_CP_dcount is equivalent to the result = dcount(string1, string2) BASIC statement.
int _CP_dcount(int* result, CPSTR* string1, CPSTR* string2)
This function returns -1 if an error occurs. The error code is contained in _CP_errno.
/* Prints "3". */
CPSTR * s = _CP_mkstr("bbc");
CPSTR * t = _CP_mkstr("b");
int i;
_CP_dcount(&i,s,t);
_CP_unix_env();
printf("%d\n", i);