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 * @(#) Copyright (c) 1985, 1987, 1988, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)date.c 8.2 (Berkeley) 4/28/95 35 * $FreeBSD: src/bin/date/date.c,v 1.32.2.6 2001/10/31 17:31:51 dillon Exp $ 36 * $DragonFly: src/bin/date/date.c,v 1.5 2004/03/19 17:30:59 cpressey Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/time.h> 41 42 #include <ctype.h> 43 #include <err.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <syslog.h> 48 #include <unistd.h> 49 #include <locale.h> 50 #include <libutil.h> 51 52 #include "extern.h" 53 #include "vary.h" 54 55 #ifndef TM_YEAR_BASE 56 #define TM_YEAR_BASE 1900 57 #endif 58 59 time_t tval; 60 int retval; 61 62 static void setthetime (const char *, const char *, int, int); 63 static void badformat (void); 64 static void usage (void); 65 66 int 67 main(int argc, char **argv) 68 { 69 struct timezone tz; 70 int ch, rflag; 71 int jflag, nflag; 72 const char *format; 73 char buf[1024]; 74 char *endptr, *fmt; 75 char *tmp; 76 int set_timezone; 77 struct vary *v; 78 const struct vary *badv; 79 struct tm lt; 80 81 v = NULL; 82 fmt = NULL; 83 (void) setlocale(LC_TIME, ""); 84 tz.tz_dsttime = tz.tz_minuteswest = 0; 85 rflag = 0; 86 jflag = nflag = 0; 87 set_timezone = 0; 88 while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1) 89 switch((char)ch) { 90 case 'd': /* daylight savings time */ 91 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 92 if (endptr == optarg || *endptr != '\0') 93 usage(); 94 set_timezone = 1; 95 break; 96 case 'f': 97 fmt = optarg; 98 break; 99 case 'j': 100 jflag = 1; /* don't set time */ 101 break; 102 case 'n': /* don't set network */ 103 nflag = 1; 104 break; 105 case 'r': /* user specified seconds */ 106 rflag = 1; 107 tval = strtoll(optarg, &tmp, 0); 108 if (*tmp != 0) 109 usage(); 110 break; 111 case 't': /* minutes west of UTC */ 112 /* error check; don't allow "PST" */ 113 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 114 if (endptr == optarg || *endptr != '\0') 115 usage(); 116 set_timezone = 1; 117 break; 118 case 'u': /* do everything in UTC */ 119 (void)setenv("TZ", "UTC0", 1); 120 break; 121 case 'v': 122 v = vary_append(v, optarg); 123 break; 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 130 /* 131 * If -d or -t, set the timezone or daylight savings time; this 132 * doesn't belong here; the kernel should not know about either. 133 */ 134 if (set_timezone && settimeofday((struct timeval *)NULL, &tz)) 135 err(1, "settimeofday (timezone)"); 136 137 if (!rflag && time(&tval) == -1) 138 err(1, "time"); 139 140 format = "%+"; 141 142 /* allow the operands in any order */ 143 if (*argv && **argv == '+') { 144 format = *argv + 1; 145 ++argv; 146 } 147 148 if (*argv) { 149 setthetime(fmt, *argv, jflag, nflag); 150 ++argv; 151 } else if (fmt != NULL) 152 usage(); 153 154 if (*argv && **argv == '+') 155 format = *argv + 1; 156 157 lt = *localtime(&tval); 158 badv = vary_apply(v, <); 159 if (badv) { 160 fprintf(stderr, "%s: Cannot apply date adjustment\n", 161 badv->arg); 162 vary_destroy(v); 163 usage(); 164 } 165 vary_destroy(v); 166 (void)strftime(buf, sizeof(buf), format, <); 167 (void)printf("%s\n", buf); 168 exit(retval); 169 } 170 171 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 172 173 void 174 setthetime(const char *fmt, register const char *p, int jflag, int nflag) 175 { 176 register struct tm *lt; 177 struct timeval tv; 178 const char *dot, *t; 179 int century; 180 181 if (fmt != NULL) { 182 lt = localtime(&tval); 183 t = strptime(p, fmt, lt); 184 if (t == NULL) { 185 fprintf(stderr, "Failed conversion of ``%s''" 186 " using format ``%s''\n", p, fmt); 187 badformat(); 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 century = 0; 216 /* if p has a ".ss" field then let's pretend it's not there */ 217 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 218 case 12: /* cc */ 219 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 220 century = 1; 221 /* FALLTHROUGH */ 222 case 10: /* yy */ 223 if (century) 224 lt->tm_year += ATOI2(p); 225 else { /* hack for 2000 ;-} */ 226 lt->tm_year = ATOI2(p); 227 if (lt->tm_year < 69) 228 lt->tm_year += 2000 - TM_YEAR_BASE; 229 else 230 lt->tm_year += 1900 - TM_YEAR_BASE; 231 } 232 /* FALLTHROUGH */ 233 case 8: /* mm */ 234 lt->tm_mon = ATOI2(p); 235 if (lt->tm_mon > 12) 236 badformat(); 237 --lt->tm_mon; /* time struct is 0 - 11 */ 238 /* FALLTHROUGH */ 239 case 6: /* dd */ 240 lt->tm_mday = ATOI2(p); 241 if (lt->tm_mday > 31) 242 badformat(); 243 /* FALLTHROUGH */ 244 case 4: /* HH */ 245 lt->tm_hour = ATOI2(p); 246 if (lt->tm_hour > 23) 247 badformat(); 248 /* FALLTHROUGH */ 249 case 2: /* MM */ 250 lt->tm_min = ATOI2(p); 251 if (lt->tm_min > 59) 252 badformat(); 253 break; 254 default: 255 badformat(); 256 } 257 } 258 259 /* Let mktime() decide whether summer time is in effect. */ 260 lt->tm_isdst = -1; 261 262 /* convert broken-down time to GMT clock time */ 263 if ((tval = mktime(lt)) == -1) 264 errx(1, "nonexistent time"); 265 266 if (!jflag) { 267 /* set the time */ 268 if (nflag || netsettime(tval)) { 269 logwtmp("|", "date", ""); 270 tv.tv_sec = tval; 271 tv.tv_usec = 0; 272 if (settimeofday(&tv, (struct timezone *)NULL)) 273 err(1, "settimeofday (timeval)"); 274 logwtmp("{", "date", ""); 275 } 276 277 if ((p = getlogin()) == NULL) 278 p = "???"; 279 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 280 } 281 } 282 283 static void 284 badformat(void) 285 { 286 warnx("illegal time format"); 287 usage(); 288 } 289 290 static void 291 usage(void) 292 { 293 (void)fprintf(stderr, "%s\n%s\n", 294 "usage: date [-jnu] [-d dst] [-r seconds] [-t west] " 295 "[-v[+|-]val[ymwdHMS]] ... ", 296 " " 297 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 298 exit(1); 299 } 300