date.c revision 176094
1/*- 2 * Copyright (c) 1985, 1987, 1988, 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#ifndef lint 31static char const copyright[] = 32"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34#endif /* not lint */ 35 36#if 0 37#ifndef lint 38static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 39#endif /* not lint */ 40#endif 41 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: head/bin/date/date.c 176094 2008-02-07 16:04:24Z ru $"); 44 45#include <sys/param.h> 46#include <sys/time.h> 47 48#include <ctype.h> 49#include <err.h> 50#include <locale.h> 51#include <libutil.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <syslog.h> 56#include <unistd.h> 57 58#include "extern.h" 59#include "vary.h" 60 61#ifndef TM_YEAR_BASE 62#define TM_YEAR_BASE 1900 63#endif 64 65static time_t tval; 66int retval; 67 68static void setthetime(const char *, const char *, int, int); 69static void badformat(void); 70static void usage(void); 71 72int 73main(int argc, char *argv[]) 74{ 75 struct timezone tz; 76 int ch, rflag; 77 int jflag, nflag; 78 const char *format; 79 char buf[1024]; 80 char *endptr, *fmt; 81 char *tmp; 82 int set_timezone; 83 struct vary *v; 84 const struct vary *badv; 85 struct tm lt; 86 87 v = NULL; 88 fmt = NULL; 89 (void) setlocale(LC_TIME, ""); 90 tz.tz_dsttime = tz.tz_minuteswest = 0; 91 rflag = 0; 92 jflag = nflag = 0; 93 set_timezone = 0; 94 while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1) 95 switch((char)ch) { 96 case 'd': /* daylight savings time */ 97 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 98 if (endptr == optarg || *endptr != '\0') 99 usage(); 100 set_timezone = 1; 101 break; 102 case 'f': 103 fmt = optarg; 104 break; 105 case 'j': 106 jflag = 1; /* don't set time */ 107 break; 108 case 'n': /* don't set network */ 109 nflag = 1; 110 break; 111 case 'r': /* user specified seconds */ 112 rflag = 1; 113 tval = strtoq(optarg, &tmp, 0); 114 if (*tmp != 0) 115 usage(); 116 break; 117 case 't': /* minutes west of UTC */ 118 /* error check; don't allow "PST" */ 119 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 120 if (endptr == optarg || *endptr != '\0') 121 usage(); 122 set_timezone = 1; 123 break; 124 case 'u': /* do everything in UTC */ 125 (void)setenv("TZ", "UTC0", 1); 126 break; 127 case 'v': 128 v = vary_append(v, optarg); 129 break; 130 default: 131 usage(); 132 } 133 argc -= optind; 134 argv += optind; 135 136 /* 137 * If -d or -t, set the timezone or daylight savings time; this 138 * doesn't belong here; the kernel should not know about either. 139 */ 140 if (set_timezone && settimeofday((struct timeval *)NULL, &tz)) 141 err(1, "settimeofday (timezone)"); 142 143 if (!rflag && time(&tval) == -1) 144 err(1, "time"); 145 146 format = "%+"; 147 148 /* allow the operands in any order */ 149 if (*argv && **argv == '+') { 150 format = *argv + 1; 151 ++argv; 152 } 153 154 if (*argv) { 155 setthetime(fmt, *argv, jflag, nflag); 156 ++argv; 157 } else if (fmt != NULL) 158 usage(); 159 160 if (*argv && **argv == '+') 161 format = *argv + 1; 162 163 lt = *localtime(&tval); 164 badv = vary_apply(v, <); 165 if (badv) { 166 fprintf(stderr, "%s: Cannot apply date adjustment\n", 167 badv->arg); 168 vary_destroy(v); 169 usage(); 170 } 171 vary_destroy(v); 172 (void)strftime(buf, sizeof(buf), format, <); 173 (void)printf("%s\n", buf); 174 if (fflush(stdout)) 175 err(1, "stdout"); 176 exit(retval); 177} 178 179#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 180 181static void 182setthetime(const char *fmt, const char *p, int jflag, int nflag) 183{ 184 struct tm *lt; 185 struct timeval tv; 186 const char *dot, *t; 187 int century; 188 189 lt = localtime(&tval); 190 lt->tm_isdst = -1; /* divine correct DST */ 191 192 if (fmt != NULL) { 193 t = strptime(p, fmt, lt); 194 if (t == NULL) { 195 fprintf(stderr, "Failed conversion of ``%s''" 196 " using format ``%s''\n", p, fmt); 197 badformat(); 198 } else if (*t != '\0') 199 fprintf(stderr, "Warning: Ignoring %ld extraneous" 200 " characters in date string (%s)\n", 201 (long) strlen(t), t); 202 } else { 203 for (t = p, dot = NULL; *t; ++t) { 204 if (isdigit(*t)) 205 continue; 206 if (*t == '.' && dot == NULL) { 207 dot = t; 208 continue; 209 } 210 badformat(); 211 } 212 213 if (dot != NULL) { /* .ss */ 214 dot++; /* *dot++ = '\0'; */ 215 if (strlen(dot) != 2) 216 badformat(); 217 lt->tm_sec = ATOI2(dot); 218 if (lt->tm_sec > 61) 219 badformat(); 220 } else 221 lt->tm_sec = 0; 222 223 century = 0; 224 /* if p has a ".ss" field then let's pretend it's not there */ 225 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 226 case 12: /* cc */ 227 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 228 century = 1; 229 /* FALLTHROUGH */ 230 case 10: /* yy */ 231 if (century) 232 lt->tm_year += ATOI2(p); 233 else { 234 lt->tm_year = ATOI2(p); 235 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 236 lt->tm_year += 2000 - TM_YEAR_BASE; 237 else 238 lt->tm_year += 1900 - TM_YEAR_BASE; 239 } 240 /* FALLTHROUGH */ 241 case 8: /* mm */ 242 lt->tm_mon = ATOI2(p); 243 if (lt->tm_mon > 12) 244 badformat(); 245 --lt->tm_mon; /* time struct is 0 - 11 */ 246 /* FALLTHROUGH */ 247 case 6: /* dd */ 248 lt->tm_mday = ATOI2(p); 249 if (lt->tm_mday > 31) 250 badformat(); 251 /* FALLTHROUGH */ 252 case 4: /* HH */ 253 lt->tm_hour = ATOI2(p); 254 if (lt->tm_hour > 23) 255 badformat(); 256 /* FALLTHROUGH */ 257 case 2: /* MM */ 258 lt->tm_min = ATOI2(p); 259 if (lt->tm_min > 59) 260 badformat(); 261 break; 262 default: 263 badformat(); 264 } 265 } 266 267 /* convert broken-down time to GMT clock time */ 268 if ((tval = mktime(lt)) == -1) 269 errx(1, "nonexistent time"); 270 271 if (!jflag) { 272 /* set the time */ 273 if (nflag || netsettime(tval)) { 274 logwtmp("|", "date", ""); 275 tv.tv_sec = tval; 276 tv.tv_usec = 0; 277 if (settimeofday(&tv, (struct timezone *)NULL)) 278 err(1, "settimeofday (timeval)"); 279 logwtmp("{", "date", ""); 280 } 281 282 if ((p = getlogin()) == NULL) 283 p = "???"; 284 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 285 } 286} 287 288static void 289badformat(void) 290{ 291 warnx("illegal time format"); 292 usage(); 293} 294 295static void 296usage(void) 297{ 298 (void)fprintf(stderr, "%s\n%s\n", 299 "usage: date [-jnu] [-d dst] [-r seconds] [-t west] " 300 "[-v[+|-]val[ymwdHMS]] ... ", 301 " " 302 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 303 exit(1); 304} 305