touch/touch.c

   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 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD: src/usr.bin/touch/touch.c,v 1.25 2010/03/28 13:16:08 ed Exp $");
  37
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)touch.c       8.1 (Berkeley) 6/6/93";
  46 #endif
  47
  48 #include <sys/types.h>
  49 #include <sys/stat.h>
  50 #include <sys/time.h>
  51
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <fcntl.h>
  55 #include <libgen.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <time.h>
  60 #include <unistd.h>
  61
  62 int     rw(char *, struct stat *, int);
  63 void    stime_arg1(char *, struct timeval *);
  64 void    stime_arg2(char *, int, struct timeval *);
  65 void    stime_file(char *, struct timeval *);
  66 int     timeoffset(char *);
  67 void    usage(char *);
  68
  69 int
  70 main(int argc, char *argv[])
  71 {
  72         struct stat sb;
  73         struct timeval tv[2];
  74         int (*stat_f)(const char *, struct stat *);
  75         int (*utimes_f)(const char *, const struct timeval *);
  76         int Aflag, aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
  77         char *p;
  78         char *myname;
  79
  80         myname = basename(argv[0]);
  81         Aflag = aflag = cflag = fflag = mflag = timeset = 0;
  82         stat_f = stat;
  83         utimes_f = utimes;
  84         if (gettimeofday(&tv[0], NULL))
  85                 err(1, "gettimeofday");
  86
  87         while ((ch = getopt(argc, argv, "A:acfhmr:t:")) != -1)
  88                 switch(ch) {
  89                 case 'A':
  90                         Aflag = timeoffset(optarg);
  91                         break;
  92                 case 'a':
  93                         aflag = 1;
  94                         break;
  95                 case 'c':
  96                         cflag = 1;
  97                         break;
  98                 case 'f':
  99                         fflag = 1;
 100                         break;
 101                 case 'h':
 102                         cflag = 1;
 103                         stat_f = lstat;
 104                         utimes_f = lutimes;
 105                         break;
 106                 case 'm':
 107                         mflag = 1;
 108                         break;
 109                 case 'r':
 110                         timeset = 1;
 111                         stime_file(optarg, tv);
 112                         break;
 113                 case 't':
 114                         timeset = 1;
 115                         stime_arg1(optarg, tv);
 116                         break;
 117                 case '?':
 118                 default:
 119                         usage(myname);
 120                 }
 121         argc -= optind;
 122         argv += optind;
 123
 124         if (aflag == 0 && mflag == 0)
 125                 aflag = mflag = 1;
 126
 127         if (timeset) {
 128                 if (Aflag) {
 129                         /*
 130                          * We're setting the time to an offset from a specified
 131                          * time.  God knows why, but it means that we can set
 132                          * that time once and for all here.
 133                          */
 134                         if (aflag)
 135                                 tv[0].tv_sec += Aflag;
 136                         if (mflag)
 137                                 tv[1].tv_sec += Aflag;
 138                         Aflag = 0;              /* done our job */
 139                 }
 140         } else {
 141                 /*
 142                  * If no -r or -t flag, at least two operands, the first of
 143                  * which is an 8 or 10 digit number, use the obsolete time
 144                  * specification, otherwise use the current time.
 145                  */
 146                 if (argc > 1) {
 147                         strtol(argv[0], &p, 10);
 148                         len = p - argv[0];
 149                         if (*p == '\0' && (len == 8 || len == 10)) {
 150                                 timeset = 1;
 151                                 stime_arg2(*argv++, len == 10, tv);
 152                         }
 153                 }
 154                 /* Both times default to the same. */
 155                 tv[1] = tv[0];
 156         }
 157
 158         if (*argv == NULL)
 159                 usage(myname);
 160
 161         if (Aflag)
 162                 cflag = 1;
 163
 164         for (rval = 0; *argv; ++argv) {
 165                 /* See if the file exists. */
 166                 if (stat_f(*argv, &sb) != 0) {
 167                         if (errno != ENOENT) {
 168                                 rval = 1;
 169                                 warn("%s", *argv);
 170                                 continue;
 171                         }
 172                         if (!cflag) {
 173                                 /* Create the file. */
 174                                 fd = open(*argv,
 175                                     O_WRONLY | O_CREAT, DEFFILEMODE);
 176                                 if (fd == -1 || fstat(fd, &sb) || close(fd)) {
 177                                         rval = 1;
 178                                         warn("%s", *argv);
 179                                         continue;
 180                                 }
 181
 182                                 /* If using the current time, we're done. */
 183                                 if (!timeset)
 184                                         continue;
 185                         } else
 186                                 continue;
 187                 }
 188
 189                 if (!aflag)
 190                         TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
 191                 if (!mflag)
 192                         TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
 193
 194                 /*
 195                  * We're adjusting the times based on the file times, not a
 196                  * specified time (that gets handled above).
 197                  */
 198                 if (Aflag) {
 199                         if (aflag) {
 200                                 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
 201                                 tv[0].tv_sec += Aflag;
 202                         }
 203                         if (mflag) {
 204                                 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
 205                                 tv[1].tv_sec += Aflag;
 206                         }
 207                 }
 208
 209                 /* Try utimes(2). */
 210                 if (!utimes_f(*argv, tv))
 211                         continue;
 212
 213                 /* If the user specified a time, nothing else we can do. */
 214                 if (timeset || Aflag) {
 215                         rval = 1;
 216                         warn("%s", *argv);
 217                         continue;
 218                 }
 219
 220                 /*
 221                  * System V and POSIX 1003.1 require that a NULL argument
 222                  * set the access/modification times to the current time.
 223                  * The permission checks are different, too, in that the
 224                  * ability to write the file is sufficient.  Take a shot.
 225                  */
 226                  if (!utimes_f(*argv, NULL))
 227                         continue;
 228
 229                 /* Try reading/writing. */
 230                 if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode)) {
 231                         if (rw(*argv, &sb, fflag))
 232                                 rval = 1;
 233                 } else {
 234                         rval = 1;
 235                         warn("%s", *argv);
 236                 }
 237         }
 238         exit(rval);
 239 }
 240
 241 #define ATOI2(ar)       ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
 242
 243 void
 244 stime_arg1(char *arg, struct timeval *tvp)
 245 {
 246         time_t now;
 247         struct tm *t;
 248         int yearset;
 249         char *p;
 250                                         /* Start with the current time. */
 251         now = tvp[0].tv_sec;
 252         if ((t = localtime(&now)) == NULL)
 253                 err(1, "localtime");
 254                                         /* [[CC]YY]MMDDhhmm[.SS] */
 255         if ((p = strchr(arg, '.')) == NULL)
 256                 t->tm_sec = 0;          /* Seconds defaults to 0. */
 257         else {
 258                 if (strlen(p + 1) != 2)
 259                         goto terr;
 260                 *p++ = '\0';
 261                 t->tm_sec = ATOI2(p);
 262         }
 263
 264         yearset = 0;
 265         switch(strlen(arg)) {
 266         case 12:                        /* CCYYMMDDhhmm */
 267                 t->tm_year = ATOI2(arg);
 268                 t->tm_year *= 100;
 269                 yearset = 1;
 270                 /* FALLTHROUGH */
 271         case 10:                        /* YYMMDDhhmm */
 272                 if (yearset) {
 273                         yearset = ATOI2(arg);
 274                         t->tm_year += yearset;
 275                 } else {
 276                         yearset = ATOI2(arg);
 277                         if (yearset < 69)
 278                                 t->tm_year = yearset + 2000;
 279                         else
 280                                 t->tm_year = yearset + 1900;
 281                 }
 282                 t->tm_year -= 1900;     /* Convert to UNIX time. */
 283                 /* FALLTHROUGH */
 284         case 8:                         /* MMDDhhmm */
 285                 t->tm_mon = ATOI2(arg);
 286                 --t->tm_mon;            /* Convert from 01-12 to 00-11 */
 287                 t->tm_mday = ATOI2(arg);
 288                 t->tm_hour = ATOI2(arg);
 289                 t->tm_min = ATOI2(arg);
 290                 break;
 291         default:
 292                 goto terr;
 293         }
 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 terr:           errx(1,
 299         "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
 300
 301         tvp[0].tv_usec = tvp[1].tv_usec = 0;
 302 }
 303
 304 void
 305 stime_arg2(char *arg, int year, struct timeval *tvp)
 306 {
 307         time_t now;
 308         struct tm *t;
 309                                         /* Start with the current time. */
 310         now = tvp[0].tv_sec;
 311         if ((t = localtime(&now)) == NULL)
 312                 err(1, "localtime");
 313
 314         t->tm_mon = ATOI2(arg);         /* MMDDhhmm[yy] */
 315         --t->tm_mon;                    /* Convert from 01-12 to 00-11 */
 316         t->tm_mday = ATOI2(arg);
 317         t->tm_hour = ATOI2(arg);
 318         t->tm_min = ATOI2(arg);
 319         if (year) {
 320                 t->tm_year = ATOI2(arg);
 321                 if (t->tm_year < 39)    /* support 2000-2038 not 1902-1969 */
 322                         t->tm_year += 100;
 323         }
 324
 325         t->tm_isdst = -1;               /* Figure out DST. */
 326         tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
 327         if (tvp[0].tv_sec == -1)
 328                 errx(1,
 329         "out of range or illegal time specification: MMDDhhmm[yy]");
 330
 331         tvp[0].tv_usec = tvp[1].tv_usec = 0;
 332 }
 333
 334 /* Calculate a time offset in seconds, given an arg of the format [-]HHMMSS. */
 335 int
 336 timeoffset(char *arg)
 337 {
 338         int offset;
 339         int isneg;
 340
 341         offset = 0;
 342         isneg = *arg == '-';
 343         if (isneg)
 344                 arg++;
 345         switch (strlen(arg)) {
 346         default:                                /* invalid */
 347                 errx(1, "Invalid offset spec, must be [-][[HH]MM]SS");
 348
 349         case 6:                                 /* HHMMSS */
 350                 offset = ATOI2(arg);
 351                 /* FALLTHROUGH */
 352         case 4:                                 /* MMSS */
 353                 offset = offset * 60 + ATOI2(arg);
 354                 /* FALLTHROUGH */
 355         case 2:                                 /* SS */
 356                 offset = offset * 60 + ATOI2(arg);
 357         }
 358         if (isneg)
 359                 return (-offset);
 360         else
 361                 return (offset);
 362 }
 363
 364 void
 365 stime_file(char *fname, struct timeval *tvp)
 366 {
 367         struct stat sb;
 368
 369         if (stat(fname, &sb))
 370                 err(1, "%s", fname);
 371         TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
 372         TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
 373 }
 374
 375 int
 376 rw(char *fname, struct stat *sbp, int force)
 377 {
 378         int fd, needed_chmod, rval;
 379         u_char byte;
 380
 381         /* Try regular files. */
 382         if (!S_ISREG(sbp->st_mode)) {
 383                 warnx("%s: %s", fname, strerror(EFTYPE));
 384                 return (1);
 385         }
 386
 387         needed_chmod = rval = 0;
 388         if ((fd = open(fname, O_RDWR, 0)) == -1) {
 389                 if (!force || chmod(fname, DEFFILEMODE))
 390                         goto err;
 391                 if ((fd = open(fname, O_RDWR, 0)) == -1)
 392                         goto err;
 393                 needed_chmod = 1;
 394         }
 395
 396         if (sbp->st_size != 0) {
 397                 if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
 398                         goto err;
 399                 if (lseek(fd, (off_t)0, SEEK_SET) == -1)
 400                         goto err;
 401                 if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
 402                         goto err;
 403         } else {
 404                 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
 405 err:                    rval = 1;
 406                         warn("%s", fname);
 407                 } else if (ftruncate(fd, (off_t)0)) {
 408                         rval = 1;
 409                         warn("%s: file modified", fname);
 410                 }
 411         }
 412
 413         if (close(fd) && rval != 1) {
 414                 rval = 1;
 415                 warn("%s", fname);
 416         }
 417         if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
 418                 rval = 1;
 419                 warn("%s: permissions modified", fname);
 420         }
 421         return (rval);
 422 }
 423
 424 void
 425 usage(char *myname)
 426 {
 427         fprintf(stderr, "usage:\n" "%s [-A [-][[hh]mm]SS] [-acfhm] [-r file] "
 428                 "[-t [[CC]YY]MMDDhhmm[.SS]] file ...\n", myname);
 429         exit(1);
 430 }