touch.c revision 1.7
1 /* 2 * Copyright (c) 1993 Regents of the University of California. 3 * 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 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1993 Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)touch.c 5.5 (Berkeley) 3/7/93";*/ 42 static char rcsid[] = "$Id: touch.c,v 1.7 1993/09/16 21:44:35 cgd Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <time.h> 56 #include <unistd.h> 57 58 int rw __P((char *, struct stat *, int)); 59 void stime_arg1 __P((char *, struct timeval *)); 60 void stime_arg2 __P((char *, int, struct timeval *)); 61 void stime_file __P((char *, struct timeval *)); 62 void usage __P((void)); 63 64 #ifndef notyet 65 #define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp); 66 #endif 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 aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 76 char *p; 77 78 aflag = cflag = fflag = mflag = timeset = 0; 79 if (gettimeofday(&tv[0], NULL)) 80 err(1, "gettimeofday"); 81 82 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 83 switch(ch) { 84 case 'a': 85 aflag = 1; 86 break; 87 case 'c': 88 cflag = 1; 89 break; 90 case 'f': 91 fflag = 1; 92 break; 93 case 'm': 94 mflag = 1; 95 break; 96 case 'r': 97 timeset = 1; 98 stime_file(optarg, tv); 99 break; 100 case 't': 101 timeset = 1; 102 stime_arg1(optarg, tv); 103 break; 104 case '?': 105 default: 106 usage(); 107 } 108 argc -= optind; 109 argv += optind; 110 111 /* Default is both -a and -m. */ 112 if (aflag == 0 && mflag == 0) 113 aflag = mflag = 1; 114 115 /* 116 * If no -r or -t flag, at least two operands, the first of which 117 * is an 8 or 10 digit number, use the obsolete time specification. 118 */ 119 if (!timeset && argc > 1) { 120 (void)strtol(argv[0], &p, 10); 121 len = p - argv[0]; 122 if (*p == '\0' && (len == 8 || len == 10)) { 123 timeset = 1; 124 stime_arg2(argv[0], len == 10, tv); 125 argv++; 126 } 127 } 128 129 /* Otherwise use the current time of day. */ 130 if (!timeset) 131 tv[1] = tv[0]; 132 133 if (*argv == NULL) 134 usage(); 135 136 for (rval = 0; *argv; ++argv) { 137 /* See if the file exists. */ 138 if (stat(*argv, &sb)) 139 if (!cflag) { 140 /* Create the file. */ 141 fd = open(*argv, 142 O_WRONLY | O_CREAT, DEFFILEMODE); 143 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 144 rval = 1; 145 warn("%s", *argv); 146 continue; 147 } 148 149 /* If using the current time, we're done. */ 150 if (!timeset) 151 continue; 152 } else 153 continue; 154 155 if (!aflag) 156 #ifdef notyet 157 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 158 #else 159 TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 160 #endif 161 if (!mflag) 162 #ifdef notyet 163 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 164 #else 165 TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 166 #endif 167 168 169 /* Try utimes(2). */ 170 if (!utimes(*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(*argv, NULL)) 186 continue; 187 188 /* Try reading/writing. */ 189 if (rw(*argv, &sb, fflag)) 190 rval = 1; 191 } 192 exit(rval); 193 } 194 195 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 196 197 void 198 stime_arg1(arg, tvp) 199 char *arg; 200 struct timeval *tvp; 201 { 202 struct tm *t; 203 int yearset; 204 char *p; 205 /* Start with the current time. */ 206 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 207 err(1, "localtime"); 208 /* [[CC]YY]MMDDhhmm[.SS] */ 209 if ((p = strchr(arg, '.')) == NULL) 210 t->tm_sec = 0; /* Seconds defaults to 0. */ 211 else { 212 if (strlen(p + 1) != 2) 213 goto terr; 214 *p++ = '\0'; 215 t->tm_sec = ATOI2(p); 216 } 217 218 yearset = 0; 219 switch(strlen(arg)) { 220 case 12: /* CCYYMMDDhhmm */ 221 t->tm_year = ATOI2(arg); 222 t->tm_year *= 100; 223 yearset = 1; 224 /* FALLTHOUGH */ 225 case 10: /* YYMMDDhhmm */ 226 if (yearset) { 227 yearset = ATOI2(arg); 228 t->tm_year += yearset; 229 } else { 230 yearset = ATOI2(arg); 231 if (yearset < 69) 232 t->tm_year = yearset + 2000; 233 else 234 t->tm_year = yearset + 1900; 235 } 236 t->tm_year -= 1900; /* Convert to UNIX time. */ 237 /* FALLTHROUGH */ 238 case 8: /* MMDDhhmm */ 239 t->tm_mon = ATOI2(arg); 240 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 241 t->tm_mday = ATOI2(arg); 242 t->tm_hour = ATOI2(arg); 243 t->tm_min = ATOI2(arg); 244 break; 245 default: 246 goto terr; 247 } 248 249 t->tm_isdst = -1; /* Figure out DST. */ 250 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 251 if (tvp[0].tv_sec == -1) 252 terr: errx(1, 253 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 254 255 tvp[0].tv_usec = tvp[1].tv_usec = 0; 256 } 257 258 void 259 stime_arg2(arg, year, tvp) 260 char *arg; 261 int year; 262 struct timeval *tvp; 263 { 264 struct tm *t; 265 /* Start with the current time. */ 266 if ((t = localtime(&tvp[0].tv_sec)) == 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); 276 277 t->tm_isdst = -1; /* Figure out DST. */ 278 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 279 if (tvp[0].tv_sec == -1) 280 errx(1, 281 "out of range or illegal time specification: MMDDhhmm[yy]"); 282 283 tvp[0].tv_usec = tvp[1].tv_usec = 0; 284 } 285 286 void 287 stime_file(fname, tvp) 288 char *fname; 289 struct timeval *tvp; 290 { 291 struct stat sb; 292 293 if (stat(fname, &sb)) 294 err(1, "%s", fname); 295 #ifdef notyet 296 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 297 #else 298 TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 299 #endif 300 #ifdef notyet 301 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 302 #else 303 TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 304 #endif 305 } 306 307 int 308 rw(fname, sbp, force) 309 char *fname; 310 struct stat *sbp; 311 int force; 312 { 313 int fd, needed_chmod, rval; 314 u_char byte; 315 316 /* Try regular files and directories. */ 317 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 318 warnx("%s: %s", fname, strerror(EFTYPE)); 319 return (1); 320 } 321 322 needed_chmod = rval = 0; 323 if ((fd = open(fname, O_RDWR, 0)) == -1) { 324 if (!force || chmod(fname, DEFFILEMODE)) 325 goto err; 326 if ((fd = open(fname, O_RDWR, 0)) == -1) 327 goto err; 328 needed_chmod = 1; 329 } 330 331 if (sbp->st_size != 0) { 332 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 333 goto err; 334 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 335 goto err; 336 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 337 goto err; 338 } else { 339 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 340 err: rval = 1; 341 warn("%s", fname); 342 } else if (ftruncate(fd, (off_t)0)) { 343 rval = 1; 344 warn("%s: file modified", fname); 345 } 346 } 347 348 if (close(fd) && rval != 1) { 349 rval = 1; 350 warn("%s", fname); 351 } 352 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 353 rval = 1; 354 warn("%s: permissions modified", fname); 355 } 356 return (rval); 357 } 358 359 volatile void 360 usage() 361 { 362 (void)fprintf(stderr, 363 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 364 exit(1); 365 } 366
Indexes created Tue Sep 30 17:09:57 GMT 2025