switch to avr-libc 1.8.1 time library

[z180-stamp.git] / time / time.c

diff --git a/time/time.c b/time/time.c
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--- /dev/null
+++ b/time/time.c
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+/*
+ * (c)2012 Michael Duane Rice All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer. Redistributions in binary
+ * form must reproduce the above copyright notice, this list of conditions
+ * and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution. Neither the name of the copyright holders
+ * nor the names of contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* $Id: time.c 2318 2013-03-30 11:59:28Z swfltek $ */
+
+/*
+       Standard time() function. Copying from __system_time must be atomic, since it
+       may be incremented at interrupt time.
+*/
+#include <time.h>
+#include <inttypes.h>
+
+extern volatile time_t __system_time;
+
+time_t
+time(time_t * timer)
+{
+       time_t          ret;
+
+       asm             volatile(
+                                          "in __tmp_reg__, __SREG__" "\n\t"
+                                                "cli" "\n\t"
+                                ::
+       );
+       ret = __system_time;
+       asm             volatile(
+                                         "out __SREG__, __tmp_reg__" "\n\t"
+                                ::
+       );
+       if (timer)
+               *timer = ret;
+       return ret;
+}