touch.c revision 1.13
1 /* $NetBSD: touch.c,v 1.13 1997/10/11 03:12:17 enami 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 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 static char rcsid[] = "$NetBSD: touch.c,v 1.13 1997/10/11 03:12:17 enami 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 rw __P((char *, struct stat *, int)); 64 void stime_arg1 __P((char *, struct timeval *)); 65 void stime_arg2 __P((char *, int, struct timeval *)); 66 void stime_file __P((char *, struct timeval *)); 67 void usage __P((void)); 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, hflag, mflag, ch, fd, len, rval, timeset; 77 char *p; 78 int (*change_file_times) __P((const char *, const struct timeval *)); 79 int (*get_file_status) __P((const char *, struct stat *)); 80 81 setlocale(LC_ALL, ""); 82 83 aflag = cflag = fflag = hflag = mflag = timeset = 0; 84 if (gettimeofday(&tv[0], NULL)) 85 err(1, "gettimeofday"); 86 87 while ((ch = getopt(argc, argv, "acfhmr:t:")) != EOF) 88 switch(ch) { 89 case 'a': 90 aflag = 1; 91 break; 92 case 'c': 93 cflag = 1; 94 break; 95 case 'f': 96 fflag = 1; 97 break; 98 case 'h': 99 hflag = 1; 100 break; 101 case 'm': 102 mflag = 1; 103 break; 104 case 'r': 105 timeset = 1; 106 stime_file(optarg, tv); 107 break; 108 case 't': 109 timeset = 1; 110 stime_arg1(optarg, tv); 111 break; 112 case '?': 113 default: 114 usage(); 115 } 116 argc -= optind; 117 argv += optind; 118 119 /* Default is both -a and -m. */ 120 if (aflag == 0 && mflag == 0) 121 aflag = mflag = 1; 122 123 if (hflag) { 124 cflag = 1; /* Don't create new file */ 125 change_file_times = lutimes; 126 get_file_status = lstat; 127 } else { 128 change_file_times = utimes; 129 get_file_status = stat; 130 } 131 132 /* 133 * If no -r or -t flag, at least two operands, the first of which 134 * is an 8 or 10 digit number, use the obsolete time specification. 135 */ 136 if (!timeset && argc > 1) { 137 (void)strtol(argv[0], &p, 10); 138 len = p - argv[0]; 139 if (*p == '\0' && (len == 8 || len == 10)) { 140 timeset = 1; 141 stime_arg2(*argv++, len == 10, tv); 142 } 143 } 144 145 /* Otherwise use the current time of day. */ 146 if (!timeset) 147 tv[1] = tv[0]; 148 149 if (*argv == NULL) 150 usage(); 151 152 for (rval = 0; *argv; ++argv) { 153 /* See if the file exists. */ 154 if ((*get_file_status)(*argv, &sb)) 155 if (!cflag) { 156 /* Create the file. */ 157 fd = open(*argv, 158 O_WRONLY | O_CREAT, DEFFILEMODE); 159 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 160 rval = 1; 161 warn("%s", *argv); 162 continue; 163 } 164 165 /* If using the current time, we're done. */ 166 if (!timeset) 167 continue; 168 } else 169 continue; 170 171 if (!aflag) 172 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 173 if (!mflag) 174 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 175 176 /* Try utimes(2). */ 177 if (!(*change_file_times)(*argv, tv)) 178 continue; 179 180 /* If the user specified a time, nothing else we can do. */ 181 if (timeset) { 182 rval = 1; 183 warn("%s", *argv); 184 } 185 186 /* 187 * System V and POSIX 1003.1 require that a NULL argument 188 * set the access/modification times to the current time. 189 * The permission checks are different, too, in that the 190 * ability to write the file is sufficient. Take a shot. 191 */ 192 if (!(*change_file_times)(*argv, NULL)) 193 continue; 194 195 /* Try reading/writing. */ 196 if (!S_ISLNK(sb.st_mode) && rw(*argv, &sb, fflag)) 197 rval = 1; 198 } 199 exit(rval); 200 } 201 202 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 203 204 void 205 stime_arg1(arg, tvp) 206 char *arg; 207 struct timeval *tvp; 208 { 209 struct tm *t; 210 time_t tmptime; 211 int yearset; 212 char *p; 213 /* Start with the current time. */ 214 tmptime = tvp[0].tv_sec; 215 if ((t = localtime(&tmptime)) == NULL) 216 err(1, "localtime"); 217 /* [[CC]YY]MMDDhhmm[.SS] */ 218 if ((p = strchr(arg, '.')) == NULL) 219 t->tm_sec = 0; /* Seconds defaults to 0. */ 220 else { 221 if (strlen(p + 1) != 2) 222 goto terr; 223 *p++ = '\0'; 224 t->tm_sec = ATOI2(p); 225 } 226 227 yearset = 0; 228 switch(strlen(arg)) { 229 case 12: /* CCYYMMDDhhmm */ 230 t->tm_year = ATOI2(arg); 231 t->tm_year *= 100; 232 yearset = 1; 233 /* FALLTHOUGH */ 234 case 10: /* YYMMDDhhmm */ 235 if (yearset) { 236 yearset = ATOI2(arg); 237 t->tm_year += yearset; 238 } else { 239 yearset = ATOI2(arg); 240 if (yearset < 69) 241 t->tm_year = yearset + 2000; 242 else 243 t->tm_year = yearset + 1900; 244 } 245 t->tm_year -= 1900; /* Convert to UNIX time. */ 246 /* FALLTHROUGH */ 247 case 8: /* MMDDhhmm */ 248 t->tm_mon = ATOI2(arg); 249 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 250 t->tm_mday = ATOI2(arg); 251 t->tm_hour = ATOI2(arg); 252 t->tm_min = ATOI2(arg); 253 break; 254 default: 255 goto terr; 256 } 257 258 t->tm_isdst = -1; /* Figure out DST. */ 259 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 260 if (tvp[0].tv_sec == -1) 261 terr: errx(1, 262 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 263 264 tvp[0].tv_usec = tvp[1].tv_usec = 0; 265 } 266 267 void 268 stime_arg2(arg, year, tvp) 269 char *arg; 270 int year; 271 struct timeval *tvp; 272 { 273 struct tm *t; 274 time_t tmptime; 275 /* Start with the current time. */ 276 tmptime = tvp[0].tv_sec; 277 if ((t = localtime(&tmptime)) == NULL) 278 err(1, "localtime"); 279 280 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 281 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 282 t->tm_mday = ATOI2(arg); 283 t->tm_hour = ATOI2(arg); 284 t->tm_min = ATOI2(arg); 285 if (year) 286 t->tm_year = ATOI2(arg); 287 288 t->tm_isdst = -1; /* Figure out DST. */ 289 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 290 if (tvp[0].tv_sec == -1) 291 errx(1, 292 "out of range or illegal time specification: MMDDhhmm[yy]"); 293 294 tvp[0].tv_usec = tvp[1].tv_usec = 0; 295 } 296 297 void 298 stime_file(fname, tvp) 299 char *fname; 300 struct timeval *tvp; 301 { 302 struct stat sb; 303 304 if (stat(fname, &sb)) 305 err(1, "%s", fname); 306 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 307 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 308 } 309 310 int 311 rw(fname, sbp, force) 312 char *fname; 313 struct stat *sbp; 314 int force; 315 { 316 int fd, needed_chmod, rval; 317 u_char byte; 318 319 /* Try regular files and directories. */ 320 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 321 warnx("%s: %s", fname, strerror(EFTYPE)); 322 return (1); 323 } 324 325 needed_chmod = rval = 0; 326 if ((fd = open(fname, O_RDWR, 0)) == -1) { 327 if (!force || chmod(fname, DEFFILEMODE)) 328 goto err; 329 if ((fd = open(fname, O_RDWR, 0)) == -1) 330 goto err; 331 needed_chmod = 1; 332 } 333 334 if (sbp->st_size != 0) { 335 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 336 goto err; 337 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 338 goto err; 339 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 340 goto err; 341 } else { 342 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 343 err: rval = 1; 344 warn("%s", fname); 345 } else if (ftruncate(fd, (off_t)0)) { 346 rval = 1; 347 warn("%s: file modified", fname); 348 } 349 } 350 351 if (close(fd) && rval != 1) { 352 rval = 1; 353 warn("%s", fname); 354 } 355 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 356 rval = 1; 357 warn("%s: permissions modified", fname); 358 } 359 return (rval); 360 } 361 362 __dead void 363 usage() 364 { 365 (void)fprintf(stderr, 366 "usage: touch [-acfhm] [-r file] [-t time] file ...\n"); 367 exit(1); 368 } 369
Indexes created Tue Sep 30 17:09:57 GMT 2025