uconnect script injecter

#include <stdio.h>
#include <string.h>

unsigned int start_pos = 0xEBD3800;
unsigned int write_pos = 0xEBD4580;
const unsigned int org_script_size = 9587;
unsigned int max_script_size = 6064;

int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        printf("usage: %s script_to_inject dst_iso\r\n", argv[0]);
        return 1;
    }
    FILE *f_in = fopen(argv[1], "rb");
    if (!f_in)
    {
        printf("could not open src script %s\r\n", argv[1]);
        return 2;
    }
    FILE *f_out = fopen(argv[2], "r+b");
    if (!f_out)
    {
        printf("could not open dst iso %s\r\n", argv[2]);
        return 3;
    }

    char buf[org_script_size];
    int script_size = fread(buf, 1, org_script_size, f_in);
    if (script_size > max_script_size)
    {
        printf("script size too large\r\n");
        return 4;
    }
    //EBD3800
    //3456
    fseek(f_out, write_pos, SEEK_SET);
    fwrite(buf, 1, script_size, f_out);
    strcpy(buf, "return false,\"Script finished\", STOP_SWDL_CLEAR_UPDATE\x0A");
    fwrite(buf, 1, strlen(buf), f_out);
    int num_filler_bytes = org_script_size - script_size - strlen(buf) - ( write_pos - start_pos ) - 4;
    memset(buf, 0x0A, num_filler_bytes);
    fwrite(buf, 1, num_filler_bytes, f_out);
    fclose(f_in);
    fclose(f_out);
    printf("all done\r\n");
    return 0;
}