1 /* 2 * Copyright (c) 1993 3 * The Regents of the University of California. 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 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #ifndef lint 45 static const char sccsid[] = "@(#)touch.c 8.1 (Berkeley) 6/6/93"; 46 #endif 47 48 #include <sys/types.h> 49 #include <sys/stat.h> 50 #include <sys/time.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 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); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 struct stat sb; 73 struct timeval tv[2]; 74 int (*stat_f)(const char *, struct stat *); 75 int (*utimes_f)(const char *, const struct timeval *); 76 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 77 char *p; 78 79 aflag = cflag = fflag = mflag = timeset = 0; 80 stat_f = stat; 81 utimes_f = utimes; 82 if (gettimeofday(&tv[0], NULL)) 83 err(1, "gettimeofday"); 84 85 while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1) 86 switch(ch) { 87 case 'a': 88 aflag = 1; 89 break; 90 case 'c': 91 cflag = 1; 92 break; 93 case 'f': 94 fflag = 1; 95 break; 96 case 'h': 97 cflag = 1; 98 stat_f = lstat; 99 utimes_f = lutimes; 100 break; 101 case 'm': 102 mflag = 1; 103 break; 104 case 'r': 105 timeset = 1; 106 stime_file(optarg, tv); 107 break; 108 case 't': 109 timeset = 1; 110 stime_arg1(optarg, tv); 111 break; 112 case '?': 113 default: 114 usage(); 115 } 116 argc -= optind; 117 argv += optind; 118 119 /* Default is both -a and -m. */ 120 if (aflag == 0 && mflag == 0) 121 aflag = mflag = 1; 122 123 /* 124 * If no -r or -t flag, at least two operands, the first of which 125 * is an 8 or 10 digit number, use the obsolete time specification. 126 */ 127 if (!timeset && argc > 1) { 128 (void)strtol(argv[0], &p, 10); 129 len = p - argv[0]; 130 if (*p == '\0' && (len == 8 || len == 10)) { 131 timeset = 1; 132 stime_arg2(*argv++, len == 10, tv); 133 } 134 } 135 136 /* Otherwise use the current time of day. */ 137 if (!timeset) 138 tv[1] = tv[0]; 139 140 if (*argv == NULL) 141 usage(); 142 143 for (rval = 0; *argv; ++argv) { 144 /* See if the file exists. */ 145 if (stat_f(*argv, &sb) != 0) { 146 if (!cflag) { 147 /* Create the file. */ 148 fd = open(*argv, 149 O_WRONLY | O_CREAT, DEFFILEMODE); 150 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 151 rval = 1; 152 warn("%s", *argv); 153 continue; 154 } 155 156 /* If using the current time, we're done. */ 157 if (!timeset) 158 continue; 159 } else 160 continue; 161 } 162 163 if (!aflag) 164 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 165 if (!mflag) 166 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 167 168 /* Try utimes(2). */ 169 if (!utimes_f(*argv, tv)) 170 continue; 171 172 /* If the user specified a time, nothing else we can do. */ 173 if (timeset) { 174 rval = 1; 175 warn("%s", *argv); 176 } 177 178 /* 179 * System V and POSIX 1003.1 require that a NULL argument 180 * set the access/modification times to the current time. 181 * The permission checks are different, too, in that the 182 * ability to write the file is sufficient. Take a shot. 183 */ 184 if (!utimes_f(*argv, NULL)) 185 continue; 186 187 /* Try reading/writing. */ 188 if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode) && 189 rw(*argv, &sb, fflag)) 190 rval = 1; 191 else 192 warn("%s", *argv); 193 } 194 exit(rval); 195 } 196 197 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 198 199 void 200 stime_arg1(arg, tvp) 201 char *arg; 202 struct timeval *tvp; 203 { 204 time_t now; 205 struct tm *t; 206 int yearset; 207 char *p; 208 /* Start with the current time. */ 209 now = tvp[0].tv_sec; 210 if ((t = localtime(&now)) == NULL) 211 err(1, "localtime"); 212 /* [[CC]YY]MMDDhhmm[.SS] */ 213 if ((p = strchr(arg, '.')) == NULL) 214 t->tm_sec = 0; /* Seconds defaults to 0. */ 215 else { 216 if (strlen(p + 1) != 2) 217 goto terr; 218 *p++ = '\0'; 219 t->tm_sec = ATOI2(p); 220 } 221 222 yearset = 0; 223 switch(strlen(arg)) { 224 case 12: /* CCYYMMDDhhmm */ 225 t->tm_year = ATOI2(arg); 226 t->tm_year *= 100; 227 yearset = 1; 228 /* FALLTHOUGH */ 229 case 10: /* YYMMDDhhmm */ 230 if (yearset) { 231 yearset = ATOI2(arg); 232 t->tm_year += yearset; 233 } else { 234 yearset = ATOI2(arg); 235 if (yearset < 69) 236 t->tm_year = yearset + 2000; 237 else 238 t->tm_year = yearset + 1900; 239 } 240 t->tm_year -= 1900; /* Convert to UNIX time. */ 241 /* FALLTHROUGH */ 242 case 8: /* MMDDhhmm */ 243 t->tm_mon = ATOI2(arg); 244 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 245 t->tm_mday = ATOI2(arg); 246 t->tm_hour = ATOI2(arg); 247 t->tm_min = ATOI2(arg); 248 break; 249 default: 250 goto terr; 251 } 252 253 t->tm_isdst = -1; /* Figure out DST. */ 254 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 255 if (tvp[0].tv_sec == -1) 256 terr: errx(1, 257 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 258 259 tvp[0].tv_usec = tvp[1].tv_usec = 0; 260 } 261 262 void 263 stime_arg2(arg, year, tvp) 264 char *arg; 265 int year; 266 struct timeval *tvp; 267 { 268 time_t now; 269 struct tm *t; 270 /* Start with the current time. */ 271 now = tvp[0].tv_sec; 272 if ((t = localtime(&now)) == NULL) 273 err(1, "localtime"); 274 275 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 276 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 277 t->tm_mday = ATOI2(arg); 278 t->tm_hour = ATOI2(arg); 279 t->tm_min = ATOI2(arg); 280 if (year) { 281 t->tm_year = ATOI2(arg); 282 if (t->tm_year < 39) /* support 2000-2038 not 1902-1969 */ 283 t->tm_year += 100; 284 } 285 286 t->tm_isdst = -1; /* Figure out DST. */ 287 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 288 if (tvp[0].tv_sec == -1) 289 errx(1, 290 "out of range or illegal time specification: MMDDhhmm[yy]"); 291 292 tvp[0].tv_usec = tvp[1].tv_usec = 0; 293 } 294 295 void 296 stime_file(fname, tvp) 297 char *fname; 298 struct timeval *tvp; 299 { 300 struct stat sb; 301 302 if (stat(fname, &sb)) 303 err(1, "%s", fname); 304 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 305 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 306 } 307 308 int 309 rw(fname, sbp, force) 310 char *fname; 311 struct stat *sbp; 312 int force; 313 { 314 int fd, needed_chmod, rval; 315 u_char byte; 316 317 /* Try regular files. */ 318 if (!S_ISREG(sbp->st_mode)) { 319 warnx("%s: %s", fname, strerror(EFTYPE)); 320 return (1); 321 } 322 323 needed_chmod = rval = 0; 324 if ((fd = open(fname, O_RDWR, 0)) == -1) { 325 if (!force || chmod(fname, DEFFILEMODE)) 326 goto err; 327 if ((fd = open(fname, O_RDWR, 0)) == -1) 328 goto err; 329 needed_chmod = 1; 330 } 331 332 if (sbp->st_size != 0) { 333 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 334 goto err; 335 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 336 goto err; 337 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 338 goto err; 339 } else { 340 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 341 err: rval = 1; 342 warn("%s", fname); 343 } else if (ftruncate(fd, (off_t)0)) { 344 rval = 1; 345 warn("%s: file modified", fname); 346 } 347 } 348 349 if (close(fd) && rval != 1) { 350 rval = 1; 351 warn("%s", fname); 352 } 353 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 354 rval = 1; 355 warn("%s: permissions modified", fname); 356 } 357 return (rval); 358 } 359 360 void 361 usage() 362 { 363 (void)fprintf(stderr, "usage: touch [-acfhm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...\n"); 364 exit(1); 365 } 366