/**
 * cp.c
 *
 * week 6 section
 * fall 2013
 *
 * copy a file
 */

#include <stdint.h>
#include <stdio.h>

typedef uint8_t BYTE;

int main(int argc, char* argv[])
{
    // two and only two command-line arguments
    if (argc != 3)
    {
        printf("Usage: ./cp src dst\n");
        return 1;
    }

    // remember filenames
    char* src = argv[1];
    char* dst = argv[2];

    // open input file 
    FILE* srcptr = fopen(src, "r");
    if (srcptr == NULL)
    {
        printf("Could not open %s.\n", src);
        return 2;
    }

    // open output file
    FILE* dstptr = fopen(dst, "w");
    if (dstptr == NULL)
    {
        fclose(srcptr);
        fprintf(stderr, "Could not create %s.\n", dst);
        return 3;
    }
    
    // copy src into dest a byte at a time
    BYTE byte;
    while (fread(&byte, sizeof(BYTE), 1, srcptr))
    {
        fwrite(&byte, sizeof(BYTE), 1, dstptr);
    }

    // close infile
    fclose(srcptr);

    // close outfile
    fclose(dstptr);

    // that's all folks
    return 0;
}