touch.c revision 1.11
1 /* $NetBSD: touch.c,v 1.11 1995/08/31 22:10:06 jtc 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 1.11 1995/08/31 22:10:06 jtc 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, mflag, ch, fd, len, rval, timeset; 77 char *p; 78 79 setlocale(LC_ALL, ""); 80 81 aflag = cflag = fflag = mflag = timeset = 0; 82 if (gettimeofday(&tv[0], NULL)) 83 err(1, "gettimeofday"); 84 85 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 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 'm': 97 mflag = 1; 98 break; 99 case 'r': 100 timeset = 1; 101 stime_file(optarg, tv); 102 break; 103 case 't': 104 timeset = 1; 105 stime_arg1(optarg, tv); 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argc -= optind; 112 argv += optind; 113 114 /* Default is both -a and -m. */ 115 if (aflag == 0 && mflag == 0) 116 aflag = mflag = 1; 117 118 /* 119 * If no -r or -t flag, at least two operands, the first of which 120 * is an 8 or 10 digit number, use the obsolete time specification. 121 */ 122 if (!timeset && argc > 1) { 123 (void)strtol(argv[0], &p, 10); 124 len = p - argv[0]; 125 if (*p == '\0' && (len == 8 || len == 10)) { 126 timeset = 1; 127 stime_arg2(*argv++, len == 10, tv); 128 } 129 } 130 131 /* Otherwise use the current time of day. */ 132 if (!timeset) 133 tv[1] = tv[0]; 134 135 if (*argv == NULL) 136 usage(); 137 138 for (rval = 0; *argv; ++argv) { 139 /* See if the file exists. */ 140 if (stat(*argv, &sb)) 141 if (!cflag) { 142 /* Create the file. */ 143 fd = open(*argv, 144 O_WRONLY | O_CREAT, DEFFILEMODE); 145 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 146 rval = 1; 147 warn("%s", *argv); 148 continue; 149 } 150 151 /* If using the current time, we're done. */ 152 if (!timeset) 153 continue; 154 } else 155 continue; 156 157 if (!aflag) 158 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 159 if (!mflag) 160 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 161 162 /* Try utimes(2). */ 163 if (!utimes(*argv, tv)) 164 continue; 165 166 /* If the user specified a time, nothing else we can do. */ 167 if (timeset) { 168 rval = 1; 169 warn("%s", *argv); 170 } 171 172 /* 173 * System V and POSIX 1003.1 require that a NULL argument 174 * set the access/modification times to the current time. 175 * The permission checks are different, too, in that the 176 * ability to write the file is sufficient. Take a shot. 177 */ 178 if (!utimes(*argv, NULL)) 179 continue; 180 181 /* Try reading/writing. */ 182 if (rw(*argv, &sb, fflag)) 183 rval = 1; 184 } 185 exit(rval); 186 } 187 188 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 189 190 void 191 stime_arg1(arg, tvp) 192 char *arg; 193 struct timeval *tvp; 194 { 195 struct tm *t; 196 time_t tmptime; 197 int yearset; 198 char *p; 199 /* Start with the current time. */ 200 tmptime = tvp[0].tv_sec; 201 if ((t = localtime(&tmptime)) == NULL) 202 err(1, "localtime"); 203 /* [[CC]YY]MMDDhhmm[.SS] */ 204 if ((p = strchr(arg, '.')) == NULL) 205 t->tm_sec = 0; /* Seconds defaults to 0. */ 206 else { 207 if (strlen(p + 1) != 2) 208 goto terr; 209 *p++ = '\0'; 210 t->tm_sec = ATOI2(p); 211 } 212 213 yearset = 0; 214 switch(strlen(arg)) { 215 case 12: /* CCYYMMDDhhmm */ 216 t->tm_year = ATOI2(arg); 217 t->tm_year *= 100; 218 yearset = 1; 219 /* FALLTHOUGH */ 220 case 10: /* YYMMDDhhmm */ 221 if (yearset) { 222 yearset = ATOI2(arg); 223 t->tm_year += yearset; 224 } else { 225 yearset = ATOI2(arg); 226 if (yearset < 69) 227 t->tm_year = yearset + 2000; 228 else 229 t->tm_year = yearset + 1900; 230 } 231 t->tm_year -= 1900; /* Convert to UNIX time. */ 232 /* FALLTHROUGH */ 233 case 8: /* MMDDhhmm */ 234 t->tm_mon = ATOI2(arg); 235 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 236 t->tm_mday = ATOI2(arg); 237 t->tm_hour = ATOI2(arg); 238 t->tm_min = ATOI2(arg); 239 break; 240 default: 241 goto terr; 242 } 243 244 t->tm_isdst = -1; /* Figure out DST. */ 245 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 246 if (tvp[0].tv_sec == -1) 247 terr: errx(1, 248 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 249 250 tvp[0].tv_usec = tvp[1].tv_usec = 0; 251 } 252 253 void 254 stime_arg2(arg, year, tvp) 255 char *arg; 256 int year; 257 struct timeval *tvp; 258 { 259 struct tm *t; 260 time_t tmptime; 261 /* Start with the current time. */ 262 tmptime = tvp[0].tv_sec; 263 if ((t = localtime(&tmptime)) == NULL) 264 err(1, "localtime"); 265 266 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 267 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 268 t->tm_mday = ATOI2(arg); 269 t->tm_hour = ATOI2(arg); 270 t->tm_min = ATOI2(arg); 271 if (year) 272 t->tm_year = ATOI2(arg); 273 274 t->tm_isdst = -1; /* Figure out DST. */ 275 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 276 if (tvp[0].tv_sec == -1) 277 errx(1, 278 "out of range or illegal time specification: MMDDhhmm[yy]"); 279 280 tvp[0].tv_usec = tvp[1].tv_usec = 0; 281 } 282 283 void 284 stime_file(fname, tvp) 285 char *fname; 286 struct timeval *tvp; 287 { 288 struct stat sb; 289 290 if (stat(fname, &sb)) 291 err(1, "%s", fname); 292 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 293 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 294 } 295 296 int 297 rw(fname, sbp, force) 298 char *fname; 299 struct stat *sbp; 300 int force; 301 { 302 int fd, needed_chmod, rval; 303 u_char byte; 304 305 /* Try regular files and directories. */ 306 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 307 warnx("%s: %s", fname, strerror(EFTYPE)); 308 return (1); 309 } 310 311 needed_chmod = rval = 0; 312 if ((fd = open(fname, O_RDWR, 0)) == -1) { 313 if (!force || chmod(fname, DEFFILEMODE)) 314 goto err; 315 if ((fd = open(fname, O_RDWR, 0)) == -1) 316 goto err; 317 needed_chmod = 1; 318 } 319 320 if (sbp->st_size != 0) { 321 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 322 goto err; 323 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 324 goto err; 325 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 326 goto err; 327 } else { 328 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 329 err: rval = 1; 330 warn("%s", fname); 331 } else if (ftruncate(fd, (off_t)0)) { 332 rval = 1; 333 warn("%s: file modified", fname); 334 } 335 } 336 337 if (close(fd) && rval != 1) { 338 rval = 1; 339 warn("%s", fname); 340 } 341 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 342 rval = 1; 343 warn("%s: permissions modified", fname); 344 } 345 return (rval); 346 } 347 348 __dead void 349 usage() 350 { 351 (void)fprintf(stderr, 352 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 353 exit(1); 354 } 355
Indexes created Tue Sep 30 17:09:57 GMT 2025