touch.c revision 1.8
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 1.8 1993/12/31 19:33:02 jtc Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <locale.h> 55 #include <time.h> 56 #include <unistd.h> 57 #include <err.h> 58 59 int rw __P((char *, struct stat *, int)); 60 void stime_arg1 __P((char *, struct timeval *)); 61 void stime_arg2 __P((char *, int, struct timeval *)); 62 void stime_file __P((char *, struct timeval *)); 63 void usage __P((void)); 64 65 #ifndef notyet 66 #define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp); 67 #endif 68 69 int 70 main(argc, argv) 71 int argc; 72 char *argv[]; 73 { 74 struct stat sb; 75 struct timeval tv[2]; 76 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 77 char *p; 78 79 setlocale(LC_ALL, ""); 80 81 aflag = cflag = fflag = mflag = timeset = 0; 82 if (gettimeofday(&tv[0], NULL)) 83 err(1, "gettimeofday"); 84 85 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 86 switch(ch) { 87 case 'a': 88 aflag = 1; 89 break; 90 case 'c': 91 cflag = 1; 92 break; 93 case 'f': 94 fflag = 1; 95 break; 96 case 'm': 97 mflag = 1; 98 break; 99 case 'r': 100 timeset = 1; 101 stime_file(optarg, tv); 102 break; 103 case 't': 104 timeset = 1; 105 stime_arg1(optarg, tv); 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argc -= optind; 112 argv += optind; 113 114 /* Default is both -a and -m. */ 115 if (aflag == 0 && mflag == 0) 116 aflag = mflag = 1; 117 118 /* 119 * If no -r or -t flag, at least two operands, the first of which 120 * is an 8 or 10 digit number, use the obsolete time specification. 121 */ 122 if (!timeset && argc > 1) { 123 (void)strtol(argv[0], &p, 10); 124 len = p - argv[0]; 125 if (*p == '\0' && (len == 8 || len == 10)) { 126 timeset = 1; 127 stime_arg2(argv[0], len == 10, tv); 128 argv++; 129 } 130 } 131 132 /* Otherwise use the current time of day. */ 133 if (!timeset) 134 tv[1] = tv[0]; 135 136 if (*argv == NULL) 137 usage(); 138 139 for (rval = 0; *argv; ++argv) { 140 /* See if the file exists. */ 141 if (stat(*argv, &sb)) 142 if (!cflag) { 143 /* Create the file. */ 144 fd = open(*argv, 145 O_WRONLY | O_CREAT, DEFFILEMODE); 146 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 147 rval = 1; 148 warn("%s", *argv); 149 continue; 150 } 151 152 /* If using the current time, we're done. */ 153 if (!timeset) 154 continue; 155 } else 156 continue; 157 158 if (!aflag) 159 #ifdef notyet 160 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 161 #else 162 TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime); 163 #endif 164 if (!mflag) 165 #ifdef notyet 166 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 167 #else 168 TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime); 169 #endif 170 171 172 /* Try utimes(2). */ 173 if (!utimes(*argv, tv)) 174 continue; 175 176 /* If the user specified a time, nothing else we can do. */ 177 if (timeset) { 178 rval = 1; 179 warn("%s", *argv); 180 continue; 181 } 182 183 /* 184 * System V and POSIX 1003.1 require that a NULL argument 185 * set the access/modification times to the current time. 186 * The permission checks are different, too, in that the 187 * ability to write the file is sufficient. Take a shot. 188 */ 189 if (!utimes(*argv, NULL)) 190 continue; 191 192 /* Try reading/writing. */ 193 if (rw(*argv, &sb, fflag)) 194 rval = 1; 195 } 196 exit(rval); 197 } 198 199 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 200 201 void 202 stime_arg1(arg, tvp) 203 char *arg; 204 struct timeval *tvp; 205 { 206 struct tm *t; 207 int yearset; 208 char *p; 209 /* Start with the current time. */ 210 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 211 err(1, "localtime"); 212 /* [[CC]YY]MMDDhhmm[.SS] */ 213 if ((p = strchr(arg, '.')) == NULL) 214 t->tm_sec = 0; /* Seconds defaults to 0. */ 215 else { 216 if (strlen(p + 1) != 2) 217 goto terr; 218 *p++ = '\0'; 219 t->tm_sec = ATOI2(p); 220 } 221 222 yearset = 0; 223 switch(strlen(arg)) { 224 case 12: /* CCYYMMDDhhmm */ 225 t->tm_year = ATOI2(arg); 226 t->tm_year *= 100; 227 yearset = 1; 228 /* FALLTHOUGH */ 229 case 10: /* YYMMDDhhmm */ 230 if (yearset) { 231 yearset = ATOI2(arg); 232 t->tm_year += yearset; 233 } else { 234 yearset = ATOI2(arg); 235 if (yearset < 69) 236 t->tm_year = yearset + 2000; 237 else 238 t->tm_year = yearset + 1900; 239 } 240 t->tm_year -= 1900; /* Convert to UNIX time. */ 241 /* FALLTHROUGH */ 242 case 8: /* MMDDhhmm */ 243 t->tm_mon = ATOI2(arg); 244 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 245 t->tm_mday = ATOI2(arg); 246 t->tm_hour = ATOI2(arg); 247 t->tm_min = ATOI2(arg); 248 break; 249 default: 250 goto terr; 251 } 252 253 t->tm_isdst = -1; /* Figure out DST. */ 254 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 255 if (tvp[0].tv_sec == -1) 256 terr: errx(1, 257 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 258 259 tvp[0].tv_usec = tvp[1].tv_usec = 0; 260 } 261 262 void 263 stime_arg2(arg, year, tvp) 264 char *arg; 265 int year; 266 struct timeval *tvp; 267 { 268 struct tm *t; 269 /* Start with the current time. */ 270 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 271 err(1, "localtime"); 272 273 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 274 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 275 t->tm_mday = ATOI2(arg); 276 t->tm_hour = ATOI2(arg); 277 t->tm_min = ATOI2(arg); 278 if (year) 279 t->tm_year = ATOI2(arg); 280 281 t->tm_isdst = -1; /* Figure out DST. */ 282 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 283 if (tvp[0].tv_sec == -1) 284 errx(1, 285 "out of range or illegal time specification: MMDDhhmm[yy]"); 286 287 tvp[0].tv_usec = tvp[1].tv_usec = 0; 288 } 289 290 void 291 stime_file(fname, tvp) 292 char *fname; 293 struct timeval *tvp; 294 { 295 struct stat sb; 296 297 if (stat(fname, &sb)) 298 err(1, "%s", fname); 299 #ifdef notyet 300 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 301 #else 302 TIMET_TO_TIMEVAL(tvp, &sb.st_atime); 303 #endif 304 #ifdef notyet 305 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 306 #else 307 TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime); 308 #endif 309 } 310 311 int 312 rw(fname, sbp, force) 313 char *fname; 314 struct stat *sbp; 315 int force; 316 { 317 int fd, needed_chmod, rval; 318 u_char byte; 319 320 /* Try regular files and directories. */ 321 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 322 warnx("%s: %s", fname, strerror(EFTYPE)); 323 return (1); 324 } 325 326 needed_chmod = rval = 0; 327 if ((fd = open(fname, O_RDWR, 0)) == -1) { 328 if (!force || chmod(fname, DEFFILEMODE)) 329 goto err; 330 if ((fd = open(fname, O_RDWR, 0)) == -1) 331 goto err; 332 needed_chmod = 1; 333 } 334 335 if (sbp->st_size != 0) { 336 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 337 goto err; 338 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 339 goto err; 340 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 341 goto err; 342 } else { 343 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 344 err: rval = 1; 345 warn("%s", fname); 346 } else if (ftruncate(fd, (off_t)0)) { 347 rval = 1; 348 warn("%s: file modified", fname); 349 } 350 } 351 352 if (close(fd) && rval != 1) { 353 rval = 1; 354 warn("%s", fname); 355 } 356 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 357 rval = 1; 358 warn("%s: permissions modified", fname); 359 } 360 return (rval); 361 } 362 363 volatile void 364 usage() 365 { 366 (void)fprintf(stderr, 367 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 368 exit(1); 369 } 370
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