system.h

/* system.h: system-dependent declarations; include this first.

   Copyright 1997-2022 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 TEXINFO_SYSTEM_H
#define TEXINFO_SYSTEM_H

#define _GNU_SOURCE

#include <config.h>

#ifdef MIKTEX
#include <gnu-miktex.h>
#define S_ISDIR(x) ((x)&_S_IFDIR)
#endif

/* Assume ANSI C89 headers are available.  */
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <stdarg.h>

/* Use POSIX headers.  If they are not available, we use the substitute
   provided by gnulib.  */
#include <getopt.h>
#include <unistd.h>

#include <fcntl.h>

/* For gettext (NLS).  */
#include "gettext.h"

#define _(String) gettext (String)
#define N_(String) (String)

/* Additional gnulib includes.  */
#include "mbchar.h"
#if HAVE_MBRTOWC
#include "mbiter.h"
#endif
#include "mbswidth.h"
#include "xalloc.h"

#include <errno.h>
#ifndef errno
extern int errno;
#endif
#ifdef VMS
#include <perror.h>
#endif

#ifndef HAVE_DECL_STRERROR
extern char *strerror ();
#endif

#include <limits.h>

#ifndef PATH_MAX
#ifndef _POSIX_PATH_MAX
# define _POSIX_PATH_MAX 255
#endif
#define PATH_MAX _POSIX_PATH_MAX
#endif

#include <sys/stat.h>
#if STAT_MACROS_BROKEN
# undef S_ISDIR
#endif
#if !defined(S_ISDIR) && defined(S_IFDIR)
# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif

/* MS-DOS and similar non-Posix systems have some peculiarities:
    - they distinguish between binary and text files;
    - they use both `/' and `\\' as directory separator in file names;
    - they can have a drive letter X: prepended to a file name;
    - they have a separate root directory on each drive;
    - their filesystems are case-insensitive;
    - directories in environment variables (like INFOPATH) are separated
        by `;' rather than `:';
    - text files can have their lines ended either with \n or with \r\n pairs;
   These are all parameterized here except the last, which is
   handled by the source code as appropriate (mostly, in info/).  */
#ifndef O_BINARY
# ifdef _O_BINARY
#  define O_BINARY _O_BINARY
# else
#  define O_BINARY 0
# endif
#endif /* O_BINARY */

#if O_BINARY
# ifdef HAVE_IO_H
#  include <io.h>
# endif
# ifdef __MSDOS__
#  include <limits.h>
#  ifdef __DJGPP__
#   define HAVE_LONG_FILENAMES(dir)  (pathconf (dir, _PC_NAME_MAX) > 12)
#   define NULL_DEVICE	"/dev/null"
#   define DEFAULT_INFOPATH "c:/djgpp/info;/usr/local/info;/usr/info;."
#  else  /* O_BINARY && !__DJGPP__ */
#   define HAVE_LONG_FILENAMES(dir)  (0)
#   define NULL_DEVICE	"NUL"
#  endif /* O_BINARY && !__DJGPP__ */
#  define SET_SCREEN_SIZE_HELPER terminal_prep_terminal()
#  define DEFAULT_INFO_PRINT_COMMAND ">PRN"
# else   /* O_BINARY && !__MSDOS__ */
#  ifndef setmode
#   define setmode(f,m)  _setmode(f,m)
#  endif
#  define HAVE_LONG_FILENAMES(dir)   (1)
#  define NULL_DEVICE	"NUL"
# endif  /* O_BINARY && !__MSDOS__ */
# ifdef __CYGWIN__
#  define DEFAULT_TMPDIR	"/tmp/"
#  define PATH_SEP	":"
#  define STRIP_DOT_EXE	0
#  undef NULL_DEVICE
#  define NULL_DEVICE "/dev/null"
#  define PIPE_USE_FORK	1
# else  /* O_BINARY && !__CYGWIN__ */
#  ifdef __MINGW32__
#   define SET_SCREEN_SIZE_HELPER terminal_prep_terminal()
extern int kill (pid_t, int);
#  endif  /* _WIN32 */
#  define DEFAULT_TMPDIR	"c:/"
#  define PATH_SEP	";"
#  define STRIP_DOT_EXE	1
#  define PIPE_USE_FORK	0
# endif /* O_BINARY && !__CYGWIN__ */
  /* Back to any O_BINARY system.  */
# define FILENAME_CMP	mbscasecmp
# define FILENAME_CMPN	mbsncasecmp
# define FOPEN_RBIN	"rb"
# define FOPEN_WBIN	"wb"
# define HAVE_DRIVE(n)	((n)[0] && (n)[1] == ':')
# define IS_SLASH(c)	((c) == '/' || (c) == '\\')
# define HAS_SLASH(s)	(strchr ((s), '/') || strchr ((s), '\\'))
# define IS_ABSOLUTE(n)	(IS_SLASH((n)[0]) || HAVE_DRIVE(n))
# define SET_BINARY(f)  do {if (!isatty(f)) setmode(f,O_BINARY);} while(0)

#else  /* not O_BINARY, i.e., Unix */
# define SET_BINARY(f)	(void)0
# define FOPEN_RBIN	"r"
# define FOPEN_WBIN	"w"
# define IS_SLASH(c)	((c) == '/')
# define HAS_SLASH(s)	(strchr ((s), '/'))
# define HAVE_DRIVE(n)	(0)
# define IS_ABSOLUTE(n)	((n)[0] == '/')
# define FILENAME_CMP	strcmp
# define FILENAME_CMPN	strncmp
# define HAVE_LONG_FILENAMES(dir)   (1)
# define PATH_SEP	":"
# define STRIP_DOT_EXE	0
# ifdef VMS
#  define DEFAULT_TMPDIR "sys$scratch:"
# else
#  define DEFAULT_TMPDIR "/tmp/"
# endif
# define NULL_DEVICE	"/dev/null"
# define PIPE_USE_FORK	1
#endif /* not O_BINARY */

#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
/* Some systems don't declare this function in pwd.h. */
struct passwd *getpwnam (const char *name);

/* Our library routines not included in any system library.  */
extern void xexit (int);

/* For convenience.  */
#define STREQ(s1,s2) (strcmp (s1, s2) == 0)
#define STRCASEEQ(s1,s2) (strcasecmp (s1, s2) == 0)
#define STRNCASEEQ(s1,s2,n) (strncasecmp (s1, s2, n) == 0)

/* We don't need anything fancy.  If we did need something fancy, gnulib
   has it.  */
#ifdef MIN
#undef MIN
#endif
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#ifdef MAX
#undef MAX
#endif
#define MAX(a,b) ((a) > (b) ? (a) : (b))

#ifndef TEXINFO_PRINTFLIKE
# ifdef __GNUC__
#  define TEXINFO_PRINTFLIKE(fmt,narg) __attribute__ ((__format__ (__printf__, fmt, narg)))
# else
#  define TEXINFO_PRINTFLIKE(fmt,narg)
# endif
#endif
			     
#endif /* TEXINFO_SYSTEM_H */