dmtxtime.c

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#include <errno.h>
 
#include "dmtx.h"
 
#define DMTX_USEC_PER_SEC 1000000
 
#if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
 
#    include <sys/time.h>
#    include <time.h>
#    define DMTX_TIME_PREC_USEC 1
 
extern DmtxTime dmtxTimeNow(void)
{
    DmtxPassFail err;
    struct timeval tv;
    DmtxTime tNow;
 
    err = gettimeofday(&tv, NULL);
    if (err != 0)
        ; /* XXX handle error better here */
 
    tNow.sec = tv.tv_sec;
    tNow.usec = tv.tv_usec;
 
    return tNow;
}
 
#elif defined(_MSC_VER)
 
#    include <Windows.h>
#    define DMTX_TIME_PREC_USEC 1
 
extern DmtxTime dmtxTimeNow(void)
{
    FILETIME ft;
    unsigned __int64 tm;
    DmtxTime tNow;
 
    GetSystemTimeAsFileTime(&ft);
 
    tm = ft.dwHighDateTime;
    tm <<= 32;
    tm |= ft.dwLowDateTime;
    tm /= 10;
 
    tNow.sec = tm / 1000000UL;
    tNow.usec = tm % 1000000UL;
 
    return tNow;
}
 
#else
 
#    include <time.h>
#    define DMTX_TIME_PREC_USEC 1000000
 
extern DmtxTime dmtxTimeNow(void)
{
    time_t s;
    DmtxTime tNow;
 
    s = time(NULL);
    if (errno != 0) {
        ; /* XXX handle error better here */
    }
 
    tNow.sec = s;
    tNow.usec = 0;
 
    return tNow;
}
 
#endif
 
extern DmtxTime dmtxTimeAdd(DmtxTime t, long msec)
{
    long usec;
 
    usec = msec * 1000;
 
    /* Ensure that time difference will register on local system */
    if (usec > 0 && usec < DMTX_TIME_PREC_USEC) {
        usec = DMTX_TIME_PREC_USEC;
    }
 
    /* Add time */
    t.sec += usec / DMTX_USEC_PER_SEC;
    t.usec += usec % DMTX_USEC_PER_SEC;
 
    /* Roll extra usecs into secs */
    while (t.usec >= DMTX_USEC_PER_SEC) {
        t.sec++;
        t.usec -= DMTX_USEC_PER_SEC;
    }
 
    return t;
}
 
extern int dmtxTimeExceeded(DmtxTime timeout)
{
    DmtxTime now;
 
    now = dmtxTimeNow();
 
    return (now.sec > timeout.sec || (now.sec == timeout.sec && now.usec > timeout.usec));
}
 
#undef DMTX_TIME_PREC_USEC
#undef DMTX_USEC_PER_SEC