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Tip of the Day
Language: C++
Expertise: Intermediate
Nov 6, 2000

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Changing the Endian-ness of a Number

Suppose you receive an int from a remote host and you wish to convert it to big-endian order. Here is another portable solution for handling of big and little endian data formatting. This solution is based on the use of the right shift operator:

 
// big endian
int to_big_endian(int d)
{
 unsigned char buffer[sizeof (int)];
 buffer [0] = (char) d >> 24;
 buffer [1] = (char) d >> 16;
 buffer [2] = (char) d >> 8;
 buffer [3] = (char) d;
 return * (int*)buffer;
}

To convert an int to little endian byte ordering, use the following function:

 
// little endian 
int to_little_endian(int d)
{
 buffer [0] = (char) d;
 buffer [1] = (char) d >> 8;
 buffer [2] = (char) d >> 16;
 buffer [3] = (char) d >> 24;
 return * (int*)buffer;
}

These functions may not generate the fastest code, but they are portable. Tip #684 Intermediate Reading Strings that Contain Whitespaces The std::getline() functions reads data from an input stream and writes it to a string object. Unlike cin's >> operator, getline() also reads whitespaces, which makes it useful for reading strings that contain blanks. For example:

 
#include <string>
#include <iostream>
int main()
{
 std::string name;
 cout<<"enter first name and last name: ";
 std::getline(std::cin, name);
}

getline() has three parameters, the third of which is a delimiter serving as a string terminator. By default, the delimiter's value is '\n'. You can override this value and define a different delimiter. For example, you can define the sign '\t' (tab) as the delimiter:

 
std::getline(cin, name, '\t');
Danny Kalev
 
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