Mercurial > gnulib
view lib/getlogin_r.c @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | bb182ee4a09d |
children | 344018b6e5d7 |
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/* Provide a working getlogin_r for systems which lack it. Copyright (C) 2005-2007, 2010-2013 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, see <http://www.gnu.org/licenses/>. */ /* Written by Paul Eggert, Derek Price, and Bruno Haible. */ #include <config.h> /* Specification. */ #include <unistd.h> #include <errno.h> #include <string.h> #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ # define WIN32_LEAN_AND_MEAN # include <windows.h> #else # if !HAVE_DECL_GETLOGIN extern char *getlogin (void); # endif #endif /* See unistd.in.h for documentation. */ int getlogin_r (char *name, size_t size) { #undef getlogin_r #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ /* Native Windows platform. */ DWORD sz; /* When size > 0x7fff, the doc says that GetUserName will fail. Actually, on Windows XP SP3, it succeeds. But let's be safe, for the sake of older Windows versions. */ if (size > 0x7fff) size = 0x7fff; sz = size; if (!GetUserName (name, &sz)) { if (GetLastError () == ERROR_INSUFFICIENT_BUFFER) /* In this case, the doc says that sz contains the required size, but actually, on Windows XP SP3, it contains 2 * the required size. */ return ERANGE; else return ENOENT; } return 0; #elif HAVE_GETLOGIN_R /* Platform with a getlogin_r() function. */ int ret = getlogin_r (name, size); if (ret == 0 && memchr (name, '\0', size) == NULL) /* name contains a truncated result. */ return ERANGE; return ret; #else /* Platform with a getlogin() function. */ char *n; size_t nlen; errno = 0; n = getlogin (); if (!n) /* ENOENT is a reasonable errno value if getlogin returns NULL. */ return (errno != 0 ? errno : ENOENT); nlen = strlen (n); if (size <= nlen) return ERANGE; memcpy (name, n, nlen + 1); return 0; #endif }