/*
 * Copyright (c) 2013, 2014, 2021 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * pwd/getpwnam_r.c
 * Searchs the passwd database for a user with the given username.
 */

#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>

int getpwnam_r(const char* restrict username,
               struct passwd* restrict ret,
               char* restrict buf,
               size_t buflen,
               struct passwd** restrict ret_ptr)
{
	if ( !ret_ptr )
		return errno = EINVAL;
	if ( !username || !ret || !buf )
		return *ret_ptr = NULL, errno = EINVAL;
	FILE* fpasswd = openpw();
	if ( !fpasswd )
		return *ret_ptr = NULL, errno;
	int errnum;
	while ( (errnum = fgetpwent_r(fpasswd, ret, buf, buflen, ret_ptr)) == 0 &&
	        *ret_ptr )
	{
		if ( strcmp((*ret_ptr)->pw_name, username) != 0 )
			continue;
		fclose(fpasswd);
		return *ret_ptr = *ret_ptr, 0;
	}
	fclose(fpasswd);
	return *ret_ptr = NULL, errnum ? errnum : 0;
}