date.c revision 1.6
1 /* 2 * Copyright (c) 1985, 1987, 1988 The Regents of the University of California. 3 * 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 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1985, 1987, 1988 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)date.c 5.5 (Berkeley) 3/18/91";*/ 42 static char rcsid[] = "$Id: date.c,v 1.6 1993/08/16 23:08:52 jtc Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/file.h> 48 #include <syslog.h> 49 #include <unistd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <ctype.h> 54 55 time_t tval; 56 int retval, nflag; 57 58 main(argc, argv) 59 int argc; 60 char **argv; 61 { 62 extern int optind; 63 extern char *optarg; 64 struct timezone tz; 65 int ch, rflag; 66 char *format, buf[1024]; 67 68 tz.tz_dsttime = tz.tz_minuteswest = 0; 69 rflag = 0; 70 while ((ch = getopt(argc, argv, "d:nr:ut:")) != EOF) 71 switch((char)ch) { 72 case 'd': /* daylight savings time */ 73 tz.tz_dsttime = atoi(optarg) ? 1 : 0; 74 break; 75 case 'n': /* don't set network */ 76 nflag = 1; 77 break; 78 case 'r': /* user specified seconds */ 79 rflag = 1; 80 tval = atol(optarg); 81 break; 82 case 'u': /* do everything in GMT */ 83 (void)setenv("TZ", "GMT0", 1); 84 break; 85 case 't': /* minutes west of GMT */ 86 /* error check; don't allow "PST" */ 87 if (isdigit(*optarg)) { 88 tz.tz_minuteswest = atoi(optarg); 89 break; 90 } 91 /* FALLTHROUGH */ 92 default: 93 usage(); 94 } 95 argc -= optind; 96 argv += optind; 97 98 /* 99 * If -d or -t, set the timezone or daylight savings time; this 100 * doesn't belong here, there kernel should not know about either. 101 */ 102 if ((tz.tz_minuteswest || tz.tz_dsttime) && 103 settimeofday((struct timeval *)NULL, &tz)) { 104 perror("date: settimeofday"); 105 exit(1); 106 } 107 108 if (!rflag && time(&tval) == -1) { 109 perror("date: time"); 110 exit(1); 111 } 112 113 format = "%a %b %e %H:%M:%S %Z %Y"; 114 115 /* allow the operands in any order */ 116 if (*argv && **argv == '+') { 117 format = *argv + 1; 118 ++argv; 119 } 120 121 if (*argv) { 122 setthetime(*argv); 123 ++argv; 124 } 125 126 if (*argv && **argv == '+') 127 format = *argv + 1; 128 129 (void)strftime(buf, sizeof(buf), format, localtime(&tval)); 130 (void)printf("%s\n", buf); 131 exit(retval); 132 } 133 134 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 135 setthetime(p) 136 register char *p; 137 { 138 register struct tm *lt; 139 struct timeval tv; 140 int dot; 141 char *t; 142 143 for (t = p, dot = 0; *t; ++t) 144 if (!isdigit(*t) && (*t != '.' || dot++)) 145 badformat(); 146 147 lt = localtime(&tval); 148 149 if (t = index(p, '.')) { /* .ss */ 150 *t++ = '\0'; 151 lt->tm_sec = ATOI2(t); 152 if (lt->tm_sec > 61) 153 badformat(); 154 } else 155 lt->tm_sec = 0; 156 157 for (t = p; *t; ++t) 158 if (!isdigit(*t)) 159 badformat(); 160 161 switch (strlen(p)) { 162 case 10: /* yy */ 163 lt->tm_year = ATOI2(p); 164 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 165 lt->tm_year += 100; 166 /* FALLTHROUGH */ 167 case 8: /* mm */ 168 lt->tm_mon = ATOI2(p); 169 if (lt->tm_mon > 12) 170 badformat(); 171 --lt->tm_mon; /* time struct is 0 - 11 */ 172 /* FALLTHROUGH */ 173 case 6: /* dd */ 174 lt->tm_mday = ATOI2(p); 175 if (lt->tm_mday > 31) 176 badformat(); 177 /* FALLTHROUGH */ 178 case 4: /* hh */ 179 lt->tm_hour = ATOI2(p); 180 if (lt->tm_hour > 23) 181 badformat(); 182 /* FALLTHROUGH */ 183 case 2: /* mm */ 184 lt->tm_min = ATOI2(p); 185 if (lt->tm_min > 59) 186 badformat(); 187 break; 188 default: 189 badformat(); 190 } 191 192 /* convert broken-down time to GMT clock time */ 193 if ((tval = mktime(lt)) == -1) 194 badformat(); 195 196 if (!(p = getlogin())) /* single-user or no tty */ 197 p = "root"; 198 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 199 200 /* set the time */ 201 if (nflag || netsettime(tval)) { 202 logwtmp("|", "date", ""); 203 tv.tv_sec = tval; 204 tv.tv_usec = 0; 205 if (settimeofday(&tv, (struct timezone *)NULL)) { 206 perror("date: settimeofday"); 207 exit(1); 208 } 209 logwtmp("{", "date", ""); 210 } 211 } 212 213 badformat() 214 { 215 (void)fprintf(stderr, "date: illegal time format.\n"); 216 usage(); 217 } 218 219 usage() 220 { 221 (void)fprintf(stderr, 222 "usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n"); 223 (void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n"); 224 exit(1); 225 } 226
Indexes created Fri Sep 26 08:10:20 GMT 2025