#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

#define BUTTON "\n### [More](https://urlz.fr/mqBB)"
#define TOTAL_SIZE 2272
#define MAX_SIZE TOTAL_SIZE - strlen(BUTTON)

char* read_file(const char* path)
{
    char* content;
    int fd;

    fd = open(path, O_RDONLY);
    if (fd == -1)
        goto open_fail;

    content = malloc((TOTAL_SIZE + 1) * sizeof(char));
    if (content == NULL)
        goto alloc_fail;

    int written = read(fd, content, MAX_SIZE);
    if (written == -1)
        goto read_fail;
    
    content[written] = '\0';

    close(fd);
    return content;

    read_fail:
    alloc_fail:
    free(content);

    open_fail:
    close(fd);
    return NULL;
}

int write_file(const char* path, const char* content)
{
    int fd = open(path, O_WRONLY | O_TRUNC);

    if (fd == -1)
        return 1;

    return write(fd, content, strlen(content));
}

int main(int ac, char **av)
{
    char* path;

    if (ac > 2)
        path = av[1];
    else
        path = "README_COMPLET.md";

    char* content = read_file(path);
    if (content == NULL)
        return 1;

    if (strlen(content) == MAX_SIZE)
        strcat(content, BUTTON);

    int ret = write_file("README.md", content);
    free(content);
    return ret;
}