# Pastebin fXAwFgdM
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <pwd.h>

void home(char*);

int
main()
{
    FILE *fp;
    char homedir[255], buffer[255];
    char line[128];

    home(homedir);
    strcpy(buffer, homedir);
    strcat(buffer, "/file.txt");
    
    fp = fopen(buffer, "r");
    if (!fp)
    {
        switch (errno)
        {
            case ENOENT:
            {
                perror("File not found"); 
                fp = fopen(buffer, "w+");
                if (!fp)
                {
                    perror("Failed to create file");
                    return EXIT_FAILURE;
                }
                /* write default file contents here */
                fprintf(fp, "SHAREDIR = ~/share\n");
                fprintf(fp, "LOGFILE  = ~/file.log\n");
                fprintf(fp, "MOTD     = Message of the day\n");
                /* LOG THIS!  */
                break;
            }
            default:
                perror("Failed to open file");
                return EXIT_FAILURE;
        }
    }
    /* read existing config here */
    while(fgets(line, 128, fp)!=NULL)
    {
        /* do something with the line that has been read */
        printf("%s"
, line);
    }
    fclose(fp);
    return EXIT_SUCCESS;
}


void
home(char *homedir)
{
    struct passwd *user;
    uid_t userid;

    strcpy(homedir, getenv("HOME"));

    if (homedir)
    {
        return;
    }
    else
    {
        userid = getuid();
        user = getpwuid(userid);

        if (user)
        {
            strcpy(homedir, user->pw_dir);
            return;
        }
        else
        {
            return;
        }
    }
}