//
// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Creation Date: Tue Dec  9 21:10:17 PST 1997
// Last Modified: Wed Jun  7 20:55:18 PDT 2000 (added signed/unsigned option)
// Filename:      tools/todec.cpp
// URL:           https://github.com/craigsapp/midifile/blob/master/tools/todec.cpp
// Syntax:        C++11
// vim:           ts=3
//
// Description:   Convert hex bytes into decimal equivalents.
//

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

using namespace std;


unsigned long atohd      (const char* aNumber);
void          exitUsage  (const char* command);


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

int main(int argc, char* argv[]) {
	char* numberstring = NULL;
	int sign = 0;

	if (argc < 2) {
		exitUsage(argv[0]);
	} else if (argc == 3) {
		if (strcmp(argv[1], "-s") == 0) {
			sign = 1;
		} else {
			exitUsage(argv[0]);
		}
		numberstring = argv[2];
	} else if (argc == 2) {
		numberstring = argv[1];
	} else {
		exitUsage(argv[0]);
	}

	if (numberstring[0] == 'o' || numberstring[0] == 'O') {
		numberstring[0] = '0';
	}

	unsigned long aValue;
	aValue = atohd(numberstring);
	if (sign) {
		cout << (long)aValue << endl;
	} else {
		cout << aValue << endl;
	}

	return 0;
}


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

//////////////////////////////
//
// atohd -- Convert ASCII hex code into long.
//

unsigned long atohd(const char* aNumber) {
	return (int)strtoul(aNumber, (char**)NULL, 16);
}



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

void exitUsage(const char* command) {
	cout << "\n"
	"Converts an integer into decimal form.\n"
	"\n"
	"Usage: " << command << " [-s] integer\n"
	"\n"
	"Options:\n"
	"   -s = interpret hex values as signed values\n"
	"\n"
	"   signed integer =   [-0x80000000..0x7fffffff] \n"
	"                      [-2147483648..2147483647] \n"
	"   unsigned integer = [0x00000000..0xffffffff] \n"
	"                      [0..4294967295] \n"
	<< endl;
	exit(1);
}