Annotation of src/usr.bin/touch/touch.c, Revision 1.10
1.10 ! deraadt 1: /* $OpenBSD: touch.c,v 1.9 2003/06/03 02:56:20 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: touch.c,v 1.11 1995/08/31 22:10:06 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.9 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #ifndef lint
34: static char copyright[] =
35: "@(#) Copyright (c) 1993\n\
36: The Regents of the University of California. All rights reserved.\n";
37: #endif /* not lint */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95";
42: #endif
1.10 ! deraadt 43: static char rcsid[] = "$OpenBSD: touch.c,v 1.9 2003/06/03 02:56:20 millert Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: #include <sys/types.h>
47: #include <sys/stat.h>
48: #include <sys/time.h>
49:
50: #include <err.h>
51: #include <errno.h>
52: #include <fcntl.h>
53: #include <stdio.h>
54: #include <stdlib.h>
55: #include <string.h>
56: #include <locale.h>
57: #include <time.h>
1.5 pjanzen 58: #include <tzfile.h>
1.1 deraadt 59: #include <unistd.h>
60:
1.7 millert 61: int rw(char *, struct stat *, int);
62: void stime_arg1(char *, struct timeval *);
63: void stime_arg2(char *, int, struct timeval *);
64: void stime_file(char *, struct timeval *);
65: void usage(void);
1.1 deraadt 66:
67: int
1.10 ! deraadt 68: main(int argc, char *argv[])
1.1 deraadt 69: {
70: struct stat sb;
71: struct timeval tv[2];
72: int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
73: char *p;
74:
75: setlocale(LC_ALL, "");
76:
77: aflag = cflag = fflag = mflag = timeset = 0;
78: if (gettimeofday(&tv[0], NULL))
79: err(1, "gettimeofday");
80:
1.3 millert 81: while ((ch = getopt(argc, argv, "acfmr:t:")) != -1)
1.1 deraadt 82: switch(ch) {
83: case 'a':
84: aflag = 1;
85: break;
86: case 'c':
87: cflag = 1;
88: break;
89: case 'f':
90: fflag = 1;
91: break;
92: case 'm':
93: mflag = 1;
94: break;
95: case 'r':
96: timeset = 1;
97: stime_file(optarg, tv);
98: break;
99: case 't':
100: timeset = 1;
101: stime_arg1(optarg, tv);
102: break;
103: case '?':
104: default:
105: usage();
106: }
107: argc -= optind;
108: argv += optind;
109:
110: /* Default is both -a and -m. */
111: if (aflag == 0 && mflag == 0)
112: aflag = mflag = 1;
113:
114: /*
115: * If no -r or -t flag, at least two operands, the first of which
116: * is an 8 or 10 digit number, use the obsolete time specification.
117: */
118: if (!timeset && argc > 1) {
119: (void)strtol(argv[0], &p, 10);
120: len = p - argv[0];
121: if (*p == '\0' && (len == 8 || len == 10)) {
122: timeset = 1;
123: stime_arg2(*argv++, len == 10, tv);
124: }
125: }
126:
127: /* Otherwise use the current time of day. */
128: if (!timeset)
129: tv[1] = tv[0];
130:
131: if (*argv == NULL)
132: usage();
133:
134: for (rval = 0; *argv; ++argv) {
135: /* See if the file exists. */
1.4 pjanzen 136: if (stat(*argv, &sb)) {
1.1 deraadt 137: if (!cflag) {
138: /* Create the file. */
139: fd = open(*argv,
140: O_WRONLY | O_CREAT, DEFFILEMODE);
141: if (fd == -1 || fstat(fd, &sb) || close(fd)) {
142: rval = 1;
143: warn("%s", *argv);
144: continue;
145: }
146:
147: /* If using the current time, we're done. */
148: if (!timeset)
149: continue;
150: } else
151: continue;
1.4 pjanzen 152: }
1.1 deraadt 153:
154: if (!aflag)
155: TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
156: if (!mflag)
157: TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
158:
159: /* Try utimes(2). */
160: if (!utimes(*argv, tv))
161: continue;
162:
163: /* If the user specified a time, nothing else we can do. */
164: if (timeset) {
165: rval = 1;
166: warn("%s", *argv);
167: }
168:
169: /*
170: * System V and POSIX 1003.1 require that a NULL argument
171: * set the access/modification times to the current time.
172: * The permission checks are different, too, in that the
173: * ability to write the file is sufficient. Take a shot.
174: */
175: if (!utimes(*argv, NULL))
176: continue;
177:
178: /* Try reading/writing. */
179: if (rw(*argv, &sb, fflag))
180: rval = 1;
181: }
182: exit(rval);
183: }
184:
1.6 pjanzen 185: #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
1.1 deraadt 186:
187: void
1.10 ! deraadt 188: stime_arg1(char *arg, struct timeval *tvp)
1.1 deraadt 189: {
190: struct tm *t;
191: time_t tmptime;
192: int yearset;
193: char *p;
194: /* Start with the current time. */
195: tmptime = tvp[0].tv_sec;
196: if ((t = localtime(&tmptime)) == NULL)
197: err(1, "localtime");
198: /* [[CC]YY]MMDDhhmm[.SS] */
199: if ((p = strchr(arg, '.')) == NULL)
200: t->tm_sec = 0; /* Seconds defaults to 0. */
201: else {
202: if (strlen(p + 1) != 2)
203: goto terr;
204: *p++ = '\0';
205: t->tm_sec = ATOI2(p);
206: }
207:
208: yearset = 0;
209: switch(strlen(arg)) {
210: case 12: /* CCYYMMDDhhmm */
1.6 pjanzen 211: t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
1.1 deraadt 212: yearset = 1;
1.8 henning 213: /* FALLTHROUGH */
1.1 deraadt 214: case 10: /* YYMMDDhhmm */
215: if (yearset) {
216: yearset = ATOI2(arg);
217: t->tm_year += yearset;
218: } else {
219: yearset = ATOI2(arg);
220: if (yearset < 69)
1.5 pjanzen 221: t->tm_year = yearset + 2000 - TM_YEAR_BASE;
1.1 deraadt 222: else
1.5 pjanzen 223: t->tm_year = yearset + 1900 - TM_YEAR_BASE;
1.1 deraadt 224: }
225: /* FALLTHROUGH */
226: case 8: /* MMDDhhmm */
227: t->tm_mon = ATOI2(arg);
228: --t->tm_mon; /* Convert from 01-12 to 00-11 */
229: t->tm_mday = ATOI2(arg);
230: t->tm_hour = ATOI2(arg);
231: t->tm_min = ATOI2(arg);
232: break;
233: default:
234: goto terr;
235: }
236:
237: t->tm_isdst = -1; /* Figure out DST. */
238: tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
239: if (tvp[0].tv_sec == -1)
240: terr: errx(1,
241: "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
242:
243: tvp[0].tv_usec = tvp[1].tv_usec = 0;
244: }
245:
246: void
1.10 ! deraadt 247: stime_arg2(char *arg, int year, struct timeval *tvp)
1.1 deraadt 248: {
249: struct tm *t;
250: time_t tmptime;
251: /* Start with the current time. */
252: tmptime = tvp[0].tv_sec;
253: if ((t = localtime(&tmptime)) == NULL)
254: err(1, "localtime");
255:
1.4 pjanzen 256: t->tm_mon = ATOI2(arg); /* MMDDhhmm[YY] */
1.1 deraadt 257: --t->tm_mon; /* Convert from 01-12 to 00-11 */
258: t->tm_mday = ATOI2(arg);
259: t->tm_hour = ATOI2(arg);
260: t->tm_min = ATOI2(arg);
1.4 pjanzen 261: if (year) {
1.5 pjanzen 262: year = ATOI2(arg);
263: if (year < 69)
264: t->tm_year = year + 2000 - TM_YEAR_BASE;
265: else
266: t->tm_year = year + 1900 - TM_YEAR_BASE;
1.4 pjanzen 267: }
1.5 pjanzen 268: t->tm_sec = 0;
1.1 deraadt 269:
270: t->tm_isdst = -1; /* Figure out DST. */
271: tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
272: if (tvp[0].tv_sec == -1)
273: errx(1,
1.4 pjanzen 274: "out of range or illegal time specification: MMDDhhmm[YY]");
1.1 deraadt 275:
276: tvp[0].tv_usec = tvp[1].tv_usec = 0;
277: }
278:
279: void
1.10 ! deraadt 280: stime_file(char *fname, struct timeval *tvp)
1.1 deraadt 281: {
282: struct stat sb;
283:
284: if (stat(fname, &sb))
285: err(1, "%s", fname);
286: TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
287: TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
288: }
289:
290: int
1.10 ! deraadt 291: rw(char *fname, struct stat *sbp, int force)
1.1 deraadt 292: {
293: int fd, needed_chmod, rval;
294: u_char byte;
295:
296: /* Try regular files and directories. */
297: if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
298: warnx("%s: %s", fname, strerror(EFTYPE));
299: return (1);
300: }
301:
302: needed_chmod = rval = 0;
303: if ((fd = open(fname, O_RDWR, 0)) == -1) {
304: if (!force || chmod(fname, DEFFILEMODE))
305: goto err;
306: if ((fd = open(fname, O_RDWR, 0)) == -1)
307: goto err;
308: needed_chmod = 1;
309: }
310:
311: if (sbp->st_size != 0) {
312: if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
313: goto err;
314: if (lseek(fd, (off_t)0, SEEK_SET) == -1)
315: goto err;
316: if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
317: goto err;
318: } else {
319: if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
320: err: rval = 1;
321: warn("%s", fname);
322: } else if (ftruncate(fd, (off_t)0)) {
323: rval = 1;
324: warn("%s: file modified", fname);
325: }
326: }
327:
328: if (close(fd) && rval != 1) {
329: rval = 1;
330: warn("%s", fname);
331: }
332: if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
333: rval = 1;
334: warn("%s: permissions modified", fname);
335: }
336: return (rval);
337: }
338:
339: __dead void
1.10 ! deraadt 340: usage(void)
1.1 deraadt 341: {
342: (void)fprintf(stderr,
343: "usage: touch [-acfm] [-r file] [-t time] file ...\n");
344: exit(1);
345: }
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