readfile.c

/*
 * readfile.c
 *
 * Demonstration on how to get filesize of a given file,
 * open it and print it to console, using C standard library
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

long int size = 0;
char *content;

char* readFile(char* filename)
{
    FILE* file = fopen(filename,"r");
    if(file == NULL)
    {
        return NULL;
    }

    fseek(file, 0, SEEK_END);
    size = ftell(file);
    rewind(file);

    content = calloc(size + 1, 1);

    fread(content,1,size,file);

    return content;
}

int main(int argc,char **argv)
{
    FILE *file;
    char *myfile = calloc(256, sizeof(char));

    if(myfile)
    {
        /* get filesize */
        file = fopen("readfile.c", "r");
        fseek(file, 0, SEEK_END);
        size = ftell(file);
        rewind(file);
        fclose(file);

        printf("File size: %ld\n", size);

        /* get some extra RAM...*/
        myfile = realloc(myfile, sizeof(char) * 8);

        /* get file content */
        myfile = readFile("readfile.c");

        /* output file content */
        printf("%s", myfile);
        printf("\nTime to leave!\n\n");

        /* Free memory and exit */
        //free(content);
        free(myfile);

        return EXIT_SUCCESS;
    }

    /* if calloc() has failed... */
    return EXIT_FAILURE;
}