touch.c revision 1.3
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 } 124 } 125 126 /* Otherwise use the current time of day. */ 127 if (!timeset) 128 tv[1] = tv[0]; 129 130 if (*argv == NULL) 131 usage(); 132 133 for (rval = 0; *argv; ++argv) { 134 /* See if the file exists. */ 135 if (stat(*argv, &sb)) 136 if (!cflag) { 137 /* Create the file. */ 138 fd = open(*argv, 139 O_WRONLY | O_CREAT, DEFFILEMODE); 140 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 141 rval = 1; 142 warn("%s", *argv); 143 continue; 144 } 145 146 /* If using the current time, we're done. */ 147 if (!timeset) 148 continue; 149 } else 150 continue; 151 152 if (!aflag) 153 /* TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);*/ 154 TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 155 if (!mflag) 156 /* TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);*/ 157 TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 158 159 160 /* Try utimes(2). */ 161 if (!utimes(*argv, tv)) 162 continue; 163 164 /* If the user specified a time, nothing else we can do. */ 165 if (timeset) { 166 rval = 1; 167 warn("%s", *argv); 168 } 169 170 /* 171 * System V and POSIX 1003.1 require that a NULL argument 172 * set the access/modification times to the current time. 173 * The permission checks are different, too, in that the 174 * ability to write the file is sufficient. Take a shot. 175 */ 176 if (!utimes(*argv, NULL)) 177 continue; 178 179 /* Try reading/writing. */ 180 if (rw(*argv, &sb, fflag)) 181 rval = 1; 182 } 183 exit(rval); 184 } 185 186 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 187 188 void 189 stime_arg1(arg, tvp) 190 char *arg; 191 struct timeval *tvp; 192 { 193 struct tm *t; 194 int yearset; 195 char *p; 196 /* Start with the current time. */ 197 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 198 err(1, "localtime"); 199 /* [[CC]YY]MMDDhhmm[.SS] */ 200 if ((p = strchr(arg, '.')) == NULL) 201 t->tm_sec = 0; /* Seconds defaults to 0. */ 202 else { 203 if (strlen(p + 1) != 2) 204 goto terr; 205 *p++ = '\0'; 206 t->tm_sec = ATOI2(p); 207 } 208 209 yearset = 0; 210 switch(strlen(arg)) { 211 case 12: /* CCYYMMDDhhmm */ 212 t->tm_year = ATOI2(arg); 213 t->tm_year *= 1000; 214 yearset = 1; 215 /* FALLTHOUGH */ 216 case 10: /* YYMMDDhhmm */ 217 if (yearset) { 218 yearset = ATOI2(arg); 219 t->tm_year += yearset; 220 } else { 221 yearset = ATOI2(arg); 222 if (yearset < 69) 223 t->tm_year = yearset + 2000; 224 else 225 t->tm_year = yearset + 1900; 226 } 227 t->tm_year -= 1900; /* Convert to UNIX time. */ 228 /* FALLTHROUGH */ 229 case 8: /* MMDDhhmm */ 230 t->tm_mon = ATOI2(arg); 231 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 232 t->tm_mday = ATOI2(arg); 233 t->tm_hour = ATOI2(arg); 234 t->tm_min = ATOI2(arg); 235 break; 236 default: 237 goto terr; 238 } 239 240 t->tm_isdst = -1; /* Figure out DST. */ 241 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 242 if (tvp[0].tv_sec == -1) 243 terr: errx(1, 244 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 245 246 tvp[0].tv_usec = tvp[1].tv_usec = 0; 247 } 248 249 void 250 stime_arg2(arg, year, tvp) 251 char *arg; 252 int year; 253 struct timeval *tvp; 254 { 255 struct tm *t; 256 /* Start with the current time. */ 257 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 258 err(1, "localtime"); 259 260 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 261 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 262 t->tm_mday = ATOI2(arg); 263 t->tm_hour = ATOI2(arg); 264 t->tm_min = ATOI2(arg); 265 if (year) 266 t->tm_year = ATOI2(arg); 267 268 t->tm_isdst = -1; /* Figure out DST. */ 269 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 270 if (tvp[0].tv_sec == -1) 271 errx(1, 272 "out of range or illegal time specification: MMDDhhmm[yy]"); 273 274 tvp[0].tv_usec = tvp[1].tv_usec = 0; 275 } 276 277 void 278 stime_file(fname, tvp) 279 char *fname; 280 struct timeval *tvp; 281 { 282 struct stat sb; 283 284 if (stat(fname, &sb)) 285 err(1, "%s", fname); 286 /* TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);*/ 287 TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 288 /* TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);*/ 289 TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 290 } 291 292 int 293 rw(fname, sbp, force) 294 char *fname; 295 struct stat *sbp; 296 int force; 297 { 298 int fd, needed_chmod, rval; 299 u_char byte; 300 301 /* Try regular files and directories. */ 302 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 303 warnx("%s: %s", fname, strerror(EFTYPE)); 304 return (1); 305 } 306 307 needed_chmod = rval = 0; 308 if ((fd = open(fname, O_RDWR, 0)) == -1) { 309 if (!force || chmod(fname, DEFFILEMODE)) 310 goto err; 311 if ((fd = open(fname, O_RDWR, 0)) == -1) 312 goto err; 313 needed_chmod = 1; 314 } 315 316 if (sbp->st_size != 0) { 317 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 318 goto err; 319 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 320 goto err; 321 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 322 goto err; 323 } else { 324 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 325 err: rval = 1; 326 warn("%s", fname); 327 } else if (ftruncate(fd, (off_t)0)) { 328 rval = 1; 329 warn("%s: file modified", fname); 330 } 331 } 332 333 if (close(fd) && rval != 1) { 334 rval = 1; 335 warn("%s", fname); 336 } 337 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 338 rval = 1; 339 warn("%s: permissions modified", fname); 340 } 341 return (rval); 342 } 343 344 volatile void 345 usage() 346 { 347 (void)fprintf(stderr, 348 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 349 exit(1); 350 } 351
Indexes created Tue Sep 30 17:09:57 GMT 2025