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# c-std.h: the first header files.
#
# Copyright (C) 1992, 2011 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 3 of the License, 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/>.
#
#ifndef C_STD_H
#define C_STD_H
/* Header files that essentially all of our sources need, and
that all implementations have. We include these first, to help with
NULL being defined multiple times. */
#include <math.h>
#include <stdio.h>
/* POSIX.1 says that <unistd.h> may require <sys/types.h>. */
#include <sys/types.h>
/* This is the symbol that X uses to determine if <sys/types.h> has been
read, so we define it. */
#define __TYPES__
/* And X uses this symbol to say whether we have <stddef.h> etc. */
#ifndef STDC_HEADERS
#define X_NOT_STDC_ENV
#endif
/* Be sure we have constants from <unistd.h>. */
#include "c-unistd.h"
#if STDC_HEADERS
#include <stdlib.h>
/* Include <stdlib.h> first to help avoid NULL redefinitions on some
systems. Now that we no longer include <stdlib.h> it may be
irrelevant. */
#else
extern char *getenv ();
#ifndef ALLOC_RETURN_TYPE
#ifdef DOS
#define ALLOC_RETURN_TYPE void
#else
#define ALLOC_RETURN_TYPE char
#endif /* not DOS */
#endif /* not ALLOC_RETURN_TYPE */
extern ALLOC_RETURN_TYPE *calloc (), *malloc (), *realloc ();
#endif /* not STDC_HEADERS */
/* strchr vs. index, memcpy vs. bcopy, etc. */
#include "c-memstr.h"
/* Error numbers and errno declaration. */
#include "c-errno.h"
/* Numeric minima and maxima. */
#include "c-minmax.h"
/* popen is part of POSIX.2, not POSIX.1. So STDC_HEADERS isn't enough. */
extern FILE *popen ();
extern double hypot ();
#endif /* not C_STD_H */
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