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

#define prefixcmp(haystack, needle) strncmp(haystack, needle, strlen(needle))
#define xcalloc(n, size) calloc(n, size)
#define xstrdup(str) strdup(str)

static char *anonymize_url(const char *url)
{
	char *anon_url;
	const char *at_sign = strchr(url, '@');
	size_t len, prefix_len = 0;

	if (!at_sign)
		return xstrdup(url);

	if (!prefixcmp(url, "ssh://"))
		prefix_len = strlen("ssh://");
	else if (!prefixcmp(url, "http://"))
		prefix_len = strlen("http://");
	else if (!prefixcmp(url, "https://"))
		prefix_len = strlen("https://");
	else if (!strchr(at_sign + 1, ':'))
		return xstrdup(url);

	len = prefix_len + strlen(at_sign + 1);
	anon_url = xcalloc(1, 1 + prefix_len + strlen(at_sign + 1));
	if (prefix_len)
		memcpy(anon_url, url, prefix_len);
	memcpy(anon_url + prefix_len, at_sign + 1, strlen(at_sign + 1));

	return anon_url;
}

int main(int argc, char **argv)
{
	int errors = 0;
	struct {
		char *raw;
		char *correct;
	}
	urls[] = {
		{ "rsync://host.xz/path/to/repo.git/", NULL, },
		{ "http://host.xz:port/path/to/repo.git/", NULL, },
		{ "https://host.xz:port/path/to/repo.git/", NULL,},
		{ "git://host.xz:port/path/to/repo.git/", NULL, },
		{ "git://host.xz:port/~user/path/to/repo.git/", NULL, },
		{
			"http://user@host.xz:port/path/to/repo.git/",
				"http://host.xz:port/path/to/repo.git/",
		},
		{
			"https://user@host.xz:port/path/to/repo.git/",
				"https://host.xz:port/path/to/repo.git/",
		},
		{
			"ssh://user@host.xz:port/path/to/repo.git/",
				"ssh://host.xz:port/path/to/repo.git/",
		},
		{
			"ssh://user@host.xz/path/to/repo.git/",
				"ssh://host.xz/path/to/repo.git/",
		},
		{
			"ssh://user@host.xz/~user/path/to/repo.git/",
				"ssh://host.xz/~user/path/to/repo.git/",
		},
		{
			"user@host.xz:/path/to/repo.git/",
				"host.xz:/path/to/repo.git/",
		},
		{
			"user@host.xz:~user/path/to/repo.git/",
				"host.xz:~user/path/to/repo.git/",
		},
		{ NULL, NULL },
	};
	int i;

	for (i = 0; urls[i].raw; i++) {
		char *anon_url = anonymize_url(urls[i].raw);
		if (!strcmp(anon_url, urls[i].correct ? urls[i].correct : urls[i].raw))
			continue;

		errors++;
		printf("raw    : %s\nanon   : %s\n", urls[i].raw, anon_url);
		printf("correct: %s\n", urls[i].correct);
	}

	printf("There were %d errors\n", errors);
	return 0;
}