joachim99@52: /* System dependent declarations.
joachim99@52: 
joachim99@52:    Modified for KDiff3 by Joachim Eibl 2003.
joachim99@53:    The original file was part of GNU DIFF.
joachim99@52: 
joachim99@52:    Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1998, 2001, 2002
joachim99@52:    Free Software Foundation, Inc.
joachim99@52: 
joachim99@52:    GNU DIFF is free software; you can redistribute it and/or modify
joachim99@52:    it under the terms of the GNU General Public License as published by
joachim99@52:    the Free Software Foundation; either version 2, or (at your option)
joachim99@52:    any later version.
joachim99@52: 
joachim99@52:    GNU DIFF is distributed in the hope that it will be useful,
joachim99@52:    but WITHOUT ANY WARRANTY; without even the implied warranty of
joachim99@52:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
joachim99@52:    GNU General Public License for more details.
joachim99@52: 
joachim99@52:    You should have received a copy of the GNU General Public License
joachim99@52:    along with this program; see the file COPYING.
joachim99@52:    If not, write to the Free Software Foundation,
joachim99@69:    51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA.  */
joachim99@52: 
joachim99@53: #ifndef GNUDIFF_SYSTEM_H
joachim99@53: #define GNUDIFF_SYSTEM_H
joachim99@53: 
joachim99@53: 
joachim99@53: 
joachim99@52: /* Don't bother to support K&R C compilers any more; it's not worth
joachim99@52:    the trouble.  These macros prevent some library modules from being
joachim99@52:    compiled in K&R C mode.  */
joachim99@52: #define PARAMS(Args) Args
joachim99@52: #define PROTOTYPES 1
joachim99@52: 
joachim99@52: /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
joachim99@52: #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
joachim99@52: 
joachim99@52: 
joachim99@52: /* Determine whether an integer type is signed, and its bounds.
joachim99@52:    This code assumes two's (or one's!) complement with no holes.  */
joachim99@52: 
joachim99@52: /* The extra casts work around common compiler bugs,
joachim99@52:    e.g. Cray C 5.0.3.0 when t == time_t.  */
joachim99@52: #ifndef TYPE_SIGNED
joachim99@52: # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
joachim99@52: #endif
joachim99@52: #ifndef TYPE_MINIMUM
joachim99@52: # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
joachim99@52: 			       ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
joachim99@52: 			       : (t) 0))
joachim99@52: #endif
joachim99@52: #ifndef TYPE_MAXIMUM
joachim99@52: # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
joachim99@52: #endif
joachim99@52: 
joachim99@52: #include <sys/types.h>
joachim99@52: #include <sys/stat.h>
joachim99@52: 
joachim99@52: 
joachim99@52: # include <stdlib.h>
joachim99@52: #ifndef EXIT_SUCCESS
joachim99@52: # define EXIT_SUCCESS 0
joachim99@52: #endif
joachim99@52: #if !EXIT_FAILURE
joachim99@52: # undef EXIT_FAILURE /* Sony NEWS-OS 4.0C defines EXIT_FAILURE to 0.  */
joachim99@52: # define EXIT_FAILURE 1
joachim99@52: #endif
joachim99@52: #define EXIT_TROUBLE 2
joachim99@52: 
joachim99@52: #include <limits.h>
joachim99@52: #ifndef SSIZE_MAX
joachim99@52: # define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
joachim99@52: #endif
joachim99@52: 
joachim99@52: #ifndef PTRDIFF_MAX
joachim99@52: # define PTRDIFF_MAX TYPE_MAXIMUM (ptrdiff_t)
joachim99@52: #endif
joachim99@52: #ifndef SIZE_MAX
joachim99@52: # define SIZE_MAX TYPE_MAXIMUM (size_t)
joachim99@52: #endif
joachim99@52: #ifndef UINTMAX_MAX
joachim99@52: # define UINTMAX_MAX TYPE_MAXIMUM (uintmax_t)
joachim99@52: #endif
joachim99@52: 
joachim99@52: #include <stddef.h>
joachim99@52: #include <string.h>
joachim99@52: #include <ctype.h>
joachim99@52: 
joachim99@52: /* CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
joachim99@52:    as an argument to <ctype.h> macros like `isspace'.  */
joachim99@52: # define CTYPE_DOMAIN(c) 1
joachim99@52: #define ISPRINT(c) (CTYPE_DOMAIN (c) && isprint (c))
joachim99@52: #define ISSPACE(c) (CTYPE_DOMAIN (c) && isspace (c))
joachim99@52: 
joachim99@52: # define TOLOWER(c) tolower (c)
joachim99@52: 
joachim99@52: /* ISDIGIT differs from isdigit, as follows:
joachim99@52:    - Its arg may be any int or unsigned int; it need not be an unsigned char.
joachim99@52:    - It's guaranteed to evaluate its argument exactly once.
joachim99@52:    - It's typically faster.
joachim99@52:    POSIX 1003.1-2001 says that only '0' through '9' are digits.
joachim99@52:    Prefer ISDIGIT to isdigit unless it's important to use the locale's
joachim99@52:    definition of `digit' even when the host does not conform to POSIX.  */
joachim99@52: #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
joachim99@52: 
joachim99@52: #undef MIN
joachim99@52: #undef MAX
joachim99@52: #define MIN(a, b) ((a) <= (b) ? (a) : (b))
joachim99@52: #define MAX(a, b) ((a) >= (b) ? (a) : (b))
joachim99@52: 
joachim99@52: 
joachim99@52: /* The integer type of a line number.  Since files are read into main
joachim99@52:    memory, ptrdiff_t should be wide enough.  */
joachim99@52: 
joachim99@52: typedef ptrdiff_t lin;
joachim99@52: #define LIN_MAX PTRDIFF_MAX
joachim99@52: verify (lin_is_signed, TYPE_SIGNED (lin));
joachim99@52: verify (lin_is_wide_enough, sizeof (ptrdiff_t) <= sizeof (lin));
joachim99@52: verify (lin_is_printable_as_long, sizeof (lin) <= sizeof (long));
joachim99@53: 
joachim99@53: #endif