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 * @(#) Copyright (c) 1993 The Regents of the University of California. All rights reserved. 34 * @(#)touch.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/usr.bin/touch/touch.c,v 1.11.2.2 2002/07/28 06:52:15 eric Exp $ 36 * $DragonFly: src/usr.bin/touch/touch.c,v 1.8 2004/09/14 00:13:36 drhodus Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <sys/time.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <time.h> 50 #include <unistd.h> 51 52 static int rw(const char *, const struct stat *, int); 53 static void stime_arg1(const char *, struct timeval *); 54 static void stime_arg2(const char *, int, struct timeval *); 55 static void stime_file(const char *, struct timeval *); 56 static void usage(void); 57 58 int 59 main(int argc, char **argv) 60 { 61 struct stat sb; 62 struct timeval tv[2]; 63 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 64 char *p; 65 66 aflag = cflag = fflag = mflag = timeset = 0; 67 if (gettimeofday(&tv[0], NULL) == -1) 68 err(1, "gettimeofday"); 69 70 while ((ch = getopt(argc, argv, "acfmr:t:")) != -1) 71 switch(ch) { 72 case 'a': 73 aflag = 1; 74 break; 75 case 'c': 76 cflag = 1; 77 break; 78 case 'f': 79 fflag = 1; 80 break; 81 case 'm': 82 mflag = 1; 83 break; 84 case 'r': 85 timeset = 1; 86 stime_file(optarg, tv); 87 break; 88 case 't': 89 timeset = 1; 90 stime_arg1(optarg, tv); 91 break; 92 default: 93 usage(); 94 } 95 argc -= optind; 96 argv += optind; 97 98 /* Default is both -a and -m. */ 99 if (aflag == 0 && mflag == 0) 100 aflag = mflag = 1; 101 102 /* 103 * If no -r or -t flag, at least two operands, the first of which 104 * is an 8 or 10 digit number, use the obsolete time specification. 105 */ 106 if (!timeset && argc > 1) { 107 strtol(argv[0], &p, 10); 108 len = p - argv[0]; 109 if (*p == '\0' && (len == 8 || len == 10)) { 110 timeset = 1; 111 stime_arg2(*argv++, len == 10, tv); 112 } 113 } 114 115 /* Otherwise use the current time of day. */ 116 if (!timeset) 117 tv[1] = tv[0]; 118 119 if (*argv == NULL) 120 usage(); 121 122 for (rval = 0; *argv; ++argv) { 123 /* See if the file exists. */ 124 if (stat(*argv, &sb)) { 125 if (!cflag) { 126 /* Create the file. */ 127 fd = open(*argv, 128 O_WRONLY | O_CREAT, DEFFILEMODE); 129 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 130 rval = 1; 131 warn("%s", *argv); 132 continue; 133 } 134 135 /* If using the current time, we're done. */ 136 if (!timeset) 137 continue; 138 } else 139 continue; 140 } 141 142 if (!aflag) 143 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 144 if (!mflag) 145 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 146 147 /* Try utimes(2). */ 148 if (!utimes(*argv, tv)) 149 continue; 150 151 /* If the user specified a time, nothing else we can do. */ 152 if (timeset) { 153 rval = 1; 154 warn("%s", *argv); 155 } 156 157 /* 158 * System V and POSIX 1003.1 require that a NULL argument 159 * set the access/modification times to the current time. 160 * The permission checks are different, too, in that the 161 * ability to write the file is sufficient. Take a shot. 162 */ 163 if (!utimes(*argv, NULL)) 164 continue; 165 166 /* Try reading/writing. */ 167 if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode) && 168 rw(*argv, &sb, fflag)) 169 rval = 1; 170 else 171 warn("%s", *argv); 172 } 173 exit(rval); 174 } 175 176 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 177 178 static void 179 stime_arg1(const char *arg, struct timeval *tvp) 180 { 181 time_t now; 182 struct tm *t; 183 int yearset; 184 char *p; 185 /* Start with the current time. */ 186 now = tvp[0].tv_sec; 187 if ((t = localtime(&now)) == NULL) 188 err(1, "localtime"); 189 /* [[CC]YY]MMDDhhmm[.SS] */ 190 if ((p = strchr(arg, '.')) == NULL) { 191 t->tm_sec = 0; /* Seconds defaults to 0. */ 192 } else { 193 if (strlen(p + 1) != 2) 194 goto failed; 195 *p++ = '\0'; 196 t->tm_sec = ATOI2(p); 197 } 198 199 yearset = 0; 200 switch(strlen(arg)) { 201 case 12: /* CCYYMMDDhhmm */ 202 t->tm_year = ATOI2(arg); 203 t->tm_year *= 100; 204 yearset = 1; 205 /* FALLTHROUGH */ 206 case 10: /* YYMMDDhhmm */ 207 if (yearset) { 208 yearset = ATOI2(arg); 209 t->tm_year += yearset; 210 } else { 211 yearset = ATOI2(arg); 212 if (yearset < 69) 213 t->tm_year = yearset + 2000; 214 else 215 t->tm_year = yearset + 1900; 216 } 217 t->tm_year -= 1900; /* Convert to UNIX time. */ 218 /* FALLTHROUGH */ 219 case 8: /* MMDDhhmm */ 220 t->tm_mon = ATOI2(arg); 221 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 222 t->tm_mday = ATOI2(arg); 223 t->tm_hour = ATOI2(arg); 224 t->tm_min = ATOI2(arg); 225 break; 226 default: 227 goto failed; 228 } 229 230 t->tm_isdst = -1; /* Figure out DST. */ 231 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 232 if (tvp[0].tv_sec == -1) 233 goto failed; 234 235 tvp[0].tv_usec = tvp[1].tv_usec = 0; 236 return; 237 238 failed: 239 errx(1, "out of range or illegal time " 240 "specification: [[CC]YY]MMDDhhmm[.SS]"); 241 } 242 243 static void 244 stime_arg2(const char *arg, int year, struct timeval *tvp) 245 { 246 time_t now; 247 struct tm *t; 248 /* Start with the current time. */ 249 now = tvp[0].tv_sec; 250 if ((t = localtime(&now)) == NULL) 251 err(1, "localtime"); 252 253 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 254 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 255 t->tm_mday = ATOI2(arg); 256 t->tm_hour = ATOI2(arg); 257 t->tm_min = ATOI2(arg); 258 if (year) { 259 t->tm_year = ATOI2(arg); 260 if (t->tm_year < 39) /* support 2000-2038 not 1902-1969 */ 261 t->tm_year += 100; 262 } 263 264 t->tm_isdst = -1; /* Figure out DST. */ 265 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 266 if (tvp[0].tv_sec == -1) 267 errx(1, "out of range or illegal time " 268 "specification: MMDDhhmm[yy]"); 269 270 tvp[0].tv_usec = tvp[1].tv_usec = 0; 271 } 272 273 static void 274 stime_file(const char *fname, struct timeval *tvp) 275 { 276 struct stat sb; 277 278 if (stat(fname, &sb)) 279 err(1, "%s", fname); 280 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 281 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 282 } 283 284 static int 285 rw(const char *fname, const struct stat *sbp, int force) 286 { 287 int fd, needed_chmod; 288 const char *warn_msg = NULL; 289 u_char byte; 290 291 /* Try regular files. */ 292 if (!S_ISREG(sbp->st_mode)) { 293 warnx("%s: %s", fname, strerror(EFTYPE)); 294 return (1); 295 } 296 297 needed_chmod = 0; 298 if ((fd = open(fname, O_RDWR, 0)) == -1) { 299 if (!force || chmod(fname, DEFFILEMODE)) 300 goto failed; 301 if ((fd = open(fname, O_RDWR, 0)) == -1) 302 goto failed; 303 needed_chmod = 1; 304 } 305 306 if (sbp->st_size != 0) { 307 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 308 goto failed; 309 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 310 goto failed; 311 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 312 goto failed; 313 } else { 314 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 315 goto failed; 316 if (ftruncate(fd, (off_t)0)) { 317 warn_msg = "%s: file modified"; 318 goto failed; 319 } 320 } 321 322 if (close(fd)) 323 goto failed; 324 if (needed_chmod && chmod(fname, sbp->st_mode)) { 325 warn_msg = "%s: permissions modified"; 326 goto failed; 327 } 328 return(0); 329 330 failed: 331 if (warn_msg != NULL) 332 warnx(warn_msg, fname); 333 else 334 warn("%s", fname); 335 return(1); 336 } 337 338 static void 339 usage(void) 340 { 341 fprintf(stderr, "usage: touch [-acfm] [-r file] " 342 "[-t [[CC]YY]MMDDhhmm[.SS]] file ...\n"); 343 exit(1); 344 } 345