1 /*
2 * Copyright (c) 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char copyright[] =
10 "@(#) Copyright (c) 1993\n\
11 The Regents of the University of California. All rights reserved.\n";
12 #endif /* not lint */
13
14 #ifndef lint
15 static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 04/28/95";
16 #endif /* not lint */
17
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <sys/time.h>
21
22 #include <err.h>
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <time.h>
29 #include <unistd.h>
30
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));
36
37 int
main(argc,argv)38 main(argc, argv)
39 int argc;
40 char *argv[];
41 {
42 struct stat sb;
43 struct timeval tv[2];
44 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
45 char *p;
46
47 aflag = cflag = fflag = mflag = timeset = 0;
48 if (gettimeofday(&tv[0], NULL))
49 err(1, "gettimeofday");
50
51 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF)
52 switch(ch) {
53 case 'a':
54 aflag = 1;
55 break;
56 case 'c':
57 cflag = 1;
58 break;
59 case 'f':
60 fflag = 1;
61 break;
62 case 'm':
63 mflag = 1;
64 break;
65 case 'r':
66 timeset = 1;
67 stime_file(optarg, tv);
68 break;
69 case 't':
70 timeset = 1;
71 stime_arg1(optarg, tv);
72 break;
73 case '?':
74 default:
75 usage();
76 }
77 argc -= optind;
78 argv += optind;
79
80 /* Default is both -a and -m. */
81 if (aflag == 0 && mflag == 0)
82 aflag = mflag = 1;
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++, 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)
102 usage();
103
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, DEFFILEMODE);
111 if (fd == -1 || fstat(fd, &sb) || close(fd)) {
112 rval = 1;
113 warn("%s", *argv);
114 continue;
115 }
116
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 /*
139 * System V and POSIX 1003.1 require that a NULL argument
140 * set the access/modification times to the current time.
141 * The permission checks are different, too, in that the
142 * ability to write the file is sufficient. Take a shot.
143 */
144 if (!utimes(*argv, NULL))
145 continue;
146
147 /* Try reading/writing. */
148 if (rw(*argv, &sb, fflag))
149 rval = 1;
150 }
151 exit(rval);
152 }
153
154 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
155
156 void
stime_arg1(arg,tvp)157 stime_arg1(arg, tvp)
158 char *arg;
159 struct timeval *tvp;
160 {
161 struct tm *t;
162 int yearset;
163 char *p;
164 /* Start with the current time. */
165 if ((t = localtime(&tvp[0].tv_sec)) == NULL)
166 err(1, "localtime");
167 /* [[CC]YY]MMDDhhmm[.SS] */
168 if ((p = strchr(arg, '.')) == NULL)
169 t->tm_sec = 0; /* Seconds defaults to 0. */
170 else {
171 if (strlen(p + 1) != 2)
172 goto terr;
173 *p++ = '\0';
174 t->tm_sec = ATOI2(p);
175 }
176
177 yearset = 0;
178 switch(strlen(arg)) {
179 case 12: /* CCYYMMDDhhmm */
180 t->tm_year = ATOI2(arg);
181 t->tm_year *= 100;
182 yearset = 1;
183 /* FALLTHOUGH */
184 case 10: /* YYMMDDhhmm */
185 if (yearset) {
186 yearset = ATOI2(arg);
187 t->tm_year += yearset;
188 } else {
189 yearset = ATOI2(arg);
190 if (yearset < 69)
191 t->tm_year = yearset + 2000;
192 else
193 t->tm_year = yearset + 1900;
194 }
195 t->tm_year -= 1900; /* Convert to UNIX time. */
196 /* FALLTHROUGH */
197 case 8: /* MMDDhhmm */
198 t->tm_mon = ATOI2(arg);
199 --t->tm_mon; /* Convert from 01-12 to 00-11 */
200 t->tm_mday = ATOI2(arg);
201 t->tm_hour = ATOI2(arg);
202 t->tm_min = ATOI2(arg);
203 break;
204 default:
205 goto terr;
206 }
207
208 t->tm_isdst = -1; /* Figure out DST. */
209 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
210 if (tvp[0].tv_sec == -1)
211 terr: errx(1,
212 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
213
214 tvp[0].tv_usec = tvp[1].tv_usec = 0;
215 }
216
217 void
stime_arg2(arg,year,tvp)218 stime_arg2(arg, year, tvp)
219 char *arg;
220 int year;
221 struct timeval *tvp;
222 {
223 struct tm *t;
224 /* Start with the current time. */
225 if ((t = localtime(&tvp[0].tv_sec)) == NULL)
226 err(1, "localtime");
227
228 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */
229 --t->tm_mon; /* Convert from 01-12 to 00-11 */
230 t->tm_mday = ATOI2(arg);
231 t->tm_hour = ATOI2(arg);
232 t->tm_min = ATOI2(arg);
233 if (year)
234 t->tm_year = ATOI2(arg);
235
236 t->tm_isdst = -1; /* Figure out DST. */
237 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
238 if (tvp[0].tv_sec == -1)
239 errx(1,
240 "out of range or illegal time specification: MMDDhhmm[yy]");
241
242 tvp[0].tv_usec = tvp[1].tv_usec = 0;
243 }
244
245 void
stime_file(fname,tvp)246 stime_file(fname, tvp)
247 char *fname;
248 struct timeval *tvp;
249 {
250 struct stat sb;
251
252 if (stat(fname, &sb))
253 err(1, "%s", fname);
254 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
255 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
256 }
257
258 int
rw(fname,sbp,force)259 rw(fname, sbp, force)
260 char *fname;
261 struct stat *sbp;
262 int force;
263 {
264 int fd, needed_chmod, rval;
265 u_char byte;
266
267 /* Try regular files and directories. */
268 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
269 warnx("%s: %s", fname, strerror(EFTYPE));
270 return (1);
271 }
272
273 needed_chmod = rval = 0;
274 if ((fd = open(fname, O_RDWR, 0)) == -1) {
275 if (!force || chmod(fname, DEFFILEMODE))
276 goto err;
277 if ((fd = open(fname, O_RDWR, 0)) == -1)
278 goto err;
279 needed_chmod = 1;
280 }
281
282 if (sbp->st_size != 0) {
283 if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
284 goto err;
285 if (lseek(fd, (off_t)0, SEEK_SET) == -1)
286 goto err;
287 if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
288 goto err;
289 } else {
290 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
291 err: rval = 1;
292 warn("%s", fname);
293 } else if (ftruncate(fd, (off_t)0)) {
294 rval = 1;
295 warn("%s: file modified", fname);
296 }
297 }
298
299 if (close(fd) && rval != 1) {
300 rval = 1;
301 warn("%s", fname);
302 }
303 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
304 rval = 1;
305 warn("%s: permissions modified", fname);
306 }
307 return (rval);
308 }
309
310 __dead void
usage()311 usage()
312 {
313 (void)fprintf(stderr,
314 "usage: touch [-acfm] [-r file] [-t time] file ...\n");
315 exit(1);
316 }
317