usr/src/cmd/touch/touch.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*      Copyright (c) 1987, 1988 Microsoft Corporation  */
  31 /*        All Rights Reserved   */
  32
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <strings.h>
  38 #include <stdlib.h>
  39 #include <ctype.h>
  40 #include <libgen.h>
  41 #include <fcntl.h>
  42 #include <pwd.h>
  43 #include <time.h>
  44 #include <unistd.h>
  45 #include <locale.h>
  46 #include <sys/time.h>
  47 #include <errno.h>
  48
  49 #define BADTIME "bad time specification"
  50
  51 static char     *myname;
  52
  53 static int isnumber(char *);
  54 static int atoi_for2(char *);
  55 static void usage(const int);
  56 static void touchabort(const char *);
  57 static void parse_datetime(char *, timespec_t *);
  58 static void parse_time(char *, timespec_t *);
  59 static void parse_timespec(char *, timespec_t *);
  60
  61 int
  62 main(int argc, char *argv[])
  63 {
  64         int c;
  65
  66         int             aflag   = 0;
  67         int             cflag   = 0;
  68         int             rflag   = 0;
  69         int             mflag   = 0;
  70         int             tflag   = 0;
  71         int             stflag  = 0;
  72         int             status  = 0;
  73         int             usecurrenttime = 1;
  74         int             timespecified;
  75         int             optc;
  76         int             fd = -1;
  77         mode_t          cmode =
  78             (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
  79         struct stat     stbuf;
  80         struct stat     prstbuf;
  81         timespec_t      times[2];
  82         timespec_t      *tsp;
  83
  84         (void) setlocale(LC_ALL, "");
  85 #if !defined(TEXT_DOMAIN)
  86 #define TEXT_DOMAIN "SYS_TEST"
  87 #endif
  88         (void) textdomain(TEXT_DOMAIN);
  89
  90         myname = basename(argv[0]);
  91         if (strcmp(myname, "settime") == 0) {
  92                 cflag++;
  93                 stflag++;
  94                 while ((optc = getopt(argc, argv, "f:")) != EOF) {
  95                         switch (optc) {
  96                         case 'f':
  97                                 rflag++;
  98                                 usecurrenttime = 0;
  99                                 if (stat(optarg, &prstbuf) == -1) {
 100                                         (void) fprintf(stderr, "%s: ", myname);
 101                                         perror(optarg);
 102                                         return (2);
 103                                 }
 104                                 break;
 105                         case '?':
 106                                 usage(stflag);
 107                                 break;
 108                         }
 109                 }
 110         } else {
 111                 while ((optc = getopt(argc, argv, "acfmr:d:t:")) != EOF) {
 112                         switch (optc) {
 113                         case 'a':
 114                                 aflag++;
 115                                 break;
 116                         case 'c':
 117                                 cflag++;
 118                                 break;
 119                         case 'f':       /* silently ignore for UCB compat */
 120                                 break;
 121                         case 'm':
 122                                 mflag++;
 123                                 break;
 124                         case 'r':       /* same as settime's -f option */
 125                                 rflag++;
 126                                 usecurrenttime = 0;
 127                                 if (stat(optarg, &prstbuf) == -1) {
 128                                         (void) fprintf(stderr, "%s: ", myname);
 129                                         perror(optarg);
 130                                         return (2);
 131                                 }
 132                                 break;
 133                         case 'd':
 134                                 tflag++;
 135                                 usecurrenttime = 0;
 136                                 parse_datetime(optarg, &prstbuf.st_mtim);
 137                                 prstbuf.st_atim = prstbuf.st_mtim;
 138                                 break;
 139                         case 't':
 140                                 tflag++;
 141                                 usecurrenttime = 0;
 142                                 parse_time(optarg, &prstbuf.st_mtim);
 143                                 prstbuf.st_atim = prstbuf.st_mtim;
 144                                 break;
 145                         case '?':
 146                                 usage(stflag);
 147                                 break;
 148                         }
 149                 }
 150         }
 151
 152         argc -= optind;
 153         argv += optind;
 154
 155         if ((argc < 1) || (rflag + tflag > 1))
 156                 usage(stflag);
 157
 158         if ((aflag == 0) && (mflag == 0)) {
 159                 aflag = 1;
 160                 mflag = 1;
 161         }
 162         if ((aflag && !mflag) || (mflag && !aflag))
 163                 usecurrenttime = 0;
 164
 165         /*
 166          * If -r, -t or -d has been specified,
 167          * use the specified time.
 168          */
 169         timespecified = (rflag | tflag);
 170
 171         if (timespecified == 0 && argc >= 2 && isnumber(*argv) &&
 172             (strlen(*argv) == 8 || strlen(*argv) == 10)) {
 173                 /*
 174                  * time is specified as an operand; use it.
 175                  */
 176                 parse_timespec(*argv++, &prstbuf.st_mtim);
 177                 prstbuf.st_atim = prstbuf.st_mtim;
 178                 usecurrenttime = 0;
 179                 timespecified = 1;
 180                 argc--;
 181         }
 182
 183         for (c = 0; c < argc; c++) {
 184                 if (stat(argv[c], &stbuf)) {
 185                         /*
 186                          * If stat failed for reasons other than EOVERFLOW or
 187                          * ENOENT, the file should not be created, since this
 188                          * can clobber the contents of an existing file.
 189                          */
 190                         if (errno == EOVERFLOW) {
 191                                 /*
 192                                  * Since we have EOVERFLOW,
 193                                  * we know the file exists.
 194                                  */
 195                                 /* EMPTY */;
 196                         } else if (errno != ENOENT) {
 197                                 (void) fprintf(stderr,
 198                                     gettext("%s: cannot stat %s: %s\n"),
 199                                     myname, argv[c], strerror(errno));
 200                                 status++;
 201                                 continue;
 202                         } else if (cflag) {
 203                                 continue;
 204                         } else if ((fd = creat(argv[c], cmode)) < 0) {
 205                                 (void) fprintf(stderr,
 206                                     gettext("%s: cannot create %s: %s\n"),
 207                                     myname, argv[c], strerror(errno));
 208                                 status++;
 209                                 continue;
 210                         }
 211                 }
 212
 213                 if (usecurrenttime) {
 214                         tsp = NULL;
 215                 } else {
 216                         if (mflag == 0) {
 217                                 /* Keep the mtime of the file */
 218                                 times[1].tv_nsec = UTIME_OMIT;
 219                         } else if (timespecified) {
 220                                 /* Set the specified time */
 221                                 times[1] = prstbuf.st_mtim;
 222                         } else {
 223                                 /* Otherwise, use the current time */
 224                                 times[1].tv_nsec = UTIME_NOW;
 225                         }
 226
 227                         if (aflag == 0) {
 228                                 /* Keep the atime of the file */
 229                                 times[0].tv_nsec = UTIME_OMIT;
 230                         } else if (timespecified) {
 231                                 /* Set the specified time */
 232                                 times[0] = prstbuf.st_atim;
 233                         } else {
 234                                 /* Otherwise, use the current time */
 235                                 times[0].tv_nsec = UTIME_NOW;
 236                         }
 237
 238                         tsp = times;
 239                 }
 240
 241                 if ((fd >= 0 && futimens(fd, tsp) != 0) ||
 242                     (fd < 0 && utimensat(AT_FDCWD, argv[c], tsp, 0) != 0)) {
 243                         (void) fprintf(stderr,
 244                             gettext("%s: cannot change times on %s: %s\n"),
 245                             myname, argv[c], strerror(errno));
 246                         status++;
 247                 }
 248                 if (fd >= 0) {
 249                         (void) close(fd);
 250                         fd = -1;
 251                 }
 252         }
 253         return (status);
 254 }
 255
 256 static int
 257 isnumber(char *s)
 258 {
 259         int c;
 260
 261         while ((c = *s++) != '\0')
 262                 if (!isdigit(c))
 263                         return (0);
 264         return (1);
 265 }
 266
 267 static void
 268 parse_datetime(char *t, timespec_t *ts)
 269 {
 270         char            date[64];
 271         char            *year;
 272         char            *month;
 273         char            *day;
 274         char            *hour;
 275         char            *minute;
 276         char            *second;
 277         char            *fraction;
 278         int             utc = 0;
 279         char            *p;
 280         time_t          when;
 281         int             nanoseconds;
 282         struct tm       tm;
 283
 284         /*
 285          * The date string has the format (defined by the touch(1) spec):
 286          *      YYYY-MM-DDThh:mm:SS[.frac][tz]
 287          *      YYYY-MM-DDThh:mm:SS[,frac][tz]
 288          * T is either the literal 'T' or is a space character.
 289          * tz is either empty (local time) or the literal 'Z' (UTC).
 290          * All other fields are strings of digits.
 291          */
 292
 293         /*
 294          * Make a copy of the date string so it can be tokenized.
 295          */
 296         if (strlcpy(date, t, sizeof (date)) >= sizeof (date))
 297                 touchabort(BADTIME);
 298
 299         /* deal with the optional trailing 'Z' first */
 300         p = date + strlen(date) - 1;
 301         if (*p == 'Z') {
 302                 utc = 1;
 303                 *p = '\0';
 304         }
 305
 306         /* break out the component tokens */
 307         p = date;
 308         year = strsep(&p, "-");
 309         month = strsep(&p, "-");
 310         day = strsep(&p, "T ");
 311         hour = strsep(&p, ":");
 312         minute = strsep(&p, ":");
 313         second = strsep(&p, ".,");
 314         fraction = p;
 315
 316         /* verify the component tokens */
 317         if (year == NULL || strlen(year) < 4 || !isnumber(year) ||
 318             month == NULL || strlen(month) != 2 || !isnumber(month) ||
 319             day == NULL || strlen(day) != 2 || !isnumber(day) ||
 320             hour == NULL || strlen(hour) != 2 || !isnumber(hour) ||
 321             minute == NULL || strlen(minute) != 2 || !isnumber(minute) ||
 322             second == NULL || strlen(second) != 2 || !isnumber(second) ||
 323             (fraction != NULL && (*fraction == '\0' || !isnumber(fraction))))
 324                 touchabort(BADTIME);
 325
 326         (void) memset(&tm, 0, sizeof (struct tm));
 327
 328         tm.tm_year = atoi(year) - 1900;
 329         tm.tm_mon = atoi(month) - 1;
 330         tm.tm_mday = atoi(day);
 331         tm.tm_hour = atoi(hour);
 332         tm.tm_min = atoi(minute);
 333         tm.tm_sec = atoi(second);
 334         if (utc) {
 335                 (void) setenv("TZ", "GMT0", 1);
 336                 tzset();
 337         }
 338
 339         errno = 0;
 340         if ((when = mktime(&tm)) == -1 && errno != 0)
 341                 touchabort(BADTIME);
 342         if (tm.tm_isdst)
 343                 when -= (timezone - altzone);
 344
 345         if (fraction == NULL) {
 346                 nanoseconds = 0;
 347         } else {
 348                 /* truncate beyond 9 digits (nanoseconds) */
 349                 if (strlen(fraction) > 9)
 350                         fraction[9] = '\0';
 351                 nanoseconds = atoi(fraction);
 352
 353                 switch (strlen(fraction)) {
 354                 case 1:
 355                         nanoseconds *= 100000000;
 356                         break;
 357                 case 2:
 358                         nanoseconds *= 10000000;
 359                         break;
 360                 case 3:
 361                         nanoseconds *= 1000000;
 362                         break;
 363                 case 4:
 364                         nanoseconds *= 100000;
 365                         break;
 366                 case 5:
 367                         nanoseconds *= 10000;
 368                         break;
 369                 case 6:
 370                         nanoseconds *= 1000;
 371                         break;
 372                 case 7:
 373                         nanoseconds *= 100;
 374                         break;
 375                 case 8:
 376                         nanoseconds *= 10;
 377                         break;
 378                 case 9:
 379                         break;
 380                 }
 381         }
 382
 383         ts->tv_sec = when;
 384         ts->tv_nsec = nanoseconds;
 385 }
 386
 387 static void
 388 parse_time(char *t, timespec_t *ts)
 389 {
 390         int             century = 0;
 391         int             seconds = 0;
 392         char            *p;
 393         time_t          when;
 394         struct tm       tm;
 395
 396         /*
 397          * time in the following format (defined by the touch(1) spec):
 398          *      [[CC]YY]MMDDhhmm[.SS]
 399          */
 400         if ((p = strchr(t, '.')) != NULL) {
 401                 if (strchr(p+1, '.') != NULL)
 402                         touchabort(BADTIME);
 403                 seconds = atoi_for2(p+1);
 404                 *p = '\0';
 405         }
 406
 407         (void) memset(&tm, 0, sizeof (struct tm));
 408         when = time(0);
 409         tm.tm_year = localtime(&when)->tm_year;
 410
 411         switch (strlen(t)) {
 412                 case 12:        /* CCYYMMDDhhmm */
 413                         century = atoi_for2(t);
 414                         t += 2;
 415                         /* FALLTHROUGH */
 416                 case 10:        /* YYMMDDhhmm */
 417                         tm.tm_year = atoi_for2(t);
 418                         t += 2;
 419                         if (century == 0) {
 420                                 if (tm.tm_year < 69)
 421                                         tm.tm_year += 100;
 422                         } else
 423                                 tm.tm_year += (century - 19) * 100;
 424                         /* FALLTHROUGH */
 425                 case 8:         /* MMDDhhmm */
 426                         tm.tm_mon = atoi_for2(t) - 1;
 427                         t += 2;
 428                         tm.tm_mday = atoi_for2(t);
 429                         t += 2;
 430                         tm.tm_hour = atoi_for2(t);
 431                         t += 2;
 432                         tm.tm_min = atoi_for2(t);
 433                         tm.tm_sec = seconds;
 434                         break;
 435                 default:
 436                         touchabort(BADTIME);
 437         }
 438
 439         if ((when = mktime(&tm)) == -1)
 440                 touchabort(BADTIME);
 441         if (tm.tm_isdst)
 442                 when -= (timezone-altzone);
 443
 444         ts->tv_sec = when;
 445         ts->tv_nsec = 0;
 446 }
 447
 448 static void
 449 parse_timespec(char *t, timespec_t *ts)
 450 {
 451         time_t          when;
 452         struct tm       tm;
 453
 454         /*
 455          * time in the following format (defined by the touch(1) spec):
 456          *      MMDDhhmm[yy]
 457          */
 458
 459         (void) memset(&tm, 0, sizeof (struct tm));
 460         when = time(0);
 461         tm.tm_year = localtime(&when)->tm_year;
 462
 463         switch (strlen(t)) {
 464                 case 10:        /* MMDDhhmmyy */
 465                         tm.tm_year = atoi_for2(t+8);
 466                         if (tm.tm_year < 69)
 467                                 tm.tm_year += 100;
 468                         /* FALLTHROUGH */
 469                 case 8:         /* MMDDhhmm */
 470                         tm.tm_mon = atoi_for2(t) - 1;
 471                         t += 2;
 472                         tm.tm_mday = atoi_for2(t);
 473                         t += 2;
 474                         tm.tm_hour = atoi_for2(t);
 475                         t += 2;
 476                         tm.tm_min = atoi_for2(t);
 477                         break;
 478                 default:
 479                         touchabort(BADTIME);
 480         }
 481
 482         if ((when = mktime(&tm)) == -1)
 483                 touchabort(BADTIME);
 484         if (tm.tm_isdst)
 485                 when -= (timezone - altzone);
 486
 487         ts->tv_sec = when;
 488         ts->tv_nsec = 0;
 489 }
 490
 491 static int
 492 atoi_for2(char *p)
 493 {
 494         int value;
 495
 496         value = (*p - '0') * 10 + *(p+1) - '0';
 497         if ((value < 0) || (value > 99))
 498                 touchabort(BADTIME);
 499         return (value);
 500 }
 501
 502 static void
 503 touchabort(const char *message)
 504 {
 505         (void) fprintf(stderr, "%s: %s\n", myname, gettext(message));
 506         exit(1);
 507 }
 508
 509 static void
 510 usage(const int settime)
 511 {
 512         if (settime) {
 513                 (void) fprintf(stderr, gettext(
 514                     "usage: %s [-f file] [mmddhhmm[yy]] file...\n"), myname);
 515                 exit(2);
 516         }
 517         (void) fprintf(stderr, gettext(
 518             "usage: %s [-acm] [-r ref_file] file...\n"
 519             "       %s [-acm] [-t [[CC]YY]MMDDhhmm[.SS]] file...\n"
 520             "       %s [-acm] [-d YYYY-MM-DDThh:mm:SS[.frac][Z]] file...\n"
 521             "       %s [-acm] [-d YYYY-MM-DDThh:mm:SS[,frac][Z]] file...\n"
 522             "       %s [-acm] [MMDDhhmm[yy]] file...\n"),
 523             myname, myname, myname, myname, myname);
 524         exit(2);
 525 }