* arith.c (bignum): Previously static function now exposed as external.

* arith.h (bignum): Declared.

* configure: Added check for tm_gmtoff and tm_tmzone fields
being present in struct tm.

* eval.c (eval_init): New intrinsic functions: time, time-usec.

* lib.c (num): If the cnum is outside of the fixnum range, then
construct a bignum.
(time_sec, time_sec_usec): New functions.

* lib.h (mut): Slight change to macro to eliminate compiler warning.
(time_sec, time_sec_usec): Declared.

* txr.1: Stub section for time and time-usec.

* txr.vim: Highlighting for time and time-usec.

1 files changed, 37 insertions, 0 deletions

diff --git a/configure b/configure
index 46667045..b91551b2 100755
--- a/configure
+++ b/configure
@@ -1109,6 +1109,43 @@ done
 printf "done\n"
 
 #
+# Check for fields inside struct tm
+#
+
+printf "Printf detecting timezone fields in struct tm ..."
+
+tm_gmtoff=
+tm_tmzone=
+
+for try_field in tm_gmtoff __tm_gmtoff ; do
+  cat > conftest.c <<!
+#include <time.h>
+int x = sizeof ((struct tm *) 0)->$try_field;
+!
+  rm -f conftest.o
+  if make conftest.o > conftest.err 2>&1 ; then
+    printf "#define HAVE_TM_GMTOFF 1\n" >> config.h
+    printf "#define TM_GMTOFF %s\n" $try_field >> config.h
+    break
+  fi
+done
+
+for try_field in tm_zone __tm_zone ; do
+  cat > conftest.c <<!
+#include <time.h>
+int x = sizeof ((struct tm *) 0)->$try_field;
+!
+  rm -f conftest.o
+  if make conftest.o > conftest.err 2>&1 ; then
+    printf "#define HAVE_TM_ZONE 1\n" >> config.h
+    printf "#define TM_ZONE %s\n" $try_field >> config.h
+    break
+  fi
+done
+
+printf "done\n"
+
+#
 # Extra debugging.
 #