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Avoid integer overflow in MonotonicClock{S,MS,US} 

This is Darwin specific: the previous implementation was causing an integer
overflow when base.numer is very large. On PPC Darwin, the timebase info is 1000000000/33330116 and this is too large for integer arithmetic.
This commit is contained in:
PHO 2015-01-26 14:54:16 +09:00 committed by Max Kellermann
parent 7bf638b0de
commit 39abd3ecb4
2 changed files with 7 additions and 6 deletions
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1
NEWS
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@ -1,6 +1,7 @@
ver 0.19.9 (not yet released)
* decoder
- dsdiff, dsf: raise ID3 tag limit to 1 MB
* fix clock integer overflow on OS X
* fix build failure with uClibc
* fix build failure on non-POSIX operating systems

12
src/system/Clock.cxx
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@ -40,8 +40,8 @@ MonotonicClockS(void)
if (base.denom == 0)
(void)mach_timebase_info(&base);
return (unsigned)((mach_absolute_time() * base.numer / 1000)
/ (1000000 * base.denom));
return (unsigned)(((double)mach_absolute_time() * base.numer / 1000)
/ base.denom / 1000000);
#elif defined(CLOCK_MONOTONIC)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
@ -62,8 +62,8 @@ MonotonicClockMS(void)
if (base.denom == 0)
(void)mach_timebase_info(&base);
return (unsigned)((mach_absolute_time() * base.numer)
/ (1000000 * base.denom));
return (unsigned)(((double)mach_absolute_time() * base.numer)
/ base.denom / 1000000);
#elif defined(CLOCK_MONOTONIC)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
@ -104,8 +104,8 @@ MonotonicClockUS(void)
if (base.denom == 0)
(void)mach_timebase_info(&base);
return ((uint64_t)mach_absolute_time() * (uint64_t)base.numer)
/ (1000 * (uint64_t)base.denom);
return (uint64_t)(((double)mach_absolute_time() * base.numer)
/ base.denom / 1000);
#elif defined(CLOCK_MONOTONIC)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);