#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

#define URL_DEFAULT "google.co.kr"

typedef struct content_s {
	size_t len;
	char *buf;
} content_t;

static size_t my_write(void *ptr, size_t size, size_t nmemb, void *stream)
{
	size_t addition = size * nmemb;
	char *new_buf;
	content_t *content = stream;

	if (!addition)
		return 0;

	new_buf = realloc(content->buf, content->len + addition + 1);
	if (!new_buf) {
		perror("realloc()");
		return 0;
	}
	content->buf = new_buf;

	memcpy(content->buf + content->len, ptr, addition);
	content->len += addition;

	return addition;
}

int main(int argc, char **argv)
{
	CURL *curl;
	CURLcode res;
	content_t content = { .len = 0, .buf = NULL};
	const char *url_str = argv[1];

	if (argc < 2)
		url_str = URL_DEFAULT;

	curl = curl_easy_init();
	if (!curl)
		return 1;

	curl_easy_setopt(curl, CURLOPT_VERBOSE, 10);
	curl_easy_setopt(curl, CURLOPT_URL, url_str);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_write);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &content);

	res = curl_easy_perform(curl);
	fprintf(stderr, "result: %s\n",  curl_easy_strerror(res));

	curl_easy_cleanup(curl);

	if (content.buf) {
		printf("\n------- my content ---------\n\n");
		content.buf[content.len] = 0;
		printf("%s\n", content.buf);
	}

	free(content.buf);

	return 0;
}