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Add cycle function to handle Elizabeth's school schedule.

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This commit is contained in:
David F. Skoll
2007-08-21 17:10:04 -04:00
parent a361c7e426
commit 176037082b
1 changed files with 41 additions and 0 deletions
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41
src/funcs.c
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@@ -51,6 +51,7 @@
/* Function prototypes */
static int FCurrent (void);
static int FCycle (void);
static int FTimepart(void);
static int FDatepart(void);
static int FRealCurrent(void);
@@ -191,6 +192,7 @@ Operator Func[] = {
{ "choose", 2, NO_MAX, FChoose },
{ "coerce", 2, 2, FCoerce },
{ "current", 0, 0, FCurrent },
{ "cycle", 3, NO_MAX, FCycle },
{ "date", 3, 3, FDate },
{ "datepart", 1, 1, FDatepart },
{ "datetime", 2, 5, FDateTime },
@@ -2438,3 +2440,42 @@ static int FTzconvert(void)
RetVal.v.val = jul * MINUTES_PER_DAY + tim;
return OK;
}
static int
FCycle(void)
{
int d1, d2, modulus, ans, localomit, i;
Token tok;
if (!HASDATE(ARG(0)) ||
!HASDATE(ARG(1)) ||
ARG(2).type != INT_TYPE) {
return E_BAD_TYPE;
}
modulus = ARG(2).v.val;
if (modulus < 1) return E_2LOW;
d1 = DATEPART(ARG(0));
d2 = DATEPART(ARG(1));
if (d2 < d1) return E_2LOW;
localomit = 0;
for (i=3; i<Nargs; i++) {
if (ARG(i).type != STR_TYPE) return E_BAD_TYPE;
FindToken(ARG(i).v.str, &tok);
if (tok.type != T_WkDay) return E_BAD_TYPE;
localomit |= (1 << tok.val);
}
ans = 0;
while (d1 < d2) {
if (!IsOmitted(d1, localomit)) {
ans++;
if (ans >= modulus) ans = 0;
}
d1++;
}
RetVal.type = INT_TYPE;
RetVal.v.val = ans;
return OK;
}