date.c revision 1.51
1 /* $NetBSD: date.c,v 1.51 2008/02/24 04:49:45 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1987, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT( 35 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"); 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 42 #else 43 __RCSID("$NetBSD: date.c,v 1.51 2008/02/24 04:49:45 dholland Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/param.h> 48 #include <sys/time.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <fcntl.h> 53 #include <locale.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <time.h> 59 #include <tzfile.h> 60 #include <unistd.h> 61 #include <util.h> 62 63 #include "extern.h" 64 65 static time_t tval; 66 static int aflag, jflag, rflag, nflag; 67 int retval; 68 69 static void badformat(void); 70 static void badtime(void); 71 static void badvalue(const char *); 72 static void setthetime(const char *); 73 static void usage(void); 74 75 int 76 main(int argc, char *argv[]) 77 { 78 char *buf; 79 size_t bufsiz; 80 const char *format; 81 int ch; 82 83 setprogname(argv[0]); 84 (void)setlocale(LC_ALL, ""); 85 86 while ((ch = getopt(argc, argv, "ad:jnr:u")) != -1) { 87 switch (ch) { 88 case 'a': /* adjust time slowly */ 89 aflag = 1; 90 nflag = 1; 91 break; 92 case 'd': 93 rflag = 1; 94 tval = parsedate(optarg, NULL, NULL); 95 if (tval == -1) 96 errx(1, "Cannot parse `%s'", optarg); 97 break; 98 case 'j': /* don't set time */ 99 jflag = 1; 100 break; 101 case 'n': /* don't set network */ 102 nflag = 1; 103 break; 104 case 'r': /* user specified seconds */ 105 rflag = 1; 106 tval = strtoll(optarg, NULL, 0); 107 break; 108 case 'u': /* do everything in UTC */ 109 (void)putenv("TZ=UTC0"); 110 break; 111 default: 112 usage(); 113 } 114 } 115 argc -= optind; 116 argv += optind; 117 118 if (!rflag && time(&tval) == -1) 119 err(EXIT_FAILURE, "time"); 120 121 format = "%a %b %e %H:%M:%S %Z %Y"; 122 123 /* allow the operands in any order */ 124 if (*argv && **argv == '+') { 125 format = *argv + 1; 126 ++argv; 127 } 128 129 if (*argv) { 130 setthetime(*argv); 131 ++argv; 132 } 133 134 if (*argv && **argv == '+') 135 format = *argv + 1; 136 137 if ((buf = malloc(bufsiz = 1024)) == NULL) 138 goto bad; 139 while (strftime(buf, bufsiz, format, localtime(&tval)) == 0) 140 if ((buf = realloc(buf, bufsiz <<= 1)) == NULL) 141 goto bad; 142 (void)printf("%s\n", buf); 143 free(buf); 144 return 0; 145 bad: 146 err(1, "Cannot allocate format buffer"); 147 } 148 149 static void 150 badformat(void) 151 { 152 warnx("illegal time format"); 153 usage(); 154 } 155 156 static void 157 badtime(void) 158 { 159 errx(EXIT_FAILURE, "illegal time"); 160 /* NOTREACHED */ 161 } 162 163 static void 164 badvalue(const char *param) 165 { 166 warnx("invalid %s supplied", param); 167 usage(); 168 } 169 170 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 171 172 static void 173 setthetime(const char *p) 174 { 175 struct timeval tv; 176 time_t new_time; 177 struct tm *lt; 178 const char *dot, *t; 179 size_t len; 180 int yearset; 181 182 for (t = p, dot = NULL; *t; ++t) { 183 if (isdigit((unsigned char)*t)) 184 continue; 185 if (*t == '.' && dot == NULL) { 186 dot = t; 187 continue; 188 } 189 badformat(); 190 } 191 192 lt = localtime(&tval); 193 194 lt->tm_isdst = -1; /* Divine correct DST */ 195 196 if (dot != NULL) { /* .ss */ 197 len = strlen(dot); 198 if (len != 3) 199 badformat(); 200 ++dot; 201 lt->tm_sec = ATOI2(dot); 202 if (lt->tm_sec > 61) 203 badvalue("seconds"); 204 } else { 205 len = 0; 206 lt->tm_sec = 0; 207 } 208 209 yearset = 0; 210 switch (strlen(p) - len) { 211 case 12: /* cc */ 212 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 213 if (lt->tm_year < 0) 214 badtime(); 215 yearset = 1; 216 /* FALLTHROUGH */ 217 case 10: /* yy */ 218 if (yearset) { 219 lt->tm_year += ATOI2(p); 220 } else { 221 yearset = ATOI2(p); 222 if (yearset < 69) 223 lt->tm_year = yearset + 2000 - TM_YEAR_BASE; 224 else 225 lt->tm_year = yearset + 1900 - TM_YEAR_BASE; 226 } 227 /* FALLTHROUGH */ 228 case 8: /* mm */ 229 lt->tm_mon = ATOI2(p); 230 if (lt->tm_mon > 12 || lt->tm_mon == 0) 231 badvalue("month"); 232 --lt->tm_mon; /* time struct is 0 - 11 */ 233 /* FALLTHROUGH */ 234 case 6: /* dd */ 235 lt->tm_mday = ATOI2(p); 236 switch (lt->tm_mon) { 237 case 0: 238 case 2: 239 case 4: 240 case 6: 241 case 7: 242 case 9: 243 case 11: 244 if (lt->tm_mday > 31 || lt->tm_mday == 0) 245 badvalue("day of month"); 246 break; 247 case 3: 248 case 5: 249 case 8: 250 case 10: 251 if (lt->tm_mday > 30 || lt->tm_mday == 0) 252 badvalue("day of month"); 253 break; 254 case 1: 255 if (lt->tm_mday > 29 || lt->tm_mday == 0 || 256 (lt->tm_mday == 29 && 257 !isleap(lt->tm_year + TM_YEAR_BASE))) 258 badvalue("day of month"); 259 break; 260 default: 261 badvalue("month"); 262 break; 263 } 264 /* FALLTHROUGH */ 265 case 4: /* hh */ 266 lt->tm_hour = ATOI2(p); 267 if (lt->tm_hour > 23) 268 badvalue("hour"); 269 /* FALLTHROUGH */ 270 case 2: /* mm */ 271 lt->tm_min = ATOI2(p); 272 if (lt->tm_min > 59) 273 badvalue("minute"); 274 break; 275 case 0: /* was just .sss */ 276 if (len != 0) 277 break; 278 /* FALLTHROUGH */ 279 default: 280 badformat(); 281 } 282 283 /* convert broken-down time to UTC clock time */ 284 if ((new_time = mktime(lt)) == -1) 285 badtime(); 286 287 /* if jflag is set, don't actually change the time, just return */ 288 if (jflag) { 289 tval = new_time; 290 return; 291 } 292 293 /* set the time */ 294 if (nflag || netsettime(new_time)) { 295 logwtmp("|", "date", ""); 296 if (aflag) { 297 tv.tv_sec = new_time - tval; 298 tv.tv_usec = 0; 299 if (adjtime(&tv, NULL)) 300 err(EXIT_FAILURE, "adjtime"); 301 } else { 302 tval = new_time; 303 tv.tv_sec = tval; 304 tv.tv_usec = 0; 305 if (settimeofday(&tv, NULL)) 306 err(EXIT_FAILURE, "settimeofday"); 307 } 308 logwtmp("{", "date", ""); 309 } 310 311 if ((p = getlogin()) == NULL) 312 p = "???"; 313 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 314 } 315 316 static void 317 usage(void) 318 { 319 (void)fprintf(stderr, 320 "usage: %s [-ajnu] [-d date] [-r seconds] [+format]", getprogname()); 321 (void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n"); 322 exit(EXIT_FAILURE); 323 /* NOTREACHED */ 324 } 325
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