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. 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 */ 33 34 #include <sys/param.h> 35 #include <sys/time.h> 36 37 #include <ctype.h> 38 #include <err.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <syslog.h> 43 #include <unistd.h> 44 #include <locale.h> 45 #include <libutil.h> 46 47 #include "extern.h" 48 #include "vary.h" 49 50 #ifndef TM_YEAR_BASE 51 #define TM_YEAR_BASE 1900 52 #endif 53 54 static time_t tval; 55 int retval; 56 57 static void setthetime(const char *, const char *, int, int); 58 static void badformat(void); 59 static void usage(void); 60 61 int 62 main(int argc, char **argv) 63 { 64 struct timezone tz; 65 int ch, rflag; 66 int jflag, nflag; 67 const char *format; 68 char buf[1024]; 69 char *endptr, *fmt; 70 char *tmp; 71 int set_timezone; 72 struct vary *v; 73 const struct vary *badv; 74 struct tm lt; 75 76 v = NULL; 77 fmt = NULL; 78 setlocale(LC_TIME, ""); 79 tz.tz_dsttime = tz.tz_minuteswest = 0; 80 rflag = 0; 81 jflag = nflag = 0; 82 set_timezone = 0; 83 while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1) 84 switch(ch) { 85 case 'd': /* daylight savings time */ 86 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 87 if (endptr == optarg || *endptr != '\0') 88 usage(); 89 set_timezone = 1; 90 break; 91 case 'f': 92 fmt = optarg; 93 break; 94 case 'j': 95 jflag = 1; /* don't set time */ 96 break; 97 case 'n': /* don't set network */ 98 nflag = 1; 99 break; 100 case 'r': /* user specified seconds */ 101 rflag = 1; 102 tval = strtoll(optarg, &tmp, 0); 103 if (*tmp != 0) 104 usage(); 105 break; 106 case 't': /* minutes west of UTC */ 107 /* error check; don't allow "PST" */ 108 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 109 if (endptr == optarg || *endptr != '\0') 110 usage(); 111 set_timezone = 1; 112 break; 113 case 'u': /* do everything in UTC */ 114 if (setenv("TZ", "UTC0", 1) != 0) 115 err(1, "setenv: cannot set TZ=UTC0"); 116 break; 117 case 'v': 118 v = vary_append(v, optarg); 119 break; 120 default: 121 usage(); 122 } 123 argc -= optind; 124 argv += optind; 125 126 /* 127 * If -d or -t, set the timezone or daylight savings time; this 128 * doesn't belong here; the kernel should not know about either. 129 */ 130 if (set_timezone && settimeofday(NULL, &tz)) 131 err(1, "settimeofday (timezone)"); 132 133 if (!rflag && time(&tval) == -1) 134 err(1, "time"); 135 136 format = "%+"; 137 138 /* allow the operands in any order */ 139 if (*argv && **argv == '+') { 140 format = *argv + 1; 141 ++argv; 142 } 143 144 if (*argv) { 145 setthetime(fmt, *argv, jflag, nflag); 146 ++argv; 147 } else if (fmt != NULL) 148 usage(); 149 150 if (*argv && **argv == '+') 151 format = *argv + 1; 152 153 lt = *localtime(&tval); 154 badv = vary_apply(v, <); 155 if (badv) { 156 fprintf(stderr, "%s: Cannot apply date adjustment\n", 157 badv->arg); 158 vary_destroy(v); 159 usage(); 160 } 161 vary_destroy(v); 162 strftime(buf, sizeof(buf), format, <); 163 printf("%s\n", buf); 164 if (fflush(stdout) != 0) 165 err(1, "stdout"); 166 exit(retval); 167 } 168 169 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 170 171 static void 172 setthetime(const char *fmt, const char *p, int jflag, int nflag) 173 { 174 struct tm *lt; 175 struct timeval tv; 176 const char *dot, *t; 177 int century; 178 179 if (fmt != NULL) { 180 lt = localtime(&tval); 181 t = strptime(p, fmt, lt); 182 if (t == NULL) { 183 fprintf(stderr, "Failed conversion of ``%s''" 184 " using format ``%s''\n", p, fmt); 185 badformat(); 186 } else if (*t != '\0') 187 fprintf(stderr, "Warning: Ignoring %ld extraneous" 188 " characters in date string (%s)\n", 189 (long) strlen(t), t); 190 } else { 191 for (t = p, dot = NULL; *t; ++t) { 192 if (isdigit(*t)) 193 continue; 194 if (*t == '.' && dot == NULL) { 195 dot = t; 196 continue; 197 } 198 badformat(); 199 } 200 201 lt = localtime(&tval); 202 203 if (dot != NULL) { /* .ss */ 204 dot++; /* *dot++ = '\0'; */ 205 if (strlen(dot) != 2) 206 badformat(); 207 lt->tm_sec = ATOI2(dot); 208 if (lt->tm_sec > 61) 209 badformat(); 210 } else 211 lt->tm_sec = 0; 212 213 century = 0; 214 /* if p has a ".ss" field then let's pretend it's not there */ 215 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 216 case 12: /* cc */ 217 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 218 century = 1; 219 /* FALLTHROUGH */ 220 case 10: /* yy */ 221 if (century) 222 lt->tm_year += ATOI2(p); 223 else { /* hack for 2000 ;-} */ 224 lt->tm_year = ATOI2(p); 225 if (lt->tm_year < 69) 226 lt->tm_year += 2000 - TM_YEAR_BASE; 227 else 228 lt->tm_year += 1900 - TM_YEAR_BASE; 229 } 230 /* FALLTHROUGH */ 231 case 8: /* mm */ 232 lt->tm_mon = ATOI2(p); 233 if (lt->tm_mon > 12) 234 badformat(); 235 --lt->tm_mon; /* time struct is 0 - 11 */ 236 /* FALLTHROUGH */ 237 case 6: /* dd */ 238 lt->tm_mday = ATOI2(p); 239 if (lt->tm_mday > 31) 240 badformat(); 241 /* FALLTHROUGH */ 242 case 4: /* HH */ 243 lt->tm_hour = ATOI2(p); 244 if (lt->tm_hour > 23) 245 badformat(); 246 /* FALLTHROUGH */ 247 case 2: /* MM */ 248 lt->tm_min = ATOI2(p); 249 if (lt->tm_min > 59) 250 badformat(); 251 break; 252 default: 253 badformat(); 254 } 255 } 256 257 /* Let mktime() decide whether summer time is in effect. */ 258 lt->tm_isdst = -1; 259 260 /* convert broken-down time to GMT clock time */ 261 if ((tval = mktime(lt)) == -1) 262 errx(1, "nonexistent time"); 263 264 if (!jflag) { 265 /* set the time */ 266 if (nflag || netsettime(tval)) { 267 logwtmp("|", "date", ""); 268 tv.tv_sec = tval; 269 tv.tv_usec = 0; 270 if (settimeofday(&tv, NULL)) 271 err(1, "settimeofday (timeval)"); 272 logwtmp("{", "date", ""); 273 } 274 275 if ((p = getlogin()) == NULL) 276 p = "???"; 277 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 278 } 279 } 280 281 static void 282 badformat(void) 283 { 284 warnx("illegal time format"); 285 usage(); 286 } 287 288 static void 289 usage(void) 290 { 291 fprintf(stderr, "%s\n%s\n", 292 "usage: date [-jnu] [-d dst] [-r seconds] [-t west] " 293 "[-v[+|-]val[ymwdHMS]] ... ", 294 " " 295 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 296 exit(1); 297 } 298