date.c revision 47129
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 * 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#ifndef lint 35static char const copyright[] = 36"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 43#endif 44static const char rcsid[] = 45 "$Id: date.c,v 1.27 1999/03/09 09:38:54 brian Exp $"; 46#endif /* not lint */ 47 48#include <sys/param.h> 49#include <sys/time.h> 50 51#include <ctype.h> 52#include <err.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <string.h> 56#include <syslog.h> 57#include <unistd.h> 58#include <locale.h> 59 60#include "extern.h" 61#include "vary.h" 62 63time_t tval; 64int retval; 65 66static void setthetime __P((const char *, const char *, int, int)); 67static void badformat __P((void)); 68static void usage __P((void)); 69 70int logwtmp __P((char *, char *, char *)); 71 72int 73main(argc, argv) 74 int argc; 75 char **argv; 76{ 77 extern int optind; 78 extern char *optarg; 79 struct timezone tz; 80 int ch, rflag; 81 int jflag, nflag; 82 char *format, buf[1024]; 83 char *endptr, *fmt; 84 int set_timezone; 85 struct vary *v; 86 const struct vary *badv; 87 struct tm lt; 88 89 v = NULL; 90 fmt = NULL; 91 (void) setlocale(LC_TIME, ""); 92 tz.tz_dsttime = tz.tz_minuteswest = 0; 93 rflag = 0; 94 jflag = nflag = 0; 95 set_timezone = 0; 96 while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1) 97 switch((char)ch) { 98 case 'd': /* daylight savings time */ 99 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 100 if (endptr == optarg || *endptr != '\0') 101 usage(); 102 set_timezone = 1; 103 break; 104 case 'f': 105 fmt = optarg; 106 break; 107 case 'j': 108 jflag = 1; /* don't set time */ 109 break; 110 case 'n': /* don't set network */ 111 nflag = 1; 112 break; 113 case 'r': /* user specified seconds */ 114 rflag = 1; 115 tval = atol(optarg); 116 break; 117 case 't': /* minutes west of GMT */ 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 GMT */ 125 (void)setenv("TZ", "GMT0", 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 exit(retval); 175} 176 177#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 178void 179setthetime(fmt, p, jflag, nflag) 180 const char *fmt; 181 register const char *p; 182 int jflag, nflag; 183{ 184 register struct tm *lt; 185 struct timeval tv; 186 const char *dot, *t; 187 188 if (fmt != NULL) { 189 lt = localtime(&tval); 190 t = strptime(p, fmt, lt); 191 if (t == NULL) { 192 fprintf(stderr, "Failed conversion of ``%s''" 193 " using format ``%s''\n", p, fmt); 194 lt = localtime(&tval); 195 return; 196 } else if (*t != '\0') 197 fprintf(stderr, "Warning: Ignoring %ld extraneous" 198 " characters in date string (%s)\n", 199 (long) strlen(t), t); 200 } else { 201 for (t = p, dot = NULL; *t; ++t) { 202 if (isdigit(*t)) 203 continue; 204 if (*t == '.' && dot == NULL) { 205 dot = t; 206 continue; 207 } 208 badformat(); 209 } 210 211 lt = localtime(&tval); 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 /* if p has a ".ss" field then let's pretend it's not there */ 224 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 225 case 10: /* yy */ 226 lt->tm_year = ATOI2(p); 227 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 228 lt->tm_year += 100; 229 /* FALLTHROUGH */ 230 case 8: /* mm */ 231 lt->tm_mon = ATOI2(p); 232 if (lt->tm_mon > 12) 233 badformat(); 234 --lt->tm_mon; /* time struct is 0 - 11 */ 235 /* FALLTHROUGH */ 236 case 6: /* dd */ 237 lt->tm_mday = ATOI2(p); 238 if (lt->tm_mday > 31) 239 badformat(); 240 /* FALLTHROUGH */ 241 case 4: /* HH */ 242 lt->tm_hour = ATOI2(p); 243 if (lt->tm_hour > 23) 244 badformat(); 245 /* FALLTHROUGH */ 246 case 2: /* MM */ 247 lt->tm_min = ATOI2(p); 248 if (lt->tm_min > 59) 249 badformat(); 250 break; 251 default: 252 badformat(); 253 } 254 } 255 256 /* convert broken-down time to GMT clock time */ 257 if ((tval = mktime(lt)) == -1) 258 errx(1, "nonexistent time"); 259 260 if (!jflag) { 261 /* set the time */ 262 if (nflag || netsettime(tval)) { 263 logwtmp("|", "date", ""); 264 tv.tv_sec = tval; 265 tv.tv_usec = 0; 266 if (settimeofday(&tv, (struct timezone *)NULL)) 267 err(1, "settimeofday (timeval)"); 268 logwtmp("{", "date", ""); 269 } 270 271 if ((p = getlogin()) == NULL) 272 p = "???"; 273 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 274 } 275} 276 277static void 278badformat() 279{ 280 warnx("illegal time format"); 281 usage(); 282} 283 284static void 285usage() 286{ 287 (void)fprintf(stderr, "%s\n%s\n", 288 "usage: date [-nu] [-d dst] [-r seconds] [-t west] " 289 "[-v[+|-]val[ymwdHMS]] ... ", 290 " [-f fmt date | [[[[yy]mm]dd]HH]MM[.ss]] [+format]"); 291 exit(1); 292} 293