date.c revision 1.12
1/* $NetBSD: date.c,v 1.12 1997/01/09 16:31:05 tls Exp $ */ 2 3/* 4 * Copyright (c) 1985, 1987, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#ifndef lint 37static char copyright[] = 38"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40#endif /* not lint */ 41 42#ifndef lint 43#if 0 44static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 45#else 46static char rcsid[] = "$NetBSD: date.c,v 1.12 1997/01/09 16:31:05 tls Exp $"; 47#endif 48#endif /* not lint */ 49 50#include <sys/param.h> 51#include <sys/time.h> 52 53#include <ctype.h> 54#include <err.h> 55#include <fcntl.h> 56#include <stdio.h> 57#include <stdlib.h> 58#include <string.h> 59#include <locale.h> 60#include <syslog.h> 61#include <unistd.h> 62 63#include "extern.h" 64 65time_t tval; 66int retval, nflag; 67 68static void setthetime __P((char *)); 69static void badformat __P((void)); 70static void usage __P((void)); 71 72int logwtmp __P((char *, char *, char *)); 73 74int 75main(argc, argv) 76 int argc; 77 char **argv; 78{ 79 extern int optind; 80 extern char *optarg; 81 struct timezone tz; 82 int ch, rflag; 83 char *format, buf[1024]; 84 85 setlocale(LC_ALL, ""); 86 87 tz.tz_dsttime = tz.tz_minuteswest = 0; 88 rflag = 0; 89 while ((ch = getopt(argc, argv, "d:nr:ut:")) != -1) 90 switch((char)ch) { 91 case 'd': /* daylight savings time */ 92 tz.tz_dsttime = atoi(optarg) ? 1 : 0; 93 break; 94 case 'n': /* don't set network */ 95 nflag = 1; 96 break; 97 case 'r': /* user specified seconds */ 98 rflag = 1; 99 tval = atol(optarg); 100 break; 101 case 'u': /* do everything in GMT */ 102 (void)setenv("TZ", "GMT0", 1); 103 break; 104 case 't': /* minutes west of GMT */ 105 /* error check; don't allow "PST" */ 106 if (isdigit(*optarg)) { 107 tz.tz_minuteswest = atoi(optarg); 108 break; 109 } 110 /* FALLTHROUGH */ 111 default: 112 usage(); 113 } 114 argc -= optind; 115 argv += optind; 116 117 /* 118 * If -d or -t, set the timezone or daylight savings time; this 119 * doesn't belong here, there kernel should not know about either. 120 */ 121 if ((tz.tz_minuteswest || tz.tz_dsttime) && 122 settimeofday(NULL, &tz)) 123 err(1, "settimeofday"); 124 125 if (!rflag && time(&tval) == -1) 126 err(1, "time"); 127 128 format = "%a %b %e %H:%M:%S %Z %Y"; 129 130 /* allow the operands in any order */ 131 if (*argv && **argv == '+') { 132 format = *argv + 1; 133 ++argv; 134 } 135 136 if (*argv) { 137 setthetime(*argv); 138 ++argv; 139 } 140 141 if (*argv && **argv == '+') 142 format = *argv + 1; 143 144 (void)strftime(buf, sizeof(buf), format, localtime(&tval)); 145 (void)printf("%s\n", buf); 146 exit(retval); 147} 148 149#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 150void 151setthetime(p) 152 char *p; 153{ 154 struct tm *lt; 155 struct timeval tv; 156 char *dot, *t; 157 158 for (t = p, dot = NULL; *t; ++t) { 159 if (isdigit(*t)) 160 continue; 161 if (*t == '.' && dot == NULL) { 162 dot = t; 163 continue; 164 } 165 badformat(); 166 } 167 168 lt = localtime(&tval); 169 170 if (dot != NULL) { /* .ss */ 171 *dot++ = '\0'; 172 if (strlen(dot) != 2) 173 badformat(); 174 lt->tm_sec = ATOI2(dot); 175 if (lt->tm_sec > 61) 176 badformat(); 177 } else 178 lt->tm_sec = 0; 179 180 switch (strlen(p)) { 181 case 10: /* yy */ 182 lt->tm_year = ATOI2(p); 183 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 184 lt->tm_year += 100; 185 /* FALLTHROUGH */ 186 case 8: /* mm */ 187 lt->tm_mon = ATOI2(p); 188 if (lt->tm_mon > 12) 189 badformat(); 190 --lt->tm_mon; /* time struct is 0 - 11 */ 191 /* FALLTHROUGH */ 192 case 6: /* dd */ 193 lt->tm_mday = ATOI2(p); 194 if (lt->tm_mday > 31) 195 badformat(); 196 /* FALLTHROUGH */ 197 case 4: /* hh */ 198 lt->tm_hour = ATOI2(p); 199 if (lt->tm_hour > 23) 200 badformat(); 201 /* FALLTHROUGH */ 202 case 2: /* mm */ 203 lt->tm_min = ATOI2(p); 204 if (lt->tm_min > 59) 205 badformat(); 206 break; 207 default: 208 badformat(); 209 } 210 211 /* convert broken-down time to GMT clock time */ 212 if ((tval = mktime(lt)) == -1) 213 badformat(); 214 215 /* set the time */ 216 if (nflag || netsettime(tval)) { 217 logwtmp("|", "date", ""); 218 tv.tv_sec = tval; 219 tv.tv_usec = 0; 220 if (settimeofday(&tv, NULL)) { 221 perror("date: settimeofday"); 222 exit(1); 223 } 224 logwtmp("{", "date", ""); 225 } 226 227 if ((p = getlogin()) == NULL) 228 p = "???"; 229 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 230} 231 232static void 233badformat() 234{ 235 warnx("illegal time format"); 236 usage(); 237} 238 239static void 240usage() 241{ 242 (void)fprintf(stderr, 243 "usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n"); 244 (void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n"); 245 exit(1); 246} 247