diff options
Diffstat (limited to 'time')
| -rw-r--r-- | time/mktime.c | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/time/mktime.c b/time/mktime.c index fcb3cc8f95..653ef5c25e 100644 --- a/time/mktime.c +++ b/time/mktime.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. +/* Copyright (C) 1993, 94, 95, 96, 97, 98 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Paul Eggert (eggert@twinsun.com). @@ -25,7 +25,7 @@ # include <config.h> #endif -/* Some hosts need this in order to declare localtime_r properly. */ +/* Some systems need this in order to declare localtime_r properly. */ #ifndef _REENTRANT # define _REENTRANT 1 #endif @@ -71,21 +71,26 @@ # 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) 0 - TYPE_MINIMUM (t)) + #ifndef INT_MIN -# define INT_MIN (~0 << (sizeof (int) * CHAR_BIT - 1)) +# define INT_MIN TYPE_MINIMUM (int) #endif #ifndef INT_MAX -# define INT_MAX (~0 - INT_MIN) +# define INT_MAX TYPE_MAXIMUM (int) #endif #ifndef TIME_T_MIN -/* The outer cast to time_t works around a bug in Cray C 5.0.3.0. */ -# define TIME_T_MIN ((time_t) \ - (0 < (time_t) -1 ? (time_t) 0 \ - : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))) +# define TIME_T_MIN TYPE_MINIMUM (time_t) #endif #ifndef TIME_T_MAX -# define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN) +# define TIME_T_MAX TYPE_MAXIMUM (time_t) #endif #define TM_YEAR_BASE 1900 @@ -363,7 +368,15 @@ __mktime_internal (tp, convert, offset) double dday = 366 * dyear + mday; double dsec = 60 * (60 * (24 * dday + hour) + min) + sec_requested; - if (TIME_T_MAX / 3 - TIME_T_MIN / 3 < (dsec < 0 ? - dsec : dsec)) + /* On Irix4.0.5 cc, dividing TIME_T_MIN by 3 does not produce + correct results, ie., it erroneously gives a positive value + of 715827882. Setting a variable first then doing math on it + seems to work. (ghazi@caip.rutgers.edu) */ + + const time_t time_t_max = TIME_T_MAX; + const time_t time_t_min = TIME_T_MIN; + + if (time_t_max / 3 - time_t_min / 3 < (dsec < 0 ? - dsec : dsec)) return -1; } |