Binary extraction in C

carve.c

#include <stdio.h>

void carve_file(const char *input_file, const char *output_file, size_t start_byte, size_t end_byte){
    FILE *file_in = NULL;
    FILE *file_out = NULL;

    file_in = fopen(input_file, "rb");
    if (!file_in) {
        printf("Failed to open input file - %s\n", input_file);
        goto defer;
    }

    file_out = fopen(output_file, "wb");
    if (!file_out) {
        printf("Failed to open output file - %s\n", output_file);
        goto defer;
    }

    if (fseek (file_in, start_byte, SEEK_SET)){
        printf("Failed to set seek position - %s: %zu\n", input_file, start_byte);
        goto defer;
    }

    char buffer;
    while (fread(&buffer, sizeof(buffer), 1, file_in) != 0){
        if (fwrite(&buffer, sizeof(buffer), 1, file_out) == 0){
            printf("Failed to write a byte - %s: from %s %zu\n", output_file, input_file, ftell(file_in));
            goto defer;
        }
        if (ftell(file_in) >=end_byte){
            goto defer;
        }
    }

defer:
    if (file_in) fclose(file_in);
    if (file_out) fclose(file_out);
}