sys/time.h additions

[Joel Sherrill]

We are close to the point where I am going to have to submit a
lump. :)

But for now, this simply adds macros such as "timerisset, timerclear,
timercmp, timeradd, etc. from BSD for RTEMS specific targets.

2000-12-01      Joel Sherrill <joel@OARcorp.com>

        * libc/include/sys/time.h: Added BSD timer manipulation macros
        used by RTEMS code.  These are currently within an RTEMS
conditional.

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel@OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
   Support Available             (256) 722-9985
Index: newlib/libc/include/sys/time.h
===================================================================
RCS file: /cvs/src/src/newlib/libc/include/sys/time.h,v
retrieving revision 1.2
diff -u -r1.2 time.h
--- time.h	2000/05/30 17:18:05	1.2
+++ time.h	2000/12/01 13:20:17
@@ -38,6 +38,38 @@
   struct  timeval it_value;
 };
 
+/* BSD time macros used by RTEMS code */
+#if defined(__rtems__)
+
+/* Convenience macros for operations on timevals.
+   NOTE: `timercmp' does not work for >= or <=.  */
+#define	timerisset(tvp)		((tvp)->tv_sec || (tvp)->tv_usec)
+#define	timerclear(tvp)		((tvp)->tv_sec = (tvp)->tv_usec = 0)
+#define	timercmp(a, b, CMP) 						      \
+  (((a)->tv_sec == (b)->tv_sec) ? 					      \
+   ((a)->tv_usec CMP (b)->tv_usec) : 					      \
+   ((a)->tv_sec CMP (b)->tv_sec))
+#define	timeradd(a, b, result)						      \
+  do {									      \
+    (result)->tv_sec = (a)->tv_sec + (b)->tv_sec;			      \
+    (result)->tv_usec = (a)->tv_usec + (b)->tv_usec;			      \
+    if ((result)->tv_usec >= 1000000)					      \
+      {									      \
+	++(result)->tv_sec;						      \
+	(result)->tv_usec -= 1000000;					      \
+      }									      \
+  } while (0)
+#define	timersub(a, b, result)						      \
+  do {									      \
+    (result)->tv_sec = (a)->tv_sec - (b)->tv_sec;			      \
+    (result)->tv_usec = (a)->tv_usec - (b)->tv_usec;			      \
+    if ((result)->tv_usec < 0) {					      \
+      --(result)->tv_sec;						      \
+      (result)->tv_usec += 1000000;					      \
+    }									      \
+  } while (0)
+#endif
+
 int _EXFUN(gettimeofday, (struct timeval *__p, struct timezone *__z));
 int _EXFUN(settimeofday, (const struct timeval *, const struct timezone *));
 int _EXFUN(utimes, (const char *__path, struct timeval *__tvp));