#include <stdlib.h>
#include <stdio.h>
#include <pwd.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <errno.h>

int main()
{
	struct passwd pwd, *result = NULL;
	char *buf;
	size_t bufsize;
	int s;

	bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
	assert(bufsize > 0 && bufsize < 0x100000);

	buf = malloc(bufsize);
	assert(buf);

	s = getpwnam_r("root", &pwd, buf, bufsize, &result);
	assert(!s);
	assert(pwd.pw_uid == 0);
	assert(!strcmp(pwd.pw_name, "root"));
	assert(strlen(pwd.pw_passwd) <= 1000);

	s = getpwuid_r(0, &pwd, buf, bufsize, &result);
	assert(!s);
	assert(pwd.pw_uid == 0);
	assert(!strcmp(pwd.pw_name, "root"));
	assert(strlen(pwd.pw_passwd) <= 1000);

	result = getpwnam("root");
	assert(result);
	assert(result->pw_uid == 0);
	assert(!strcmp(result->pw_name, "root"));
	assert(strlen(result->pw_passwd) <= 1000);

	result = getpwuid(0);
	assert(result);
	assert(result->pw_uid == 0);
	assert(!strcmp(result->pw_name, "root"));
	assert(strlen(result->pw_passwd) <= 1000);

	errno = 0;
	setpwent();
	assert(errno == 0);

	errno = 0;
	result = getpwent();
	assert(result);

	pwd = *result;
	pwd.pw_name = strdup(result->pw_name);
	pwd.pw_passwd = strdup(result->pw_passwd);
	pwd.pw_gecos = strdup(result->pw_gecos);
	pwd.pw_dir = strdup(result->pw_dir);
	pwd.pw_shell = strdup(result->pw_shell);
	assert(pwd.pw_name);
	assert(pwd.pw_passwd);
	assert(pwd.pw_gecos);
	assert(pwd.pw_dir);
	assert(pwd.pw_shell);

	errno = 0;
	setpwent();
	assert(errno == 0);

	errno = 0;
	result = getpwent();
	assert(result);

	assert(!strcmp(pwd.pw_name, result->pw_name));
	assert(!strcmp(pwd.pw_passwd, result->pw_passwd));
	assert(!strcmp(pwd.pw_gecos, result->pw_gecos));
	assert(!strcmp(pwd.pw_dir, result->pw_dir));
	assert(!strcmp(pwd.pw_shell, result->pw_shell));
	assert(pwd.pw_uid == result->pw_uid);
	assert(pwd.pw_gid == result->pw_gid);

	free(buf);
	free(pwd.pw_name);
	free(pwd.pw_passwd);
	free(pwd.pw_gecos);
	free(pwd.pw_dir);
	free(pwd.pw_shell);
}