#include "attachments/read_file.h"
#include <stdlib.h>
#include <unistd.h>

struct FileContent read_file(int fd) {
    struct FileContent result;
    char *buf = calloc(4096, 1);
    if (buf == NULL) {
        result.size = -1;
        result.data = NULL;
        return result;
    }
    char *cur_buf = buf;
    size_t file_size = 0;
    size_t file_capacity = 4096;
    ssize_t read_res = read(fd, cur_buf, file_capacity);
    while (read_res > 0) {
        file_size += read_res;
        cur_buf += read_res;
        if (file_size == file_capacity) {
            file_capacity <<= 1;
            char *new_buf = realloc(buf, file_capacity);
            if (new_buf == NULL) {
                free(buf);
                result.size = -1;
                result.data = NULL;
                return result;
            }
            buf = new_buf;
            cur_buf = buf + file_size;
        }
        read_res = read(fd, cur_buf, file_capacity - file_size);
    }

    if (read_res == 0) {
        *cur_buf = 0;
        result.size = file_size;
        result.data = buf;
        return result;
    } else {
        result.size = -1;
        result.data = NULL;
        return result;
    }
}

#include <fcntl.h>
#include <stdio.h>

int main(int argc, char *argv[]) {
    struct FileContent file_content = read_file(open(argv[1], O_RDONLY));
    printf("%zu\n%s", file_content.size, file_content.data);
    free(file_content.data);
}