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Filename : ADDTIME.C

/*
** ADDTIME.C - Add a time period to a base time, normalizing the result
**
** arguments: 1 - Base hours (0 -> 24)
** 2 - Base minutes (0 -> 59)
** 3 - Base seconds (0 -> 59)
** 4 - Span hours
** 5 - Span minutes
** 6 - Span seconds
** 7 - Address of returned hours (0 -> 23)
** 9 - Address of returned minutes (0 -> 59)
** 10 - Address of returned seconds (0 -> 59)
** 11 - Address of number of days to add to result
**
** returns: 0 if no error, non-zero if base time range error
**
** Notes: 1) Span values may be negative.
** 2) Overflowing midnight will cause a positive number of days to be
** returned.
** 3) Underflowing midnight will cause a negative number of days to be
** returned.
**
** Original Copyright 1994 by Bob Stout as part of
** the MicroFirm Function Library (MFL)
**
** This subset version is donated to the public domain.
*/

#include

int add_time(unsigned basehrs, unsigned basemins, unsigned basesecs,
int spanhrs, int spanmins, int spansecs,
unsigned *hrs, unsigned *mins, unsigned *secs, int *days)
{
int h, m, s;
div_t r;

if (basehrs > 24 || basemins > 59 || basesecs > 59)
return -1;

if (24 == basehrs)
basehrs = 0;
h = (int)basehrs + spanhrs;
m = (int)basemins + spanmins;
s = (int)basesecs + spansecs;

r = div(s, 60);
if (s < 0)
{
r.rem += 60;
--r.quot;
}
*secs = r.rem;
m += r.quot;

r = div(m, 60);
if (m < 0)
{
r.rem += 60;
--r.quot;
}
*mins = r.rem;
h += r.quot;

r = div(h, 24);
if (h < 0)
{
r.rem += 24;
--r.quot;
}
*hrs = r.rem;
*days = r.quot;

return 0;
}

#ifdef TEST

#include

main(int argc, char *argv[])
{
unsigned bh, bm, bs, h, m, s;
int sh, sm, ss, days;

if (7 > argc)
{
puts("Usage: ADDTIME base_hrs base_mins base_secs "
"span_hrs span_mins span_secs");
return EXIT_FAILURE;
}

bh = (unsigned)atoi(argv[1]);
bm = (unsigned)atoi(argv[2]);
bs = (unsigned)atoi(argv[3]);
sh = atoi(argv[4]);
sm = atoi(argv[5]);
ss = atoi(argv[6]);

printf("add_time() returned %d\n",
add_time(bh, bm, bs, sh, sm, ss, &h, &m, &s, &days));

printf("%2d:%02d:%02d + %2d:%02d:%02d = %2d:%02d:%02d + %d days\n",
bh, bm, bs, sh, sm, ss, h, m, s, days);
}

#endif