gis/whoami.c

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/*!
 * \file lib/gis/whoami.c
 *
 * \brief GIS Library - Login name functions.
 *
 * SPDX-FileCopyrightText: 2001-2009 GRASS Development Team
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * \author Original author CERL
 */
#include <unistd.h>
#include <stdlib.h>
 
#ifndef _WIN32
#include <pwd.h>
#endif
 
#include <grass/gis.h>
 
/*!
 * \brief Gets user's name.
 *
 * Returns a pointer to a string containing the user's login name.
 *
 * Tries getlogin() first, then goes to the password file.
 * However, some masscomp getlogin() fails in ucb universe
 * because the ttyname(0) rotuine fails in ucb universe.
 * So we check for this, too.
 *
 * \return pointer to string ("anonymous" by default)
 */
const char *G_whoami(void)
{
    static int initialized;
    static const char *name;
 
    if (G_is_initialized(&initialized))
        return name;
 
#ifdef _WIN32
    name = getenv("USERNAME");
#endif
    if (!name || !*name)
        name = getenv("LOGNAME");
 
    if (!name || !*name)
        name = getenv("USER");
 
#ifndef _WIN32
    if (!name || !*name) {
        struct passwd *p = getpwuid(getuid());
 
        if (p && p->pw_name && *p->pw_name)
            name = G_store(p->pw_name);
    }
#endif
 
    if (!name || !*name)
        name = "anonymous";
 
    G_initialize_done(&initialized);
 
    return name;
}