X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/189e98302534f1bf59c7ed0b29ba6dd025b45fc1..21237d054e4b9d6091decded21898b22dfb4f92c:/lib/timeval.h

diff --git a/lib/timeval.h b/lib/timeval.h
index 9ec8c31..fe2906c 100644
--- a/lib/timeval.h
+++ b/lib/timeval.h
@@ -1,26 +1,29 @@
 /*
  * This file is part of DisOrder.
- * Copyright (C) 2007 Richard Kettlewell
+ * Copyright (C) 2007-2009 Richard Kettlewell
  *
- * This program is free software; you can redistribute it and/or modify
+ * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/** @file lib/timeval.h
+ * @brief Arithmetic on timeval structures
  */
-
 #ifndef TIMEVAL_H
 #define TIMEVAL_H
 
+#include <time.h>
+#include <sys/time.h>
+
 static inline struct timeval tvsub(const struct timeval a,
                                    const struct timeval b) {
   struct timeval r;
@@ -38,12 +41,64 @@ static inline struct timeval tvsub(const struct timeval a,
   return r;
 }
 
+static inline struct timeval tvadd(const struct timeval a,
+                                   const struct timeval b) {
+  struct timeval r;
+
+  r.tv_sec = a.tv_sec + b.tv_sec;
+  r.tv_usec = a.tv_usec + b.tv_usec;
+  if(r.tv_usec < 0) {
+    r.tv_usec += 1000000;
+    r.tv_sec--;
+  }
+  if(r.tv_usec > 999999) {
+    r.tv_usec -= 1000000;
+    r.tv_sec++;
+  }
+  return r;
+}
+
+static inline double tvdouble(const struct timeval a) {
+  return a.tv_sec + a.tv_usec / 1000000.0;
+}
+
 static inline int64_t tvsub_us(const struct timeval a,
                                const struct timeval b) {
   return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec)
           - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec));
 }
 
+/** @brief Great-than comparison for timevals */
+static inline int tvgt(const struct timeval *a, const struct timeval *b) {
+  if(a->tv_sec > b->tv_sec)
+    return 1;
+  if(a->tv_sec == b->tv_sec
+     && a->tv_usec > b->tv_usec)
+    return 1;
+  return 0;
+}
+
+/** @brief Less-than
+    comparison for timevals */
+static inline int tvlt(const struct timeval *a, const struct timeval *b) {
+  if(a->tv_sec < b->tv_sec)
+    return 1;
+  if(a->tv_sec == b->tv_sec
+     && a->tv_usec < b->tv_usec)
+    return 1;
+  return 0;
+}
+
+/** @brief Greater-than-or-equal comparison for timevals */
+static inline int tvge(const struct timeval *a, const struct timeval *b) {
+  return !tvlt(a, b);
+}
+
+/** @brief Less-than-or-equal comparison for timevals */
+static inline int tvle(const struct timeval *a, const struct timeval *b) {
+  return !tvgt(a, b);
+}
+
 #endif /* TIMEVAL_H */
 
 /*