(nullable_compute): Do not subtract from the returned value of malloc.

[bison.git] / src / system.h

/* System-dependent definitions for Bison.
   Copyright (C) 2000, 2001, 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef BISON_SYSTEM_H
#define BISON_SYSTEM_H

#if HAVE_CONFIG_H
# include <config.h>
#endif

/* AIX requires this to be the first thing in the file.  */
#ifdef __GNUC__
# define alloca(Size) __builtin_alloca (Size)
#else
# if HAVE_ALLOCA_H
#  include <alloca.h>
# else
#  ifdef _AIX
 #pragma alloca
#  else
#   ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
#   endif
#  endif
# endif
#endif

#include <stdio.h>

/* Verify a requirement at compile-time (unlike assert, which is runtime).  */
#define verify(name, assertion) struct name {char name[(assertion) ? 1 : -1];}

#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif

#if HAVE_STDLIB_H
# include <stdlib.h>
#endif

/* The following test is to work around the gross typo in
   systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
   is defined to 0, not 1.  */
#if !EXIT_FAILURE
# undef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif

#ifndef EXIT_SUCCESS
# define EXIT_SUCCESS 0
#endif

#if HAVE_UNISTD_H
# include <unistd.h>
#endif

#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
# include <string.h>
/* An ANSI string.h and pre-ANSI memory.h might conflict.  */
# if !defined(STDC_HEADERS) && defined(HAVE_MEMORY_H)
#  include <memory.h>
# endif /* not STDC_HEADERS and HAVE_MEMORY_H */
#else /* not STDC_HEADERS and not HAVE_STRING_H */
# include <strings.h>
/* memory.h and strings.h conflict on some systems.  */
#endif /* not STDC_HEADERS and not HAVE_STRING_H */

#include <limits.h>

#include <xalloc.h>

/* From xstrndup.c.  */
char *xstrndup (const char *s, size_t n);


/*---------------------.
| Missing prototypes.  |
`---------------------*/

#if defined HAVE_DECL_STPCPY && !HAVE_DECL_STPCPY
char *stpcpy (char *dest, const char *src);
#endif

#if defined HAVE_DECL_STRCHR && !HAVE_DECL_STRCHR
char *strchr (const char *s, int c);
#endif

#if defined HAVE_DECL_STRSPN && !HAVE_DECL_STRSPN
size_t strspn (const char *s, const char *accept);
#endif

#if defined HAVE_DECL_STRNLEN && !HAVE_DECL_STRNLEN
size_t strnlen (const char *s, size_t maxlen);
#endif

#if defined HAVE_DECL_MEMCHR && !HAVE_DECL_MEMCHR
void *memchr (const void *s, int c, size_t n);
#endif

#if defined HAVE_DECL_MEMRCHR && !HAVE_DECL_MEMRCHR
void *memrchr (const void *s, int c, size_t n);
#endif



/*-----------------.
| GCC extensions.  |
`-----------------*/

/* Use this to suppress gcc's `...may be used before initialized'
   warnings.  */
#ifdef lint
# define IF_LINT(Code) Code
#else
# define IF_LINT(Code) /* empty */
#endif

#ifndef __attribute__
/* This feature is available in gcc versions 2.5 and later.  */
# if !defined (__GNUC__) || __GNUC__ < 2 || \
(__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
#  define __attribute__(Spec) /* empty */
# endif
#endif

/* The __-protected variants of `format' and `printf' attributes
   are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
# define __format__ format
# define __printf__ printf
#endif

#ifndef ATTRIBUTE_NORETURN
# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
#endif

#ifndef ATTRIBUTE_UNUSED
# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#endif

/*------.
| NLS.  |
`------*/

#if HAVE_LOCALE_H
# include <locale.h>
#endif
#if !HAVE_SETLOCALE
# define setlocale(Category, Locale)
#endif

#include <gettext.h>
#define _(Msgid)  gettext (Msgid)
#define N_(Msgid) (Msgid)


/*-------------------------------.
| Fix broken compilation flags.  |
`-------------------------------*/

#ifndef LOCALEDIR
# define LOCALEDIR "/usr/local/share/locale"
#endif


/*-----------.
| Booleans.  |
`-----------*/

#if HAVE_STDBOOL_H
# include <stdbool.h>
#else
typedef enum {false = 0, true = 1} bool;
#endif


/*-----------.
| Obstacks.  |
`-----------*/

# define obstack_chunk_alloc xmalloc
# define obstack_chunk_free  free
# include <obstack.h>

#define obstack_sgrow(Obs, Str) \
  obstack_grow (Obs, Str, strlen (Str))

#define obstack_fgrow1(Obs, Format, Arg1)	\
do {						\
  char buf[4096];				\
  sprintf (buf, Format, Arg1);			\
  obstack_grow (Obs, buf, strlen (buf));	\
} while (0)

#define obstack_fgrow2(Obs, Format, Arg1, Arg2)	\
do {						\
  char buf[4096];				\
  sprintf (buf, Format, Arg1, Arg2);		\
  obstack_grow (Obs, buf, strlen (buf));	\
} while (0)

#define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3)	\
do {							\
  char buf[4096];					\
  sprintf (buf, Format, Arg1, Arg2, Arg3);		\
  obstack_grow (Obs, buf, strlen (buf));		\
} while (0)

#define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4)	\
do {								\
  char buf[4096];						\
  sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4);		\
  obstack_grow (Obs, buf, strlen (buf));			\
} while (0)



/*-----------------------------------------.
| Extensions to use for the output files.  |
`-----------------------------------------*/

#ifdef VMS
  /* VMS. */
# define TAB_EXT	"_tab"
# define OUTPUT_EXT	".output"
#else /* ! VMS */
# ifdef MSDOS
   /* MS DOS. */
#  define TAB_EXT	"_tab"
#  define OUTPUT_EXT	".out"
# else /* ! MSDOS */
  /* Standard. */
#  define TAB_EXT	".tab"
#  define OUTPUT_EXT	".output"
# endif /* ! MSDOS */
#endif /* ! VMS */

#ifndef DEFAULT_TMPDIR
# define DEFAULT_TMPDIR "/tmp"
#endif



/*---------------------.
| Free a linked list.  |
`---------------------*/

#define LIST_FREE(Type, List)			\
do {						\
  Type *_node, *_next;				\
  for (_node = List; _node; _node = _next)	\
    {						\
      _next = _node->next;			\
      XFREE (_node);				\
    }						\
} while (0)


/*---------------------------------------------.
| Debugging memory allocation (must be last).  |
`---------------------------------------------*/

# if WITH_DMALLOC
#  define DMALLOC_FUNC_CHECK
#  include <dmalloc.h>
# endif /* WITH_DMALLOC */

#endif  /* ! BISON_SYSTEM_H */