81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* Copyright (c) 1997 - 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: get_default_username.c,v 1.3 1999/12/02 16:58:46 joda Exp $");
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#endif /* HAVE_CONFIG_H */
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#include "roken.h"
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/*
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* Try to return what should be considered the default username or
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* NULL if we can't guess at all.
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*/
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const char *
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get_default_username (void)
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{
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const char *user;
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user = getenv ("USER");
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if (user == NULL)
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user = getenv ("LOGNAME");
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if (user == NULL)
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user = getenv ("USERNAME");
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#if defined(HAVE_GETLOGIN) && !defined(POSIX_GETLOGIN)
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if (user == NULL) {
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user = (const char *)getlogin ();
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if (user != NULL)
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return user;
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}
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#endif
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#ifdef HAVE_PWD_H
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{
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uid_t uid = getuid ();
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struct passwd *pwd;
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if (user != NULL) {
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pwd = k_getpwnam (user);
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if (pwd != NULL && pwd->pw_uid == uid)
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return user;
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}
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pwd = k_getpwuid (uid);
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if (pwd != NULL)
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return pwd->pw_name;
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}
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#endif
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return user;
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}
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