(ptrace) [PTRACE_TRACEME]: Notify the proc server that we are now traced.
[glibc.git] / time / offtime.c
blob4b8ddb170b5e50bd1627695342ff562022b776fc
1 /* Copyright (C) 1991, 1993 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
19 #include <ansidecl.h>
20 #include <time.h>
23 /* Defined in mktime.c. */
24 extern CONST unsigned short int __mon_yday[2][13];
26 #define SECS_PER_HOUR (60 * 60)
27 #define SECS_PER_DAY (SECS_PER_HOUR * 24)
29 /* Compute the `struct tm' representation of *T,
30 offset OFFSET seconds east of UTC,
31 and store year, yday, mon, mday, wday, hour, min, sec into *TP. */
32 void
33 DEFUN(__offtime, (t, offset, tp),
34 CONST time_t *t AND long int offset AND struct tm *tp)
36 register long int days, rem;
37 register int y;
38 register CONST unsigned short int *ip;
40 days = *t / SECS_PER_DAY;
41 rem = *t % SECS_PER_DAY;
42 rem += offset;
43 while (rem < 0)
45 rem += SECS_PER_DAY;
46 --days;
48 while (rem >= SECS_PER_DAY)
50 rem -= SECS_PER_DAY;
51 ++days;
53 tp->tm_hour = rem / SECS_PER_HOUR;
54 rem %= SECS_PER_HOUR;
55 tp->tm_min = rem / 60;
56 tp->tm_sec = rem % 60;
57 /* January 1, 1970 was a Thursday. */
58 tp->tm_wday = (4 + days) % 7;
59 if (tp->tm_wday < 0)
60 tp->tm_wday += 7;
61 y = 1970;
62 while (days >= (rem = __isleap(y) ? 366 : 365))
64 ++y;
65 days -= rem;
67 while (days < 0)
69 --y;
70 days += __isleap(y) ? 366 : 365;
72 tp->tm_year = y - 1900;
73 tp->tm_yday = days;
74 ip = __mon_yday[__isleap(y)];
75 for (y = 11; days < ip[y]; --y)
76 continue;
77 days -= ip[y];
78 tp->tm_mon = y;
79 tp->tm_mday = days + 1;