date.c revision 44598
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 1.26 1998/10/03 16:29:59 alex 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, nflag; 65 66static void setthetime __P((const char *, const char *)); 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 char *format, buf[1024]; 82 char *endptr, *fmt; 83 int set_timezone; 84 struct vary *v; 85 const struct vary *badv; 86 struct tm lt; 87 88 v = NULL; 89 fmt = NULL; 90 (void) setlocale(LC_TIME, ""); 91 tz.tz_dsttime = tz.tz_minuteswest = 0; 92 rflag = 0; 93 set_timezone = 0; 94 while ((ch = getopt(argc, argv, "d:f:nr: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 'n': /* don't set network */ 106 nflag = 1; 107 break; 108 case 'r': /* user specified seconds */ 109 rflag = 1; 110 tval = atol(optarg); 111 break; 112 case 't': /* minutes west of GMT */ 113 /* error check; don't allow "PST" */ 114 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 115 if (endptr == optarg || *endptr != '\0') 116 usage(); 117 set_timezone = 1; 118 break; 119 case 'u': /* do everything in GMT */ 120 (void)setenv("TZ", "GMT0", 1); 121 break; 122 case 'v': 123 v = vary_append(v, optarg); 124 break; 125 default: 126 usage(); 127 } 128 argc -= optind; 129 argv += optind; 130 131 /* 132 * If -d or -t, set the timezone or daylight savings time; this 133 * doesn't belong here; the kernel should not know about either. 134 */ 135 if (set_timezone && settimeofday((struct timeval *)NULL, &tz)) 136 err(1, "settimeofday (timezone)"); 137 138 if (!rflag && time(&tval) == -1) 139 err(1, "time"); 140 141 format = "%+"; 142 143 /* allow the operands in any order */ 144 if (*argv && **argv == '+') { 145 format = *argv + 1; 146 ++argv; 147 } 148 149 if (*argv) { 150 setthetime(fmt, *argv); 151 ++argv; 152 } else if (fmt != NULL) 153 usage(); 154 155 if (*argv && **argv == '+') 156 format = *argv + 1; 157 158 lt = *localtime(&tval); 159 badv = vary_apply(v, <); 160 if (badv) { 161 fprintf(stderr, "%s: Cannot apply date adjustment\n", 162 badv->arg); 163 vary_destroy(v); 164 usage(); 165 } 166 vary_destroy(v); 167 (void)strftime(buf, sizeof(buf), format, <); 168 (void)printf("%s\n", buf); 169 exit(retval); 170} 171 172#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 173void 174setthetime(fmt, p) 175 const char *fmt; 176 register const char *p; 177{ 178 register struct tm *lt; 179 struct timeval tv; 180 const char *dot, *t; 181 182 if (fmt != NULL) { 183 lt = localtime(&tval); 184 t = strptime(p, fmt, lt); 185 if (t == NULL) { 186 fprintf(stderr, "Failed conversion of ``%s''" 187 " using format ``%s''\n", p, fmt); 188 lt = localtime(&tval); 189 return; 190 } else if (*t != '\0') 191 fprintf(stderr, "Warning: Ignoring %ld extraneous" 192 " characters in date string (%s)\n", 193 (long) strlen(t), t); 194 } else { 195 for (t = p, dot = NULL; *t; ++t) { 196 if (isdigit(*t)) 197 continue; 198 if (*t == '.' && dot == NULL) { 199 dot = t; 200 continue; 201 } 202 badformat(); 203 } 204 205 lt = localtime(&tval); 206 207 if (dot != NULL) { /* .ss */ 208 dot++; /* *dot++ = '\0'; */ 209 if (strlen(dot) != 2) 210 badformat(); 211 lt->tm_sec = ATOI2(dot); 212 if (lt->tm_sec > 61) 213 badformat(); 214 } else 215 lt->tm_sec = 0; 216 217 /* if p has a ".ss" field then let's pretend it's not there */ 218 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 219 case 10: /* yy */ 220 lt->tm_year = ATOI2(p); 221 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 222 lt->tm_year += 100; 223 /* FALLTHROUGH */ 224 case 8: /* mm */ 225 lt->tm_mon = ATOI2(p); 226 if (lt->tm_mon > 12) 227 badformat(); 228 --lt->tm_mon; /* time struct is 0 - 11 */ 229 /* FALLTHROUGH */ 230 case 6: /* dd */ 231 lt->tm_mday = ATOI2(p); 232 if (lt->tm_mday > 31) 233 badformat(); 234 /* FALLTHROUGH */ 235 case 4: /* HH */ 236 lt->tm_hour = ATOI2(p); 237 if (lt->tm_hour > 23) 238 badformat(); 239 /* FALLTHROUGH */ 240 case 2: /* MM */ 241 lt->tm_min = ATOI2(p); 242 if (lt->tm_min > 59) 243 badformat(); 244 break; 245 default: 246 badformat(); 247 } 248 } 249 250 /* convert broken-down time to GMT clock time */ 251 if ((tval = mktime(lt)) == -1) 252 errx(1, "nonexistent time"); 253 254 /* set the time */ 255 if (nflag || netsettime(tval)) { 256 logwtmp("|", "date", ""); 257 tv.tv_sec = tval; 258 tv.tv_usec = 0; 259 if (settimeofday(&tv, (struct timezone *)NULL)) 260 err(1, "settimeofday (timeval)"); 261 logwtmp("{", "date", ""); 262 } 263 264 if ((p = getlogin()) == NULL) 265 p = "???"; 266 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 267} 268 269static void 270badformat() 271{ 272 warnx("illegal time format"); 273 usage(); 274} 275 276static void 277usage() 278{ 279 (void)fprintf(stderr, "%s\n%s\n", 280 "usage: date [-nu] [-d dst] [-r seconds] [-t west] " 281 "[-v[+|-]val[ymwdHMS]] ... ", 282 " [-f fmt date | [[[[yy]mm]dd]HH]MM[.ss]] [+format]"); 283 exit(1); 284} 285