1 /* 2 * Copyright (c) 1985, 1987, 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1985, 1987, 1988 The Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)date.c 4.28 (Berkeley) 12/04/90"; 16 #endif /* not lint */ 17 18 #include <sys/param.h> 19 #include <sys/time.h> 20 #include <sys/file.h> 21 #include <syslog.h> 22 #include <stdio.h> 23 #include <ctype.h> 24 #include <string.h> 25 #include <stdlib.h> 26 27 time_t tval; 28 int retval, nflag; 29 30 main(argc, argv) 31 int argc; 32 char **argv; 33 { 34 extern int optind; 35 extern char *optarg; 36 struct timezone tz; 37 int ch; 38 char *format, buf[1024]; 39 40 tz.tz_dsttime = tz.tz_minuteswest = 0; 41 while ((ch = getopt(argc, argv, "d:nut:")) != EOF) 42 switch((char)ch) { 43 case 'd': /* daylight savings time */ 44 tz.tz_dsttime = atoi(optarg) ? 1 : 0; 45 break; 46 case 'n': /* don't set network */ 47 nflag = 1; 48 break; 49 case 'u': /* do everything in GMT */ 50 (void)setenv("TZ", "GMT", 1); 51 break; 52 case 't': /* minutes west of GMT */ 53 /* error check; don't allow "PST" */ 54 if (isdigit(*optarg)) { 55 tz.tz_minuteswest = atoi(optarg); 56 break; 57 } 58 /* FALLTHROUGH */ 59 default: 60 usage(); 61 } 62 argc -= optind; 63 argv += optind; 64 65 /* 66 * If -d or -t, set the timezone or daylight savings time; this 67 * doesn't belong here, there kernel should not know about either. 68 */ 69 if ((tz.tz_minuteswest || tz.tz_dsttime) && 70 settimeofday((struct timeval *)NULL, &tz)) { 71 perror("date: settimeofday"); 72 exit(1); 73 } 74 75 if (time(&tval) == (time_t)-1) { 76 perror("date: time"); 77 exit(1); 78 } 79 80 format = "%a %b %e %H:%M:%S %Z %Y\n"; 81 82 /* allow the operands in any order */ 83 if (*argv && **argv == '+') { 84 format = *argv + 1; 85 ++argv; 86 } 87 88 if (*argv) { 89 setthetime(*argv); 90 ++argv; 91 } 92 93 if (*argv && **argv == '+') 94 format = *argv + 1; 95 96 (void)strftime(buf, sizeof(buf), format, localtime(&tval)); 97 (void)printf("%s", buf); 98 exit(retval); 99 } 100 101 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 102 setthetime(p) 103 register char *p; 104 { 105 register struct tm *lt; 106 struct timeval tv; 107 int dot; 108 char *t; 109 110 for (t = p, dot = 0; *t; ++t) 111 if (!isdigit(*t) && (*t != '.' || dot++)) 112 badformat(); 113 114 lt = localtime(&tval); 115 116 if (t = index(p, '.')) { /* .ss */ 117 *t++ = '\0'; 118 if (lt->tm_sec > 61) 119 badformat(); 120 } else 121 lt->tm_sec = 0; 122 123 for (t = p; *t; ++t) 124 if (!isdigit(*t)) 125 badformat(); 126 127 switch (strlen(p)) { 128 case 10: /* yy */ 129 lt->tm_year = ATOI2(p); 130 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 131 lt->tm_year += 100; 132 /* FALLTHROUGH */ 133 case 8: /* mm */ 134 lt->tm_mon = ATOI2(p); 135 if (lt->tm_mon > 12) 136 badformat(); 137 /* FALLTHROUGH */ 138 case 6: /* dd */ 139 lt->tm_mday = ATOI2(p); 140 if (lt->tm_mday > 31) 141 badformat(); 142 /* FALLTHROUGH */ 143 case 4: /* hh */ 144 lt->tm_hour = ATOI2(p); 145 if (lt->tm_hour > 23) 146 badformat(); 147 /* FALLTHROUGH */ 148 case 2: /* mm */ 149 lt->tm_min = ATOI2(p); 150 if (lt->tm_min > 59) 151 badformat(); 152 break; 153 default: 154 badformat(); 155 } 156 157 /* convert broken-down time to GMT clock time */ 158 if ((tval = mktime(lt)) == -1) 159 badformat(); 160 161 if (!(p = getlogin())) /* single-user or no tty */ 162 p = "root"; 163 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 164 165 /* set the time */ 166 if (nflag || netsettime(tval)) { 167 logwtmp("|", "date", ""); 168 tv.tv_sec = tval; 169 tv.tv_usec = 0; 170 if (settimeofday(&tv, (struct timezone *)NULL)) { 171 perror("date: settimeofday"); 172 exit(1); 173 } 174 logwtmp("{", "date", ""); 175 } 176 } 177 178 badformat() 179 { 180 (void)fprintf(stderr, "date: illegal time format.\n"); 181 usage(); 182 } 183 184 usage() 185 { 186 (void)fprintf(stderr, 187 "usage: date [-nu] [-d dst] [-t west] [+format] [yy[mm[dd[hh]]]]mm[.ss]]\n"); 188 exit(1); 189 } 190