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 5.6 (Berkeley) 10/17/91"; 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 <unistd.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <ctype.h> 27 28 time_t tval; 29 int retval, nflag; 30 31 main(argc, argv) 32 int argc; 33 char **argv; 34 { 35 extern int optind; 36 extern char *optarg; 37 struct timezone tz; 38 int ch, rflag; 39 char *format, buf[1024]; 40 41 tz.tz_dsttime = tz.tz_minuteswest = 0; 42 rflag = 0; 43 while ((ch = getopt(argc, argv, "d:nr:ut:")) != EOF) 44 switch((char)ch) { 45 case 'd': /* daylight savings time */ 46 tz.tz_dsttime = atoi(optarg) ? 1 : 0; 47 break; 48 case 'n': /* don't set network */ 49 nflag = 1; 50 break; 51 case 'r': /* user specified seconds */ 52 rflag = 1; 53 tval = atol(optarg); 54 break; 55 case 'u': /* do everything in GMT */ 56 (void)setenv("TZ", "GMT0", 1); 57 break; 58 case 't': /* minutes west of GMT */ 59 /* error check; don't allow "PST" */ 60 if (isdigit(*optarg)) { 61 tz.tz_minuteswest = atoi(optarg); 62 break; 63 } 64 /* FALLTHROUGH */ 65 default: 66 usage(); 67 } 68 argc -= optind; 69 argv += optind; 70 71 /* 72 * If -d or -t, set the timezone or daylight savings time; this 73 * doesn't belong here, there kernel should not know about either. 74 */ 75 if ((tz.tz_minuteswest || tz.tz_dsttime) && 76 settimeofday(NULL, &tz)) { 77 perror("date: settimeofday"); 78 exit(1); 79 } 80 81 if (!rflag && time(&tval) == -1) { 82 perror("date: time"); 83 exit(1); 84 } 85 86 format = "%a %b %e %H:%M:%S %Z %Y\n"; 87 88 /* allow the operands in any order */ 89 if (*argv && **argv == '+') { 90 format = *argv + 1; 91 ++argv; 92 } 93 94 if (*argv) { 95 setthetime(*argv); 96 ++argv; 97 } 98 99 if (*argv && **argv == '+') 100 format = *argv + 1; 101 102 (void)strftime(buf, sizeof(buf), format, localtime(&tval)); 103 (void)printf("%s", buf); 104 exit(retval); 105 } 106 107 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 108 setthetime(p) 109 register char *p; 110 { 111 register struct tm *lt; 112 struct timeval tv; 113 int dot; 114 char *t; 115 116 for (t = p, dot = 0; *t; ++t) 117 if (!isdigit(*t) && (*t != '.' || dot++)) 118 badformat(); 119 120 lt = localtime(&tval); 121 122 if (t = index(p, '.')) { /* .ss */ 123 *t++ = '\0'; 124 if (lt->tm_sec > 61) 125 badformat(); 126 } else 127 lt->tm_sec = 0; 128 129 for (t = p; *t; ++t) 130 if (!isdigit(*t)) 131 badformat(); 132 133 switch (strlen(p)) { 134 case 10: /* yy */ 135 lt->tm_year = ATOI2(p); 136 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 137 lt->tm_year += 100; 138 /* FALLTHROUGH */ 139 case 8: /* mm */ 140 lt->tm_mon = ATOI2(p); 141 if (lt->tm_mon > 12) 142 badformat(); 143 --lt->tm_mon; /* time struct is 0 - 11 */ 144 /* FALLTHROUGH */ 145 case 6: /* dd */ 146 lt->tm_mday = ATOI2(p); 147 if (lt->tm_mday > 31) 148 badformat(); 149 /* FALLTHROUGH */ 150 case 4: /* hh */ 151 lt->tm_hour = ATOI2(p); 152 if (lt->tm_hour > 23) 153 badformat(); 154 /* FALLTHROUGH */ 155 case 2: /* mm */ 156 lt->tm_min = ATOI2(p); 157 if (lt->tm_min > 59) 158 badformat(); 159 break; 160 default: 161 badformat(); 162 } 163 164 /* convert broken-down time to GMT clock time */ 165 if ((tval = mktime(lt)) == -1) 166 badformat(); 167 168 /* set the time */ 169 if (nflag || netsettime(tval)) { 170 logwtmp("|", "date", ""); 171 tv.tv_sec = tval; 172 tv.tv_usec = 0; 173 if (settimeofday(&tv, NULL)) { 174 perror("date: settimeofday"); 175 exit(1); 176 } 177 logwtmp("{", "date", ""); 178 } 179 180 if ((p = getlogin()) == NULL) 181 p = "???"; 182 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 183 } 184 185 badformat() 186 { 187 (void)fprintf(stderr, "date: illegal time format.\n"); 188 usage(); 189 } 190 191 usage() 192 { 193 (void)fprintf(stderr, 194 "usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n"); 195 (void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n"); 196 exit(1); 197 } 198