1 /* 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 04/28/95"; 16 #endif /* not lint */ 17 18 #include <sys/types.h> 19 #include <sys/stat.h> 20 #include <sys/time.h> 21 22 #include <err.h> 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <time.h> 29 #include <unistd.h> 30 31 int rw __P((char *, struct stat *, int)); 32 void stime_arg1 __P((char *, struct timeval *)); 33 void stime_arg2 __P((char *, int, struct timeval *)); 34 void stime_file __P((char *, struct timeval *)); 35 void usage __P((void)); 36 37 int 38 main(argc, argv) 39 int argc; 40 char *argv[]; 41 { 42 struct stat sb; 43 struct timeval tv[2]; 44 int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset; 45 char *p; 46 47 aflag = cflag = fflag = mflag = timeset = 0; 48 if (gettimeofday(&tv[0], NULL)) 49 err(1, "gettimeofday"); 50 51 while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF) 52 switch(ch) { 53 case 'a': 54 aflag = 1; 55 break; 56 case 'c': 57 cflag = 1; 58 break; 59 case 'f': 60 fflag = 1; 61 break; 62 case 'm': 63 mflag = 1; 64 break; 65 case 'r': 66 timeset = 1; 67 stime_file(optarg, tv); 68 break; 69 case 't': 70 timeset = 1; 71 stime_arg1(optarg, tv); 72 break; 73 case '?': 74 default: 75 usage(); 76 } 77 argc -= optind; 78 argv += optind; 79 80 /* Default is both -a and -m. */ 81 if (aflag == 0 && mflag == 0) 82 aflag = mflag = 1; 83 84 /* 85 * If no -r or -t flag, at least two operands, the first of which 86 * is an 8 or 10 digit number, use the obsolete time specification. 87 */ 88 if (!timeset && argc > 1) { 89 (void)strtol(argv[0], &p, 10); 90 len = p - argv[0]; 91 if (*p == '\0' && (len == 8 || len == 10)) { 92 timeset = 1; 93 stime_arg2(*argv++, len == 10, tv); 94 } 95 } 96 97 /* Otherwise use the current time of day. */ 98 if (!timeset) 99 tv[1] = tv[0]; 100 101 if (*argv == NULL) 102 usage(); 103 104 for (rval = 0; *argv; ++argv) { 105 /* See if the file exists. */ 106 if (stat(*argv, &sb)) 107 if (!cflag) { 108 /* Create the file. */ 109 fd = open(*argv, 110 O_WRONLY | O_CREAT, DEFFILEMODE); 111 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 112 rval = 1; 113 warn("%s", *argv); 114 continue; 115 } 116 117 /* If using the current time, we're done. */ 118 if (!timeset) 119 continue; 120 } else 121 continue; 122 123 if (!aflag) 124 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 125 if (!mflag) 126 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 127 128 /* Try utimes(2). */ 129 if (!utimes(*argv, tv)) 130 continue; 131 132 /* If the user specified a time, nothing else we can do. */ 133 if (timeset) { 134 rval = 1; 135 warn("%s", *argv); 136 } 137 138 /* 139 * System V and POSIX 1003.1 require that a NULL argument 140 * set the access/modification times to the current time. 141 * The permission checks are different, too, in that the 142 * ability to write the file is sufficient. Take a shot. 143 */ 144 if (!utimes(*argv, NULL)) 145 continue; 146 147 /* Try reading/writing. */ 148 if (rw(*argv, &sb, fflag)) 149 rval = 1; 150 } 151 exit(rval); 152 } 153 154 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 155 156 void 157 stime_arg1(arg, tvp) 158 char *arg; 159 struct timeval *tvp; 160 { 161 struct tm *t; 162 int yearset; 163 char *p; 164 /* Start with the current time. */ 165 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 166 err(1, "localtime"); 167 /* [[CC]YY]MMDDhhmm[.SS] */ 168 if ((p = strchr(arg, '.')) == NULL) 169 t->tm_sec = 0; /* Seconds defaults to 0. */ 170 else { 171 if (strlen(p + 1) != 2) 172 goto terr; 173 *p++ = '\0'; 174 t->tm_sec = ATOI2(p); 175 } 176 177 yearset = 0; 178 switch(strlen(arg)) { 179 case 12: /* CCYYMMDDhhmm */ 180 t->tm_year = ATOI2(arg); 181 t->tm_year *= 100; 182 yearset = 1; 183 /* FALLTHOUGH */ 184 case 10: /* YYMMDDhhmm */ 185 if (yearset) { 186 yearset = ATOI2(arg); 187 t->tm_year += yearset; 188 } else { 189 yearset = ATOI2(arg); 190 if (yearset < 69) 191 t->tm_year = yearset + 2000; 192 else 193 t->tm_year = yearset + 1900; 194 } 195 t->tm_year -= 1900; /* Convert to UNIX time. */ 196 /* FALLTHROUGH */ 197 case 8: /* MMDDhhmm */ 198 t->tm_mon = ATOI2(arg); 199 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 200 t->tm_mday = ATOI2(arg); 201 t->tm_hour = ATOI2(arg); 202 t->tm_min = ATOI2(arg); 203 break; 204 default: 205 goto terr; 206 } 207 208 t->tm_isdst = -1; /* Figure out DST. */ 209 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 210 if (tvp[0].tv_sec == -1) 211 terr: errx(1, 212 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 213 214 tvp[0].tv_usec = tvp[1].tv_usec = 0; 215 } 216 217 void 218 stime_arg2(arg, year, tvp) 219 char *arg; 220 int year; 221 struct timeval *tvp; 222 { 223 struct tm *t; 224 /* Start with the current time. */ 225 if ((t = localtime(&tvp[0].tv_sec)) == NULL) 226 err(1, "localtime"); 227 228 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 229 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 230 t->tm_mday = ATOI2(arg); 231 t->tm_hour = ATOI2(arg); 232 t->tm_min = ATOI2(arg); 233 if (year) 234 t->tm_year = ATOI2(arg); 235 236 t->tm_isdst = -1; /* Figure out DST. */ 237 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 238 if (tvp[0].tv_sec == -1) 239 errx(1, 240 "out of range or illegal time specification: MMDDhhmm[yy]"); 241 242 tvp[0].tv_usec = tvp[1].tv_usec = 0; 243 } 244 245 void 246 stime_file(fname, tvp) 247 char *fname; 248 struct timeval *tvp; 249 { 250 struct stat sb; 251 252 if (stat(fname, &sb)) 253 err(1, "%s", fname); 254 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 255 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 256 } 257 258 int 259 rw(fname, sbp, force) 260 char *fname; 261 struct stat *sbp; 262 int force; 263 { 264 int fd, needed_chmod, rval; 265 u_char byte; 266 267 /* Try regular files and directories. */ 268 if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) { 269 warnx("%s: %s", fname, strerror(EFTYPE)); 270 return (1); 271 } 272 273 needed_chmod = rval = 0; 274 if ((fd = open(fname, O_RDWR, 0)) == -1) { 275 if (!force || chmod(fname, DEFFILEMODE)) 276 goto err; 277 if ((fd = open(fname, O_RDWR, 0)) == -1) 278 goto err; 279 needed_chmod = 1; 280 } 281 282 if (sbp->st_size != 0) { 283 if (read(fd, &byte, sizeof(byte)) != sizeof(byte)) 284 goto err; 285 if (lseek(fd, (off_t)0, SEEK_SET) == -1) 286 goto err; 287 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) 288 goto err; 289 } else { 290 if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) { 291 err: rval = 1; 292 warn("%s", fname); 293 } else if (ftruncate(fd, (off_t)0)) { 294 rval = 1; 295 warn("%s: file modified", fname); 296 } 297 } 298 299 if (close(fd) && rval != 1) { 300 rval = 1; 301 warn("%s", fname); 302 } 303 if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) { 304 rval = 1; 305 warn("%s: permissions modified", fname); 306 } 307 return (rval); 308 } 309 310 __dead void 311 usage() 312 { 313 (void)fprintf(stderr, 314 "usage: touch [-acfm] [-r file] [-t time] file ...\n"); 315 exit(1); 316 } 317