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 1.47 2005/01/10 08:39:21 imp Exp $ 36 * $DragonFly: src/bin/date/date.c,v 1.14 2006/01/12 13:43:10 corecode Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/time.h> 41 42 #include <ctype.h> 43 #include <err.h> 44 #include <langinfo.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <syslog.h> 49 #include <unistd.h> 50 #include <locale.h> 51 #include <libutil.h> 52 53 #include "extern.h" 54 #include "vary.h" 55 56 #ifndef TM_YEAR_BASE 57 #define TM_YEAR_BASE 1900 58 #endif 59 60 static time_t tval; 61 int retval; 62 63 static void setthetime(const char *, const char *, int, int); 64 static void badformat(void); 65 static void usage(void); 66 67 int 68 main(int argc, char **argv) 69 { 70 struct timezone tz; 71 int ch, rflag; 72 int jflag, nflag; 73 const char *format; 74 char buf[1024]; 75 char *endptr, *fmt; 76 char *tmp; 77 int set_timezone; 78 struct vary *v; 79 const struct vary *badv; 80 struct tm lt; 81 82 v = NULL; 83 fmt = NULL; 84 setlocale(LC_TIME, ""); 85 tz.tz_dsttime = tz.tz_minuteswest = 0; 86 rflag = 0; 87 jflag = nflag = 0; 88 set_timezone = 0; 89 while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1) 90 switch(ch) { 91 case 'd': /* daylight savings time */ 92 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 93 if (endptr == optarg || *endptr != '\0') 94 usage(); 95 set_timezone = 1; 96 break; 97 case 'f': 98 fmt = optarg; 99 break; 100 case 'j': 101 jflag = 1; /* don't set time */ 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 = strtoll(optarg, &tmp, 0); 109 if (*tmp != 0) 110 usage(); 111 break; 112 case 't': /* minutes west of UTC */ 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 UTC */ 120 if (setenv("TZ", "UTC0", 1) != 0) 121 err(1, "setenv: cannot set TZ=UTC0"); 122 break; 123 case 'v': 124 v = vary_append(v, optarg); 125 break; 126 default: 127 usage(); 128 } 129 argc -= optind; 130 argv += optind; 131 132 /* 133 * If -d or -t, set the timezone or daylight savings time; this 134 * doesn't belong here; the kernel should not know about either. 135 */ 136 if (set_timezone && settimeofday(NULL, &tz)) 137 err(1, "settimeofday (timezone)"); 138 139 if (!rflag && time(&tval) == -1) 140 err(1, "time"); 141 142 format = nl_langinfo(_DATE_FMT); 143 144 /* allow the operands in any order */ 145 if (*argv && **argv == '+') { 146 format = *argv + 1; 147 ++argv; 148 } 149 150 if (*argv) { 151 setthetime(fmt, *argv, jflag, nflag); 152 ++argv; 153 } else if (fmt != NULL) 154 usage(); 155 156 if (*argv && **argv == '+') 157 format = *argv + 1; 158 159 lt = *localtime(&tval); 160 badv = vary_apply(v, <); 161 if (badv) { 162 fprintf(stderr, "%s: Cannot apply date adjustment\n", 163 badv->arg); 164 vary_destroy(v); 165 usage(); 166 } 167 vary_destroy(v); 168 strftime(buf, sizeof(buf), format, <); 169 printf("%s\n", buf); 170 if (fflush(stdout) != 0) 171 err(1, "stdout"); 172 exit(retval); 173 } 174 175 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 176 177 static void 178 setthetime(const char *fmt, const char *p, int jflag, int nflag) 179 { 180 struct tm *lt; 181 struct timeval tv; 182 const char *dot, *t; 183 int century; 184 185 if (fmt != NULL) { 186 lt = localtime(&tval); 187 t = strptime(p, fmt, lt); 188 if (t == NULL) { 189 fprintf(stderr, "Failed conversion of ``%s''" 190 " using format ``%s''\n", p, fmt); 191 badformat(); 192 } else if (*t != '\0') 193 fprintf(stderr, "Warning: Ignoring %ld extraneous" 194 " characters in date string (%s)\n", 195 (long) strlen(t), t); 196 } else { 197 for (t = p, dot = NULL; *t; ++t) { 198 if (isdigit(*t)) 199 continue; 200 if (*t == '.' && dot == NULL) { 201 dot = t; 202 continue; 203 } 204 badformat(); 205 } 206 207 lt = localtime(&tval); 208 209 if (dot != NULL) { /* .ss */ 210 dot++; /* *dot++ = '\0'; */ 211 if (strlen(dot) != 2) 212 badformat(); 213 lt->tm_sec = ATOI2(dot); 214 if (lt->tm_sec > 61) 215 badformat(); 216 } else 217 lt->tm_sec = 0; 218 219 century = 0; 220 /* if p has a ".ss" field then let's pretend it's not there */ 221 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 222 case 12: /* cc */ 223 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 224 century = 1; 225 /* FALLTHROUGH */ 226 case 10: /* yy */ 227 if (century) 228 lt->tm_year += ATOI2(p); 229 else { /* hack for 2000 ;-} */ 230 lt->tm_year = ATOI2(p); 231 if (lt->tm_year < 69) 232 lt->tm_year += 2000 - TM_YEAR_BASE; 233 else 234 lt->tm_year += 1900 - TM_YEAR_BASE; 235 } 236 /* FALLTHROUGH */ 237 case 8: /* mm */ 238 lt->tm_mon = ATOI2(p); 239 if (lt->tm_mon > 12) 240 badformat(); 241 --lt->tm_mon; /* time struct is 0 - 11 */ 242 /* FALLTHROUGH */ 243 case 6: /* dd */ 244 lt->tm_mday = ATOI2(p); 245 if (lt->tm_mday > 31) 246 badformat(); 247 /* FALLTHROUGH */ 248 case 4: /* HH */ 249 lt->tm_hour = ATOI2(p); 250 if (lt->tm_hour > 23) 251 badformat(); 252 /* FALLTHROUGH */ 253 case 2: /* MM */ 254 lt->tm_min = ATOI2(p); 255 if (lt->tm_min > 59) 256 badformat(); 257 break; 258 default: 259 badformat(); 260 } 261 } 262 263 /* Let mktime() decide whether summer time is in effect. */ 264 lt->tm_isdst = -1; 265 266 /* convert broken-down time to GMT clock time */ 267 if ((tval = mktime(lt)) == -1) 268 errx(1, "nonexistent time"); 269 270 if (!jflag) { 271 /* set the time */ 272 if (nflag || netsettime(tval)) { 273 logwtmp("|", "date", ""); 274 tv.tv_sec = tval; 275 tv.tv_usec = 0; 276 if (settimeofday(&tv, NULL)) 277 err(1, "settimeofday (timeval)"); 278 logwtmp("{", "date", ""); 279 } 280 281 if ((p = getlogin()) == NULL) 282 p = "???"; 283 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 284 } 285 } 286 287 static void 288 badformat(void) 289 { 290 warnx("illegal time format"); 291 usage(); 292 } 293 294 static void 295 usage(void) 296 { 297 fprintf(stderr, "%s\n%s\n", 298 "usage: date [-jnu] [-d dst] [-r seconds] [-t west] " 299 "[-v[+|-]val[ymwdHMS]] ... ", 300 " " 301 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 302 exit(1); 303 } 304