C / C++ / MFC

#ifndef BYTE	// For OS X -ers
	#define unsigned char BYTE
	#define unsigned char * LPBYTE
#endif
#include <vector>
#include <algorithm>
void separate(vector< pair<LPBYTE, LPBYTE> >& retVec, LPBYTE data, LPBYTE delimeter, /* out */bool *bComplete = 0) {
	retVec.clear();
	if (bComplete) *bComplete = false;

	if (!data)	// No data - leave retVec empty
		return;

	LPBYTE dataEnd = data + sizeof(data);
	LPBYTE delEnd = delimeter + sizeof(delimeter);
	size_t delSize = distance(delimeter, delEnd);
	
	LPBYTE found = std::search(data, dataEnd, delimeter, delEnd);
	
	if (found == delEnd)	// Delimeter not in data - leave retVec empty
		return;

	cout << "In separate(...)\n";
	if (data[0] == delimeter[0])
		cout << "data[0] == delimeter[0]\n";
	
	if (found == data)
		cout << "Found == data.\n(" << found[0] << " == " << data[0] << ")\n";

	if (found != data)  			// Found delimeter ends first split
		cout << "Found != data; found == data[" << distance(data, found) << "].\n";
	return;
};
int main()
{
	BYTE buffer[] = {',', '1', '2', '3', ',', '4', '5', '6', ',', '7', '8', '9', ',', 0};
	BYTE del = ',';
	bool bComp = true;

	LPBYTE found = std::search(&buffer[0], &buffer[0] + sizeof(buffer), &del, &del + sizeof(del));
	if (found == &buffer[0])
		cout << "found == &buffer[0]\n";
	else
		cout << "found == &buffer[" << distance(&buffer[0], found) << "]\n";

	vector< pair<LPBYTE, LPBYTE> > lpb;
	separate(lpb, buffer, &del, &bComp);

	return 0;
}

found == &buffer[0]
In separate(...)
data[0] == delimeter[0]
Found != data; Found == data[4]