touch.c revision 1.26
1 /* $NetBSD: touch.c,v 1.26 2006/03/18 11:15:00 dsl 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95"; 41 #endif 42 __RCSID("$NetBSD: touch.c,v 1.26 2006/03/18 11:15:00 dsl 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 <locale.h> 56 #include <time.h> 57 #include <tzfile.h> 58 #include <unistd.h> 59 60 int main __P((int, char **)); 61 int rw __P((char *, struct stat *, int)); 62 void stime_arg1 __P((char *, struct timeval *)); 63 void stime_arg2 __P((char *, int, struct timeval *)); 64 void stime_file __P((char *, struct timeval *)); 65 void usage __P((void)); 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, hflag, mflag, ch, fd, len, rval, timeset; 75 char *p; 76 int (*change_file_times) __P((const char *, const struct timeval *)); 77 int (*get_file_status) __P((const char *, struct stat *)); 78 79 setlocale(LC_ALL, ""); 80 81 aflag = cflag = fflag = hflag = mflag = timeset = 0; 82 if (gettimeofday(&tv[0], NULL)) 83 err(1, "gettimeofday"); 84 85 while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1) 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 'h': 97 hflag = 1; 98 break; 99 case 'm': 100 mflag = 1; 101 break; 102 case 'r': 103 timeset = 1; 104 stime_file(optarg, tv); 105 break; 106 case 't': 107 timeset = 1; 108 stime_arg1(optarg, tv); 109 break; 110 case '?': 111 default: 112 usage(); 113 } 114 argc -= optind; 115 argv += optind; 116 117 /* Default is both -a and -m. */ 118 if (aflag == 0 && mflag == 0) 119 aflag = mflag = 1; 120 121 if (hflag) { 122 cflag = 1; /* Don't create new file */ 123 change_file_times = lutimes; 124 get_file_status = lstat; 125 } else { 126 change_file_times = utimes; 127 get_file_status = stat; 128 } 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(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 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) * 100 - TM_YEAR_BASE; 229 yearset = 1; 230 /* FALLTHROUGH */ 231 case 10: /* YYMMDDhhmm */ 232 if (yearset) { 233 t->tm_year += ATOI2(arg); 234 } else { 235 yearset = ATOI2(arg); 236 if (yearset < 69) 237 t->tm_year = yearset + 2000 - TM_YEAR_BASE; 238 else 239 t->tm_year = yearset + 1900 - TM_YEAR_BASE; 240 } 241 /* FALLTHROUGH */ 242 case 8: /* MMDDhhmm */ 243 t->tm_mon = ATOI2(arg); 244 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 245 /* FALLTHROUGH */ 246 case 6: 247 t->tm_mday = ATOI2(arg); 248 /* FALLTHROUGH */ 249 case 4: 250 t->tm_hour = ATOI2(arg); 251 /* FALLTHROUGH */ 252 case 2: 253 t->tm_min = ATOI2(arg); 254 break; 255 default: 256 goto terr; 257 } 258 259 t->tm_isdst = -1; /* Figure out DST. */ 260 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 261 if (tvp[0].tv_sec == -1) 262 terr: errx(1, 263 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 264 265 tvp[0].tv_usec = tvp[1].tv_usec = 0; 266 } 267 268 void 269 stime_arg2(arg, year, tvp) 270 char *arg; 271 int year; 272 struct timeval *tvp; 273 { 274 struct tm *t; 275 time_t tmptime; 276 /* Start with the current time. */ 277 tmptime = tvp[0].tv_sec; 278 if ((t = localtime(&tmptime)) == NULL) 279 err(1, "localtime"); 280 281 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 282 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 283 t->tm_mday = ATOI2(arg); 284 t->tm_hour = ATOI2(arg); 285 t->tm_min = ATOI2(arg); 286 if (year) { 287 year = ATOI2(arg); 288 if (year < 69) 289 t->tm_year = year + 2000 - TM_YEAR_BASE; 290 else 291 t->tm_year = year + 1900 - TM_YEAR_BASE; 292 } 293 t->tm_sec = 0; 294 295 t->tm_isdst = -1; /* Figure out DST. */ 296 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 297 if (tvp[0].tv_sec == -1) 298 errx(1, 299 "out of range or illegal time specification: MMDDhhmm[yy]"); 300 301 tvp[0].tv_usec = tvp[1].tv_usec = 0; 302 } 303 304 void 305 stime_file(fname, tvp) 306 char *fname; 307 struct timeval *tvp; 308 { 309 struct stat sb; 310 311 if (stat(fname, &sb)) 312 err(1, "%s", fname); 313 TIMESPEC_TO_TIMEVAL(&tvp[0], &sb.st_atimespec); 314 TIMESPEC_TO_TIMEVAL(&tvp[1], &sb.st_mtimespec); 315 } 316 317 int 318 rw(fname, sbp, force) 319 char *fname; 320 struct stat *sbp; 321 int force; 322 { 323 int fd, needed_chmod, rval; 324 u_char byte; 325 326 /* Try regular files and directories. */ 327 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 328 warnx("%s: %s", fname, strerror(EFTYPE)); 329 return (1); 330 } 331 332 needed_chmod = rval = 0; 333 if ((fd = open(fname, O_RDWR, 0)) == -1) { 334 if (!force || chmod(fname, DEFFILEMODE)) 335 goto err; 336 if ((fd = open(fname, O_RDWR, 0)) == -1) 337 goto err; 338 needed_chmod = 1; 339 } 340 341 if (sbp->st_size != 0) { 342 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 343 goto err; 344 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 345 goto err; 346 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 347 goto err; 348 } else { 349 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 350 err: rval = 1; 351 warn("%s", fname); 352 } else if (ftruncate(fd, (off_t)0)) { 353 rval = 1; 354 warn("%s: file modified", fname); 355 } 356 } 357 358 if (fd >= 0 && close(fd) && rval != 1) { 359 rval = 1; 360 warn("%s", fname); 361 } 362 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 363 rval = 1; 364 warn("%s: permissions modified", fname); 365 } 366 return (rval); 367 } 368 369 __dead void 370 usage() 371 { 372 (void)fprintf(stderr, 373 "usage: touch [-acfhm] [-r file] [-t time] file ...\n"); 374 exit(1); 375 } 376
Indexes created Tue Sep 30 20:09:53 GMT 2025