wget/src/sysdep.h

/* Dirty system-dependent hacks.
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2004, 2005, 2006, 2007 Free Software Foundation, Inc.

This file is part of GNU Wget.

GNU Wget 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 3 of the License, or (at
your option) any later version.

GNU Wget 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 Wget.  If not, see <http://www.gnu.org/licenses/>.

In addition, as a special exception, the Free Software Foundation
gives permission to link the code of its release of Wget with the
OpenSSL project's "OpenSSL" library (or with modified versions of it
that use the same license as the "OpenSSL" library), and distribute
the linked executables.  You must obey the GNU General Public License
in all respects for all of the code used other than "OpenSSL".  If you
modify this file, you may extend this exception to your version of the
file, but you are not obligated to do so.  If you do not wish to do
so, delete this exception statement from your version.  */

/* This file is included by wget.h.  Random .c files need not include
   it.  */

#ifndef SYSDEP_H
#define SYSDEP_H

/* Testing for __sun is not enough because it's also defined on SunOS.  */
#ifdef __sun
# ifdef __SVR4
#  define solaris
# endif
#endif

/* The "namespace tweaks" below attempt to set a friendly "compilation
   environment" under popular operating systems.  Default compilation
   environment often means that some functions that are "extensions"
   are not declared -- `strptime' is one example.

   But non-default environments can expose bugs in the system header
   files, crippling compilation in _very_ non-obvious ways.  Because
   of that, we define them only on well-tested architectures where we
   know they will work.  */

#undef NAMESPACE_TWEAKS

#ifdef solaris
# define NAMESPACE_TWEAKS
#endif

#ifdef __linux__
# define NAMESPACE_TWEAKS
#endif

#ifdef NAMESPACE_TWEAKS

/* Request the "Unix 98 compilation environment". */
#define _XOPEN_SOURCE 500

/* For Solaris: request everything else that is available and doesn't
   conflict with the above.  */
#define __EXTENSIONS__

/* For Linux: request features of 4.3BSD and SVID (System V Interface
   Definition). */
#define _SVID_SOURCE
#define _BSD_SOURCE

/* Under glibc-based systems we want all GNU extensions as well.  This
   declares some unnecessary cruft, but also useful functions such as
   timegm, FNM_CASEFOLD extension to fnmatch, memrchr, etc.  */
#define _GNU_SOURCE

#endif /* NAMESPACE_TWEAKS */


/* Alloca declaration, based on recommendation in the Autoconf manual.
   These have to be after the above namespace tweaks, but before any
   non-preprocessor code.  */

#if HAVE_ALLOCA_H
# include <alloca.h>
#elif defined WINDOWS
# include <malloc.h>
# ifndef alloca
#  define alloca _alloca
# endif
#elif defined __GNUC__
# define alloca __builtin_alloca
#elif defined _AIX
# define alloca __alloca
#else
# include <stddef.h>
# ifdef  __cplusplus
extern "C"
# endif
void *alloca (size_t);
#endif

/* Must include these, so we can test for the missing stat macros and
   define them as necessary.  */
#include <sys/types.h>
#include <sys/stat.h>

#ifdef HAVE_INTTYPES_H
  /* Compaq C V6.5-303 (dtk) on HP Tru64 UNIX V5.1B (Rev. 2650) needs: */
# include <stdint.h>
# include <inttypes.h>
#endif

#ifdef WINDOWS
/* Windows doesn't have some functions normally found on Unix-like
   systems, such as strcasecmp, strptime, etc.  Include mswindows.h so
   we get the declarations for their replacements in mswindows.c, as
   well as to pick up Windows-specific includes and constants.  To be
   able to test for such features, the file must be included as early
   as possible.  */
# include "mswindows.h"
#endif

/* Provide support for C99-type boolean type "bool".  This blurb comes
   straight from the Autoconf 2.59 manual. */
#if HAVE_STDBOOL_H
# include <stdbool.h>
#else
# if ! HAVE__BOOL
#  ifdef __cplusplus
typedef bool _Bool;
#  else
typedef unsigned char _Bool;
#  endif
# endif
# define bool _Bool
# define false 0
# define true 1
# define __bool_true_false_are_defined 1
#endif

/* Needed for compilation under OS/2 and MSDOS */
#if defined(__EMX__) || defined(MSDOS)
# ifndef S_ISLNK
#  define S_ISLNK(m) 0
# endif
# ifndef lstat
#  define lstat stat
# endif
#endif /* __EMX__ || MSDOS */

/* Reportedly, stat() macros are broken on some old systems.  Those
   systems will have to fend for themselves, as I will not introduce
   new code to handle it.

   However, I will add code for *missing* macros, and the following
   are reportedly missing from many systems.  */
#ifndef S_ISLNK
# define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
#endif
#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & (_S_IFMT)) == (_S_IFDIR))
#endif
#ifndef S_ISREG
# define S_ISREG(m) (((m) & _S_IFMT) == _S_IFREG)
#endif

/* These are needed so we can #define struct_stat to struct _stati64
   under Windows. */
#ifndef struct_stat
# define struct_stat struct stat
#endif
#ifndef struct_fstat
# define struct_fstat struct stat
#endif

/* For CHAR_BIT, LONG_MAX, etc. */
#include <limits.h>

#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif

/* From gnulib, simplified to assume a signed type. */
#define TYPE_MAXIMUM(t) ((t) (~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))

/* These are defined in cmpt.c if missing, so we must declare
   them.  */
#ifndef HAVE_STRCASECMP
int strcasecmp ();
#endif
#ifndef HAVE_STRNCASECMP
int strncasecmp ();
#endif
#ifndef HAVE_STRPTIME
char *strptime ();
#endif
#ifndef HAVE_TIMEGM
# include <time.h>
time_t timegm (struct tm *);
#endif
#ifndef HAVE_MEMRCHR
void *memrchr (const void *, int, size_t);
#endif

/* These are defined in snprintf.c.  It would be nice to have an
   snprintf.h, though.  */
#ifndef HAVE_SNPRINTF
int snprintf ();
#endif
#ifndef HAVE_VSNPRINTF
int vsnprintf ();
#endif

/* Some systems (Linux libc5, "NCR MP-RAS 3.0", and others) don't
   provide MAP_FAILED, a symbolic constant for the value returned by
   mmap() when it doesn't work.  Usually, this constant should be -1.
   This only makes sense for files that use mmap() and include
   sys/mman.h *before* sysdep.h, but doesn't hurt others.  */

#ifndef MAP_FAILED
# define MAP_FAILED ((void *) -1)
#endif

/* Enable system fnmatch only on systems where fnmatch.h is usable.
   If the fnmatch on your system is buggy, undef this symbol and a
   replacement implementation will be used instead.  */
#ifdef HAVE_WORKING_FNMATCH_H
# define SYSTEM_FNMATCH
#endif

#ifdef SYSTEM_FNMATCH
# include <fnmatch.h>
#else  /* not SYSTEM_FNMATCH */
/* Define fnmatch flags.  Undef them first to avoid warnings in case
   an evil library include chose to include system fnmatch.h.  */
# undef FNM_PATHNAME
# undef FNM_NOESCAPE
# undef FNM_PERIOD
# undef FNM_NOMATCH

# define FNM_PATHNAME	(1 << 0) /* No wildcard can ever match `/'.  */
# define FNM_NOESCAPE	(1 << 1) /* Backslashes don't quote special chars.  */
# define FNM_PERIOD	(1 << 2) /* Leading `.' is matched only explicitly.  */
# define FNM_NOMATCH	1

int fnmatch (const char *, const char *, int);
#endif

/* Provide sig_atomic_t if the system doesn't.  */
#ifndef HAVE_SIG_ATOMIC_T
typedef int sig_atomic_t;
#endif

/* Provide uint32_t on the platforms that don't define it.  Although
   most code should be agnostic about integer sizes, some code really
   does need a 32-bit integral type.  Such code should use uint32_t.
   (The exception is gnu-md5.[ch], which uses its own detection for
   portability across platforms.)  */

#ifndef HAVE_UINT32_T
# if SIZEOF_INT == 4
typedef unsigned int uint32_t;
# else
#  if SIZEOF_LONG == 4
typedef unsigned long uint32_t;
#  else
#   if SIZEOF_SHORT == 4
typedef unsigned short uint32_t;
#   else
 #error "Cannot determine a 32-bit unsigned integer type"
#   endif
#  endif
# endif
#endif

/* If uintptr_t isn't defined, simply typedef it to unsigned long. */
#ifndef HAVE_UINTPTR_T
typedef unsigned long uintptr_t;
#endif

/* If intptr_t isn't defined, simply typedef it to long. */
#ifndef HAVE_INTPTR_T
typedef long intptr_t;
#endif

#endif /* SYSDEP_H */