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 35 static char 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 /*static char sccsid[] = "from: @(#)date.c 8.1 (Berkeley) 5/31/93";*/ 42 static char *rcsid = "$Id: date.c,v 1.8 1994/09/22 09:24:49 mycroft Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/time.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <fcntl.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <locale.h> 55 #include <syslog.h> 56 #include <unistd.h> 57 58 #include "extern.h" 59 60 time_t tval; 61 int retval, nflag; 62 63 static void setthetime __P((char *)); 64 static void badformat __P((void)); 65 static void usage __P((void)); 66 67 int logwtmp __P((char *, char *, char *)); 68 69 int 70 main(argc, argv) 71 int argc; 72 char **argv; 73 { 74 extern int optind; 75 extern char *optarg; 76 struct timezone tz; 77 int ch, rflag; 78 char *format, buf[1024]; 79 80 setlocale(LC_ALL, ""); 81 82 tz.tz_dsttime = tz.tz_minuteswest = 0; 83 rflag = 0; 84 while ((ch = getopt(argc, argv, "d:nr:ut:")) != -1) 85 switch((char)ch) { 86 case 'd': /* daylight savings time */ 87 tz.tz_dsttime = atoi(optarg) ? 1 : 0; 88 break; 89 case 'n': /* don't set network */ 90 nflag = 1; 91 break; 92 case 'r': /* user specified seconds */ 93 rflag = 1; 94 tval = atol(optarg); 95 break; 96 case 'u': /* do everything in GMT */ 97 (void)setenv("TZ", "GMT0", 1); 98 break; 99 case 't': /* minutes west of GMT */ 100 /* error check; don't allow "PST" */ 101 if (isdigit(*optarg)) { 102 tz.tz_minuteswest = atoi(optarg); 103 break; 104 } 105 /* FALLTHROUGH */ 106 default: 107 usage(); 108 } 109 argc -= optind; 110 argv += optind; 111 112 /* 113 * If -d or -t, set the timezone or daylight savings time; this 114 * doesn't belong here, there kernel should not know about either. 115 */ 116 if ((tz.tz_minuteswest || tz.tz_dsttime) && 117 settimeofday(NULL, &tz)) 118 err(1, "settimeofday"); 119 120 if (!rflag && time(&tval) == -1) 121 err(1, "time"); 122 123 format = "%a %b %e %H:%M:%S %Z %Y"; 124 125 /* allow the operands in any order */ 126 if (*argv && **argv == '+') { 127 format = *argv + 1; 128 ++argv; 129 } 130 131 if (*argv) { 132 setthetime(*argv); 133 ++argv; 134 } 135 136 if (*argv && **argv == '+') 137 format = *argv + 1; 138 139 (void)strftime(buf, sizeof(buf), format, localtime(&tval)); 140 (void)printf("%s\n", buf); 141 exit(retval); 142 } 143 144 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 145 void 146 setthetime(p) 147 register char *p; 148 { 149 register struct tm *lt; 150 struct timeval tv; 151 char *dot, *t; 152 153 for (t = p, dot = NULL; *t; ++t) { 154 if (isdigit(*t)) 155 continue; 156 if (*t == '.' && dot == NULL) { 157 dot = t; 158 continue; 159 } 160 badformat(); 161 } 162 163 lt = localtime(&tval); 164 165 if (dot != NULL) { /* .ss */ 166 *dot++ = '\0'; 167 if (strlen(dot) != 2) 168 badformat(); 169 lt->tm_sec = ATOI2(dot); 170 if (lt->tm_sec > 61) 171 badformat(); 172 } else 173 lt->tm_sec = 0; 174 175 switch (strlen(p)) { 176 case 10: /* yy */ 177 lt->tm_year = ATOI2(p); 178 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 179 lt->tm_year += 100; 180 /* FALLTHROUGH */ 181 case 8: /* mm */ 182 lt->tm_mon = ATOI2(p); 183 if (lt->tm_mon > 12) 184 badformat(); 185 --lt->tm_mon; /* time struct is 0 - 11 */ 186 /* FALLTHROUGH */ 187 case 6: /* dd */ 188 lt->tm_mday = ATOI2(p); 189 if (lt->tm_mday > 31) 190 badformat(); 191 /* FALLTHROUGH */ 192 case 4: /* hh */ 193 lt->tm_hour = ATOI2(p); 194 if (lt->tm_hour > 23) 195 badformat(); 196 /* FALLTHROUGH */ 197 case 2: /* mm */ 198 lt->tm_min = ATOI2(p); 199 if (lt->tm_min > 59) 200 badformat(); 201 break; 202 default: 203 badformat(); 204 } 205 206 /* convert broken-down time to GMT clock time */ 207 if ((tval = mktime(lt)) == -1) 208 badformat(); 209 210 /* set the time */ 211 if (nflag || netsettime(tval)) { 212 logwtmp("|", "date", ""); 213 tv.tv_sec = tval; 214 tv.tv_usec = 0; 215 if (settimeofday(&tv, NULL)) { 216 perror("date: settimeofday"); 217 exit(1); 218 } 219 logwtmp("{", "date", ""); 220 } 221 222 if ((p = getlogin()) == NULL) 223 p = "???"; 224 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 225 } 226 227 static void 228 badformat() 229 { 230 warnx("illegal time format"); 231 usage(); 232 } 233 234 static void 235 usage() 236 { 237 (void)fprintf(stderr, 238 "usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n"); 239 (void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n"); 240 exit(1); 241 } 242