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

/*
 * Copyright (c) 1993 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1993 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)touch.c	5.2 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

int	rw __P((char *, struct stat *, int));
void	stime_arg1 __P((char *, struct timeval *));
void	stime_arg2 __P((char *, int, struct timeval *));
void	stime_file __P((char *, struct timeval *));
void	usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct stat sb;
	struct timeval tv[2];
	int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
	char *p;

	aflag = mflag = 1;
	cflag = fflag = timeset = 0;

	if (gettimeofday(&tv[0], NULL))
		err(1, "gettimeofday");

	while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF)
		switch(ch) {
		case 'a':
			aflag = 1;
			mflag = 0;
			break;
		case 'c':
			cflag = 1;
			break;
		case 'f':
			fflag = 1;
			break;
		case 'm':
			aflag = 0;
			mflag = 1;
			break;
		case 'r':
			timeset = 1;
			stime_file(optarg, tv);
			break;
		case 't':
			timeset = 1;
			stime_arg1(optarg, tv);
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	/*
	 * If no -r or -t flag, at least two operands, the first of which
	 * is an 8 or 10 digit number, use the obsolete time specification.
	 */
	if (!timeset && argc > 1) {
		(void)strtol(argv[0], &p, 10);
		len = p - argv[0];
		if (*p == '\0' && (len == 8 || len == 10)) {
			timeset = 1;
			stime_arg2(argv[0], len == 10, tv);
		}
	}

	/* Otherwise use the current time of day. */
	if (!timeset)
		tv[1] = tv[0];

	if (*argv == NULL)
		usage();

	for (rval = 0; *argv; ++argv) {
		/* See if the file exists. */
		if (stat(*argv, &sb))
			if (!cflag) {
				/* Create the file. */
				fd = open(*argv,
				    O_WRONLY | O_CREAT | O_TRUNC, DEFFILEMODE);
				if (fd == -1 || fstat(fd, &sb) || close(fd)) {
					rval = 1;
					warn("%s", *argv);
					continue;
				}

				/* If using the current time, we're done. */
				if (!timeset)
					continue;
			} else
				continue;

		if (!aflag)
			TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
		if (!mflag)
			TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);

		/* Try utimes(2). */
		if (!utimes(*argv, tv))
			continue;

		/* If the user specified a time, nothing else we can do. */
		if (timeset) {
			rval = 1;
			warn("%s", *argv);
		}

		/* Try reading/writing. */
		if (rw(*argv, &sb, fflag))
			rval = 1;
	}
	exit(rval);
}

#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;

void
stime_arg1(arg, tvp)
	char *arg;
	struct timeval *tvp;
{
	struct tm *t;
	int yearset;
	char *p;
					/* Start with the current time. */
	if ((t = localtime(&tvp[0].tv_sec)) == NULL)
		err(1, "localtime");
					/* [[CC]YY]MMDDhhmm[.SS] */
	if ((p = strchr(arg, '.')) == NULL)
		t->tm_sec = 0;		/* Seconds defaults to 0. */
	else {
		if (strlen(p + 1) != 2)
			goto terr;
		*p++ = '\0';
		t->tm_sec = ATOI2(p);
	}
		
	yearset = 0;
	switch(strlen(arg)) {
	case 12:			/* CCYYMMDDhhmm */
		t->tm_year = ATOI2(arg);
		t->tm_year *= 1000;
		yearset = 1;
		/* FALLTHOUGH */
	case 10:			/* YYMMDDhhmm */
		if (yearset) {
			yearset = ATOI2(arg);
			t->tm_year += yearset;
		} else {
			yearset = ATOI2(arg);
			if (yearset < 69)
				t->tm_year = yearset + 2000;
			else
				t->tm_year = yearset + 1900;
		}
		t->tm_year -= 1900;	/* Convert to UNIX time. */
		/* FALLTHROUGH */
	case 8:				/* MMDDhhmm */
		t->tm_mon = ATOI2(arg);
		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
		t->tm_mday = ATOI2(arg);
		t->tm_hour = ATOI2(arg);
		t->tm_min = ATOI2(arg);
		break;
	default:
		goto terr;
	}

	t->tm_isdst = -1;		/* Figure out DST. */
	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
	if (tvp[0].tv_sec == -1)
terr:		errx(1,
	"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");

	tvp[0].tv_usec = tvp[1].tv_usec = 0;
}

void
stime_arg2(arg, year, tvp)
	char *arg;
	int year;
	struct timeval *tvp;
{
	struct tm *t;
					/* Start with the current time. */
	if ((t = localtime(&tvp[0].tv_sec)) == NULL)
		err(1, "localtime");

	t->tm_mon = ATOI2(arg);		/* MMDDhhmm[yy] */
	--t->tm_mon;			/* Convert from 01-12 to 00-11 */
	t->tm_mday = ATOI2(arg);
	t->tm_hour = ATOI2(arg);
	t->tm_min = ATOI2(arg);
	if (year)
		t->tm_year = ATOI2(arg);

	t->tm_isdst = -1;		/* Figure out DST. */
	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
	if (tvp[0].tv_sec == -1)
		errx(1,
	"out of range or illegal time specification: MMDDhhmm[yy]");

	tvp[0].tv_usec = tvp[1].tv_usec = 0;
}

void
stime_file(fname, tvp)
	char *fname;
	struct timeval *tvp;
{
	struct stat sb;

	if (stat(fname, &sb))
		err(1, "%s", fname);
	TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
	TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
}

int
rw(fname, sbp, force)
	char *fname;
	struct stat *sbp;
	int force;
{
	int fd, needed_chmod, rval;
	u_char byte;

	/* Try regular files and directories. */
	if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
		warnx("%s: %s", fname, strerror(EFTYPE));
		return (1);
	}

	needed_chmod = rval = 0;
	if ((fd = open(fname, O_RDWR, 0)) == -1) {
		if (!force || chmod(fname, DEFFILEMODE))
			goto err;
		if ((fd = open(fname, O_RDWR, 0)) == -1)
			goto err;
		needed_chmod = 1;
	}

	if (sbp->st_size != 0) {
		if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
			goto err;
		if (lseek(fd, (off_t)0, SEEK_SET) == -1)
			goto err;
		if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
			goto err;
	} else {
		if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
err:			rval = 1;
			warn("%s", fname);
		} else if (ftruncate(fd, (off_t)0)) {
			rval = 1;
			warn("%s: file modified", fname);
		}
	}

	if (close(fd) && rval != 1) {
		rval = 1;
		warn("%s", fname);
	}
	if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
		rval = 1;
		warn("%s: permissions modified", fname);
	}
	return (rval);
}

__dead void
usage()
{
	(void)fprintf(stderr,
	    "usage: touch [-acfm] [-r file] [-t time] file ...\n");
	exit(1);
}
Commit	Line	Data
b4008fc5	1	/*
0581f0f9	2	* Copyright (c) 1993 Regents of the University of California.
b4008fc5 KB	3	* All rights reserved.
b4008fc5 KB	4	*
cb956e54	5	* %sccs.include.redist.c%
b4008fc5 KB	6	*/
	7
	8	#ifndef lint
	9	char copyright[] =
0581f0f9	10	"@(#) Copyright (c) 1993 Regents of the University of California.\n\
b4008fc5 KB	11	All rights reserved.\n";
	12	#endif /* not lint */
	13
f6227721	14	#ifndef lint
0581f0f9	15	static char sccsid[] = "@(#)touch.c 5.2 (Berkeley) %G%";
b4008fc5	16	#endif /* not lint */
0219f737	17
0219f737 KM	18	#include <sys/types.h>
0219f737 KM	19	#include <sys/stat.h>
0581f0f9	20	#include <sys/time.h>
7d70e53d	21
0581f0f9	22	#include <err.h>
7d70e53d KB	23	#include <errno.h>
7d70e53d KB	24	#include <fcntl.h>
b4008fc5	25	#include <stdio.h>
7d70e53d KB	26	#include <stdlib.h>
7d70e53d KB	27	#include <string.h>
0581f0f9	28	#include <time.h>
7d70e53d	29	#include <unistd.h>
0219f737	30
0581f0f9 KB	31	int rw __P((char , struct stat , int));
	32	void stime_arg1 __P((char , struct timeval ));
	33	void stime_arg2 __P((char , int, struct timeval ));
	34	void stime_file __P((char , struct timeval ));
	35	void usage __P((void));
7d70e53d KB	36
7d70e53d KB	37	int
0dd5dde6	38	main(argc, argv)
b4008fc5	39	int argc;
7d70e53d	40	char *argv[];
7add65c5	41	{
0581f0f9 KB	42	struct stat sb;
	43	struct timeval tv[2];
	44	int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
	45	char *p;
7add65c5	46
0581f0f9 KB	47	aflag = mflag = 1;
	48	cflag = fflag = timeset = 0;
	49
	50	if (gettimeofday(&tv[0], NULL))
	51	err(1, "gettimeofday");
	52
	53	while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF)
	54	switch(ch) {
	55	case 'a':
	56	aflag = 1;
	57	mflag = 0;
	58	break;
7868c57c	59	case 'c':
0581f0f9	60	cflag = 1;
7868c57c KB	61	break;
7868c57c KB	62	case 'f':
0581f0f9 KB	63	fflag = 1;
	64	break;
	65	case 'm':
	66	aflag = 0;
	67	mflag = 1;
	68	break;
	69	case 'r':
	70	timeset = 1;
	71	stime_file(optarg, tv);
	72	break;
	73	case 't':
	74	timeset = 1;
	75	stime_arg1(optarg, tv);
7868c57c KB	76	break;
	77	case '?':
	78	default:
0dd5dde6	79	usage();
0219f737	80	}
0581f0f9 KB	81	argc -= optind;
	82	argv += optind;
	83
	84	/*
	85	* If no -r or -t flag, at least two operands, the first of which
	86	* is an 8 or 10 digit number, use the obsolete time specification.
	87	*/
	88	if (!timeset && argc > 1) {
	89	(void)strtol(argv[0], &p, 10);
	90	len = p - argv[0];
	91	if (*p == '\0' && (len == 8 \|\| len == 10)) {
	92	timeset = 1;
	93	stime_arg2(argv[0], len == 10, tv);
	94	}
	95	}
	96
	97	/* Otherwise use the current time of day. */
	98	if (!timeset)
	99	tv[1] = tv[0];
	100
	101	if (*argv == NULL)
0dd5dde6	102	usage();
7add65c5	103
0581f0f9 KB	104	for (rval = 0; *argv; ++argv) {
	105	/* See if the file exists. */
	106	if (stat(*argv, &sb))
	107	if (!cflag) {
	108	/* Create the file. */
	109	fd = open(*argv,
	110	O_WRONLY \| O_CREAT \| O_TRUNC, DEFFILEMODE);
	111	if (fd == -1 \|\| fstat(fd, &sb) \|\| close(fd)) {
	112	rval = 1;
	113	warn("%s", *argv);
	114	continue;
	115	}
7add65c5	116
0581f0f9 KB	117	/* If using the current time, we're done. */
	118	if (!timeset)
	119	continue;
	120	} else
	121	continue;
	122
	123	if (!aflag)
	124	TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
	125	if (!mflag)
	126	TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
	127
	128	/* Try utimes(2). */
	129	if (!utimes(*argv, tv))
	130	continue;
	131
	132	/* If the user specified a time, nothing else we can do. */
	133	if (timeset) {
	134	rval = 1;
	135	warn("%s", *argv);
	136	}
	137
	138	/* Try reading/writing. */
	139	if (rw(*argv, &sb, fflag))
	140	rval = 1;
0219f737	141	}
0581f0f9 KB	142	exit(rval);
	143	}
	144
	145	#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
	146
	147	void
	148	stime_arg1(arg, tvp)
	149	char *arg;
	150	struct timeval *tvp;
	151	{
	152	struct tm *t;
	153	int yearset;
	154	char *p;
	155	/* Start with the current time. */
	156	if ((t = localtime(&tvp[0].tv_sec)) == NULL)
	157	err(1, "localtime");
	158	/* [[CC]YY]MMDDhhmm[.SS] */
	159	if ((p = strchr(arg, '.')) == NULL)
	160	t->tm_sec = 0; /* Seconds defaults to 0. */
	161	else {
	162	if (strlen(p + 1) != 2)
	163	goto terr;
	164	*p++ = '\0';
	165	t->tm_sec = ATOI2(p);
0219f737	166	}
0581f0f9 KB	167
	168	yearset = 0;
	169	switch(strlen(arg)) {
	170	case 12: /* CCYYMMDDhhmm */
	171	t->tm_year = ATOI2(arg);
	172	t->tm_year *= 1000;
	173	yearset = 1;
	174	/* FALLTHOUGH */
	175	case 10: /* YYMMDDhhmm */
	176	if (yearset) {
	177	yearset = ATOI2(arg);
	178	t->tm_year += yearset;
	179	} else {
	180	yearset = ATOI2(arg);
	181	if (yearset < 69)
	182	t->tm_year = yearset + 2000;
	183	else
	184	t->tm_year = yearset + 1900;
7add65c5	185	}
0581f0f9 KB	186	t->tm_year -= 1900; /* Convert to UNIX time. */
	187	/* FALLTHROUGH */
	188	case 8: /* MMDDhhmm */
	189	t->tm_mon = ATOI2(arg);
	190	--t->tm_mon; /* Convert from 01-12 to 00-11 */
	191	t->tm_mday = ATOI2(arg);
	192	t->tm_hour = ATOI2(arg);
	193	t->tm_min = ATOI2(arg);
	194	break;
	195	default:
	196	goto terr;
0219f737	197	}
0581f0f9 KB	198
	199	t->tm_isdst = -1; /* Figure out DST. */
	200	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
	201	if (tvp[0].tv_sec == -1)
	202	terr: errx(1,
	203	"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
	204
	205	tvp[0].tv_usec = tvp[1].tv_usec = 0;
	206	}
	207
	208	void
	209	stime_arg2(arg, year, tvp)
	210	char *arg;
	211	int year;
	212	struct timeval *tvp;
	213	{
	214	struct tm *t;
	215	/* Start with the current time. */
	216	if ((t = localtime(&tvp[0].tv_sec)) == NULL)
	217	err(1, "localtime");
	218
	219	t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */
	220	--t->tm_mon; /* Convert from 01-12 to 00-11 */
	221	t->tm_mday = ATOI2(arg);
	222	t->tm_hour = ATOI2(arg);
	223	t->tm_min = ATOI2(arg);
	224	if (year)
	225	t->tm_year = ATOI2(arg);
	226
	227	t->tm_isdst = -1; /* Figure out DST. */
	228	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
	229	if (tvp[0].tv_sec == -1)
	230	errx(1,
	231	"out of range or illegal time specification: MMDDhhmm[yy]");
	232
	233	tvp[0].tv_usec = tvp[1].tv_usec = 0;
	234	}
	235
	236	void
	237	stime_file(fname, tvp)
	238	char *fname;
	239	struct timeval *tvp;
	240	{
	241	struct stat sb;
	242
	243	if (stat(fname, &sb))
	244	err(1, "%s", fname);
	245	TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
	246	TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
0219f737	247	}
7add65c5	248
7d70e53d	249	int
0581f0f9 KB	250	rw(fname, sbp, force)
	251	char *fname;
	252	struct stat *sbp;
	253	int force;
0219f737	254	{
0581f0f9 KB	255	int fd, needed_chmod, rval;
	256	u_char byte;
	257
	258	/* Try regular files and directories. */
	259	if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
	260	warnx("%s: %s", fname, strerror(EFTYPE));
	261	return (1);
	262	}
	263
	264	needed_chmod = rval = 0;
	265	if ((fd = open(fname, O_RDWR, 0)) == -1) {
	266	if (!force \|\| chmod(fname, DEFFILEMODE))
	267	goto err;
	268	if ((fd = open(fname, O_RDWR, 0)) == -1)
	269	goto err;
	270	needed_chmod = 1;
	271	}
	272
	273	if (sbp->st_size != 0) {
	274	if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
	275	goto err;
7d70e53d	276	if (lseek(fd, (off_t)0, SEEK_SET) == -1)
0581f0f9 KB	277	goto err;
	278	if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
	279	goto err;
0219f737	280	} else {
0581f0f9 KB	281	if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
	282	err: rval = 1;
	283	warn("%s", fname);
	284	} else if (ftruncate(fd, (off_t)0)) {
	285	rval = 1;
	286	warn("%s: file modified", fname);
	287	}
7add65c5	288	}
0581f0f9 KB	289
	290	if (close(fd) && rval != 1) {
	291	rval = 1;
	292	warn("%s", fname);
	293	}
	294	if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
	295	rval = 1;
	296	warn("%s: permissions modified", fname);
7d70e53d	297	}
0581f0f9	298	return (rval);
0dd5dde6 KB	299	}
0dd5dde6 KB	300
7d70e53d	301	__dead void
0dd5dde6 KB	302	usage()
0dd5dde6 KB	303	{
0581f0f9 KB	304	(void)fprintf(stderr,
0581f0f9 KB	305	"usage: touch [-acfm] [-r file] [-t time] file ...\n");
0dd5dde6	306	exit(1);
7add65c5	307	}