/*
 * Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
 * Copyright 2023, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 */


#include <syscalls.h>

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

#include <errno_private.h>
#include <user_group.h>


char*
getlogin()
{
        struct passwd *pw;
        pw = getpwuid(getuid());
        if (pw)
                return pw->pw_name;
        __set_errno(ENOMEM);
        return NULL;
}


int
getlogin_r(char *name, size_t nameSize)
{
        struct passwd* pw = NULL;
        struct passwd passwdBuffer;
        char passwdStringBuffer[MAX_PASSWD_BUFFER_SIZE];

        int status = getpwuid_r(getuid(), &passwdBuffer, passwdStringBuffer,
                sizeof(passwdStringBuffer), &pw);
        if (status != B_OK)
                return status;

        if (strnlen(pw->pw_name, LOGIN_NAME_MAX) >= nameSize)
                return ERANGE;

        memset(name, 0, nameSize);
        strlcpy(name, pw->pw_name, LOGIN_NAME_MAX);
        return B_OK;
}


char *
cuserid(char *s)
{
        if (s != NULL && getlogin_r(s, L_cuserid))
                return s;

        return getlogin();
}