date.c revision 35773
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 const sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 43#endif 44static const char rcsid[] = 45 "$Id$"; 46#endif /* not lint */ 47 48#include <sys/time.h> 49 50#include <ctype.h> 51#include <err.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <syslog.h> 55#include <unistd.h> 56#include <locale.h> 57 58#include "extern.h" 59#include "vary.h" 60 61time_t tval; 62int retval, nflag; 63 64static void setthetime __P((const char *, const char *)); 65static void badformat __P((void)); 66static void usage __P((void)); 67 68int logwtmp __P((char *, char *, char *)); 69 70int 71main(argc, argv) 72 int argc; 73 char **argv; 74{ 75 extern int optind; 76 extern char *optarg; 77 struct timezone tz; 78 int ch, rflag; 79 char *format, buf[1024]; 80 char *endptr, *fmt; 81 int set_timezone; 82 struct vary *v; 83 const struct vary *badv; 84 struct tm lt; 85 86 v = NULL; 87 fmt = NULL; 88 (void) setlocale(LC_TIME, ""); 89 tz.tz_dsttime = tz.tz_minuteswest = 0; 90 rflag = 0; 91 set_timezone = 0; 92 while ((ch = getopt(argc, argv, "d:f:nr:t:uv:")) != -1) 93 switch((char)ch) { 94 case 'd': /* daylight savings time */ 95 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 96 if (endptr == optarg || *endptr != '\0') 97 usage(); 98 set_timezone = 1; 99 break; 100 case 'f': 101 fmt = optarg; 102 break; 103 case 'n': /* don't set network */ 104 nflag = 1; 105 break; 106 case 'r': /* user specified seconds */ 107 rflag = 1; 108 tval = atol(optarg); 109 break; 110 case 't': /* minutes west of GMT */ 111 /* error check; don't allow "PST" */ 112 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 113 if (endptr == optarg || *endptr != '\0') 114 usage(); 115 set_timezone = 1; 116 break; 117 case 'u': /* do everything in GMT */ 118 (void)setenv("TZ", "GMT0", 1); 119 break; 120 case 'v': 121 v = vary_append(v, optarg); 122 break; 123 default: 124 usage(); 125 } 126 argc -= optind; 127 argv += optind; 128 129 /* 130 * If -d or -t, set the timezone or daylight savings time; this 131 * doesn't belong here; the kernel should not know about either. 132 */ 133 if (set_timezone && settimeofday((struct timeval *)NULL, &tz)) 134 err(1, "settimeofday (timezone)"); 135 136 if (!rflag && time(&tval) == -1) 137 err(1, "time"); 138 139 format = "%+"; 140 141 /* allow the operands in any order */ 142 if (*argv && **argv == '+') { 143 format = *argv + 1; 144 ++argv; 145 } 146 147 if (*argv) { 148 setthetime(fmt, *argv); 149 ++argv; 150 } else if (fmt != NULL) 151 usage(); 152 153 if (*argv && **argv == '+') 154 format = *argv + 1; 155 156 lt = *localtime(&tval); 157 badv = vary_apply(v, <); 158 if (badv) { 159 fprintf(stderr, "%s: Cannot apply date adjustment\n", 160 badv->arg); 161 vary_destroy(v); 162 usage(); 163 } 164 vary_destroy(v); 165 (void)strftime(buf, sizeof(buf), format, <); 166 (void)printf("%s\n", buf); 167 exit(retval); 168} 169 170#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 171void 172setthetime(fmt, p) 173 const char *fmt; 174 register const char *p; 175{ 176 register struct tm *lt; 177 struct timeval tv; 178 const char *dot, *t; 179 180 if (fmt != NULL) { 181 lt = localtime(&tval); 182 t = strptime(p, fmt, lt); 183 if (t == NULL) { 184 fprintf(stderr, "Failed conversion of ``%s''" 185 " using format ``%s''\n", p, fmt); 186 lt = localtime(&tval); 187 return; 188 } else if (*t != '\0') 189 fprintf(stderr, "Warning: Ignoring %ld extraneous" 190 " characters in date string (%s)\n", 191 (long) strlen(t), t); 192 } else { 193 for (t = p, dot = NULL; *t; ++t) { 194 if (isdigit(*t)) 195 continue; 196 if (*t == '.' && dot == NULL) { 197 dot = t; 198 continue; 199 } 200 badformat(); 201 } 202 203 lt = localtime(&tval); 204 205 if (dot != NULL) { /* .ss */ 206 dot++; /* *dot++ = '\0'; */ 207 if (strlen(dot) != 2) 208 badformat(); 209 lt->tm_sec = ATOI2(dot); 210 if (lt->tm_sec > 61) 211 badformat(); 212 } else 213 lt->tm_sec = 0; 214 215 /* if p has a ".ss" field then let's pretend it's not there */ 216 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 217 case 10: /* yy */ 218 lt->tm_year = ATOI2(p); 219 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 220 lt->tm_year += 100; 221 /* FALLTHROUGH */ 222 case 8: /* mm */ 223 lt->tm_mon = ATOI2(p); 224 if (lt->tm_mon > 12) 225 badformat(); 226 --lt->tm_mon; /* time struct is 0 - 11 */ 227 /* FALLTHROUGH */ 228 case 6: /* dd */ 229 lt->tm_mday = ATOI2(p); 230 if (lt->tm_mday > 31) 231 badformat(); 232 /* FALLTHROUGH */ 233 case 4: /* HH */ 234 lt->tm_hour = ATOI2(p); 235 if (lt->tm_hour > 23) 236 badformat(); 237 /* FALLTHROUGH */ 238 case 2: /* MM */ 239 lt->tm_min = ATOI2(p); 240 if (lt->tm_min > 59) 241 badformat(); 242 break; 243 default: 244 badformat(); 245 } 246 } 247 248 /* convert broken-down time to GMT clock time */ 249 if ((tval = mktime(lt)) == -1) 250 errx(1, "nonexistent time"); 251 252 /* set the time */ 253 if (nflag || netsettime(tval)) { 254 logwtmp("|", "date", ""); 255 tv.tv_sec = tval; 256 tv.tv_usec = 0; 257 if (settimeofday(&tv, (struct timezone *)NULL)) 258 err(1, "settimeofday (timeval)"); 259 logwtmp("{", "date", ""); 260 } 261 262 if ((p = getlogin()) == NULL) 263 p = "???"; 264 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 265} 266 267static void 268badformat() 269{ 270 warnx("illegal time format"); 271 usage(); 272} 273 274static void 275usage() 276{ 277 (void)fprintf(stderr, "%s\n%s\n", 278 "usage: date [-nu] [-d dst] [-r seconds] [-t west] " 279 "[-v[+|-]val[ymwdHM]] ... ", 280 " [-f fmt date | [[[[yy]mm]dd]HH]MM[.ss]] [+format]"); 281 exit(1); 282} 283