touch.c revision 1.6
1 1.1 cgd /* 2 1.2 glass * Copyright (c) 1993 Regents of the University of California. 3 1.1 cgd * All rights reserved. 4 1.1 cgd * 5 1.1 cgd * Redistribution and use in source and binary forms, with or without 6 1.1 cgd * modification, are permitted provided that the following conditions 7 1.1 cgd * are met: 8 1.1 cgd * 1. Redistributions of source code must retain the above copyright 9 1.1 cgd * notice, this list of conditions and the following disclaimer. 10 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 11 1.1 cgd * notice, this list of conditions and the following disclaimer in the 12 1.1 cgd * documentation and/or other materials provided with the distribution. 13 1.1 cgd * 3. All advertising materials mentioning features or use of this software 14 1.1 cgd * must display the following acknowledgement: 15 1.1 cgd * This product includes software developed by the University of 16 1.1 cgd * California, Berkeley and its contributors. 17 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 18 1.1 cgd * may be used to endorse or promote products derived from this software 19 1.1 cgd * without specific prior written permission. 20 1.1 cgd * 21 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.1 cgd * SUCH DAMAGE. 32 1.1 cgd */ 33 1.1 cgd 34 1.1 cgd #ifndef lint 35 1.1 cgd char copyright[] = 36 1.2 glass "@(#) Copyright (c) 1993 Regents of the University of California.\n\ 37 1.1 cgd All rights reserved.\n"; 38 1.1 cgd #endif /* not lint */ 39 1.1 cgd 40 1.1 cgd #ifndef lint 41 1.5 mycroft /*static char sccsid[] = "from: @(#)touch.c 5.5 (Berkeley) 3/7/93";*/ 42 1.6 mycroft static char rcsid[] = "$Id: touch.c,v 1.6 1993/08/07 04:50:32 mycroft Exp $"; 43 1.1 cgd #endif /* not lint */ 44 1.1 cgd 45 1.1 cgd #include <sys/types.h> 46 1.1 cgd #include <sys/stat.h> 47 1.2 glass #include <sys/time.h> 48 1.2 glass 49 1.2 glass #include <err.h> 50 1.2 glass #include <errno.h> 51 1.2 glass #include <fcntl.h> 52 1.1 cgd #include <stdio.h> 53 1.2 glass #include <stdlib.h> 54 1.2 glass #include <string.h> 55 1.2 glass #include <time.h> 56 1.2 glass #include <unistd.h> 57 1.2 glass 58 1.2 glass int rw __P((char *, struct stat *, int)); 59 1.2 glass void stime_arg1 __P((char *, struct timeval *)); 60 1.2 glass void stime_arg2 __P((char *, int, struct timeval *)); 61 1.2 glass void stime_file __P((char *, struct timeval *)); 62 1.2 glass void usage __P((void)); 63 1.1 cgd 64 1.6 mycroft #ifndef notyet 65 1.2 glass #define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp); 66 1.6 mycroft #endif 67 1.1 cgd 68 1.2 glass int 69 1.1 cgd main(argc, argv) 70 1.1 cgd int argc; 71 1.2 glass char *argv[]; 72 1.1 cgd { 73 1.2 glass struct stat sb; 74 1.2 glass struct timeval tv[2]; 75 1.2 glass int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 76 1.2 glass char *p; 77 1.2 glass 78 1.2 glass aflag = cflag = fflag = mflag = timeset = 0; 79 1.2 glass if (gettimeofday(&tv[0], NULL)) 80 1.2 glass err(1, "gettimeofday"); 81 1.2 glass 82 1.2 glass while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 83 1.2 glass switch(ch) { 84 1.2 glass case 'a': 85 1.2 glass aflag = 1; 86 1.2 glass break; 87 1.1 cgd case 'c': 88 1.2 glass cflag = 1; 89 1.1 cgd break; 90 1.1 cgd case 'f': 91 1.2 glass fflag = 1; 92 1.2 glass break; 93 1.2 glass case 'm': 94 1.2 glass mflag = 1; 95 1.2 glass break; 96 1.2 glass case 'r': 97 1.2 glass timeset = 1; 98 1.2 glass stime_file(optarg, tv); 99 1.1 cgd break; 100 1.2 glass case 't': 101 1.2 glass timeset = 1; 102 1.2 glass stime_arg1(optarg, tv); 103 1.2 glass break; 104 1.1 cgd case '?': 105 1.1 cgd default: 106 1.1 cgd usage(); 107 1.1 cgd } 108 1.2 glass argc -= optind; 109 1.2 glass argv += optind; 110 1.2 glass 111 1.2 glass /* Default is both -a and -m. */ 112 1.2 glass if (aflag == 0 && mflag == 0) 113 1.2 glass aflag = mflag = 1; 114 1.2 glass 115 1.2 glass /* 116 1.2 glass * If no -r or -t flag, at least two operands, the first of which 117 1.2 glass * is an 8 or 10 digit number, use the obsolete time specification. 118 1.2 glass */ 119 1.2 glass if (!timeset && argc > 1) { 120 1.2 glass (void)strtol(argv[0], &p, 10); 121 1.2 glass len = p - argv[0]; 122 1.2 glass if (*p == '\0' && (len == 8 || len == 10)) { 123 1.2 glass timeset = 1; 124 1.2 glass stime_arg2(argv[0], len == 10, tv); 125 1.4 glass argv++; 126 1.2 glass } 127 1.2 glass } 128 1.2 glass 129 1.2 glass /* Otherwise use the current time of day. */ 130 1.2 glass if (!timeset) 131 1.2 glass tv[1] = tv[0]; 132 1.2 glass 133 1.2 glass if (*argv == NULL) 134 1.1 cgd usage(); 135 1.2 glass 136 1.2 glass for (rval = 0; *argv; ++argv) { 137 1.2 glass /* See if the file exists. */ 138 1.2 glass if (stat(*argv, &sb)) 139 1.2 glass if (!cflag) { 140 1.2 glass /* Create the file. */ 141 1.2 glass fd = open(*argv, 142 1.2 glass O_WRONLY | O_CREAT, DEFFILEMODE); 143 1.2 glass if (fd == -1 || fstat(fd, &sb) || close(fd)) { 144 1.2 glass rval = 1; 145 1.2 glass warn("%s", *argv); 146 1.2 glass continue; 147 1.2 glass } 148 1.2 glass 149 1.2 glass /* If using the current time, we're done. */ 150 1.2 glass if (!timeset) 151 1.2 glass continue; 152 1.2 glass } else 153 1.2 glass continue; 154 1.2 glass 155 1.2 glass if (!aflag) 156 1.6 mycroft #ifdef notyet 157 1.6 mycroft TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 158 1.6 mycroft #else 159 1.2 glass TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 160 1.6 mycroft #endif 161 1.2 glass if (!mflag) 162 1.6 mycroft #ifdef notyet 163 1.6 mycroft TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 164 1.6 mycroft #else 165 1.2 glass TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 166 1.6 mycroft #endif 167 1.2 glass 168 1.2 glass 169 1.2 glass /* Try utimes(2). */ 170 1.2 glass if (!utimes(*argv, tv)) 171 1.2 glass continue; 172 1.2 glass 173 1.2 glass /* If the user specified a time, nothing else we can do. */ 174 1.2 glass if (timeset) { 175 1.2 glass rval = 1; 176 1.2 glass warn("%s", *argv); 177 1.2 glass } 178 1.2 glass 179 1.2 glass /* 180 1.2 glass * System V and POSIX 1003.1 require that a NULL argument 181 1.2 glass * set the access/modification times to the current time. 182 1.2 glass * The permission checks are different, too, in that the 183 1.2 glass * ability to write the file is sufficient. Take a shot. 184 1.2 glass */ 185 1.2 glass if (!utimes(*argv, NULL)) 186 1.2 glass continue; 187 1.2 glass 188 1.2 glass /* Try reading/writing. */ 189 1.2 glass if (rw(*argv, &sb, fflag)) 190 1.2 glass rval = 1; 191 1.2 glass } 192 1.2 glass exit(rval); 193 1.1 cgd } 194 1.1 cgd 195 1.2 glass #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 196 1.2 glass 197 1.2 glass void 198 1.2 glass stime_arg1(arg, tvp) 199 1.2 glass char *arg; 200 1.2 glass struct timeval *tvp; 201 1.1 cgd { 202 1.2 glass struct tm *t; 203 1.2 glass int yearset; 204 1.2 glass char *p; 205 1.2 glass /* Start with the current time. */ 206 1.2 glass if ((t = localtime(&tvp[0].tv_sec)) == NULL) 207 1.2 glass err(1, "localtime"); 208 1.2 glass /* [[CC]YY]MMDDhhmm[.SS] */ 209 1.2 glass if ((p = strchr(arg, '.')) == NULL) 210 1.2 glass t->tm_sec = 0; /* Seconds defaults to 0. */ 211 1.2 glass else { 212 1.2 glass if (strlen(p + 1) != 2) 213 1.2 glass goto terr; 214 1.2 glass *p++ = '\0'; 215 1.2 glass t->tm_sec = ATOI2(p); 216 1.2 glass } 217 1.2 glass 218 1.2 glass yearset = 0; 219 1.2 glass switch(strlen(arg)) { 220 1.2 glass case 12: /* CCYYMMDDhhmm */ 221 1.2 glass t->tm_year = ATOI2(arg); 222 1.2 glass t->tm_year *= 1000; 223 1.2 glass yearset = 1; 224 1.2 glass /* FALLTHOUGH */ 225 1.2 glass case 10: /* YYMMDDhhmm */ 226 1.2 glass if (yearset) { 227 1.2 glass yearset = ATOI2(arg); 228 1.2 glass t->tm_year += yearset; 229 1.2 glass } else { 230 1.2 glass yearset = ATOI2(arg); 231 1.2 glass if (yearset < 69) 232 1.2 glass t->tm_year = yearset + 2000; 233 1.2 glass else 234 1.2 glass t->tm_year = yearset + 1900; 235 1.1 cgd } 236 1.2 glass t->tm_year -= 1900; /* Convert to UNIX time. */ 237 1.2 glass /* FALLTHROUGH */ 238 1.2 glass case 8: /* MMDDhhmm */ 239 1.2 glass t->tm_mon = ATOI2(arg); 240 1.2 glass --t->tm_mon; /* Convert from 01-12 to 00-11 */ 241 1.2 glass t->tm_mday = ATOI2(arg); 242 1.2 glass t->tm_hour = ATOI2(arg); 243 1.2 glass t->tm_min = ATOI2(arg); 244 1.2 glass break; 245 1.2 glass default: 246 1.2 glass goto terr; 247 1.1 cgd } 248 1.2 glass 249 1.2 glass t->tm_isdst = -1; /* Figure out DST. */ 250 1.2 glass tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 251 1.2 glass if (tvp[0].tv_sec == -1) 252 1.2 glass terr: errx(1, 253 1.2 glass "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 254 1.2 glass 255 1.2 glass tvp[0].tv_usec = tvp[1].tv_usec = 0; 256 1.2 glass } 257 1.2 glass 258 1.2 glass void 259 1.2 glass stime_arg2(arg, year, tvp) 260 1.2 glass char *arg; 261 1.2 glass int year; 262 1.2 glass struct timeval *tvp; 263 1.2 glass { 264 1.2 glass struct tm *t; 265 1.2 glass /* Start with the current time. */ 266 1.2 glass if ((t = localtime(&tvp[0].tv_sec)) == NULL) 267 1.2 glass err(1, "localtime"); 268 1.2 glass 269 1.2 glass t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 270 1.2 glass --t->tm_mon; /* Convert from 01-12 to 00-11 */ 271 1.2 glass t->tm_mday = ATOI2(arg); 272 1.2 glass t->tm_hour = ATOI2(arg); 273 1.2 glass t->tm_min = ATOI2(arg); 274 1.2 glass if (year) 275 1.2 glass t->tm_year = ATOI2(arg); 276 1.2 glass 277 1.2 glass t->tm_isdst = -1; /* Figure out DST. */ 278 1.2 glass tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 279 1.2 glass if (tvp[0].tv_sec == -1) 280 1.2 glass errx(1, 281 1.2 glass "out of range or illegal time specification: MMDDhhmm[yy]"); 282 1.2 glass 283 1.2 glass tvp[0].tv_usec = tvp[1].tv_usec = 0; 284 1.2 glass } 285 1.2 glass 286 1.2 glass void 287 1.2 glass stime_file(fname, tvp) 288 1.2 glass char *fname; 289 1.2 glass struct timeval *tvp; 290 1.2 glass { 291 1.2 glass struct stat sb; 292 1.2 glass 293 1.2 glass if (stat(fname, &sb)) 294 1.2 glass err(1, "%s", fname); 295 1.6 mycroft #ifdef notyet 296 1.6 mycroft TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 297 1.6 mycroft #else 298 1.2 glass TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 299 1.6 mycroft #endif 300 1.6 mycroft #ifdef notyet 301 1.6 mycroft TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 302 1.6 mycroft #else 303 1.2 glass TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 304 1.6 mycroft #endif 305 1.1 cgd } 306 1.1 cgd 307 1.2 glass int 308 1.2 glass rw(fname, sbp, force) 309 1.2 glass char *fname; 310 1.2 glass struct stat *sbp; 311 1.2 glass int force; 312 1.2 glass { 313 1.2 glass int fd, needed_chmod, rval; 314 1.2 glass u_char byte; 315 1.2 glass 316 1.2 glass /* Try regular files and directories. */ 317 1.2 glass if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 318 1.2 glass warnx("%s: %s", fname, strerror(EFTYPE)); 319 1.2 glass return (1); 320 1.2 glass } 321 1.2 glass 322 1.2 glass needed_chmod = rval = 0; 323 1.2 glass if ((fd = open(fname, O_RDWR, 0)) == -1) { 324 1.2 glass if (!force || chmod(fname, DEFFILEMODE)) 325 1.2 glass goto err; 326 1.2 glass if ((fd = open(fname, O_RDWR, 0)) == -1) 327 1.2 glass goto err; 328 1.2 glass needed_chmod = 1; 329 1.2 glass } 330 1.2 glass 331 1.2 glass if (sbp->st_size != 0) { 332 1.2 glass if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 333 1.2 glass goto err; 334 1.2 glass if (lseek(fd, (off_t)0, SEEK_SET) == -1) 335 1.2 glass goto err; 336 1.2 glass if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 337 1.2 glass goto err; 338 1.2 glass } else { 339 1.2 glass if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 340 1.2 glass err: rval = 1; 341 1.2 glass warn("%s", fname); 342 1.2 glass } else if (ftruncate(fd, (off_t)0)) { 343 1.2 glass rval = 1; 344 1.2 glass warn("%s: file modified", fname); 345 1.1 cgd } 346 1.2 glass } 347 1.2 glass 348 1.2 glass if (close(fd) && rval != 1) { 349 1.2 glass rval = 1; 350 1.2 glass warn("%s", fname); 351 1.2 glass } 352 1.2 glass if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 353 1.2 glass rval = 1; 354 1.2 glass warn("%s: permissions modified", fname); 355 1.2 glass } 356 1.2 glass return (rval); 357 1.1 cgd } 358 1.1 cgd 359 1.3 mycroft volatile void 360 1.1 cgd usage() 361 1.1 cgd { 362 1.2 glass (void)fprintf(stderr, 363 1.2 glass "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 364 1.1 cgd exit(1); 365 1.1 cgd } 366
Indexes created Tue Sep 30 17:09:57 GMT 2025