touch.c revision 1.16
1 /* $NetBSD: touch.c,v 1.16 1997/10/21 18:25:26 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95"; 45 #endif 46 __RCSID("$NetBSD: touch.c,v 1.16 1997/10/21 18:25:26 thorpej Exp $"); 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <sys/stat.h> 51 #include <sys/time.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <locale.h> 60 #include <time.h> 61 #include <unistd.h> 62 63 int main __P((int, char **)); 64 int rw __P((char *, struct stat *, int)); 65 void stime_arg1 __P((char *, struct timeval *)); 66 void stime_arg2 __P((char *, int, struct timeval *)); 67 void stime_file __P((char *, struct timeval *)); 68 void usage __P((void)); 69 70 int hflag; /* needed by the following */ 71 72 int change_file_times __P((const char *, const struct timeval *)); 73 int get_file_status __P((const char *, struct stat *)); 74 75 int 76 main(argc, argv) 77 int argc; 78 char *argv[]; 79 { 80 struct stat sb; 81 struct timeval tv[2]; 82 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 83 char *p; 84 85 setlocale(LC_ALL, ""); 86 87 aflag = cflag = fflag = hflag = mflag = timeset = 0; 88 if (gettimeofday(&tv[0], NULL)) 89 err(1, "gettimeofday"); 90 91 while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1) 92 switch(ch) { 93 case 'a': 94 aflag = 1; 95 break; 96 case 'c': 97 cflag = 1; 98 break; 99 case 'f': 100 fflag = 1; 101 break; 102 case 'h': 103 hflag = 1; 104 break; 105 case 'm': 106 mflag = 1; 107 break; 108 case 'r': 109 timeset = 1; 110 stime_file(optarg, tv); 111 break; 112 case 't': 113 timeset = 1; 114 stime_arg1(optarg, tv); 115 break; 116 case '?': 117 default: 118 usage(); 119 } 120 argc -= optind; 121 argv += optind; 122 123 /* Default is both -a and -m. */ 124 if (aflag == 0 && mflag == 0) 125 aflag = mflag = 1; 126 127 if (hflag) 128 cflag = 1; /* Don't create new file */ 129 130 /* 131 * If no -r or -t flag, at least two operands, the first of which 132 * is an 8 or 10 digit number, use the obsolete time specification. 133 */ 134 if (!timeset && argc > 1) { 135 (void)strtol(argv[0], &p, 10); 136 len = p - argv[0]; 137 if (*p == '\0' && (len == 8 || len == 10)) { 138 timeset = 1; 139 stime_arg2(*argv++, len == 10, tv); 140 } 141 } 142 143 /* Otherwise use the current time of day. */ 144 if (!timeset) 145 tv[1] = tv[0]; 146 147 if (*argv == NULL) 148 usage(); 149 150 for (rval = 0; *argv; ++argv) { 151 /* See if the file exists. */ 152 if (get_file_status(*argv, &sb)) 153 if (!cflag) { 154 /* Create the file. */ 155 fd = open(*argv, 156 O_WRONLY | O_CREAT, DEFFILEMODE); 157 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 158 rval = 1; 159 warn("%s", *argv); 160 continue; 161 } 162 163 /* If using the current time, we're done. */ 164 if (!timeset) 165 continue; 166 } else 167 continue; 168 169 if (!aflag) 170 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 171 if (!mflag) 172 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 173 174 /* Try utimes(2). */ 175 if (!change_file_times(*argv, tv)) 176 continue; 177 178 /* If the user specified a time, nothing else we can do. */ 179 if (timeset) { 180 rval = 1; 181 warn("%s", *argv); 182 } 183 184 /* 185 * System V and POSIX 1003.1 require that a NULL argument 186 * set the access/modification times to the current time. 187 * The permission checks are different, too, in that the 188 * ability to write the file is sufficient. Take a shot. 189 */ 190 if (!change_file_times(*argv, NULL)) 191 continue; 192 193 /* Try reading/writing. */ 194 if (!S_ISLNK(sb.st_mode) && rw(*argv, &sb, fflag)) 195 rval = 1; 196 } 197 exit(rval); 198 } 199 200 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 201 202 void 203 stime_arg1(arg, tvp) 204 char *arg; 205 struct timeval *tvp; 206 { 207 struct tm *t; 208 time_t tmptime; 209 int yearset; 210 char *p; 211 /* Start with the current time. */ 212 tmptime = tvp[0].tv_sec; 213 if ((t = localtime(&tmptime)) == NULL) 214 err(1, "localtime"); 215 /* [[CC]YY]MMDDhhmm[.SS] */ 216 if ((p = strchr(arg, '.')) == NULL) 217 t->tm_sec = 0; /* Seconds defaults to 0. */ 218 else { 219 if (strlen(p + 1) != 2) 220 goto terr; 221 *p++ = '\0'; 222 t->tm_sec = ATOI2(p); 223 } 224 225 yearset = 0; 226 switch(strlen(arg)) { 227 case 12: /* CCYYMMDDhhmm */ 228 t->tm_year = ATOI2(arg); 229 t->tm_year *= 100; 230 yearset = 1; 231 /* FALLTHOUGH */ 232 case 10: /* YYMMDDhhmm */ 233 if (yearset) { 234 yearset = ATOI2(arg); 235 t->tm_year += yearset; 236 } else { 237 yearset = ATOI2(arg); 238 if (yearset < 69) 239 t->tm_year = yearset + 2000; 240 else 241 t->tm_year = yearset + 1900; 242 } 243 t->tm_year -= 1900; /* Convert to UNIX time. */ 244 /* FALLTHROUGH */ 245 case 8: /* MMDDhhmm */ 246 t->tm_mon = ATOI2(arg); 247 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 248 t->tm_mday = ATOI2(arg); 249 t->tm_hour = ATOI2(arg); 250 t->tm_min = ATOI2(arg); 251 break; 252 default: 253 goto terr; 254 } 255 256 t->tm_isdst = -1; /* Figure out DST. */ 257 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 258 if (tvp[0].tv_sec == -1) 259 terr: errx(1, 260 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 261 262 tvp[0].tv_usec = tvp[1].tv_usec = 0; 263 } 264 265 void 266 stime_arg2(arg, year, tvp) 267 char *arg; 268 int year; 269 struct timeval *tvp; 270 { 271 struct tm *t; 272 time_t tmptime; 273 /* Start with the current time. */ 274 tmptime = tvp[0].tv_sec; 275 if ((t = localtime(&tmptime)) == NULL) 276 err(1, "localtime"); 277 278 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 279 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 280 t->tm_mday = ATOI2(arg); 281 t->tm_hour = ATOI2(arg); 282 t->tm_min = ATOI2(arg); 283 if (year) 284 t->tm_year = ATOI2(arg); 285 286 t->tm_isdst = -1; /* Figure out DST. */ 287 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 288 if (tvp[0].tv_sec == -1) 289 errx(1, 290 "out of range or illegal time specification: MMDDhhmm[yy]"); 291 292 tvp[0].tv_usec = tvp[1].tv_usec = 0; 293 } 294 295 void 296 stime_file(fname, tvp) 297 char *fname; 298 struct timeval *tvp; 299 { 300 struct stat sb; 301 302 if (stat(fname, &sb)) 303 err(1, "%s", fname); 304 TIMESPEC_TO_TIMEVAL(&tvp[0], &sb.st_atimespec); 305 TIMESPEC_TO_TIMEVAL(&tvp[1], &sb.st_mtimespec); 306 } 307 308 int 309 rw(fname, sbp, force) 310 char *fname; 311 struct stat *sbp; 312 int force; 313 { 314 int fd, needed_chmod, rval; 315 u_char byte; 316 317 /* Try regular files and directories. */ 318 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 319 warnx("%s: %s", fname, strerror(EFTYPE)); 320 return (1); 321 } 322 323 needed_chmod = rval = 0; 324 if ((fd = open(fname, O_RDWR, 0)) == -1) { 325 if (!force || chmod(fname, DEFFILEMODE)) 326 goto err; 327 if ((fd = open(fname, O_RDWR, 0)) == -1) 328 goto err; 329 needed_chmod = 1; 330 } 331 332 if (sbp->st_size != 0) { 333 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 334 goto err; 335 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 336 goto err; 337 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 338 goto err; 339 } else { 340 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 341 err: rval = 1; 342 warn("%s", fname); 343 } else if (ftruncate(fd, (off_t)0)) { 344 rval = 1; 345 warn("%s: file modified", fname); 346 } 347 } 348 349 if (close(fd) && rval != 1) { 350 rval = 1; 351 warn("%s", fname); 352 } 353 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 354 rval = 1; 355 warn("%s: permissions modified", fname); 356 } 357 return (rval); 358 } 359 360 int 361 change_file_times(path, tvp) 362 const char *path; 363 const struct timeval *tvp; 364 { 365 366 if (hflag) 367 return (lutimes(path, tvp)); 368 369 return (utimes(path, tvp)); 370 } 371 372 int 373 get_file_status(path, sb) 374 const char *path; 375 struct stat *sb; 376 { 377 378 if (hflag) 379 return (lstat(path, sb)); 380 381 return (stat(path, sb)); 382 } 383 384 __dead void 385 usage() 386 { 387 (void)fprintf(stderr, 388 "usage: touch [-acfhm] [-r file] [-t time] file ...\n"); 389 exit(1); 390 } 391
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