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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/posix/cuserid.c
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initial import
Diffstat (limited to 'sysdeps/posix/cuserid.c')
-rw-r--r--sysdeps/posix/cuserid.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/sysdeps/posix/cuserid.c b/sysdeps/posix/cuserid.c
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+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <stdio.h>
+#include <string.h>
+#include <pwd.h>
+
+extern int EXFUN(geteuid, (NOARGS));
+
+
+/* Return the username of the caller.
+ If S is not NULL, it points to a buffer of at least L_cuserid bytes
+ into which the name is copied; otherwise, a static buffer is used. */
+char *
+DEFUN(cuserid, (s), char *s)
+{
+ static char name[L_cuserid];
+ struct passwd *pwent = getpwuid(geteuid());
+
+ if (pwent == NULL)
+ {
+ if (s != NULL)
+ s[0] = '\0';
+ return NULL;
+ }
+
+ if (s == NULL)
+ s = name;
+ return strcpy(s, pwent->pw_name);
+}