input_pump.c

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>

#define BUFFER_SIZE 0x10000

int write_getline(FILE* file)
{
    // buffer 
    static char buffer[BUFFER_SIZE];

    // buffer information
    char* bufferptr = &buffer[0];
    size_t buffersize = BUFFER_SIZE;

    // return result from getline
    int result;

    // print data
    result = getline(&bufferptr, &buffersize, stdin);

    // if any data is given
    if(1 < result) 
    { 
        fputs(bufferptr, file); 
        return 1;
    }
    else { return 0; }
}

int main(int argc, char** argv)
{
    // open stream
    FILE* stream;
 
    // check if arguments are working
    if(argc == 2)
    {
        // open file
        stream = fopen(argv[1], "a");

        // check if file is open
        if(stream != NULL) 
        {
            printf("Successfully Opened Stream \"%s\"\n", argv[1]);
            fprintf(stream, "\nUser \"%s\" Has Just Connected To This Stream! (%s)\n", getenv("USER"), argv[1]);

            // create shell like interface
            do { printf("%s> ", argv[1]); } 
            while(write_getline(stream));
            
            // close file
            fclose(stream);
        } 

        // printe error if file cant be opened
        else { printf("Unable to open stream! (%s)\n", argv[1]); }
    } 
    
    // print error if invalid arguments are given
    else 
    {
        printf("Invalid Arguments!\n");
        printf("Use: %s <stream name>\n", argv[0]);
    }
}