projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 0698cf89 BJ |
1 | static char *sccsid = "@(#)date.c 4.1 (Berkeley) %G%"; |
| 2 | #include <stdio.h> | |
| 3 | /* | |
| 4 | * date : print date | |
| 5 | * date YYMMDDHHMM[.SS] : set date, if allowed | |
| 6 | * date -u ... : date in GMT | |
| 7 | */ | |
| 8 | #include <time.h> | |
| 9 | #include <sys/types.h> | |
| 10 | #include <sys/timeb.h> | |
| 11 | #include <utmp.h> | |
| 12 | long timbuf; | |
| 13 | char *ap, *ep, *sp; | |
| 14 | int uflag; | |
| 15 | ||
| 16 | char *timezone(); | |
| 17 | static int dmsize[12] = | |
| 18 | { | |
| 19 | 31, | |
| 20 | 28, | |
| 21 | 31, | |
| 22 | 30, | |
| 23 | 31, | |
| 24 | 30, | |
| 25 | 31, | |
| 26 | 31, | |
| 27 | 30, | |
| 28 | 31, | |
| 29 | 30, | |
| 30 | 31 | |
| 31 | }; | |
| 32 | ||
| 33 | struct utmp wtmp[2] = { {"|", "", 0}, {"{", "", 0}}; | |
| 34 | ||
| 35 | char *ctime(); | |
| 36 | char *asctime(); | |
| 37 | struct tm *localtime(); | |
| 38 | struct tm *gmtime(); | |
| 39 | ||
| 40 | main(argc, argv) | |
| 41 | char *argv[]; | |
| 42 | { | |
| 43 | register char *tzn; | |
| 44 | struct timeb info; | |
| 45 | int wf, rc; | |
| 46 | extern char _sobuf[]; | |
| 47 | ||
| 48 | setbuf(stdout, _sobuf); | |
| 49 | rc = 0; | |
| 50 | ftime(&info); | |
| 51 | if (argc>1 && argv[1][0]=='-' && argv[1][1]=='u') { | |
| 52 | argc--; | |
| 53 | argv++; | |
| 54 | uflag++; | |
| 55 | } | |
| 56 | if(argc > 1) { | |
| 57 | ap = argv[1]; | |
| 58 | if (gtime()) { | |
| 59 | printf("date: bad conversion\n"); | |
| 60 | exit(1); | |
| 61 | } | |
| 62 | /* convert to GMT assuming local time */ | |
| 63 | if (uflag==0) { | |
| 64 | timbuf += (long)info.timezone*60; | |
| 65 | /* now fix up local daylight time */ | |
| 66 | if(localtime(&timbuf)->tm_isdst) | |
| 67 | timbuf -= 60*60; | |
| 68 | } | |
| 69 | time(&wtmp[0].ut_time); | |
| 70 | if(stime(&timbuf) < 0) { | |
| 71 | rc++; | |
| 72 | printf("date: no permission\n"); | |
| 73 | } else if ((wf = open("/usr/adm/wtmp", 1)) >= 0) { | |
| 74 | time(&wtmp[1].ut_time); | |
| 75 | lseek(wf, 0L, 2); | |
| 76 | write(wf, (char *)wtmp, sizeof(wtmp)); | |
| 77 | close(wf); | |
| 78 | } | |
| 79 | } | |
| 80 | if (rc==0) | |
| 81 | time(&timbuf); | |
| 82 | if(uflag) { | |
| 83 | ap = asctime(gmtime(&timbuf)); | |
| 84 | tzn = "GMT"; | |
| 85 | } else { | |
| 86 | struct tm *tp; | |
| 87 | tp = localtime(&timbuf); | |
| 88 | ap = asctime(tp); | |
| 89 | tzn = timezone(info.timezone, tp->tm_isdst); | |
| 90 | } | |
| 91 | printf("%.20s", ap); | |
| 92 | if (tzn) | |
| 93 | printf("%s", tzn); | |
| 94 | printf("%s", ap+19); | |
| 95 | exit(rc); | |
| 96 | } | |
| 97 | ||
| 98 | gtime() | |
| 99 | { | |
| 100 | register int i, year, month; | |
| 101 | int day, hour, mins, secs; | |
| 102 | struct tm *L; | |
| 103 | char x; | |
| 104 | ||
| 105 | ep=ap; | |
| 106 | while(*ep) ep++; | |
| 107 | sp=ap; | |
| 108 | while(sp<ep) { | |
| 109 | x = *sp; | |
| 110 | *sp++ = *--ep; | |
| 111 | *ep = x; | |
| 112 | } | |
| 113 | sp=ap; | |
| 114 | time(&timbuf); | |
| 115 | L=localtime(&timbuf); | |
| 116 | secs = gp(-1); | |
| 117 | if(*sp!='.') { | |
| 118 | mins=secs; | |
| 119 | secs=0; | |
| 120 | } else {sp++; | |
| 121 | mins = gp(-1); | |
| 122 | } | |
| 123 | hour = gp(-1); | |
| 124 | day = gp(L->tm_mday); | |
| 125 | month = gp(L->tm_mon+1); | |
| 126 | year = gp(L->tm_year); | |
| 127 | if(*sp) | |
| 128 | return(1); | |
| 129 | if( month<1 || month>12 || | |
| 130 | day<1 || day>31 || | |
| 131 | mins<0 || mins>59 || | |
| 132 | secs<0 || secs>59) | |
| 133 | return(1); | |
| 134 | if (hour==24) { | |
| 135 | hour=0; day++; | |
| 136 | } | |
| 137 | if (hour<0 || hour>23) | |
| 138 | return(1); | |
| 139 | timbuf = 0; | |
| 140 | year += 1900; | |
| 141 | for(i=1970; i<year; i++) | |
| 142 | timbuf += dysize(i); | |
| 143 | /* Leap year */ | |
| 144 | if (dysize(year)==366 && month >= 3) | |
| 145 | timbuf++; | |
| 146 | while(--month) | |
| 147 | timbuf += dmsize[month-1]; | |
| 148 | timbuf += day-1; | |
| 149 | timbuf = 24*timbuf + hour; | |
| 150 | timbuf = 60*timbuf + mins; | |
| 151 | timbuf = 60*timbuf + secs; | |
| 152 | return(0); | |
| 153 | ||
| 154 | } | |
| 155 | ||
| 156 | gp(dfault) | |
| 157 | { | |
| 158 | register int c, d; | |
| 159 | ||
| 160 | if(*sp==0) | |
| 161 | return(dfault); | |
| 162 | c = (*sp++)-'0'; | |
| 163 | d = (*sp ? (*sp++)-'0' : 0); | |
| 164 | if(c<0 || c>9 || d<0 || d>9) | |
| 165 | return(-1); | |
| 166 | return(c+10*d); | |
| 167 | } |