Readline accept int from console in C

I would like to have readline accept an int. What is the best way to accomplish this? I have no problem accepting string input like so:

 char *usrname; // define user input

 /* accept input */
 printf("Enter new name:");
 usrname = readline(NULL);

I do understand that having 开发者_StackOverflow社区an int will require some error checking on the before accepting the input.

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Eduardo Costa's answer works, but it leaks memory. It's better to define a function to take care of this for you:

int readint(char *p, char **e)
{
    char *c = readline(p);
    int i = strtol(c, e, 0);
    if(e)
      {
        size_t o = (size_t)(*e - c),
               l = strlen(*e) + 1;
        *e = malloc(l);
        // error checking omitted
        memcpy(*e, c + o, l);
      }
    free(c);
    return i;
}

This version will even preserve any extra stuff on the line so you can use it later if you need it. Of course, if you need to do a lot with the extra stuff you may be better off just reading the line and parsing it yourself rather than with functions like this.

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Have you tried something like this?

int i = atoi(readline(NULL));