Work around porting bugs reported by Dieter in

<http://lists.gnu.org/archive/html/bug-bison/2006-01/msg00049.html>.
* lib/getopt.c (_NOPROTO): Remove; no longer needed.
Include <stdlib.h> and <unistd.h> in all environments; it's safe now.
Include "getopt.h" first, to check interface.
(getenv): Declare only if defined HAVE_DECL_GETENV &&
!HAVE_DECL_GETENV.
* lib/strndup.c [!_LIBC]: Include "strndup.h" to get prototype.
(__strndup): Revert to K&R-style function dfns, the glibc style.
* lib/strnlen.c: Don't claim it's taken from glibc; it's not.
(strnlen, __strnlen): Remove #defines and #undefs; not needed.
Include strnlen.h first, to get prototype properly.
(strnlen): Renamed from __strnlen.
Remove weak alias.
* m4/getopt.m4 (gl_PREREQ_GETOPT): Check for getenv decl.

1 files changed, 6 insertions, 21 deletions

diff --git a/lib/strnlen.c b/lib/strnlen.c
index 97a1f810c5..09ba788ab0 100644
--- a/lib/strnlen.c
+++ b/lib/strnlen.c
@@ -1,6 +1,6 @@
 /* Find the length of STRING, but scan at most MAXLEN characters.
-   Copyright (C) 1996, 1997, 1998, 2000-2003 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
+   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+   Written by Simon Josefsson.
 
    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
@@ -12,37 +12,22 @@
    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,
+   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.  */
 
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
-#undef strnlen
 
-#include <string.h>
-
-#undef __strnlen
-#undef strnlen
-
-#ifndef _LIBC
-# define strnlen rpl_strnlen
-#endif
-
-#ifndef weak_alias
-# define __strnlen strnlen
-#endif
+#include "strnlen.h"
 
 /* Find the length of STRING, but scan at most MAXLEN characters.
    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 
 size_t
-__strnlen (const char *string, size_t maxlen)
+strnlen (const char *string, size_t maxlen)
 {
   const char *end = memchr (string, '\0', maxlen);
   return end ? (size_t) (end - string) : maxlen;
 }
-#ifdef weak_alias
-weak_alias (__strnlen, strnlen)
-#endif