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1.1 root 1: /*
2: * Copyright (c) 1983 Eric P. Allman
3: * Copyright (c) 1988 Regents of the University of California.
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms are permitted provided
7: * that: (1) source distributions retain this entire copyright notice and
8: * comment, and (2) distributions including binaries display the following
9: * acknowledgement: ``This product includes software developed by the
10: * University of California, Berkeley and its contributors'' in the
11: * documentation or other materials provided with the distribution and in
12: * all advertising materials mentioning features or use of this software.
13: * Neither the name of the University nor the names of its contributors may
14: * be used to endorse or promote products derived from this software without
15: * specific prior written permission.
16: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19: */
20:
21: #ifndef lint
22: static char sccsid[] = "@(#)arpadate.c 5.11 (Berkeley) 6/1/90";
23: #endif /* not lint */
24:
25: # include "conf.h"
26: # include <time.h>
27: # include <sys/types.h>
28: # include "useful.h"
29:
30: /*
31: ** ARPADATE -- Create date in ARPANET format
32: **
33: ** Parameters:
34: ** ud -- unix style date string. if NULL, one is created.
35: **
36: ** Returns:
37: ** pointer to an ARPANET date field
38: **
39: ** Side Effects:
40: ** none
41: **
42: ** WARNING:
43: ** date is stored in a local buffer -- subsequent
44: ** calls will overwrite.
45: **
46: ** Bugs:
47: ** Timezone is computed from local time, rather than
48: ** from whereever (and whenever) the message was sent.
49: ** To do better is very hard.
50: **
51: ** Some sites are now inserting the timezone into the
52: ** local date. This routine should figure out what
53: ** the format is and work appropriately.
54: */
55:
56: char *
57: arpadate(ud)
58: register char *ud;
59: {
60: register char *p;
61: register char *q;
62: register int off;
63: register int i;
64: register struct tm *lt;
65: time_t t;
66: struct tm gmt;
67: static char b[40];
68: extern struct tm *localtime(), *gmtime();
69: extern char *ctime();
70: extern time_t time();
71:
72: /*
73: ** Get current time.
74: ** This will be used if a null argument is passed and
75: ** to resolve the timezone.
76: */
77:
78: (void) time(&t);
79: if (ud == NULL)
80: ud = ctime(&t);
81:
82: /*
83: ** Crack the UNIX date line in a singularly unoriginal way.
84: */
85:
86: q = b;
87:
88: p = &ud[0]; /* Mon */
89: *q++ = *p++;
90: *q++ = *p++;
91: *q++ = *p++;
92: *q++ = ',';
93: *q++ = ' ';
94:
95: p = &ud[8]; /* 16 */
96: if (*p == ' ')
97: p++;
98: else
99: *q++ = *p++;
100: *q++ = *p++;
101: *q++ = ' ';
102:
103: p = &ud[4]; /* Sep */
104: *q++ = *p++;
105: *q++ = *p++;
106: *q++ = *p++;
107: *q++ = ' ';
108:
109: p = &ud[22]; /* 79 */
110: *q++ = *p++;
111: *q++ = *p++;
112: *q++ = ' ';
113:
114: p = &ud[11]; /* 01:03:52 */
115: for (i = 8; i > 0; i--)
116: *q++ = *p++;
117:
118: /*
119: * should really get the timezone from the time in "ud" (which
120: * is only different if a non-null arg was passed which is different
121: * from the current time), but for all practical purposes, returning
122: * the current local zone will do (its all that is ever needed).
123: */
124: gmt = *gmtime(&t);
125: lt = localtime(&t);
126:
127: off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
128:
129: /* assume that offset isn't more than a day ... */
130: if (lt->tm_year < gmt.tm_year)
131: off -= 24 * 60;
132: else if (lt->tm_year > gmt.tm_year)
133: off += 24 * 60;
134: else if (lt->tm_yday < gmt.tm_yday)
135: off -= 24 * 60;
136: else if (lt->tm_yday > gmt.tm_yday)
137: off += 24 * 60;
138:
139: *q++ = ' ';
140: if (off == 0) {
141: *q++ = 'G';
142: *q++ = 'M';
143: *q++ = 'T';
144: } else {
145: if (off < 0) {
146: off = -off;
147: *q++ = '-';
148: } else
149: *q++ = '+';
150:
151: if (off >= 24*60) /* should be impossible */
152: off = 23*60+59; /* if not, insert silly value */
153:
154: *q++ = (off / 600) + '0';
155: *q++ = (off / 60) % 10 + '0';
156: off %= 60;
157: *q++ = (off / 10) + '0';
158: *q++ = (off % 10) + '0';
159: }
160: *q = '\0';
161:
162: return (b);
163: }
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