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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1985, 1987, 1988, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)date.c 8.2 (Berkeley) 4/28/95 31 * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $ 32 * $DragonFly: src/bin/date/date.c,v 1.14 2006/01/12 13:43:10 corecode Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/time.h> 37 38 #include <ctype.h> 39 #include <err.h> 40 #include <langinfo.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <syslog.h> 45 #include <unistd.h> 46 #include <locale.h> 47 #include <libutil.h> 48 49 #include "extern.h" 50 #include "vary.h" 51 52 #ifndef TM_YEAR_BASE 53 #define TM_YEAR_BASE 1900 54 #endif 55 56 static time_t tval; 57 int retval; 58 59 static void setthetime(const char *, const char *, int, int); 60 static void badformat(void); 61 static void usage(void); 62 63 int 64 main(int argc, char **argv) 65 { 66 struct timezone tz; 67 int ch, rflag; 68 int jflag, nflag; 69 const char *format; 70 char buf[1024]; 71 char *endptr, *fmt; 72 char *tmp; 73 int set_timezone; 74 struct vary *v; 75 const struct vary *badv; 76 struct tm lt; 77 78 v = NULL; 79 fmt = NULL; 80 setlocale(LC_TIME, ""); 81 tz.tz_dsttime = tz.tz_minuteswest = 0; 82 rflag = 0; 83 jflag = nflag = 0; 84 set_timezone = 0; 85 while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1) 86 switch(ch) { 87 case 'd': /* daylight savings time */ 88 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 89 if (endptr == optarg || *endptr != '\0') 90 usage(); 91 set_timezone = 1; 92 break; 93 case 'f': 94 fmt = optarg; 95 break; 96 case 'j': 97 jflag = 1; /* don't set time */ 98 break; 99 case 'n': /* don't set network */ 100 nflag = 1; 101 break; 102 case 'r': /* user specified seconds */ 103 rflag = 1; 104 tval = strtoll(optarg, &tmp, 0); 105 if (*tmp != 0) 106 usage(); 107 break; 108 case 't': /* minutes west of UTC */ 109 /* error check; don't allow "PST" */ 110 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 111 if (endptr == optarg || *endptr != '\0') 112 usage(); 113 set_timezone = 1; 114 break; 115 case 'u': /* do everything in UTC */ 116 if (setenv("TZ", "UTC0", 1) != 0) 117 err(1, "setenv: cannot set TZ=UTC0"); 118 break; 119 case 'v': 120 v = vary_append(v, optarg); 121 break; 122 default: 123 usage(); 124 } 125 argc -= optind; 126 argv += optind; 127 128 /* 129 * If -d or -t, set the timezone or daylight savings time; this 130 * doesn't belong here; the kernel should not know about either. 131 */ 132 if (set_timezone && settimeofday(NULL, &tz)) 133 err(1, "settimeofday (timezone)"); 134 135 if (!rflag && time(&tval) == -1) 136 err(1, "time"); 137 138 format = nl_langinfo(_DATE_FMT); 139 140 /* allow the operands in any order */ 141 if (*argv && **argv == '+') { 142 format = *argv + 1; 143 ++argv; 144 } 145 146 if (*argv) { 147 setthetime(fmt, *argv, jflag, nflag); 148 ++argv; 149 } else if (fmt != NULL) 150 usage(); 151 152 if (*argv && **argv == '+') 153 format = *argv + 1; 154 155 lt = *localtime(&tval); 156 badv = vary_apply(v, <); 157 if (badv) { 158 fprintf(stderr, "%s: Cannot apply date adjustment\n", 159 badv->arg); 160 vary_destroy(v); 161 usage(); 162 } 163 vary_destroy(v); 164 strftime(buf, sizeof(buf), format, <); 165 printf("%s\n", buf); 166 if (fflush(stdout) != 0) 167 err(1, "stdout"); 168 exit(retval); 169 } 170 171 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 172 173 static void 174 setthetime(const char *fmt, const char *p, int jflag, int nflag) 175 { 176 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, 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 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