/* -*-c-*-
*
- * $Id: tv.h,v 1.3 1999/05/06 19:51:36 mdw Exp $
+ * $Id: tv.h,v 1.7 2004/04/08 01:36:13 mdw Exp $
*
* Manipulation of timeval structures
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: tv.h,v $
- * Revision 1.3 1999/05/06 19:51:36 mdw
- * Reformatted the LGPL notice a little bit.
- *
- * Revision 1.2 1999/05/05 18:50:31 mdw
- * Change licensing conditions to LGPL.
- *
- * Revision 1.1 1998/11/25 23:30:01 mdw
- * New file.
- *
- */
-
-#ifndef TV_H
-#define TV_H
+#ifndef MLIB_TV_H
+#define MLIB_TV_H
#ifdef __cplusplus
extern "C" {
#include <sys/time.h>
+/*----- A macro to make reading easier ------------------------------------*/
+
+#define MILLION 1000000
+
/*----- Functions provided ------------------------------------------------*/
/* --- @tv_add@ --- *
const struct timeval */*a*/,
const struct timeval */*b*/);
+#define TV_ADD(dst, a, b) TV_ADDL(dst, a, (b)->tv_sec, (b)->tv_usec)
+
+/* --- @tv_addl@ --- *
+ *
+ * Arguments: @struct timeval *dst@ = destination block
+ * @const struct timeval *a@ = source blocks
+ * @time_t sec@, @unsigned long usec@ = time to add
+ *
+ * Returns: ---
+ *
+ * Use: Adds a literal time in seconds and microseconds.
+ */
+
+extern void tv_addl(struct timeval */*dst*/,
+ const struct timeval */*a*/,
+ time_t /*sec*/, unsigned long /*usec*/);
+
+#define TV_ADDL(dst, a, sec, usec) do { \
+ (dst)->tv_sec = (a)->tv_sec + (sec); \
+ (dst)->tv_usec = (a)->tv_usec + (usec); \
+ if ((dst)->tv_usec >= MILLION) { \
+ (dst)->tv_usec -= MILLION; \
+ (dst)->tv_sec++; \
+ } \
+} while (0)
+
/* --- @tv_sub@ --- *
*
* Arguments: @struct timeval *dst@ = destination block
const struct timeval */*a*/,
const struct timeval */*b*/);
+#define TV_SUB(dst, a, b) TV_SUBL(dst, a, (b)->tv_sec, (b)->tv_usec)
+
+/* --- @tv_subl@ --- *
+ *
+ * Arguments: @struct timeval *dst@ = destination block
+ * @const struct timeval *a@ = source blocks
+ * @time_t sec@, @unsigned long usec@ = time to subtract
+ *
+ * Returns: ---
+ *
+ * Use: Subtracts a literal time in seconds and microseconds.
+ */
+
+extern void tv_subl(struct timeval */*dst*/,
+ const struct timeval */*a*/,
+ time_t /*sec*/, unsigned long /*usec*/);
+
+#define TV_SUBL(dst, a, sec, usec) do { \
+ (dst)->tv_sec = (a)->tv_sec - (sec); \
+ if ((a)->tv_usec >= (usec)) \
+ (dst)->tv_usec = (a)->tv_usec - (usec); \
+ else { \
+ (dst)->tv_usec = (a)->tv_usec + MILLION - (usec); \
+ (dst)->tv_sec--; \
+ } \
+} while (0)
+
/* --- @tv_cmp@ --- *
*
* Arguments: @const struct timeval *a, *b@ = source blocks
extern int tv_cmp(const struct timeval */*a*/,
const struct timeval */*b*/);
+#define TV_CMP(a, op, b) ((a)->tv_sec == (b)->tv_sec ? \
+ (a)->tv_usec op (b)->tv_usec : \
+ (a)->tv_sec op (b)->tv_sec)
+
/*----- That's all, folks -------------------------------------------------*/
#ifdef __cplusplus