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