BSD 4_3_Net_2 release

[unix-history] / usr / src / lib / libc / gen / getlogin.c

diff --git a/usr/src/lib/libc/gen/getlogin.c b/usr/src/lib/libc/gen/getlogin.c
index 6159806..a13d51c 100644 (file)
--- a/usr/src/lib/libc/gen/getlogin.c
+++ b/usr/src/lib/libc/gen/getlogin.c
@@ -1,33 +1,76 @@
+/*
+ * Copyright (c) 1988 The Regents of the University of California.
+ * 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 the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+

 #if defined(LIBC_SCCS) && !defined(lint)
 #if defined(LIBC_SCCS) && !defined(lint)

-static char sccsid[] = "@(#)getlogin.c 5.3 (Berkeley) %G%";
-#endif LIBC_SCCS and not lint
+static char sccsid[] = "@(#)getlogin.c 5.9 (Berkeley) 2/23/91";
+#endif /* LIBC_SCCS and not lint */

 
 

+#include <sys/param.h>
+#include <pwd.h>

 #include <utmp.h>
 #include <utmp.h>

+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>

 
 

-static char UTMP[]     = "/etc/utmp";
-static struct utmp ubuf;
+int    _logname_valid;         /* known to setlogin() */

 
 char *
 getlogin()
 {
 
 char *
 getlogin()
 {

-       register int me, uf;
-       register char *cp;
+       static char logname[MAXLOGNAME + 1];
+
+       if (_logname_valid == 0) {
+               if (_getlogin(logname, sizeof(logname) - 1) < 0)
+                       return ((char *)NULL);
+               _logname_valid = 1;
+       }
+       return (*logname ? logname : (char *)NULL);
+}
+
+char *
+cuserid(s)
+       char *s;
+{
+       register struct passwd *pwd;

 
 

-       if (!(me = ttyslot()))
-               return(0);
-       if ((uf = open(UTMP, 0)) < 0)
-               return (0);
-       lseek (uf, (long)(me*sizeof(ubuf)), 0);
-       if (read(uf, (char *)&ubuf, sizeof (ubuf)) != sizeof (ubuf)) {
-               close(uf);
-               return (0);
+       if ((pwd = getpwuid(geteuid())) == NULL) {
+               if (s)
+                       *s = '\0';
+               return (s);
+       }
+       if (s) {
+               (void)strncpy(s, pwd->pw_name, L_cuserid);
+               return (s);

        }
        }

-       close(uf);
-       if (ubuf.ut_name[0] == '\0')
-               return (0);
-       ubuf.ut_name[sizeof (ubuf.ut_name)] = ' ';
-       for (cp = ubuf.ut_name; *cp++ != ' '; )
-               ;
-       *--cp = '\0';
-       return (ubuf.ut_name);
+       return (pwd->pw_name);

 }
 }