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 main(int, char *[]); 62 int rw(char *, struct stat *, int); 63 void stime_arg1(char *, struct timeval *); 64 void stime_arg2(char *, int, struct timeval *); 65 void stime_file(char *, struct timeval *); 66 void usage(void); 67 68 int 69 main(argc, argv) 70 int argc; 71 char *argv[]; 72 { 73 struct stat sb; 74 struct timeval tv[2]; 75 int (*stat_f)(const char *, struct stat *); 76 int (*utimes_f)(const char *, const struct timeval *); 77 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 78 char *p; 79 80 aflag = cflag = fflag = mflag = timeset = 0; 81 stat_f = stat; 82 utimes_f = utimes; 83 if (gettimeofday(&tv[0], NULL)) 84 err(1, "gettimeofday"); 85 86 while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1) 87 switch(ch) { 88 case 'a': 89 aflag = 1; 90 break; 91 case 'c': 92 cflag = 1; 93 break; 94 case 'f': 95 fflag = 1; 96 break; 97 case 'h': 98 cflag = 1; 99 stat_f = lstat; 100 utimes_f = lutimes; 101 break; 102 case 'm': 103 mflag = 1; 104 break; 105 case 'r': 106 timeset = 1; 107 stime_file(optarg, tv); 108 break; 109 case 't': 110 timeset = 1; 111 stime_arg1(optarg, tv); 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 argc -= optind; 118 argv += optind; 119 120 /* Default is both -a and -m. */ 121 if (aflag == 0 && mflag == 0) 122 aflag = mflag = 1; 123 124 /* 125 * If no -r or -t flag, at least two operands, the first of which 126 * is an 8 or 10 digit number, use the obsolete time specification. 127 */ 128 if (!timeset && argc > 1) { 129 (void)strtol(argv[0], &p, 10); 130 len = p - argv[0]; 131 if (*p == '\0' && (len == 8 || len == 10)) { 132 timeset = 1; 133 stime_arg2(*argv++, len == 10, tv); 134 } 135 } 136 137 /* Otherwise use the current time of day. */ 138 if (!timeset) 139 tv[1] = tv[0]; 140 141 if (*argv == NULL) 142 usage(); 143 144 for (rval = 0; *argv; ++argv) { 145 /* See if the file exists. */ 146 if (stat_f(*argv, &sb) != 0) { 147 if (!cflag) { 148 /* Create the file. */ 149 fd = open(*argv, 150 O_WRONLY | O_CREAT, DEFFILEMODE); 151 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 152 rval = 1; 153 warn("%s", *argv); 154 continue; 155 } 156 157 /* If using the current time, we're done. */ 158 if (!timeset) 159 continue; 160 } else 161 continue; 162 } 163 164 if (!aflag) 165 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 166 if (!mflag) 167 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 168 169 /* Try utimes(2). */ 170 if (!utimes_f(*argv, tv)) 171 continue; 172 173 /* If the user specified a time, nothing else we can do. */ 174 if (timeset) { 175 rval = 1; 176 warn("%s", *argv); 177 } 178 179 /* 180 * System V and POSIX 1003.1 require that a NULL argument 181 * set the access/modification times to the current time. 182 * The permission checks are different, too, in that the 183 * ability to write the file is sufficient. Take a shot. 184 */ 185 if (!utimes_f(*argv, NULL)) 186 continue; 187 188 /* Try reading/writing. */ 189 if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode) && 190 rw(*argv, &sb, fflag)) 191 rval = 1; 192 else 193 warn("%s", *argv); 194 } 195 exit(rval); 196 } 197 198 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 199 200 void 201 stime_arg1(arg, tvp) 202 char *arg; 203 struct timeval *tvp; 204 { 205 time_t now; 206 struct tm *t; 207 int yearset; 208 char *p; 209 /* Start with the current time. */ 210 now = tvp[0].tv_sec; 211 if ((t = localtime(&now)) == NULL) 212 err(1, "localtime"); 213 /* [[CC]YY]MMDDhhmm[.SS] */ 214 if ((p = strchr(arg, '.')) == NULL) 215 t->tm_sec = 0; /* Seconds defaults to 0. */ 216 else { 217 if (strlen(p + 1) != 2) 218 goto terr; 219 *p++ = '\0'; 220 t->tm_sec = ATOI2(p); 221 } 222 223 yearset = 0; 224 switch(strlen(arg)) { 225 case 12: /* CCYYMMDDhhmm */ 226 t->tm_year = ATOI2(arg); 227 t->tm_year *= 100; 228 yearset = 1; 229 /* FALLTHOUGH */ 230 case 10: /* YYMMDDhhmm */ 231 if (yearset) { 232 yearset = ATOI2(arg); 233 t->tm_year += yearset; 234 } else { 235 yearset = ATOI2(arg); 236 if (yearset < 69) 237 t->tm_year = yearset + 2000; 238 else 239 t->tm_year = yearset + 1900; 240 } 241 t->tm_year -= 1900; /* Convert to UNIX time. */ 242 /* FALLTHROUGH */ 243 case 8: /* MMDDhhmm */ 244 t->tm_mon = ATOI2(arg); 245 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 246 t->tm_mday = ATOI2(arg); 247 t->tm_hour = ATOI2(arg); 248 t->tm_min = ATOI2(arg); 249 break; 250 default: 251 goto terr; 252 } 253 254 t->tm_isdst = -1; /* Figure out DST. */ 255 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 256 if (tvp[0].tv_sec == -1) 257 terr: errx(1, 258 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 259 260 tvp[0].tv_usec = tvp[1].tv_usec = 0; 261 } 262 263 void 264 stime_arg2(arg, year, tvp) 265 char *arg; 266 int year; 267 struct timeval *tvp; 268 { 269 time_t now; 270 struct tm *t; 271 /* Start with the current time. */ 272 now = tvp[0].tv_sec; 273 if ((t = localtime(&now)) == NULL) 274 err(1, "localtime"); 275 276 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 277 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 278 t->tm_mday = ATOI2(arg); 279 t->tm_hour = ATOI2(arg); 280 t->tm_min = ATOI2(arg); 281 if (year) { 282 t->tm_year = ATOI2(arg); 283 if (t->tm_year < 39) /* support 2000-2038 not 1902-1969 */ 284 t->tm_year += 100; 285 } 286 287 t->tm_isdst = -1; /* Figure out DST. */ 288 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 289 if (tvp[0].tv_sec == -1) 290 errx(1, 291 "out of range or illegal time specification: MMDDhhmm[yy]"); 292 293 tvp[0].tv_usec = tvp[1].tv_usec = 0; 294 } 295 296 void 297 stime_file(fname, tvp) 298 char *fname; 299 struct timeval *tvp; 300 { 301 struct stat sb; 302 303 if (stat(fname, &sb)) 304 err(1, "%s", fname); 305 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 306 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 307 } 308 309 int 310 rw(fname, sbp, force) 311 char *fname; 312 struct stat *sbp; 313 int force; 314 { 315 int fd, needed_chmod, rval; 316 u_char byte; 317 318 /* Try regular files. */ 319 if (!S_ISREG(sbp->st_mode)) { 320 warnx("%s: %s", fname, strerror(EFTYPE)); 321 return (1); 322 } 323 324 needed_chmod = rval = 0; 325 if ((fd = open(fname, O_RDWR, 0)) == -1) { 326 if (!force || chmod(fname, DEFFILEMODE)) 327 goto err; 328 if ((fd = open(fname, O_RDWR, 0)) == -1) 329 goto err; 330 needed_chmod = 1; 331 } 332 333 if (sbp->st_size != 0) { 334 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 335 goto err; 336 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 337 goto err; 338 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 339 goto err; 340 } else { 341 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 342 err: rval = 1; 343 warn("%s", fname); 344 } else if (ftruncate(fd, (off_t)0)) { 345 rval = 1; 346 warn("%s: file modified", fname); 347 } 348 } 349 350 if (close(fd) && rval != 1) { 351 rval = 1; 352 warn("%s", fname); 353 } 354 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 355 rval = 1; 356 warn("%s: permissions modified", fname); 357 } 358 return (rval); 359 } 360 361 void 362 usage() 363 { 364 (void)fprintf(stderr, "usage: touch [-acfhm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...\n"); 365 exit(1); 366 } 367