diff options
Diffstat (limited to 'time/tst-mktime2.c')
| -rw-r--r-- | time/tst-mktime2.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/time/tst-mktime2.c b/time/tst-mktime2.c index bc7cc5818b..c41db3e3b7 100644 --- a/time/tst-mktime2.c +++ b/time/tst-mktime2.c @@ -5,8 +5,28 @@ #include <stdlib.h> #include <unistd.h> -static time_t time_t_max; -static time_t time_t_min; +/* True if the arithmetic type T is signed. */ +#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) + +/* The maximum and minimum values for the integer type T. These + macros have undefined behavior if T is signed and has padding bits. + If this is a problem for you, please let us know how to fix it for + your host. */ +#define TYPE_MINIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) 0 \ + : ~ TYPE_MAXIMUM (t))) +#define TYPE_MAXIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) -1 \ + : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1))) + +#ifndef TIME_T_MIN +# define TIME_T_MIN TYPE_MINIMUM (time_t) +#endif +#ifndef TIME_T_MAX +# define TIME_T_MAX TYPE_MAXIMUM (time_t) +#endif /* Values we'll use to set the TZ environment variable. */ static const char *tz_strings[] = @@ -53,8 +73,8 @@ static void mktime_test (time_t now) { mktime_test1 (now); - mktime_test1 ((time_t) (time_t_max - now)); - mktime_test1 ((time_t) (time_t_min + now)); + mktime_test1 ((time_t) (TIME_T_MAX - now)); + mktime_test1 ((time_t) (TIME_T_MIN + now)); } static void @@ -113,19 +133,13 @@ do_test (void) isn't worth using anyway. */ alarm (60); - for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2) - continue; - time_t_max--; - if ((time_t) -1 < 0) - for (time_t_min = -1; (time_t) (time_t_min * 2) < 0; time_t_min *= 2) - continue; - delta = time_t_max / 997; /* a suitable prime number */ + delta = TIME_T_MAX / 997; /* a suitable prime number */ for (i = 0; i < N_STRINGS; i++) { if (tz_strings[i]) setenv ("TZ", tz_strings[i], 1); - for (t = 0; t <= time_t_max - delta; t += delta) + for (t = 0; t <= TIME_T_MAX - delta; t += delta) mktime_test (t); mktime_test ((time_t) 1); mktime_test ((time_t) (60 * 60)); |