date.c revision 1.16
1 /* $NetBSD: date.c,v 1.16 1997/11/05 21:20:51 cgd 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 46 #else 47 __RCSID("$NetBSD: date.c,v 1.16 1997/11/05 21:20:51 cgd Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/param.h> 52 #include <sys/time.h> 53 54 #include <ctype.h> 55 #include <err.h> 56 #include <fcntl.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <locale.h> 61 #include <syslog.h> 62 #include <unistd.h> 63 #include <util.h> 64 65 #include "extern.h" 66 67 time_t tval; 68 int retval, nflag; 69 70 int main __P((int, char *[])); 71 static void setthetime __P((char *)); 72 static void badformat __P((void)); 73 static void usage __P((void)); 74 75 int 76 main(argc, argv) 77 int argc; 78 char *argv[]; 79 { 80 extern int optind; 81 extern char *optarg; 82 int ch, rflag; 83 char *format, buf[1024]; 84 85 (void)setlocale(LC_ALL, ""); 86 87 rflag = 0; 88 while ((ch = getopt(argc, argv, "nr:u")) != -1) 89 switch((char)ch) { 90 case 'n': /* don't set network */ 91 nflag = 1; 92 break; 93 case 'r': /* user specified seconds */ 94 rflag = 1; 95 tval = atol(optarg); 96 break; 97 case 'u': /* do everything in GMT */ 98 (void)setenv("TZ", "GMT0", 1); 99 break; 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (!rflag && time(&tval) == -1) 107 err(1, "time"); 108 109 format = "%a %b %e %H:%M:%S %Z %Y"; 110 111 /* allow the operands in any order */ 112 if (*argv && **argv == '+') { 113 format = *argv + 1; 114 ++argv; 115 } 116 117 if (*argv) { 118 setthetime(*argv); 119 ++argv; 120 } 121 122 if (*argv && **argv == '+') 123 format = *argv + 1; 124 125 (void)strftime(buf, sizeof(buf), format, localtime(&tval)); 126 (void)printf("%s\n", buf); 127 exit(retval); 128 /* NOTREACHED */ 129 } 130 131 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 132 void 133 setthetime(p) 134 char *p; 135 { 136 struct tm *lt; 137 struct timeval tv; 138 char *dot, *t; 139 140 for (t = p, dot = NULL; *t; ++t) { 141 if (isdigit(*t)) 142 continue; 143 if (*t == '.' && dot == NULL) { 144 dot = t; 145 continue; 146 } 147 badformat(); 148 } 149 150 lt = localtime(&tval); 151 152 if (dot != NULL) { /* .ss */ 153 *dot++ = '\0'; 154 if (strlen(dot) != 2) 155 badformat(); 156 lt->tm_sec = ATOI2(dot); 157 if (lt->tm_sec > 61) 158 badformat(); 159 } else 160 lt->tm_sec = 0; 161 162 switch (strlen(p)) { 163 case 10: /* yy */ 164 lt->tm_year = ATOI2(p); 165 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 166 lt->tm_year += 100; 167 /* FALLTHROUGH */ 168 case 8: /* mm */ 169 lt->tm_mon = ATOI2(p); 170 if (lt->tm_mon > 12) 171 badformat(); 172 --lt->tm_mon; /* time struct is 0 - 11 */ 173 /* FALLTHROUGH */ 174 case 6: /* dd */ 175 lt->tm_mday = ATOI2(p); 176 if (lt->tm_mday > 31) 177 badformat(); 178 /* FALLTHROUGH */ 179 case 4: /* hh */ 180 lt->tm_hour = ATOI2(p); 181 if (lt->tm_hour > 23) 182 badformat(); 183 /* FALLTHROUGH */ 184 case 2: /* mm */ 185 lt->tm_min = ATOI2(p); 186 if (lt->tm_min > 59) 187 badformat(); 188 break; 189 default: 190 badformat(); 191 } 192 193 /* convert broken-down time to GMT clock time */ 194 if ((tval = mktime(lt)) == -1) 195 badformat(); 196 197 /* set the time */ 198 if (nflag || netsettime(tval)) { 199 logwtmp("|", "date", ""); 200 tv.tv_sec = tval; 201 tv.tv_usec = 0; 202 if (settimeofday(&tv, NULL)) { 203 perror("date: settimeofday"); 204 exit(1); 205 } 206 logwtmp("{", "date", ""); 207 } 208 209 if ((p = getlogin()) == NULL) 210 p = "???"; 211 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 212 } 213 214 static void 215 badformat() 216 { 217 warnx("illegal time format"); 218 usage(); 219 } 220 221 static void 222 usage() 223 { 224 (void)fprintf(stderr, 225 "usage: date [-nu] [-r seconds] [+format]\n"); 226 (void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n"); 227 exit(1); 228 } 229
Indexes created Fri Sep 26 08:10:20 GMT 2025