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r12761: get the TIME_T_MIN and TIME_T_MAX right again, merging from samba3 was a bad idea...

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as in samba4 we use TIME_T_MIN = 0 (maybe we should do this in samba3 too) because
negativ values mean error.

but still restrict TIME_T_MAX to INT32_MAX, to not overflow gmtime() on 64 bit systems,
is this behavior documented somewhere?

metze
This commit is contained in:
Stefan Metzmacher 2006-01-08 00:09:49 +00:00 committed by Gerald (Jerry) Carter
parent 523746f271
commit 333b1b8c48
1 changed files with 16 additions and 4 deletions
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20
source/lib/time.c
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@ -27,14 +27,26 @@
#define CHAR_BIT 8
#endif
/* The extra casts work around common compiler bugs. */
#define _TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
It is necessary at least when t == time_t. */
#define _TYPE_MINIMUM(t) ((t) (_TYPE_SIGNED (t) \
? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
#define _TYPE_MAXIMUM(t) ((t) (~ (t) 0 - _TYPE_MINIMUM (t)))
#ifndef TIME_T_MIN
#define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \
: ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
/* we use 0 here, because (time_t)-1 means error */
#define TIME_T_MIN 0
#endif
#ifndef TIME_T_MAX
#define TIME_T_MAX MIN(INT32_MAX,(~ (time_t) 0 - TIME_T_MIN))
/*
* we use the INT32_MAX here as on 64 bit systems,
* gmtime() fails with INT64_MAX
*/
#define TIME_T_MAX MIN(INT32_MAX,_TYPE_MAXIMUM(time_t))
#endif
/*******************************************************************
External access to time_t_min and time_t_max.
********************************************************************/