touch.c revision 1.1.1.3
1 /* 2 * Copyright (c) 1993 3 * The Regents of the University of California. 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 static char copyright[] = 36 "@(#) Copyright (c) 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 #include <sys/time.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <time.h> 55 #include <unistd.h> 56 57 int rw __P((char *, struct stat *, int)); 58 void stime_arg1 __P((char *, struct timeval *)); 59 void stime_arg2 __P((char *, int, struct timeval *)); 60 void stime_file __P((char *, struct timeval *)); 61 void usage __P((void)); 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 struct stat sb; 69 struct timeval tv[2]; 70 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 71 char *p; 72 73 aflag = cflag = fflag = mflag = timeset = 0; 74 if (gettimeofday(&tv[0], NULL)) 75 err(1, "gettimeofday"); 76 77 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 78 switch(ch) { 79 case 'a': 80 aflag = 1; 81 break; 82 case 'c': 83 cflag = 1; 84 break; 85 case 'f': 86 fflag = 1; 87 break; 88 case 'm': 89 mflag = 1; 90 break; 91 case 'r': 92 timeset = 1; 93 stime_file(optarg, tv); 94 break; 95 case 't': 96 timeset = 1; 97 stime_arg1(optarg, tv); 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 /* Default is both -a and -m. */ 107 if (aflag == 0 && mflag == 0) 108 aflag = mflag = 1; 109 110 /* 111 * If no -r or -t flag, at least two operands, the first of which 112 * is an 8 or 10 digit number, use the obsolete time specification. 113 */ 114 if (!timeset && argc > 1) { 115 (void)strtol(argv[0], &p, 10); 116 len = p - argv[0]; 117 if (*p == '\0' && (len == 8 || len == 10)) { 118 timeset = 1; 119 stime_arg2(*argv++, len == 10, tv); 120 } 121 } 122 123 /* Otherwise use the current time of day. */ 124 if (!timeset) 125 tv[1] = tv[0]; 126 127 if (*argv == NULL) 128 usage(); 129 130 for (rval = 0; *argv; ++argv) { 131 /* See if the file exists. */ 132 if (stat(*argv, &sb)) 133 if (!cflag) { 134 /* Create the file. */ 135 fd = open(*argv, 136 O_WRONLY | O_CREAT, DEFFILEMODE); 137 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 138 rval = 1; 139 warn("%s", *argv); 140 continue; 141 } 142 143 /* If using the current time, we're done. */ 144 if (!timeset) 145 continue; 146 } else 147 continue; 148 149 if (!aflag) 150 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 151 if (!mflag) 152 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 153 154 /* Try utimes(2). */ 155 if (!utimes(*argv, tv)) 156 continue; 157 158 /* If the user specified a time, nothing else we can do. */ 159 if (timeset) { 160 rval = 1; 161 warn("%s", *argv); 162 } 163 164 /* 165 * System V and POSIX 1003.1 require that a NULL argument 166 * set the access/modification times to the current time. 167 * The permission checks are different, too, in that the 168 * ability to write the file is sufficient. Take a shot. 169 */ 170 if (!utimes(*argv, NULL)) 171 continue; 172 173 /* Try reading/writing. */ 174 if (rw(*argv, &sb, fflag)) 175 rval = 1; 176 } 177 exit(rval); 178 } 179 180 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 181 182 void 183 stime_arg1(arg, tvp) 184 char *arg; 185 struct timeval *tvp; 186 { 187 struct tm *t; 188 int yearset; 189 char *p; 190 /* Start with the current time. */ 191 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 192 err(1, "localtime"); 193 /* [[CC]YY]MMDDhhmm[.SS] */ 194 if ((p = strchr(arg, '.')) == NULL) 195 t->tm_sec = 0; /* Seconds defaults to 0. */ 196 else { 197 if (strlen(p + 1) != 2) 198 goto terr; 199 *p++ = '\0'; 200 t->tm_sec = ATOI2(p); 201 } 202 203 yearset = 0; 204 switch(strlen(arg)) { 205 case 12: /* CCYYMMDDhhmm */ 206 t->tm_year = ATOI2(arg); 207 t->tm_year *= 100; 208 yearset = 1; 209 /* FALLTHOUGH */ 210 case 10: /* YYMMDDhhmm */ 211 if (yearset) { 212 yearset = ATOI2(arg); 213 t->tm_year += yearset; 214 } else { 215 yearset = ATOI2(arg); 216 if (yearset < 69) 217 t->tm_year = yearset + 2000; 218 else 219 t->tm_year = yearset + 1900; 220 } 221 t->tm_year -= 1900; /* Convert to UNIX time. */ 222 /* FALLTHROUGH */ 223 case 8: /* MMDDhhmm */ 224 t->tm_mon = ATOI2(arg); 225 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 226 t->tm_mday = ATOI2(arg); 227 t->tm_hour = ATOI2(arg); 228 t->tm_min = ATOI2(arg); 229 break; 230 default: 231 goto terr; 232 } 233 234 t->tm_isdst = -1; /* Figure out DST. */ 235 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 236 if (tvp[0].tv_sec == -1) 237 terr: errx(1, 238 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 239 240 tvp[0].tv_usec = tvp[1].tv_usec = 0; 241 } 242 243 void 244 stime_arg2(arg, year, tvp) 245 char *arg; 246 int year; 247 struct timeval *tvp; 248 { 249 struct tm *t; 250 /* Start with the current time. */ 251 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 252 err(1, "localtime"); 253 254 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 255 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 256 t->tm_mday = ATOI2(arg); 257 t->tm_hour = ATOI2(arg); 258 t->tm_min = ATOI2(arg); 259 if (year) 260 t->tm_year = ATOI2(arg); 261 262 t->tm_isdst = -1; /* Figure out DST. */ 263 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 264 if (tvp[0].tv_sec == -1) 265 errx(1, 266 "out of range or illegal time specification: MMDDhhmm[yy]"); 267 268 tvp[0].tv_usec = tvp[1].tv_usec = 0; 269 } 270 271 void 272 stime_file(fname, tvp) 273 char *fname; 274 struct timeval *tvp; 275 { 276 struct stat sb; 277 278 if (stat(fname, &sb)) 279 err(1, "%s", fname); 280 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 281 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 282 } 283 284 int 285 rw(fname, sbp, force) 286 char *fname; 287 struct stat *sbp; 288 int force; 289 { 290 int fd, needed_chmod, rval; 291 u_char byte; 292 293 /* Try regular files and directories. */ 294 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 295 warnx("%s: %s", fname, strerror(EFTYPE)); 296 return (1); 297 } 298 299 needed_chmod = rval = 0; 300 if ((fd = open(fname, O_RDWR, 0)) == -1) { 301 if (!force || chmod(fname, DEFFILEMODE)) 302 goto err; 303 if ((fd = open(fname, O_RDWR, 0)) == -1) 304 goto err; 305 needed_chmod = 1; 306 } 307 308 if (sbp->st_size != 0) { 309 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 310 goto err; 311 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 312 goto err; 313 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 314 goto err; 315 } else { 316 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 317 err: rval = 1; 318 warn("%s", fname); 319 } else if (ftruncate(fd, (off_t)0)) { 320 rval = 1; 321 warn("%s: file modified", fname); 322 } 323 } 324 325 if (close(fd) && rval != 1) { 326 rval = 1; 327 warn("%s", fname); 328 } 329 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 330 rval = 1; 331 warn("%s: permissions modified", fname); 332 } 333 return (rval); 334 } 335 336 __dead void 337 usage() 338 { 339 (void)fprintf(stderr, 340 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 341 exit(1); 342 } 343
Indexes created Thu Oct 02 14:10:14 GMT 2025