date.c revision 48214
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 1.28 1999/05/14 00:28:41 jmg 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 badformat(); 195 } else if (*t != '\0') 196 fprintf(stderr, "Warning: Ignoring %ld extraneous" 197 " characters in date string (%s)\n", 198 (long) strlen(t), t); 199 } else { 200 for (t = p, dot = NULL; *t; ++t) { 201 if (isdigit(*t)) 202 continue; 203 if (*t == '.' && dot == NULL) { 204 dot = t; 205 continue; 206 } 207 badformat(); 208 } 209 210 lt = localtime(&tval); 211 212 if (dot != NULL) { /* .ss */ 213 dot++; /* *dot++ = '\0'; */ 214 if (strlen(dot) != 2) 215 badformat(); 216 lt->tm_sec = ATOI2(dot); 217 if (lt->tm_sec > 61) 218 badformat(); 219 } else 220 lt->tm_sec = 0; 221 222 /* if p has a ".ss" field then let's pretend it's not there */ 223 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 224 case 10: /* yy */ 225 lt->tm_year = ATOI2(p); 226 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 227 lt->tm_year += 100; 228 /* FALLTHROUGH */ 229 case 8: /* mm */ 230 lt->tm_mon = ATOI2(p); 231 if (lt->tm_mon > 12) 232 badformat(); 233 --lt->tm_mon; /* time struct is 0 - 11 */ 234 /* FALLTHROUGH */ 235 case 6: /* dd */ 236 lt->tm_mday = ATOI2(p); 237 if (lt->tm_mday > 31) 238 badformat(); 239 /* FALLTHROUGH */ 240 case 4: /* HH */ 241 lt->tm_hour = ATOI2(p); 242 if (lt->tm_hour > 23) 243 badformat(); 244 /* FALLTHROUGH */ 245 case 2: /* MM */ 246 lt->tm_min = ATOI2(p); 247 if (lt->tm_min > 59) 248 badformat(); 249 break; 250 default: 251 badformat(); 252 } 253 } 254 255 /* convert broken-down time to GMT clock time */ 256 if ((tval = mktime(lt)) == -1) 257 errx(1, "nonexistent time"); 258 259 if (!jflag) { 260 /* set the time */ 261 if (nflag || netsettime(tval)) { 262 logwtmp("|", "date", ""); 263 tv.tv_sec = tval; 264 tv.tv_usec = 0; 265 if (settimeofday(&tv, (struct timezone *)NULL)) 266 err(1, "settimeofday (timeval)"); 267 logwtmp("{", "date", ""); 268 } 269 270 if ((p = getlogin()) == NULL) 271 p = "???"; 272 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 273 } 274} 275 276static void 277badformat() 278{ 279 warnx("illegal time format"); 280 usage(); 281} 282 283static void 284usage() 285{ 286 (void)fprintf(stderr, "%s\n%s\n", 287 "usage: date [-nu] [-d dst] [-r seconds] [-t west] " 288 "[-v[+|-]val[ymwdHMS]] ... ", 289 " [-f fmt date | [[[[yy]mm]dd]HH]MM[.ss]] [+format]"); 290 exit(1); 291} 292