touch.c revision 1.29
1 /* $NetBSD: touch.c,v 1.29 2011/02/22 15:03:30 pooka 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95"; 41 #endif 42 __RCSID("$NetBSD: touch.c,v 1.29 2011/02/22 15:03:30 pooka Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <locale.h> 56 #include <time.h> 57 #include <tzfile.h> 58 #include <unistd.h> 59 60 int main __P((int, char **)); 61 int rw __P((char *, struct stat *, int)); 62 void stime_arg1 __P((char *, struct timeval *)); 63 void stime_arg2 __P((char *, int, struct timeval *)); 64 void stime_file __P((char *, struct timeval *)); 65 void usage __P((void)); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 struct stat sb; 73 struct timeval tv[2]; 74 int aflag, cflag, hflag, mflag, ch, fd, len, rval, timeset; 75 char *p; 76 int (*change_file_times) __P((const char *, const struct timeval *)); 77 int (*get_file_status) __P((const char *, struct stat *)); 78 79 setlocale(LC_ALL, ""); 80 81 aflag = cflag = hflag = mflag = timeset = 0; 82 if (gettimeofday(&tv[0], NULL)) 83 err(1, "gettimeofday"); 84 85 while ((ch = getopt(argc, argv, "acfhmr:t:")) != -1) 86 switch(ch) { 87 case 'a': 88 aflag = 1; 89 break; 90 case 'c': 91 cflag = 1; 92 break; 93 case 'f': 94 break; 95 case 'h': 96 hflag = 1; 97 break; 98 case 'm': 99 mflag = 1; 100 break; 101 case 'r': 102 timeset = 1; 103 stime_file(optarg, tv); 104 break; 105 case 't': 106 timeset = 1; 107 stime_arg1(optarg, tv); 108 break; 109 case '?': 110 default: 111 usage(); 112 } 113 argc -= optind; 114 argv += optind; 115 116 /* Default is both -a and -m. */ 117 if (aflag == 0 && mflag == 0) 118 aflag = mflag = 1; 119 120 if (hflag) { 121 cflag = 1; /* Don't create new file */ 122 change_file_times = lutimes; 123 get_file_status = lstat; 124 } else { 125 change_file_times = utimes; 126 get_file_status = stat; 127 } 128 129 /* 130 * If no -r or -t flag, at least two operands, the first of which 131 * is an 8 or 10 digit number, use the obsolete time specification. 132 */ 133 if (!timeset && argc > 1) { 134 (void)strtol(argv[0], &p, 10); 135 len = p - argv[0]; 136 if (*p == '\0' && (len == 8 || len == 10)) { 137 timeset = 1; 138 stime_arg2(*argv++, len == 10, tv); 139 } 140 } 141 142 /* Otherwise use the current time of day. */ 143 if (!timeset) 144 tv[1] = tv[0]; 145 146 if (*argv == NULL) 147 usage(); 148 149 for (rval = 0; *argv; ++argv) { 150 /* See if the file exists. */ 151 if ((*get_file_status)(*argv, &sb)) { 152 if (!cflag) { 153 /* Create the file. */ 154 fd = open(*argv, 155 O_WRONLY | O_CREAT, DEFFILEMODE); 156 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 157 rval = 1; 158 warn("%s", *argv); 159 continue; 160 } 161 162 /* If using the current time, we're done. */ 163 if (!timeset) 164 continue; 165 } else 166 continue; 167 } 168 if (!aflag) 169 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 170 if (!mflag) 171 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 172 173 /* Try utimes(2). */ 174 if (!(*change_file_times)(*argv, tv)) 175 continue; 176 177 /* If the user specified a time, nothing else we can do. */ 178 if (timeset) { 179 rval = 1; 180 warn("%s", *argv); 181 } 182 183 /* 184 * System V and POSIX 1003.1 require that a NULL argument 185 * set the access/modification times to the current time. 186 * The permission checks are different, too, in that the 187 * ability to write the file is sufficient. Take a shot. 188 */ 189 if (!(*change_file_times)(*argv, NULL)) 190 continue; 191 192 rval = 1; 193 warn("%s", *argv); 194 } 195 exit(rval); 196 } 197 198 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 199 200 void 201 stime_arg1(arg, tvp) 202 char *arg; 203 struct timeval *tvp; 204 { 205 struct tm *t; 206 time_t tmptime; 207 int yearset; 208 char *p; 209 /* Start with the current time. */ 210 tmptime = tvp[0].tv_sec; 211 if ((t = localtime(&tmptime)) == NULL) 212 err(1, "localtime"); 213 /* [[CC]YY]MMDDhhmm[.SS] */ 214 if ((p = strchr(arg, '.')) == NULL) 215 t->tm_sec = 0; /* Seconds defaults to 0. */ 216 else { 217 if (strlen(p + 1) != 2) 218 goto terr; 219 *p++ = '\0'; 220 t->tm_sec = ATOI2(p); 221 } 222 223 yearset = 0; 224 switch (strlen(arg)) { 225 case 12: /* CCYYMMDDhhmm */ 226 t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE; 227 yearset = 1; 228 /* FALLTHROUGH */ 229 case 10: /* YYMMDDhhmm */ 230 if (yearset) { 231 t->tm_year += ATOI2(arg); 232 } else { 233 yearset = ATOI2(arg); 234 if (yearset < 69) 235 t->tm_year = yearset + 2000 - TM_YEAR_BASE; 236 else 237 t->tm_year = yearset + 1900 - TM_YEAR_BASE; 238 } 239 /* FALLTHROUGH */ 240 case 8: /* MMDDhhmm */ 241 t->tm_mon = ATOI2(arg); 242 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 243 /* FALLTHROUGH */ 244 case 6: 245 t->tm_mday = ATOI2(arg); 246 /* FALLTHROUGH */ 247 case 4: 248 t->tm_hour = ATOI2(arg); 249 /* FALLTHROUGH */ 250 case 2: 251 t->tm_min = ATOI2(arg); 252 break; 253 default: 254 goto terr; 255 } 256 257 t->tm_isdst = -1; /* Figure out DST. */ 258 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 259 if (tvp[0].tv_sec == -1) 260 terr: errx(1, 261 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 262 263 tvp[0].tv_usec = tvp[1].tv_usec = 0; 264 } 265 266 void 267 stime_arg2(arg, year, tvp) 268 char *arg; 269 int year; 270 struct timeval *tvp; 271 { 272 struct tm *t; 273 time_t tmptime; 274 /* Start with the current time. */ 275 tmptime = tvp[0].tv_sec; 276 if ((t = localtime(&tmptime)) == NULL) 277 err(1, "localtime"); 278 279 t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */ 280 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 281 t->tm_mday = ATOI2(arg); 282 t->tm_hour = ATOI2(arg); 283 t->tm_min = ATOI2(arg); 284 if (year) { 285 year = ATOI2(arg); 286 if (year < 69) 287 t->tm_year = year + 2000 - TM_YEAR_BASE; 288 else 289 t->tm_year = year + 1900 - TM_YEAR_BASE; 290 } 291 t->tm_sec = 0; 292 293 t->tm_isdst = -1; /* Figure out DST. */ 294 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 295 if (tvp[0].tv_sec == -1) 296 errx(1, 297 "out of range or illegal time specification: MMDDhhmm[yy]"); 298 299 tvp[0].tv_usec = tvp[1].tv_usec = 0; 300 } 301 302 void 303 stime_file(fname, tvp) 304 char *fname; 305 struct timeval *tvp; 306 { 307 struct stat sb; 308 309 if (stat(fname, &sb)) 310 err(1, "%s", fname); 311 TIMESPEC_TO_TIMEVAL(&tvp[0], &sb.st_atimespec); 312 TIMESPEC_TO_TIMEVAL(&tvp[1], &sb.st_mtimespec); 313 } 314 315 __dead void 316 usage() 317 { 318 (void)fprintf(stderr, 319 "usage: touch [-acfhm] [-r file] [-t time] file ...\n"); 320 exit(1); 321 } 322
Indexes created Tue Sep 30 17:09:57 GMT 2025