touch.c revision 1.18
1 /* $NetBSD: touch.c,v 1.18 1998/01/20 20:53:32 mycroft 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 1.18 1998/01/20 20:53:32 mycroft 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 71 main(argc, argv) 72 int argc; 73 char *argv[]; 74 { 75 struct stat sb; 76 struct timeval tv[2]; 77 int aflag, cflag, fflag, hflag, mflag, ch, fd, len, rval, timeset; 78 char *p; 79 int (*change_file_times) __P((const char *, const struct timeval *)); 80 int (*get_file_status) __P((const char *, struct stat *)); 81 82 setlocale(LC_ALL, ""); 83 84 aflag = cflag = fflag = hflag = mflag = timeset = 0; 85 if (gettimeofday(&tv[0], NULL)) 86 err(1, "gettimeofday"); 87 88 while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1) 89 switch(ch) { 90 case 'a': 91 aflag = 1; 92 break; 93 case 'c': 94 cflag = 1; 95 break; 96 case 'f': 97 fflag = 1; 98 break; 99 case 'h': 100 hflag = 1; 101 break; 102 case 'm': 103 mflag = 1; 104 break; 105 case 'r': 106 timeset = 1; 107 stime_file(optarg, tv); 108 break; 109 case 't': 110 timeset = 1; 111 stime_arg1(optarg, tv); 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 argc -= optind; 118 argv += optind; 119 120 /* Default is both -a and -m. */ 121 if (aflag == 0 && mflag == 0) 122 aflag = mflag = 1; 123 124 if (hflag) { 125 cflag = 1; /* Don't create new file */ 126 change_file_times = lutimes; 127 get_file_status = lstat; 128 } else { 129 change_file_times = utimes; 130 get_file_status = stat; 131 } 132 133 /* 134 * If no -r or -t flag, at least two operands, the first of which 135 * is an 8 or 10 digit number, use the obsolete time specification. 136 */ 137 if (!timeset && argc > 1) { 138 (void)strtol(argv[0], &p, 10); 139 len = p - argv[0]; 140 if (*p == '\0' && (len == 8 || len == 10)) { 141 timeset = 1; 142 stime_arg2(*argv++, len == 10, tv); 143 } 144 } 145 146 /* Otherwise use the current time of day. */ 147 if (!timeset) 148 tv[1] = tv[0]; 149 150 if (*argv == NULL) 151 usage(); 152 153 for (rval = 0; *argv; ++argv) { 154 /* See if the file exists. */ 155 if ((*get_file_status)(*argv, &sb)) 156 if (!cflag) { 157 /* Create the file. */ 158 fd = open(*argv, 159 O_WRONLY | O_CREAT, DEFFILEMODE); 160 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 161 rval = 1; 162 warn("%s", *argv); 163 continue; 164 } 165 166 /* If using the current time, we're done. */ 167 if (!timeset) 168 continue; 169 } else 170 continue; 171 172 if (!aflag) 173 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 174 if (!mflag) 175 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 176 177 /* Try utimes(2). */ 178 if (!(*change_file_times)(*argv, tv)) 179 continue; 180 181 /* If the user specified a time, nothing else we can do. */ 182 if (timeset) { 183 rval = 1; 184 warn("%s", *argv); 185 } 186 187 /* 188 * System V and POSIX 1003.1 require that a NULL argument 189 * set the access/modification times to the current time. 190 * The permission checks are different, too, in that the 191 * ability to write the file is sufficient. Take a shot. 192 */ 193 if (!(*change_file_times)(*argv, NULL)) 194 continue; 195 196 /* Try reading/writing. */ 197 if (!S_ISLNK(sb.st_mode) && rw(*argv, &sb, fflag)) 198 rval = 1; 199 } 200 exit(rval); 201 } 202 203 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 204 205 void 206 stime_arg1(arg, tvp) 207 char *arg; 208 struct timeval *tvp; 209 { 210 struct tm *t; 211 time_t tmptime; 212 int yearset; 213 char *p; 214 /* Start with the current time. */ 215 tmptime = tvp[0].tv_sec; 216 if ((t = localtime(&tmptime)) == NULL) 217 err(1, "localtime"); 218 /* [[CC]YY]MMDDhhmm[.SS] */ 219 if ((p = strchr(arg, '.')) == NULL) 220 t->tm_sec = 0; /* Seconds defaults to 0. */ 221 else { 222 if (strlen(p + 1) != 2) 223 goto terr; 224 *p++ = '\0'; 225 t->tm_sec = ATOI2(p); 226 } 227 228 yearset = 0; 229 switch(strlen(arg)) { 230 case 12: /* CCYYMMDDhhmm */ 231 t->tm_year = ATOI2(arg); 232 t->tm_year *= 100; 233 yearset = 1; 234 /* FALLTHOUGH */ 235 case 10: /* YYMMDDhhmm */ 236 if (yearset) { 237 yearset = ATOI2(arg); 238 t->tm_year += yearset; 239 } else { 240 yearset = ATOI2(arg); 241 if (yearset < 69) 242 t->tm_year = yearset + 2000; 243 else 244 t->tm_year = yearset + 1900; 245 } 246 t->tm_year -= TM_YEAR_BASE; /* Convert to UNIX time. */ 247 /* FALLTHROUGH */ 248 case 8: /* MMDDhhmm */ 249 t->tm_mon = ATOI2(arg); 250 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 251 t->tm_mday = ATOI2(arg); 252 t->tm_hour = ATOI2(arg); 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 t->tm_year = ATOI2(arg); 288 289 t->tm_isdst = -1; /* Figure out DST. */ 290 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 291 if (tvp[0].tv_sec == -1) 292 errx(1, 293 "out of range or illegal time specification: MMDDhhmm[yy]"); 294 295 tvp[0].tv_usec = tvp[1].tv_usec = 0; 296 } 297 298 void 299 stime_file(fname, tvp) 300 char *fname; 301 struct timeval *tvp; 302 { 303 struct stat sb; 304 305 if (stat(fname, &sb)) 306 err(1, "%s", fname); 307 TIMESPEC_TO_TIMEVAL(&tvp[0], &sb.st_atimespec); 308 TIMESPEC_TO_TIMEVAL(&tvp[1], &sb.st_mtimespec); 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 __dead void 364 usage() 365 { 366 (void)fprintf(stderr, 367 "usage: touch [-acfhm] [-r file] [-t time] file ...\n"); 368 exit(1); 369 } 370
Indexes created Tue Sep 30 20:09:53 GMT 2025