new file

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@6319 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/get_default_username.c

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+/*
+ * Copyright (c) 1997 - 1999 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. All advertising materials mentioning features or use of this software 
+ *    must display the following acknowledgement: 
+ *      This product includes software developed by Kungliga Tekniska 
+ *      H<>gskolan and its contributors. 
+ *
+ * 4. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+RCSID("$Id$");
+#endif /* HAVE_CONFIG_H */
+
+#include "roken.h"
+
+/*
+ * Try to return what should be considered the default username or
+ * NULL if we can't guess at all.
+ */
+
+const char *
+get_default_username (void)
+{
+    const char *p;
+
+    p = getenv ("USER");
+    if (p != NULL)
+	return p;
+    p = getenv ("LOGNAME");
+    if (p != NULL)
+	return p;
+    p = getenv ("USERNAME");
+    if (p != NULL)
+	return p;
+#if defined(HAVE_GETLOGIN) && !defined(POSIX_GETLOGIN)
+    p = (const char *)getlogin ();
+    if (p != NULL)
+	return p;
+#endif
+#ifdef HAVE_PWD_H
+    {
+	struct passwd *pwd = k_getpwuid (getuid ());
+	if (pwd != NULL)
+	    return pwd->pw_name;
+    }
+#endif
+    return NULL;
+}