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| author | Stefan Metzmacher <metze@samba.org> | 2006-01-08 00:09:49 +0000 |
|---|---|---|
| committer | Gerald (Jerry) Carter <jerry@samba.org> | 2007-10-10 13:49:51 -0500 |
| commit | 74eb3f2af140700515f7bafd2aaea98307b80471 (patch) | |
| tree | ae689c921b3785ab6cd9bbb1de277adc08b53534 /source4/lib/time.c | |
| parent | da8151ae9f42b86868fa2ad3fc3825f2285a2fb4 (diff) | |
| download | samba-74eb3f2af140700515f7bafd2aaea98307b80471.tar.gz samba-74eb3f2af140700515f7bafd2aaea98307b80471.tar.bz2 samba-74eb3f2af140700515f7bafd2aaea98307b80471.zip | |
r12761: get the TIME_T_MIN and TIME_T_MAX right again, merging from samba3 was a bad idea...
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 used to be commit 333b1b8c4885c47a0d14d83896fce6740fa4d663)
Diffstat (limited to 'source4/lib/time.c')
| -rw-r--r-- | source4/lib/time.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/source4/lib/time.c b/source4/lib/time.c index 65e9fc85cb..eb42d2963e 100644 --- a/source4/lib/time.c +++ b/source4/lib/time.c @@ -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. ********************************************************************/ |