touch.c revision 1.14
1/* $OpenBSD: touch.c,v 1.14 2006/03/08 12:20:05 henning Exp $ */ 2/* $NetBSD: touch.c,v 1.11 1995/08/31 22:10:06 jtc Exp $ */ 3 4/* 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include <sys/types.h> 34#include <sys/stat.h> 35#include <sys/time.h> 36 37#include <err.h> 38#include <errno.h> 39#include <fcntl.h> 40#include <stdio.h> 41#include <stdlib.h> 42#include <string.h> 43#include <locale.h> 44#include <time.h> 45#include <tzfile.h> 46#include <unistd.h> 47 48void stime_arg1(char *, struct timeval *); 49void stime_arg2(char *, int, struct timeval *); 50void stime_file(char *, struct timeval *); 51__dead void usage(void); 52 53int 54main(int argc, char *argv[]) 55{ 56 struct stat sb; 57 struct timeval tv[2]; 58 int aflag, cflag, mflag, ch, fd, len, rval, timeset; 59 char *p; 60 61 (void)setlocale(LC_ALL, ""); 62 63 aflag = cflag = mflag = timeset = 0; 64 if (gettimeofday(&tv[0], NULL)) 65 err(1, "gettimeofday"); 66 67 while ((ch = getopt(argc, argv, "acfmr:t:")) != -1) 68 switch (ch) { 69 case 'a': 70 aflag = 1; 71 break; 72 case 'c': 73 cflag = 1; 74 break; 75 case 'f': 76 break; 77 case 'm': 78 mflag = 1; 79 break; 80 case 'r': 81 timeset = 1; 82 stime_file(optarg, tv); 83 break; 84 case 't': 85 timeset = 1; 86 stime_arg1(optarg, tv); 87 break; 88 default: 89 usage(); 90 } 91 argc -= optind; 92 argv += optind; 93 94 /* Default is both -a and -m. */ 95 if (aflag == 0 && mflag == 0) 96 aflag = mflag = 1; 97 98 /* 99 * If no -r or -t flag, at least two operands, the first of which 100 * is an 8 or 10 digit number, use the obsolete time specification. 101 */ 102 if (!timeset && argc > 1) { 103 (void)strtol(argv[0], &p, 10); 104 len = p - argv[0]; 105 if (*p == '\0' && (len == 8 || len == 10)) { 106 timeset = 1; 107 stime_arg2(*argv++, len == 10, tv); 108 } 109 } 110 111 /* Otherwise use the current time of day. */ 112 if (!timeset) 113 tv[1] = tv[0]; 114 115 if (*argv == NULL) 116 usage(); 117 118 for (rval = 0; *argv; ++argv) { 119 /* See if the file exists. */ 120 if (stat(*argv, &sb)) { 121 if (!cflag) { 122 /* Create the file. */ 123 fd = open(*argv, 124 O_WRONLY | O_CREAT, DEFFILEMODE); 125 if (fd == -1 || fstat(fd, &sb) || close(fd)) { 126 rval = 1; 127 warn("%s", *argv); 128 continue; 129 } 130 131 /* If using the current time, we're done. */ 132 if (!timeset) 133 continue; 134 } else 135 continue; 136 } 137 138 if (!aflag) 139 TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec); 140 if (!mflag) 141 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 142 143 /* Try utimes(2). */ 144 if (!utimes(*argv, tv)) 145 continue; 146 147 /* If the user specified a time, nothing else we can do. */ 148 if (timeset) { 149 rval = 1; 150 warn("%s", *argv); 151 } 152 153 /* 154 * System V and POSIX 1003.1 require that a NULL argument 155 * set the access/modification times to the current time. 156 * The permission checks are different, too, in that the 157 * ability to write the file is sufficient. Take a shot. 158 */ 159 if (!utimes(*argv, NULL)) 160 continue; 161 162 rval = 1; 163 warn("%s", *argv); 164 } 165 exit(rval); 166} 167 168#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 169 170void 171stime_arg1(char *arg, struct timeval *tvp) 172{ 173 struct tm *t; 174 time_t tmptime; 175 int yearset; 176 char *p; 177 /* Start with the current time. */ 178 tmptime = tvp[0].tv_sec; 179 if ((t = localtime(&tmptime)) == NULL) 180 err(1, "localtime"); 181 /* [[CC]YY]MMDDhhmm[.SS] */ 182 if ((p = strchr(arg, '.')) == NULL) 183 t->tm_sec = 0; /* Seconds defaults to 0. */ 184 else { 185 if (strlen(p + 1) != 2) 186 goto terr; 187 *p++ = '\0'; 188 t->tm_sec = ATOI2(p); 189 } 190 191 yearset = 0; 192 switch (strlen(arg)) { 193 case 12: /* CCYYMMDDhhmm */ 194 t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE; 195 yearset = 1; 196 /* FALLTHROUGH */ 197 case 10: /* YYMMDDhhmm */ 198 if (yearset) { 199 yearset = ATOI2(arg); 200 t->tm_year += yearset; 201 } else { 202 yearset = ATOI2(arg); 203 if (yearset < 69) 204 t->tm_year = yearset + 2000 - TM_YEAR_BASE; 205 else 206 t->tm_year = yearset + 1900 - TM_YEAR_BASE; 207 } 208 /* FALLTHROUGH */ 209 case 8: /* MMDDhhmm */ 210 t->tm_mon = ATOI2(arg); 211 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 212 t->tm_mday = ATOI2(arg); 213 t->tm_hour = ATOI2(arg); 214 t->tm_min = ATOI2(arg); 215 break; 216 default: 217 goto terr; 218 } 219 220 t->tm_isdst = -1; /* Figure out DST. */ 221 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 222 if (tvp[0].tv_sec == -1) 223terr: errx(1, 224 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 225 226 tvp[0].tv_usec = tvp[1].tv_usec = 0; 227} 228 229void 230stime_arg2(char *arg, int year, struct timeval *tvp) 231{ 232 struct tm *t; 233 time_t tmptime; 234 /* Start with the current time. */ 235 tmptime = tvp[0].tv_sec; 236 if ((t = localtime(&tmptime)) == NULL) 237 err(1, "localtime"); 238 239 t->tm_mon = ATOI2(arg); /* MMDDhhmm[YY] */ 240 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 241 t->tm_mday = ATOI2(arg); 242 t->tm_hour = ATOI2(arg); 243 t->tm_min = ATOI2(arg); 244 if (year) { 245 year = ATOI2(arg); 246 if (year < 69) 247 t->tm_year = year + 2000 - TM_YEAR_BASE; 248 else 249 t->tm_year = year + 1900 - TM_YEAR_BASE; 250 } 251 t->tm_sec = 0; 252 253 t->tm_isdst = -1; /* Figure out DST. */ 254 tvp[0].tv_sec = tvp[1].tv_sec = mktime(t); 255 if (tvp[0].tv_sec == -1) 256 errx(1, 257 "out of range or illegal time specification: MMDDhhmm[YY]"); 258 259 tvp[0].tv_usec = tvp[1].tv_usec = 0; 260} 261 262void 263stime_file(char *fname, struct timeval *tvp) 264{ 265 struct stat sb; 266 267 if (stat(fname, &sb)) 268 err(1, "%s", fname); 269 TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec); 270 TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec); 271} 272 273__dead void 274usage(void) 275{ 276 extern char *__progname; 277 278 (void)fprintf(stderr, 279 "usage: %s [-acm] [-r file] [-t time] file ...\n", __progname); 280 exit(1); 281} 282