpt += strlen(hp->hstr) + 1;
339	hp->hnext = hp0->hnext;
340	hp->hnew = new;
341	hp0->hnext = hp;
342	return (hp->hpt);
343	}
344
345	flushsh()
346	{
347	register int i;
348	register struct hash *hp;
349	register FILE *mesgwrit;
350	register int old = 0, new = 0;
351
352	for (i = 0; i < BUCKETS; i++)
353	for (hp = bucket[i].hnext; hp != NULL; hp = hp->hnext)
354	if (hp->hnew)
355	new++;
356	else
357	old++;
358	if (new == 0 && old != 0)
359	return;
360	mesgwrit = fopen(strings, old ? "r+" : "w");
361	if (mesgwrit == NULL)
362	perror(strings), exit(4);
363	for (i = 0; i < BUCKETS; i++)
364	for (hp = bucket[i].hnext; hp != NULL; hp = hp->hnext) {
365	found(hp->hnew, hp->hpt, hp->hstr);
366	if (hp->hnew) {
367	fseek(mesgwrit, hp->hpt, 0);
368	ignore(fwrite(hp->hstr, strlen(hp->hstr) + 1, 1, mesgwrit));
369	if (ferror(mesgwrit))
370	perror(strings), exit(4);
371	}
372	}
373	if (fclose(mesgwrit) == EOF)
374	perror(strings), exit(4);
375	}
376
377	found(new, off, str)
378	int new;
379	off_t off;
380	char *str;
381	{
382	if (vflg == 0)
383	return;
384	if (!new)
385	fprintf(stderr, "found at %d:", (int) off);
386	else
387	fprintf(stderr, "new at %d:", (int) off);
388	prstr(str);
389	fprintf(stderr, "\n");
390	}
391
392	prstr(cp)
393	register char *cp;
394	{
395	register int c;
396
397	while (c = (*cp++ & 0377))
398	if (c < ' ')
399	fprintf(stderr, "^%c", c + '`');
400	else if (c == 0177)
401	fprintf(stderr, "^?");
402	else if (c > 0200)
403	fprintf(stderr, "\\%03o", c);
404	else
405	fprintf(stderr, "%c", c);
406	}
407
408	xsdotc()
409	{
410	register FILE *strf = fopen(strings, "r");
411	register FILE *xdotcf;
412
413	if (strf == NULL)
414	perror(strings), exit(5);
415	xdotcf = fopen("xs.c", "w");
416	if (xdotcf == NULL)
417	perror("xs.c"), exit(6);
418	fprintf(xdotcf, "char\txstr[] = {\n");
419	for (;;) {
420	register int i, c;
421
422	for (i = 0; i < 8; i++) {
423	c = getc(strf);
424	if (ferror(strf)) {
425	perror(strings);
426	onintr();
427	}
428	if (feof(strf)) {
429	fprintf(xdotcf, "\n");
430	goto out;
431	}
432	fprintf(xdotcf, "0x%02x,", c);
433	}
434	fprintf(xdotcf, "\n");
435	}
436	out:
437	fprintf(xdotcf, "};\n");
438	ignore(fclose(xdotcf));
439	ignore(fclose(strf));
440	}
441
442	lastchr(cp)
443	register char *cp;
444	{
445
446	while (cp[0] && cp[1])
447	cp++;
448	return (*cp);
449	}
450
451	istail(str, of)
452	register char str, of;
453	{
454	register int d = strlen(of) - strlen(str);
455
456	if (d < 0 \|\| strcmp(&of[d], str) != 0)
457	return (-1);
458	return (d);
459	}
460
461	void
462	onintr()
463	{
464
465	ignore(signal(SIGINT, SIG_IGN));
466	if (strings[0] == '/')
467	ignore(unlink(strings));
468	ignore(unlink("x.c"));
469	ignore(unlink("xs.c"));
470	exit(7);
471	}