?RCS: You may distribute under the terms of either the GNU General Public
?RCS: License or the Artistic License, as specified in the README file.
?RCS:
-?MAKE:sGMTIME_max sGMTIME_min: cat rm_try Setvar Compile run
+?MAKE:sGMTIME_max sGMTIME_min: cat rm_try Setvar Compile run i_values
?MAKE: -pick add $@ %<
?S:sGMTIME_max:
?S: This variable defines the maximum value of the time_t offset that
?D:sGMTIME_max=0
?D:sGMTIME_min=0
?F:!try
+?T:yyy
: Check the max offset that gmtime accepts
-echo "Checking max offset that gmtime () accepts"
+echo "Checking max offsets that gmtime () accepts"
-$cat >try.c <<'EOCP'
+case $i_values in
+ define) yyy="#include <values.h>" ;;
+ *) yyy="" ;;
+ esac
+
+$cat >try.c <<EOCP
#include <sys/types.h>
#include <stdio.h>
#include <time.h>
-int main () {
- struct tm *tmp;
- int i, y = 0;
- time_t pt = 0;
+$yyy
+
+int i;
+struct tm *tmp;
+time_t pt;
- for (i = 0; i < 78; i++) {
- time_t t = ((time_t)1 << i) - 1;
+void gm_check (time_t t)
+{
tmp = gmtime (&t);
- if (tmp == NULL || tmp->tm_year < y) {
- i--;
- printf ("%ld\n", pt);
- return (i);
- }
+ if (tmp == NULL || tmp->tm_year < -1900)
+ tmp = NULL;
+ else
+ pt = t;
+ } /* gm_check */
- y = tmp->tm_year;
- pt = t;
+int check_max ()
+{
+ tmp = NULL;
+ pt = 0;
+#ifdef MAXLONG
+ gm_check (MAXLONG);
+#endif
+ if (tmp == NULL || tmp->tm_year < 0) {
+ for (i = 63; i >= 0; i--) {
+ time_t x = pt | ((time_t)1 << i);
+ if (x < 0) continue;
+ gm_check (x);
+ }
}
- printf ("%ld\n", pt);
+ printf ("sGMTIME_max=%ld\n", pt);
return (0);
}
-EOCP
-set try
-if eval $compile; then
- sGMTIME_max=`$run ./try`
-else
- echo "Cannot determine sGMTIME_max"
- fi
-$rm_try
-echo "Checking min offset that gmtime () accepts"
-
-$cat >try.c <<'EOCP'
-#include <sys/types.h>
-#include <stdio.h>
-#include <time.h>
-int main () {
- struct tm *tmp;
- int i, y = 70;
- time_t pt = 0;
-
- for (i = 0; i < 78; i++) {
- time_t t = - ((time_t)1 << i);
- tmp = gmtime (&t);
- if (tmp == NULL || tmp->tm_year > y) {
- i--;
- printf ("%ld\n", pt);
- return (i);
+int check_min ()
+{
+ tmp = NULL;
+ pt = 0;
+#ifdef MINLONG
+ gm_check (MINLONG);
+#endif
+ if (tmp == NULL) {
+ for (i = 36; i >= 0; i--) {
+ time_t x = pt - ((time_t)1 << i);
+ if (x > 0) continue;
+ gm_check (x);
}
-
- y = tmp->tm_year;
- pt = t;
}
- printf ("%ld\n", pt);
+ printf ("sGMTIME_min=%ld\n", pt);
return (0);
}
+
+int main (int argc, char *argv[])
+{
+ fprintf (stderr, "Sizeof time_t = %ld\n", sizeof (time_t));
+ check_max ();
+ check_min ();
+ return (0);
+ } /* main */
EOCP
set try
if eval $compile; then
- sGMTIME_min=`$run ./try`
+ yyy=`$run ./try`
+ eval $yyy
else
- echo "Cannot determine sGMTIME_min"
+ echo "Cannot determine sGMTIME_max and sGMTIME_min." >&4
fi
$rm_try