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 1.13 2005/07/20 19:51:56 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 <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 setenv("TZ", "UTC0", 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 = nl_langinfo(_DATE_FMT); 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, jflag, nflag); 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 strftime(buf, sizeof(buf), format, <); 168 printf("%s\n", buf); 169 if (fflush(stdout) != 0) 170 err(1, "stdout"); 171 exit(retval); 172 } 173 174 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 175 176 static void 177 setthetime(const char *fmt, const char *p, int jflag, int nflag) 178 { 179 struct tm *lt; 180 struct timeval tv; 181 const char *dot, *t; 182 int century; 183 184 if (fmt != NULL) { 185 lt = localtime(&tval); 186 t = strptime(p, fmt, lt); 187 if (t == NULL) { 188 fprintf(stderr, "Failed conversion of ``%s''" 189 " using format ``%s''\n", p, fmt); 190 badformat(); 191 } else if (*t != '\0') 192 fprintf(stderr, "Warning: Ignoring %ld extraneous" 193 " characters in date string (%s)\n", 194 (long) strlen(t), t); 195 } else { 196 for (t = p, dot = NULL; *t; ++t) { 197 if (isdigit(*t)) 198 continue; 199 if (*t == '.' && dot == NULL) { 200 dot = t; 201 continue; 202 } 203 badformat(); 204 } 205 206 lt = localtime(&tval); 207 208 if (dot != NULL) { /* .ss */ 209 dot++; /* *dot++ = '\0'; */ 210 if (strlen(dot) != 2) 211 badformat(); 212 lt->tm_sec = ATOI2(dot); 213 if (lt->tm_sec > 61) 214 badformat(); 215 } else 216 lt->tm_sec = 0; 217 218 century = 0; 219 /* if p has a ".ss" field then let's pretend it's not there */ 220 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 221 case 12: /* cc */ 222 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 223 century = 1; 224 /* FALLTHROUGH */ 225 case 10: /* yy */ 226 if (century) 227 lt->tm_year += ATOI2(p); 228 else { /* hack for 2000 ;-} */ 229 lt->tm_year = ATOI2(p); 230 if (lt->tm_year < 69) 231 lt->tm_year += 2000 - TM_YEAR_BASE; 232 else 233 lt->tm_year += 1900 - TM_YEAR_BASE; 234 } 235 /* FALLTHROUGH */ 236 case 8: /* mm */ 237 lt->tm_mon = ATOI2(p); 238 if (lt->tm_mon > 12) 239 badformat(); 240 --lt->tm_mon; /* time struct is 0 - 11 */ 241 /* FALLTHROUGH */ 242 case 6: /* dd */ 243 lt->tm_mday = ATOI2(p); 244 if (lt->tm_mday > 31) 245 badformat(); 246 /* FALLTHROUGH */ 247 case 4: /* HH */ 248 lt->tm_hour = ATOI2(p); 249 if (lt->tm_hour > 23) 250 badformat(); 251 /* FALLTHROUGH */ 252 case 2: /* MM */ 253 lt->tm_min = ATOI2(p); 254 if (lt->tm_min > 59) 255 badformat(); 256 break; 257 default: 258 badformat(); 259 } 260 } 261 262 /* Let mktime() decide whether summer time is in effect. */ 263 lt->tm_isdst = -1; 264 265 /* convert broken-down time to GMT clock time */ 266 if ((tval = mktime(lt)) == -1) 267 errx(1, "nonexistent time"); 268 269 if (!jflag) { 270 /* set the time */ 271 if (nflag || netsettime(tval)) { 272 logwtmp("|", "date", ""); 273 tv.tv_sec = tval; 274 tv.tv_usec = 0; 275 if (settimeofday(&tv, (struct timezone *)NULL)) 276 err(1, "settimeofday (timeval)"); 277 logwtmp("{", "date", ""); 278 } 279 280 if ((p = getlogin()) == NULL) 281 p = "???"; 282 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 283 } 284 } 285 286 static void 287 badformat(void) 288 { 289 warnx("illegal time format"); 290 usage(); 291 } 292 293 static void 294 usage(void) 295 { 296 fprintf(stderr, "%s\n%s\n", 297 "usage: date [-jnu] [-d dst] [-r seconds] [-t west] " 298 "[-v[+|-]val[ymwdHMS]] ... ", 299 " " 300 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 301 exit(1); 302 } 303