touch.c revision 1.4
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[] = "@(#)touch.c 5.5 (Berkeley) 3/7/93"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 #include <sys/time.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <time.h> 55 #include <unistd.h> 56 57 int rw __P((char *, struct stat *, int)); 58 void stime_arg1 __P((char *, struct timeval *)); 59 void stime_arg2 __P((char *, int, struct timeval *)); 60 void stime_file __P((char *, struct timeval *)); 61 void usage __P((void)); 62 63 /*temporary we aren't 4.4 portability hack*/ 64 #define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp); 65 66 int 67 main(argc, argv) 68 int argc; 69 char *argv[]; 70 { 71 struct stat sb; 72 struct timeval tv[2]; 73 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 74 char *p; 75 76 aflag = cflag = fflag = mflag = timeset = 0; 77 if (gettimeofday(&tv[0], NULL)) 78 err(1, "gettimeofday"); 79 80 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 81 switch(ch) { 82 case 'a': 83 aflag = 1; 84 break; 85 case 'c': 86 cflag = 1; 87 break; 88 case 'f': 89 fflag = 1; 90 break; 91 case 'm': 92 mflag = 1; 93 break; 94 case 'r': 95 timeset = 1; 96 stime_file(optarg, tv); 97 break; 98 case 't': 99 timeset = 1; 100 stime_arg1(optarg, tv); 101 break; 102 case '?': 103 default: 104 usage(); 105 } 106 argc -= optind; 107 argv += optind; 108 109 /* Default is both -a and -m. */ 110 if (aflag == 0 && mflag == 0) 111 aflag = mflag = 1; 112 113 /* 114 * If no -r or -t flag, at least two operands, the first of which 115 * is an 8 or 10 digit number, use the obsolete time specification. 116 */ 117 if (!timeset && argc > 1) { 118 (void)strtol(argv[0], &p, 10); 119 len = p - argv[0]; 120 if (*p == '\0' && (len == 8 || len == 10)) { 121 timeset = 1; 122 stime_arg2(argv[0], len == 10, tv); 123 argv++; 124 } 125 } 126 127 /* Otherwise use the current time of day. */ 128 if (!timeset) 129 tv[1] = tv[0]; 130 131 if (*argv == NULL) 132 usage(); 133 134 for (rval = 0; *argv; ++argv) { 135 /* See if the file exists. */ 136 if (stat(*argv, &sb)) 137 if (!cflag) { 138 /* Create the file. */ 139 fd = open(*argv, 140 O_WRONLY | O_CREAT, DEFFILEMODE); 141 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 142 rval = 1; 143 warn("%s", *argv); 144 continue; 145 } 146 147 /* If using the current time, we're done. */ 148 if (!timeset) 149 continue; 150 } else 151 continue; 152 153 if (!aflag) 154 /* TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);*/ 155 TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 156 if (!mflag) 157 /* TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);*/ 158 TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 159 160 161 /* Try utimes(2). */ 162 if (!utimes(*argv, tv)) 163 continue; 164 165 /* If the user specified a time, nothing else we can do. */ 166 if (timeset) { 167 rval = 1; 168 warn("%s", *argv); 169 } 170 171 /* 172 * System V and POSIX 1003.1 require that a NULL argument 173 * set the access/modification times to the current time. 174 * The permission checks are different, too, in that the 175 * ability to write the file is sufficient. Take a shot. 176 */ 177 if (!utimes(*argv, NULL)) 178 continue; 179 180 /* Try reading/writing. */ 181 if (rw(*argv, &sb, fflag)) 182 rval = 1; 183 } 184 exit(rval); 185 } 186 187 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 188 189 void 190 stime_arg1(arg, tvp) 191 char *arg; 192 struct timeval *tvp; 193 { 194 struct tm *t; 195 int yearset; 196 char *p; 197 /* Start with the current time. */ 198 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 199 err(1, "localtime"); 200 /* [[CC]YY]MMDDhhmm[.SS] */ 201 if ((p = strchr(arg, '.')) == NULL) 202 t->tm_sec = 0; /* Seconds defaults to 0. */ 203 else { 204 if (strlen(p + 1) != 2) 205 goto terr; 206 *p++ = '\0'; 207 t->tm_sec = ATOI2(p); 208 } 209 210 yearset = 0; 211 switch(strlen(arg)) { 212 case 12: /* CCYYMMDDhhmm */ 213 t->tm_year = ATOI2(arg); 214 t->tm_year *= 1000; 215 yearset = 1; 216 /* FALLTHOUGH */ 217 case 10: /* YYMMDDhhmm */ 218 if (yearset) { 219 yearset = ATOI2(arg); 220 t->tm_year += yearset; 221 } else { 222 yearset = ATOI2(arg); 223 if (yearset < 69) 224 t->tm_year = yearset + 2000; 225 else 226 t->tm_year = yearset + 1900; 227 } 228 t->tm_year -= 1900; /* Convert to UNIX time. */ 229 /* FALLTHROUGH */ 230 case 8: /* MMDDhhmm */ 231 t->tm_mon = ATOI2(arg); 232 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 233 t->tm_mday = ATOI2(arg); 234 t->tm_hour = ATOI2(arg); 235 t->tm_min = ATOI2(arg); 236 break; 237 default: 238 goto terr; 239 } 240 241 t->tm_isdst = -1; /* Figure out DST. */ 242 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 243 if (tvp[0].tv_sec == -1) 244 terr: errx(1, 245 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 246 247 tvp[0].tv_usec = tvp[1].tv_usec = 0; 248 } 249 250 void 251 stime_arg2(arg, year, tvp) 252 char *arg; 253 int year; 254 struct timeval *tvp; 255 { 256 struct tm *t; 257 /* Start with the current time. */ 258 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 259 err(1, "localtime"); 260 261 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 262 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 263 t->tm_mday = ATOI2(arg); 264 t->tm_hour = ATOI2(arg); 265 t->tm_min = ATOI2(arg); 266 if (year) 267 t->tm_year = ATOI2(arg); 268 269 t->tm_isdst = -1; /* Figure out DST. */ 270 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 271 if (tvp[0].tv_sec == -1) 272 errx(1, 273 "out of range or illegal time specification: MMDDhhmm[yy]"); 274 275 tvp[0].tv_usec = tvp[1].tv_usec = 0; 276 } 277 278 void 279 stime_file(fname, tvp) 280 char *fname; 281 struct timeval *tvp; 282 { 283 struct stat sb; 284 285 if (stat(fname, &sb)) 286 err(1, "%s", fname); 287 /* TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);*/ 288 TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 289 /* TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);*/ 290 TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 291 } 292 293 int 294 rw(fname, sbp, force) 295 char *fname; 296 struct stat *sbp; 297 int force; 298 { 299 int fd, needed_chmod, rval; 300 u_char byte; 301 302 /* Try regular files and directories. */ 303 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 304 warnx("%s: %s", fname, strerror(EFTYPE)); 305 return (1); 306 } 307 308 needed_chmod = rval = 0; 309 if ((fd = open(fname, O_RDWR, 0)) == -1) { 310 if (!force || chmod(fname, DEFFILEMODE)) 311 goto err; 312 if ((fd = open(fname, O_RDWR, 0)) == -1) 313 goto err; 314 needed_chmod = 1; 315 } 316 317 if (sbp->st_size != 0) { 318 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 319 goto err; 320 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 321 goto err; 322 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 323 goto err; 324 } else { 325 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 326 err: rval = 1; 327 warn("%s", fname); 328 } else if (ftruncate(fd, (off_t)0)) { 329 rval = 1; 330 warn("%s: file modified", fname); 331 } 332 } 333 334 if (close(fd) && rval != 1) { 335 rval = 1; 336 warn("%s", fname); 337 } 338 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 339 rval = 1; 340 warn("%s: permissions modified", fname); 341 } 342 return (rval); 343 } 344 345 volatile void 346 usage() 347 { 348 (void)fprintf(stderr, 349 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 350 exit(1); 351 } 352
Indexes created Tue Sep 30 17:09:57 GMT 2025