#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>

/* This routine returns the size of the file it is called with. */

static unsigned
get_file_size (const char * file_name)
{
    struct stat sb;
    if (stat (file_name, & sb) != 0) {
        fprintf (stderr, "'stat' failed for '%s': %s.\n",
                 file_name, strerror (errno));
        exit (EXIT_FAILURE);
    }
    return sb.st_size;
}

/* This routine reads the entire file into memory. */

static unsigned char *
read_whole_file (const char * file_name)
{
    unsigned s;
    unsigned char * contents;
    FILE * f;
    size_t bytes_read;
    int status;

    s = get_file_size (file_name);
    contents = malloc (s + 1);
    if (! contents) {
        fprintf (stderr, "Not enough memory.\n");
        exit (EXIT_FAILURE);
    }

    f = fopen (file_name, "r");
    if (! f) {
        fprintf (stderr, "Could not open '%s': %s.\n", file_name,
                 strerror (errno));
        exit (EXIT_FAILURE);
    }
    bytes_read = fread (contents, sizeof (unsigned char), s, f);
    if (bytes_read != s) {
        fprintf (stderr, "Short read of '%s': expected %d bytes "
                 "but got %d: %s.\n", file_name, s, bytes_read,
                 strerror (errno));
        exit (EXIT_FAILURE);
    }
    status = fclose (f);
    if (status != 0) {
        fprintf (stderr, "Error closing '%s': %s.\n", file_name,
                 strerror (errno));
        exit (EXIT_FAILURE);
    }
    return contents;
}

int main ()
{
    unsigned char * file_contents;
    file_contents = read_whole_file ("rwf.c");

    free (file_contents);
    return 0;
}