* lib/getlogin_r.c, lib/getlogin_r.h, m4/getlogin_r.m4,

[gnulib.git] / lib / getlogin_r.c

diff --git a/lib/getlogin_r.c b/lib/getlogin_r.c
new file mode 100644 (file)
index 0000000..5683504
--- /dev/null
+++ b/lib/getlogin_r.c
@@ -0,0 +1,59 @@
+/* Provide a working getlogin_r for systems which lack it.
+
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* written by Paul Eggert and Derek Price */
+
+#include <config.h>
+
+#include "getlogin_r.h"
+
+#include <errno.h>
+#include <string.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if !HAVE_DECL_GETLOGIN
+char *getlogin (void);
+#endif
+
+/* See getlogin_r.h for documentation.  */
+int
+getlogin_r (char *name, size_t size)
+{
+  char *n;
+  int save_errno = errno;
+
+  errno = 0;
+  n = getlogin ();
+  if (n)
+    {
+      size_t nlen = strlen (n);
+      if (nlen < size)
+        {
+          memcpy (name, n, nlen + 1);
+          return 0;
+        }
+      errno = ERANGE;
+    }
+
+  if (errno) return errno;
+  errno = save_errno;
+  return -1;
+}