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restore proper difference calculation (bug #4746)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6166 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2005-07-19 23:28:12 +00:00
parent 4dd4428204
commit be8e1d2381
1 changed files with 7 additions and 1 deletions
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8
include/asterisk/time.h
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@@ -32,7 +32,13 @@ typedef typeof(tv.tv_usec) ast_suseconds_t;
AST_INLINE_API(
int ast_tvdiff_ms(struct timeval end, struct timeval start),
{
return ((end.tv_sec - start.tv_sec) * 1000) + ((end.tv_usec - start.tv_usec) / 1000);
/* the offset by 1,000,000 below is intentional...
it avoids differences in the way that division
is handled for positive and negative numbers, by ensuring
that the divisor is always positive
*/
return ((end.tv_sec - start.tv_sec) * 1000) +
(((1000000 + end.tv_usec - start.tv_usec) / 1000) - 1000);
}
)