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timeval: make pa_timeval_sub saturating

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This commit is contained in:
Lennart Poettering 2009-09-18 04:10:26 +02:00 • committed by Colin Guthrie
parent fd1f9f8571
commit 13112f6a76
1 changed files with 38 additions and 12 deletions
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50
src/pulse/timeval.c
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@ -33,6 +33,7 @@
#include <pulsecore/winsock.h>
#include <pulsecore/macro.h>
#include <pulsecore/core-util.h>
#include "timeval.h"
@ -54,9 +55,9 @@ struct timeval *pa_gettimeofday(struct timeval *tv) {
#define EPOCHFILETIME (116444736000000000LL)
#endif
FILETIME ft;
LARGE_INTEGER li;
__int64 t;
FILETIME ft;
LARGE_INTEGER li;
int64_t t;
pa_assert(tv);
@ -128,40 +129,65 @@ pa_usec_t pa_timeval_age(const struct timeval *tv) {
}
struct timeval* pa_timeval_add(struct timeval *tv, pa_usec_t v) {
unsigned long secs;
time_t secs;
pa_assert(tv);
secs = (unsigned long) (v/PA_USEC_PER_SEC);
tv->tv_sec += (time_t) secs;
v -= ((pa_usec_t) secs) * PA_USEC_PER_SEC;
secs = (time_t) (v/PA_USEC_PER_SEC);
if (PA_UNLIKELY(tv->tv_sec > PA_INT_TYPE_MAX(time_t) - secs))
goto overflow;
tv->tv_sec += secs;
v -= (pa_usec_t) secs * PA_USEC_PER_SEC;
tv->tv_usec += (suseconds_t) v;
/* Normalize */
while ((unsigned) tv->tv_usec >= PA_USEC_PER_SEC) {
while ((pa_usec_t) tv->tv_usec >= PA_USEC_PER_SEC) {
if (PA_UNLIKELY(tv->tv_sec >= PA_INT_TYPE_MAX(time_t)))
goto overflow;
tv->tv_sec++;
tv->tv_usec -= (suseconds_t) PA_USEC_PER_SEC;
}
return tv;
overflow:
tv->tv_sec = PA_INT_TYPE_MAX(time_t);
tv->tv_usec = (suseconds_t) (PA_USEC_PER_SEC-1);
return tv;
}
struct timeval* pa_timeval_sub(struct timeval *tv, pa_usec_t v) {
unsigned long secs;
time_t secs;
pa_assert(tv);
secs = (unsigned long) (v/PA_USEC_PER_SEC);
tv->tv_sec -= (time_t) secs;
v -= ((pa_usec_t) secs) * PA_USEC_PER_SEC;
secs = (time_t) (v/PA_USEC_PER_SEC);
if (PA_UNLIKELY(tv->tv_sec < secs))
goto underflow;
tv->tv_sec -= secs;
v -= (pa_usec_t) secs * PA_USEC_PER_SEC;
if (tv->tv_usec >= (suseconds_t) v)
tv->tv_usec -= (suseconds_t) v;
else {
if (PA_UNLIKELY(tv->tv_sec <= 0))
goto underflow;
tv->tv_sec --;
tv->tv_usec += (suseconds_t) (PA_USEC_PER_SEC - v);
}
return tv;
underflow:
tv->tv_sec = 0;
tv->tv_usec = 0;
return tv;
}
struct timeval* pa_timeval_store(struct timeval *tv, pa_usec_t v) {