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authorUlrich Drepper <drepper@redhat.com>1998-01-24 02:44:44 +0000
committerUlrich Drepper <drepper@redhat.com>1998-01-24 02:44:44 +0000
commit1dfee75f84b1c2b78e0cdafe79e5269b857d527f (patch)
treecb623a6cee7221b561823ebc98732c817300991a /time/mktime.c
parent699171a27f45352f64d0984b994d93fdb81ed107 (diff)
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Update
* lib/mktime.c (__mktime_internal): Work around bug in Irix4.0.5's C compiler. From Kaveh Ghazi. (TYPE_MINIMUM): Define. (TYPE_MAXIMUM): Define. (TIME_T_MIN): Use TYPE_MINIMUM. (TIME_T_MAX): Use TYPE_MAXIMUM. Patch by Jim Meyering <meyering@ascend.com>.
Diffstat (limited to 'time/mktime.c')
-rw-r--r--time/mktime.c33
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;
}