Validation of user input ( month/day)

User has to input date in mm/dd format, anything else creates error:

Code:

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cout << "Please enter the month and day (mm/dd) >> ";
cin.getline(buffer, 80);
               
if (strpbrk("/", buffer))
{
        month = atoi ( strtok(buffer, "/") );
        if (NULL)
                day = atoi (strtok(NULL, "\n") );               
}
               
if (month < 1 || month > 12 || day < 1 || day > 31)
        cout << buffer << " is not a valid date.";

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It's working in 99.99% cases. 0.01% is input like "/", which screws me up and "Bus error" appears. Any ideas?

Shouldn't have spoon fed you...

Code:

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#include <iostream>
#include <exception>
#include <string>

struct Date {
        unsigned int month;
        unsigned int day;
};

Date GetDateFromString (const std::string& dateString)
{
        Date date = {0, 0};
        char buff[2];       
       
        //        Check for the correct format...
        if (dateString.length() != 5)
                throw ("The date string must be 5 characters long.");

        size_t slashPos = dateString.find_first_of ('/');
       
        if (slashPos == std::string::npos)
                throw ("Error parsing date. No slash was found.");
        else if (slashPos != 2)
                throw ("Error parsing date. The slash is not positioned correctly.");
       
        //        Convert from string to integer
        dateString.copy (buff, 2);
        date.month = atoi (buff);
        if (date.month == 0)
                throw ("Error parsing date. Incorrect number provided for month");
       
        dateString.copy (buff, 2, 3);
        date.day = atoi (buff);
        if (date.day == 0)
                throw ("Error parsing date. Incorrect number provided for day");
       
        return date;
}

int main ()
{
        std::string dateString;
        Date date;
       
        try {
                std::cout << "Please enter the month and day (mm/dd): ";
                std::cin >> dateString;
               
                Date date = GetDateFromString (dateString);
               
                std::cout << "Month: " << date.month << std::endl;
                std::cout << "Day: " << date.day << std::endl;
        }
        catch (const char * exception)
        {
                std::cout << exception << std::endl;
                return -1;               
        }
       
        return 0;
}

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