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 __RCSID("$FreeBSD: src/usr.bin/touch/touch.c,v 1.20 2002/09/04 23:29:07 dwmalone 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 <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <time.h>
  59 #include <unistd.h>
  60
  61 int     rw(char *, struct stat *, int);
  62 void    stime_arg1(char *, struct timeval *);
  63 void    stime_arg2(char *, int, struct timeval *);
  64 void    stime_file(char *, struct timeval *);
  65 void    usage(void);
  66
  67 int
  68 main(int argc, char *argv[])
  69 {
  70         struct stat sb;
  71         struct timeval tv[2];
  72         int (*stat_f)(const char *, struct stat *);
  73         int (*utimes_f)(const char *, const struct timeval *);
  74         int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
  75         char *p;
  76
  77         aflag = cflag = fflag = mflag = timeset = 0;
  78         stat_f = stat;
  79         utimes_f = utimes;
  80         if (gettimeofday(&tv[0], NULL))
  81                 err(1, "gettimeofday");
  82
  83         while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1)
  84                 switch(ch) {
  85                 case 'a':
  86                         aflag = 1;
  87                         break;
  88                 case 'c':
  89                         cflag = 1;
  90                         break;
  91                 case 'f':
  92                         fflag = 1;
  93                         break;
  94 #ifndef __APPLE__
  95                 case 'h':
  96                         cflag = 1;
  97                         stat_f = lstat;
  98                         utimes_f = lutimes;
  99                         break;
 100 #endif /* __APPLE__ */
 101                 case 'm':
 102                         mflag = 1;
 103                         break;
 104                 case 'r':
 105                         timeset = 1;
 106                         stime_file(optarg, tv);
 107                         break;
 108                 case 't':
 109                         timeset = 1;
 110                         stime_arg1(optarg, tv);
 111                         break;
 112                 case '?':
 113                 default:
 114                         usage();
 115                 }
 116         argc -= optind;
 117         argv += optind;
 118
 119         /* Default is both -a and -m. */
 120         if (aflag == 0 && mflag == 0)
 121                 aflag = mflag = 1;
 122
 123         /*
 124          * If no -r or -t flag, at least two operands, the first of which
 125          * is an 8 or 10 digit number, use the obsolete time specification.
 126          */
 127         if (!timeset && argc > 1) {
 128                 (void)strtol(argv[0], &p, 10);
 129                 len = p - argv[0];
 130                 if (*p == '\0' && (len == 8 || len == 10)) {
 131                         timeset = 1;
 132                         stime_arg2(*argv++, len == 10, tv);
 133                 }
 134         }
 135
 136         /* Otherwise use the current time of day. */
 137         if (!timeset)
 138                 tv[1] = tv[0];
 139
 140         if (*argv == NULL)
 141                 usage();
 142
 143         for (rval = 0; *argv; ++argv) {
 144                 /* See if the file exists. */
 145                 if (stat_f(*argv, &sb) != 0) {
 146                         if (!cflag) {
 147                                 /* Create the file. */
 148                                 fd = open(*argv,
 149                                     O_WRONLY | O_CREAT, DEFFILEMODE);
 150                                 if (fd == -1 || fstat(fd, &sb) || close(fd)) {
 151                                         rval = 1;
 152                                         warn("%s", *argv);
 153                                         continue;
 154                                 }
 155
 156                                 /* If using the current time, we're done. */
 157                                 if (!timeset)
 158                                         continue;
 159                         } else
 160                                 continue;
 161                 }
 162
 163                 if (!aflag)
 164                         TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
 165                 if (!mflag)
 166                         TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
 167
 168                 /* Try utimes(2). */
 169                 if (!utimes_f(*argv, tv))
 170                         continue;
 171
 172                 /* If the user specified a time, nothing else we can do. */
 173                 if (timeset) {
 174                         rval = 1;
 175                         warn("%s", *argv);
 176                 }
 177
 178                 /*
 179                  * System V and POSIX 1003.1 require that a NULL argument
 180                  * set the access/modification times to the current time.
 181                  * The permission checks are different, too, in that the
 182                  * ability to write the file is sufficient.  Take a shot.
 183                  */
 184                  if (!utimes_f(*argv, NULL))
 185                         continue;
 186
 187                 /* Try reading/writing. */
 188                 if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode) &&
 189                     rw(*argv, &sb, fflag))
 190                         rval = 1;
 191                 else
 192                         warn("%s", *argv);
 193         }
 194         exit(rval);
 195 }
 196
 197 #define ATOI2(ar)       ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
 198
 199 void
 200 stime_arg1(char *arg, struct timeval *tvp)
 201 {
 202         time_t now;
 203         struct tm *t;
 204         int yearset;
 205         char *p;
 206                                         /* Start with the current time. */
 207         now = tvp[0].tv_sec;
 208         if ((t = localtime(&now)) == NULL)
 209                 err(1, "localtime");
 210                                         /* [[CC]YY]MMDDhhmm[.SS] */
 211         if ((p = strchr(arg, '.')) == NULL)
 212                 t->tm_sec = 0;          /* Seconds defaults to 0. */
 213         else {
 214                 if (strlen(p + 1) != 2)
 215                         goto terr;
 216                 *p++ = '\0';
 217                 t->tm_sec = ATOI2(p);
 218         }
 219
 220         yearset = 0;
 221         switch(strlen(arg)) {
 222         case 12:                        /* CCYYMMDDhhmm */
 223                 t->tm_year = ATOI2(arg);
 224                 t->tm_year *= 100;
 225                 yearset = 1;
 226                 /* FALLTHROUGH */
 227         case 10:                        /* YYMMDDhhmm */
 228                 if (yearset) {
 229                         yearset = ATOI2(arg);
 230                         t->tm_year += yearset;
 231                 } else {
 232                         yearset = ATOI2(arg);
 233                         if (yearset < 69)
 234                                 t->tm_year = yearset + 2000;
 235                         else
 236                                 t->tm_year = yearset + 1900;
 237                 }
 238                 t->tm_year -= 1900;     /* Convert to UNIX time. */
 239                 /* FALLTHROUGH */
 240         case 8:                         /* MMDDhhmm */
 241                 t->tm_mon = ATOI2(arg);
 242                 --t->tm_mon;            /* Convert from 01-12 to 00-11 */
 243                 t->tm_mday = ATOI2(arg);
 244                 t->tm_hour = ATOI2(arg);
 245                 t->tm_min = ATOI2(arg);
 246                 break;
 247         default:
 248                 goto terr;
 249         }
 250
 251         t->tm_isdst = -1;               /* Figure out DST. */
 252         tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
 253         if (tvp[0].tv_sec == -1)
 254 terr:           errx(1,
 255         "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
 256
 257         tvp[0].tv_usec = tvp[1].tv_usec = 0;
 258 }
 259
 260 void
 261 stime_arg2(char *arg, int year, struct timeval *tvp)
 262 {
 263         time_t now;
 264         struct tm *t;
 265                                         /* Start with the current time. */
 266         now = tvp[0].tv_sec;
 267         if ((t = localtime(&now)) == NULL)
 268                 err(1, "localtime");
 269
 270         t->tm_mon = ATOI2(arg);         /* MMDDhhmm[yy] */
 271         --t->tm_mon;                    /* Convert from 01-12 to 00-11 */
 272         t->tm_mday = ATOI2(arg);
 273         t->tm_hour = ATOI2(arg);
 274         t->tm_min = ATOI2(arg);
 275         if (year) {
 276                 t->tm_year = ATOI2(arg);
 277                 if (t->tm_year < 39)    /* support 2000-2038 not 1902-1969 */
 278                         t->tm_year += 100;
 279         }
 280
 281         t->tm_isdst = -1;               /* Figure out DST. */
 282         tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
 283         if (tvp[0].tv_sec == -1)
 284                 errx(1,
 285         "out of range or illegal time specification: MMDDhhmm[yy]");
 286
 287         tvp[0].tv_usec = tvp[1].tv_usec = 0;
 288 }
 289
 290 void
 291 stime_file(char *fname, struct timeval *tvp)
 292 {
 293         struct stat sb;
 294
 295         if (stat(fname, &sb))
 296                 err(1, "%s", fname);
 297         TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
 298         TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
 299 }
 300
 301 int
 302 rw(char *fname, struct stat *sbp, int force)
 303 {
 304         int fd, needed_chmod, rval;
 305         u_char byte;
 306
 307         /* Try regular files. */
 308         if (!S_ISREG(sbp->st_mode)) {
 309                 warnx("%s: %s", fname, strerror(EFTYPE));
 310                 return (1);
 311         }
 312
 313         needed_chmod = rval = 0;
 314         if ((fd = open(fname, O_RDWR, 0)) == -1) {
 315                 if (!force || chmod(fname, DEFFILEMODE))
 316                         goto err;
 317                 if ((fd = open(fname, O_RDWR, 0)) == -1)
 318                         goto err;
 319                 needed_chmod = 1;
 320         }
 321
 322         if (sbp->st_size != 0) {
 323                 if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
 324                         goto err;
 325                 if (lseek(fd, (off_t)0, SEEK_SET) == -1)
 326                         goto err;
 327                 if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
 328                         goto err;
 329         } else {
 330                 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
 331 err:                    rval = 1;
 332                         warn("%s", fname);
 333                 } else if (ftruncate(fd, (off_t)0)) {
 334                         rval = 1;
 335                         warn("%s: file modified", fname);
 336                 }
 337         }
 338
 339         if (close(fd) && rval != 1) {
 340                 rval = 1;
 341                 warn("%s", fname);
 342         }
 343         if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
 344                 rval = 1;
 345                 warn("%s: permissions modified", fname);
 346         }
 347         return (rval);
 348 }
 349
 350 void
 351 usage(void)
 352 {
 353         (void)fprintf(stderr, "usage: touch [-acfhm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...\n");
 354         exit(1);
 355 }