touch.c revision 1.3
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 1.2 glass static char sccsid[] = "@(#)touch.c 5.5 (Berkeley) 3/7/93"; 42 1.1 cgd #endif /* not lint */ 43 1.1 cgd 44 1.1 cgd #include <sys/types.h> 45 1.1 cgd #include <sys/stat.h> 46 1.2 glass #include <sys/time.h> 47 1.2 glass 48 1.2 glass #include <err.h> 49 1.2 glass #include <errno.h> 50 1.2 glass #include <fcntl.h> 51 1.1 cgd #include <stdio.h> 52 1.2 glass #include <stdlib.h> 53 1.2 glass #include <string.h> 54 1.2 glass #include <time.h> 55 1.2 glass #include <unistd.h> 56 1.2 glass 57 1.2 glass int rw __P((char *, struct stat *, int)); 58 1.2 glass void stime_arg1 __P((char *, struct timeval *)); 59 1.2 glass void stime_arg2 __P((char *, int, struct timeval *)); 60 1.2 glass void stime_file __P((char *, struct timeval *)); 61 1.2 glass void usage __P((void)); 62 1.1 cgd 63 1.2 glass /*temporary we aren't 4.4 portability hack*/ 64 1.2 glass #define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp); 65 1.1 cgd 66 1.2 glass int 67 1.1 cgd main(argc, argv) 68 1.1 cgd int argc; 69 1.2 glass char *argv[]; 70 1.1 cgd { 71 1.2 glass struct stat sb; 72 1.2 glass struct timeval tv[2]; 73 1.2 glass int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 74 1.2 glass char *p; 75 1.2 glass 76 1.2 glass aflag = cflag = fflag = mflag = timeset = 0; 77 1.2 glass if (gettimeofday(&tv[0], NULL)) 78 1.2 glass err(1, "gettimeofday"); 79 1.2 glass 80 1.2 glass while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 81 1.2 glass switch(ch) { 82 1.2 glass case 'a': 83 1.2 glass aflag = 1; 84 1.2 glass break; 85 1.1 cgd case 'c': 86 1.2 glass cflag = 1; 87 1.1 cgd break; 88 1.1 cgd case 'f': 89 1.2 glass fflag = 1; 90 1.2 glass break; 91 1.2 glass case 'm': 92 1.2 glass mflag = 1; 93 1.2 glass break; 94 1.2 glass case 'r': 95 1.2 glass timeset = 1; 96 1.2 glass stime_file(optarg, tv); 97 1.1 cgd break; 98 1.2 glass case 't': 99 1.2 glass timeset = 1; 100 1.2 glass stime_arg1(optarg, tv); 101 1.2 glass break; 102 1.1 cgd case '?': 103 1.1 cgd default: 104 1.1 cgd usage(); 105 1.1 cgd } 106 1.2 glass argc -= optind; 107 1.2 glass argv += optind; 108 1.2 glass 109 1.2 glass /* Default is both -a and -m. */ 110 1.2 glass if (aflag == 0 && mflag == 0) 111 1.2 glass aflag = mflag = 1; 112 1.2 glass 113 1.2 glass /* 114 1.2 glass * If no -r or -t flag, at least two operands, the first of which 115 1.2 glass * is an 8 or 10 digit number, use the obsolete time specification. 116 1.2 glass */ 117 1.2 glass if (!timeset && argc > 1) { 118 1.2 glass (void)strtol(argv[0], &p, 10); 119 1.2 glass len = p - argv[0]; 120 1.2 glass if (*p == '\0' && (len == 8 || len == 10)) { 121 1.2 glass timeset = 1; 122 1.2 glass stime_arg2(argv[0], len == 10, tv); 123 1.2 glass } 124 1.2 glass } 125 1.2 glass 126 1.2 glass /* Otherwise use the current time of day. */ 127 1.2 glass if (!timeset) 128 1.2 glass tv[1] = tv[0]; 129 1.2 glass 130 1.2 glass if (*argv == NULL) 131 1.1 cgd usage(); 132 1.2 glass 133 1.2 glass for (rval = 0; *argv; ++argv) { 134 1.2 glass /* See if the file exists. */ 135 1.2 glass if (stat(*argv, &sb)) 136 1.2 glass if (!cflag) { 137 1.2 glass /* Create the file. */ 138 1.2 glass fd = open(*argv, 139 1.2 glass O_WRONLY | O_CREAT, DEFFILEMODE); 140 1.2 glass if (fd == -1 || fstat(fd, &sb) || close(fd)) { 141 1.2 glass rval = 1; 142 1.2 glass warn("%s", *argv); 143 1.2 glass continue; 144 1.2 glass } 145 1.2 glass 146 1.2 glass /* If using the current time, we're done. */ 147 1.2 glass if (!timeset) 148 1.2 glass continue; 149 1.2 glass } else 150 1.2 glass continue; 151 1.2 glass 152 1.2 glass if (!aflag) 153 1.2 glass /* TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);*/ 154 1.2 glass TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 155 1.2 glass if (!mflag) 156 1.2 glass /* TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);*/ 157 1.2 glass TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 158 1.2 glass 159 1.2 glass 160 1.2 glass /* Try utimes(2). */ 161 1.2 glass if (!utimes(*argv, tv)) 162 1.2 glass continue; 163 1.2 glass 164 1.2 glass /* If the user specified a time, nothing else we can do. */ 165 1.2 glass if (timeset) { 166 1.2 glass rval = 1; 167 1.2 glass warn("%s", *argv); 168 1.2 glass } 169 1.2 glass 170 1.2 glass /* 171 1.2 glass * System V and POSIX 1003.1 require that a NULL argument 172 1.2 glass * set the access/modification times to the current time. 173 1.2 glass * The permission checks are different, too, in that the 174 1.2 glass * ability to write the file is sufficient. Take a shot. 175 1.2 glass */ 176 1.2 glass if (!utimes(*argv, NULL)) 177 1.2 glass continue; 178 1.2 glass 179 1.2 glass /* Try reading/writing. */ 180 1.2 glass if (rw(*argv, &sb, fflag)) 181 1.2 glass rval = 1; 182 1.2 glass } 183 1.2 glass exit(rval); 184 1.1 cgd } 185 1.1 cgd 186 1.2 glass #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 187 1.2 glass 188 1.2 glass void 189 1.2 glass stime_arg1(arg, tvp) 190 1.2 glass char *arg; 191 1.2 glass struct timeval *tvp; 192 1.1 cgd { 193 1.2 glass struct tm *t; 194 1.2 glass int yearset; 195 1.2 glass char *p; 196 1.2 glass /* Start with the current time. */ 197 1.2 glass if ((t = localtime(&tvp[0].tv_sec)) == NULL) 198 1.2 glass err(1, "localtime"); 199 1.2 glass /* [[CC]YY]MMDDhhmm[.SS] */ 200 1.2 glass if ((p = strchr(arg, '.')) == NULL) 201 1.2 glass t->tm_sec = 0; /* Seconds defaults to 0. */ 202 1.2 glass else { 203 1.2 glass if (strlen(p + 1) != 2) 204 1.2 glass goto terr; 205 1.2 glass *p++ = '\0'; 206 1.2 glass t->tm_sec = ATOI2(p); 207 1.2 glass } 208 1.2 glass 209 1.2 glass yearset = 0; 210 1.2 glass switch(strlen(arg)) { 211 1.2 glass case 12: /* CCYYMMDDhhmm */ 212 1.2 glass t->tm_year = ATOI2(arg); 213 1.2 glass t->tm_year *= 1000; 214 1.2 glass yearset = 1; 215 1.2 glass /* FALLTHOUGH */ 216 1.2 glass case 10: /* YYMMDDhhmm */ 217 1.2 glass if (yearset) { 218 1.2 glass yearset = ATOI2(arg); 219 1.2 glass t->tm_year += yearset; 220 1.2 glass } else { 221 1.2 glass yearset = ATOI2(arg); 222 1.2 glass if (yearset < 69) 223 1.2 glass t->tm_year = yearset + 2000; 224 1.2 glass else 225 1.2 glass t->tm_year = yearset + 1900; 226 1.1 cgd } 227 1.2 glass t->tm_year -= 1900; /* Convert to UNIX time. */ 228 1.2 glass /* FALLTHROUGH */ 229 1.2 glass case 8: /* MMDDhhmm */ 230 1.2 glass t->tm_mon = ATOI2(arg); 231 1.2 glass --t->tm_mon; /* Convert from 01-12 to 00-11 */ 232 1.2 glass t->tm_mday = ATOI2(arg); 233 1.2 glass t->tm_hour = ATOI2(arg); 234 1.2 glass t->tm_min = ATOI2(arg); 235 1.2 glass break; 236 1.2 glass default: 237 1.2 glass goto terr; 238 1.1 cgd } 239 1.2 glass 240 1.2 glass t->tm_isdst = -1; /* Figure out DST. */ 241 1.2 glass tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 242 1.2 glass if (tvp[0].tv_sec == -1) 243 1.2 glass terr: errx(1, 244 1.2 glass "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 245 1.2 glass 246 1.2 glass tvp[0].tv_usec = tvp[1].tv_usec = 0; 247 1.2 glass } 248 1.2 glass 249 1.2 glass void 250 1.2 glass stime_arg2(arg, year, tvp) 251 1.2 glass char *arg; 252 1.2 glass int year; 253 1.2 glass struct timeval *tvp; 254 1.2 glass { 255 1.2 glass struct tm *t; 256 1.2 glass /* Start with the current time. */ 257 1.2 glass if ((t = localtime(&tvp[0].tv_sec)) == NULL) 258 1.2 glass err(1, "localtime"); 259 1.2 glass 260 1.2 glass t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 261 1.2 glass --t->tm_mon; /* Convert from 01-12 to 00-11 */ 262 1.2 glass t->tm_mday = ATOI2(arg); 263 1.2 glass t->tm_hour = ATOI2(arg); 264 1.2 glass t->tm_min = ATOI2(arg); 265 1.2 glass if (year) 266 1.2 glass t->tm_year = ATOI2(arg); 267 1.2 glass 268 1.2 glass t->tm_isdst = -1; /* Figure out DST. */ 269 1.2 glass tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 270 1.2 glass if (tvp[0].tv_sec == -1) 271 1.2 glass errx(1, 272 1.2 glass "out of range or illegal time specification: MMDDhhmm[yy]"); 273 1.2 glass 274 1.2 glass tvp[0].tv_usec = tvp[1].tv_usec = 0; 275 1.2 glass } 276 1.2 glass 277 1.2 glass void 278 1.2 glass stime_file(fname, tvp) 279 1.2 glass char *fname; 280 1.2 glass struct timeval *tvp; 281 1.2 glass { 282 1.2 glass struct stat sb; 283 1.2 glass 284 1.2 glass if (stat(fname, &sb)) 285 1.2 glass err(1, "%s", fname); 286 1.2 glass /* TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);*/ 287 1.2 glass TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 288 1.2 glass /* TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);*/ 289 1.2 glass TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 290 1.1 cgd } 291 1.1 cgd 292 1.2 glass int 293 1.2 glass rw(fname, sbp, force) 294 1.2 glass char *fname; 295 1.2 glass struct stat *sbp; 296 1.2 glass int force; 297 1.2 glass { 298 1.2 glass int fd, needed_chmod, rval; 299 1.2 glass u_char byte; 300 1.2 glass 301 1.2 glass /* Try regular files and directories. */ 302 1.2 glass if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 303 1.2 glass warnx("%s: %s", fname, strerror(EFTYPE)); 304 1.2 glass return (1); 305 1.2 glass } 306 1.2 glass 307 1.2 glass needed_chmod = rval = 0; 308 1.2 glass if ((fd = open(fname, O_RDWR, 0)) == -1) { 309 1.2 glass if (!force || chmod(fname, DEFFILEMODE)) 310 1.2 glass goto err; 311 1.2 glass if ((fd = open(fname, O_RDWR, 0)) == -1) 312 1.2 glass goto err; 313 1.2 glass needed_chmod = 1; 314 1.2 glass } 315 1.2 glass 316 1.2 glass if (sbp->st_size != 0) { 317 1.2 glass if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 318 1.2 glass goto err; 319 1.2 glass if (lseek(fd, (off_t)0, SEEK_SET) == -1) 320 1.2 glass goto err; 321 1.2 glass if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 322 1.2 glass goto err; 323 1.2 glass } else { 324 1.2 glass if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 325 1.2 glass err: rval = 1; 326 1.2 glass warn("%s", fname); 327 1.2 glass } else if (ftruncate(fd, (off_t)0)) { 328 1.2 glass rval = 1; 329 1.2 glass warn("%s: file modified", fname); 330 1.1 cgd } 331 1.2 glass } 332 1.2 glass 333 1.2 glass if (close(fd) && rval != 1) { 334 1.2 glass rval = 1; 335 1.2 glass warn("%s", fname); 336 1.2 glass } 337 1.2 glass if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 338 1.2 glass rval = 1; 339 1.2 glass warn("%s: permissions modified", fname); 340 1.2 glass } 341 1.2 glass return (rval); 342 1.1 cgd } 343 1.1 cgd 344 1.3 mycroft volatile void 345 1.1 cgd usage() 346 1.1 cgd { 347 1.2 glass (void)fprintf(stderr, 348 1.2 glass "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 349 1.1 cgd exit(1); 350 1.1 cgd } 351
Indexes created Tue Sep 30 17:09:57 GMT 2025