//
// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Creation Date: Tue Dec  9 20:36:13 PST 1997
// Last Modified: Tue Jan 27 21:23:56 GMT-0800 1998
// Filename:      tools/tohex.cpp
// URL:           https://github.com/craigsapp/midifile/blob/master/tools/tohex.cpp
// Syntax:        C++11
// vim:           ts=3
//
// Description:   Convert decimal value to hex.
//

#include <cctype>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iomanip>
#include <iostream>

using namespace std;


int   atohd       (const char* aNumber);
void  exitUsage   (const char* command);


///////////////////////////////////////////////////////////////////////////

int main(int argc, char* argv[]) {
	if (argc != 2) {
		exitUsage(argv[0]);
	}

	int aValue;
	aValue = atohd(argv[1]);
	cout << "0x" << hex << aValue << endl;

	return 0;
}


///////////////////////////////////////////////////////////////////////////

//////////////////////////////
//
// atohd -- ASCII hex code byte to integer.
//

int atohd(const char* aNumber) {
	if (strchr(aNumber, 'x') != NULL) {
		return (int)strtol(aNumber, (char**)NULL, 16);
	} else {
		return atoi(aNumber);
	}
}



//////////////////////////////
//
// exitUsage --
//

void exitUsage(const char* command) {
		cout << endl;
		cout << "Converts an integer into hexadecimal form.\n";
		cout << endl;
		cout << "Usage: " << command << " integer" << endl;
		cout << endl;
		cout << "   integer = [-2147483648..2147483647] \n";
		cout << "             [-0x80000000..0x7fffffff] \n";
		cout << endl;
		exit(1);
}