// Compare the received checksum, and the calculated checksum.
//If they are completely equal, return true. Otherwise return false.
boolean dGPS::Compare(){
char s[3];
char *recCheck=Checks(); // received checksum
long int x= Checked(); // Computed checksum from the incoming $GPRMC string
char *ccomCheck=itoa(x,s,16); // convert long int to hexadecimal string
char comCheck[strlen(ccomCheck)];
for (int i=0;i<=strlen(ccomCheck);i++){ // convert ToUpper case, each character of hexadecimal string
comCheck[i]= toupper(ccomCheck[i]);}
boolean flag;
// for each character in hexadecimal string, check if it matches with the received checksum value
for (int i=0;i<min(strlen(recCheck),strlen(comCheck));i++){
if (recCheck[i]==comCheck[i])
{ flag=true; } // if characters in checksum match
else { flag=false; } // if characters in checksum do not match
}
return flag; // if all the characters in checksum match, then 'true' is returned. Otherwise, 'false' is returned.
}
/*---------------------------------------------------------------------
ConstructHull adds the vertices to the hull one at a time. The hull
vertices are those in the list marked as onhull.
---------------------------------------------------------------------*/
void ConstructHull( void )
{
tVertex v, vnext;
v = vertices;
do {
vnext = v->next;
if ( !v->mark ) {
v->mark = PROCESSED;
AddOne( v );
CleanUp( &vnext ); /* Pass down vnext in case it gets deleted. */
if ( check ) {
fprintf(stderr,"ConstructHull: After Add of %d & Cleanup:\n",
v->vnum);
Checks();
}
if ( debug )
PrintOut( v );
}
v = vnext;
} while ( v != vertices );
}
