Chunk Copy

A small buffer can copy a file in chunks until fread reaches the end.

chunk_copy.c

#include <stdio.h>

int main(void) {
    int take = ;
    char input[6] = {'a', 'b', 'c', 'd', 'e', 'f'};
    char buffer[3];
    int total = 0;

    FILE *out = fopen("egtry_c17_source.bin", "wb");
    fwrite(input, sizeof(input[0]), take, out);
    fclose(out);

    FILE *in = fopen("egtry_c17_source.bin", "rb");
    int read = (int)fread(buffer, sizeof(buffer[0]), 3, in);
    while (read > 0) {
        total = total + read;
        read = (int)fread(buffer, sizeof(buffer[0]), 3, in);
    }
    fclose(in);
    remove("egtry_c17_source.bin");

    printf("copied=%d\n", total);
    return 0;
}

#include <stdio.h>

int main(void) {
    int take = ;
    char input[6] = {'a', 'b', 'c', 'd', 'e', 'f'};
    char buffer[3];
    int total = 0;

    FILE *out = fopen("egtry_c17_source.bin", "wb");
    fwrite(input, sizeof(input[0]), take, out);
    fclose(out);

    FILE *in = fopen("egtry_c17_source.bin", "rb");
    int read = (int)fread(buffer, sizeof(buffer[0]), 3, in);
    while (read > 0) {
        total = total + read;
        read = (int)fread(buffer, sizeof(buffer[0]), 3, in);
    }
    fclose(in);
    remove("egtry_c17_source.bin");

    printf("copied=%d\n", total);
    return 0;
}

#include <stdio.h>

int main(void) {
    int take = ;
    char input[6] = {'a', 'b', 'c', 'd', 'e', 'f'};
    char buffer[3];
    int total = 0;

    FILE *out = fopen("egtry_c17_source.bin", "wb");
    fwrite(input, sizeof(input[0]), take, out);
    fclose(out);

    FILE *in = fopen("egtry_c17_source.bin", "rb");
    int read = (int)fread(buffer, sizeof(buffer[0]), 3, in);
    while (read > 0) {
        total = total + read;
        read = (int)fread(buffer, sizeof(buffer[0]), 3, in);
    }
    fclose(in);
    remove("egtry_c17_source.bin");

    printf("copied=%d\n", total);
    return 0;
}

chunk Each loop copies only the bytes that were actually read.

total bytes Counting copied bytes verifies how much data moved through the buffer.