Commit | Line | Data |
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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 | } |