broken resize

// Copies a BMP file

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

#include "bmp.h"

int main(int argc, char *argv[])
{
    // ensure proper usage
    if (argc != 4)
    {
        fprintf(stderr, "Usage: ./resize scalefactor infile outfile\n");
        return 1;
    }
    //sanity check for numbers
    int factor = atoi(argv[1]);
    if (factor == 0 || factor > 100)
    {
        printf("Factors equal to 0 or above 100 are invalid. Enter a different number. \n");
        return 2;
    }
    // remember filenames
    char *infile = argv[2];
    char *outfile = argv[3];


    // open input file
    FILE *inptr = fopen(infile, "r");
    if (inptr == NULL)
    {
        fprintf(stderr, "Could not open %s.\n", infile);
        return 3;
    }

    // open output file
    FILE *outptr = fopen(outfile, "w");
    if (outptr == NULL)
    {
        fclose(inptr);
        fprintf(stderr, "Could not create %s.\n", outfile);
        return 4;
    }

    // read infile's BITMAPFILEHEADER
    BITMAPFILEHEADER bf;
    fread(&bf, sizeof(BITMAPFILEHEADER), 1, inptr);

    // read infile's BITMAPINFOHEADER
    BITMAPINFOHEADER bi;
    fread(&bi, sizeof(BITMAPINFOHEADER), 1, inptr);
    //creating outfile's BITMAPINFOHEADER
    // ensure infile is (likely) a 24-bit uncompressed BMP 4.0
    if (bf.bfType != 0x4d42 || bf.bfOffBits != 54 || bi.biSize != 40 ||
        bi.biBitCount != 24 || bi.biCompression != 0)
    {
        fclose(outptr);
        fclose(inptr);
        fprintf(stderr, "Unsupported file format.\n");
        return 5;
    }
    double oldw = bi.biWidth;
    bi.biWidth = bi.biWidth * factor;
    bi.biHeight = bi.biHeight * factor;

    // determine padding for scanlines
    int padding = (4 - (bi.biWidth * sizeof(RGBTRIPLE)) % 4) % 4;

    if (bi.biWidth % 4 != 0)
    {
        bi.biWidth = bi.biWidth + padding;
    }
    //outfile's  bi.bisizeim redef
    bi.biSizeImage = ((sizeof(RGBTRIPLE) * bi.biWidth) * abs(bi.biHeight));

    // write outfile's BITMAPFILEHEADER
    fwrite(&bf, sizeof(BITMAPFILEHEADER), 1, outptr);

    //outfile's bitinfo redef
    bf.bfSize = bi.biSizeImage + sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);

    // write outfile's BITMAPINFOHEADER, need to create a variable to change the
    fwrite(&bi, sizeof(BITMAPINFOHEADER), 1, outptr);

    printf("%i, %i", bi.biWidth, bi.biHeight);
    // iterate over infile's scanlines
    for (int i = 0, biHeight = abs(bi.biHeight); i < biHeight; i++)
    {
        for (int b = 0; b < factor; b++)
        {
            // iterate over pixels in scanline of initial file. Must be the old one because the old one is the one being manipulated, not the new width.
             for (int j = 0; j < oldw; j++)
             {
                // temporary storage
                RGBTRIPLE triple;
                RGBTRIPLE[] =

                // read RGB triple from infile
                fread(&triple, sizeof(RGBTRIPLE), 1, inptr);

                // write RGB triple to outfile
                for (int a = 0; a < factor; a++)
                {
                    fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr);
                }

             }
             //adding padding
            for (int k = 0; k < padding; k++)
            {
                fputc(0x00, outptr);
            }
        }

        // skip over padding, if any
        fseek(inptr, padding, SEEK_CUR);
    }

    // close infile
    fclose(inptr);

    // close outfile
    fclose(outptr);

    // success
    return 0;
}