touch.c revision 1.5
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 1.5 1993/08/01 18:04:42 mycroft 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 /*temporary we aren't 4.4 portability hack*/ 65 #define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 struct stat sb; 73 struct timeval tv[2]; 74 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 75 char *p; 76 77 aflag = cflag = fflag = mflag = timeset = 0; 78 if (gettimeofday(&tv[0], NULL)) 79 err(1, "gettimeofday"); 80 81 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 82 switch(ch) { 83 case 'a': 84 aflag = 1; 85 break; 86 case 'c': 87 cflag = 1; 88 break; 89 case 'f': 90 fflag = 1; 91 break; 92 case 'm': 93 mflag = 1; 94 break; 95 case 'r': 96 timeset = 1; 97 stime_file(optarg, tv); 98 break; 99 case 't': 100 timeset = 1; 101 stime_arg1(optarg, tv); 102 break; 103 case '?': 104 default: 105 usage(); 106 } 107 argc -= optind; 108 argv += optind; 109 110 /* Default is both -a and -m. */ 111 if (aflag == 0 && mflag == 0) 112 aflag = mflag = 1; 113 114 /* 115 * If no -r or -t flag, at least two operands, the first of which 116 * is an 8 or 10 digit number, use the obsolete time specification. 117 */ 118 if (!timeset && argc > 1) { 119 (void)strtol(argv[0], &p, 10); 120 len = p - argv[0]; 121 if (*p == '\0' && (len == 8 || len == 10)) { 122 timeset = 1; 123 stime_arg2(argv[0], len == 10, tv); 124 argv++; 125 } 126 } 127 128 /* Otherwise use the current time of day. */ 129 if (!timeset) 130 tv[1] = tv[0]; 131 132 if (*argv == NULL) 133 usage(); 134 135 for (rval = 0; *argv; ++argv) { 136 /* See if the file exists. */ 137 if (stat(*argv, &sb)) 138 if (!cflag) { 139 /* Create the file. */ 140 fd = open(*argv, 141 O_WRONLY | O_CREAT, DEFFILEMODE); 142 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 143 rval = 1; 144 warn("%s", *argv); 145 continue; 146 } 147 148 /* If using the current time, we're done. */ 149 if (!timeset) 150 continue; 151 } else 152 continue; 153 154 if (!aflag) 155 /* TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);*/ 156 TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 157 if (!mflag) 158 /* TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);*/ 159 TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 160 161 162 /* Try utimes(2). */ 163 if (!utimes(*argv, tv)) 164 continue; 165 166 /* If the user specified a time, nothing else we can do. */ 167 if (timeset) { 168 rval = 1; 169 warn("%s", *argv); 170 } 171 172 /* 173 * System V and POSIX 1003.1 require that a NULL argument 174 * set the access/modification times to the current time. 175 * The permission checks are different, too, in that the 176 * ability to write the file is sufficient. Take a shot. 177 */ 178 if (!utimes(*argv, NULL)) 179 continue; 180 181 /* Try reading/writing. */ 182 if (rw(*argv, &sb, fflag)) 183 rval = 1; 184 } 185 exit(rval); 186 } 187 188 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 189 190 void 191 stime_arg1(arg, tvp) 192 char *arg; 193 struct timeval *tvp; 194 { 195 struct tm *t; 196 int yearset; 197 char *p; 198 /* Start with the current time. */ 199 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 200 err(1, "localtime"); 201 /* [[CC]YY]MMDDhhmm[.SS] */ 202 if ((p = strchr(arg, '.')) == NULL) 203 t->tm_sec = 0; /* Seconds defaults to 0. */ 204 else { 205 if (strlen(p + 1) != 2) 206 goto terr; 207 *p++ = '\0'; 208 t->tm_sec = ATOI2(p); 209 } 210 211 yearset = 0; 212 switch(strlen(arg)) { 213 case 12: /* CCYYMMDDhhmm */ 214 t->tm_year = ATOI2(arg); 215 t->tm_year *= 1000; 216 yearset = 1; 217 /* FALLTHOUGH */ 218 case 10: /* YYMMDDhhmm */ 219 if (yearset) { 220 yearset = ATOI2(arg); 221 t->tm_year += yearset; 222 } else { 223 yearset = ATOI2(arg); 224 if (yearset < 69) 225 t->tm_year = yearset + 2000; 226 else 227 t->tm_year = yearset + 1900; 228 } 229 t->tm_year -= 1900; /* Convert to UNIX time. */ 230 /* FALLTHROUGH */ 231 case 8: /* MMDDhhmm */ 232 t->tm_mon = ATOI2(arg); 233 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 234 t->tm_mday = ATOI2(arg); 235 t->tm_hour = ATOI2(arg); 236 t->tm_min = ATOI2(arg); 237 break; 238 default: 239 goto terr; 240 } 241 242 t->tm_isdst = -1; /* Figure out DST. */ 243 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 244 if (tvp[0].tv_sec == -1) 245 terr: errx(1, 246 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 247 248 tvp[0].tv_usec = tvp[1].tv_usec = 0; 249 } 250 251 void 252 stime_arg2(arg, year, tvp) 253 char *arg; 254 int year; 255 struct timeval *tvp; 256 { 257 struct tm *t; 258 /* Start with the current time. */ 259 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 260 err(1, "localtime"); 261 262 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 263 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 264 t->tm_mday = ATOI2(arg); 265 t->tm_hour = ATOI2(arg); 266 t->tm_min = ATOI2(arg); 267 if (year) 268 t->tm_year = ATOI2(arg); 269 270 t->tm_isdst = -1; /* Figure out DST. */ 271 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 272 if (tvp[0].tv_sec == -1) 273 errx(1, 274 "out of range or illegal time specification: MMDDhhmm[yy]"); 275 276 tvp[0].tv_usec = tvp[1].tv_usec = 0; 277 } 278 279 void 280 stime_file(fname, tvp) 281 char *fname; 282 struct timeval *tvp; 283 { 284 struct stat sb; 285 286 if (stat(fname, &sb)) 287 err(1, "%s", fname); 288 /* TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);*/ 289 TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 290 /* TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);*/ 291 TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 292 } 293 294 int 295 rw(fname, sbp, force) 296 char *fname; 297 struct stat *sbp; 298 int force; 299 { 300 int fd, needed_chmod, rval; 301 u_char byte; 302 303 /* Try regular files and directories. */ 304 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 305 warnx("%s: %s", fname, strerror(EFTYPE)); 306 return (1); 307 } 308 309 needed_chmod = rval = 0; 310 if ((fd = open(fname, O_RDWR, 0)) == -1) { 311 if (!force || chmod(fname, DEFFILEMODE)) 312 goto err; 313 if ((fd = open(fname, O_RDWR, 0)) == -1) 314 goto err; 315 needed_chmod = 1; 316 } 317 318 if (sbp->st_size != 0) { 319 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 320 goto err; 321 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 322 goto err; 323 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 324 goto err; 325 } else { 326 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 327 err: rval = 1; 328 warn("%s", fname); 329 } else if (ftruncate(fd, (off_t)0)) { 330 rval = 1; 331 warn("%s: file modified", fname); 332 } 333 } 334 335 if (close(fd) && rval != 1) { 336 rval = 1; 337 warn("%s", fname); 338 } 339 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 340 rval = 1; 341 warn("%s: permissions modified", fname); 342 } 343 return (rval); 344 } 345 346 volatile void 347 usage() 348 { 349 (void)fprintf(stderr, 350 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 351 exit(1); 352 } 353
Indexes created Tue Sep 30 17:09:57 GMT 2025