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+/* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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+ Written by Bruno Haible <haible@clisp.cons.org>, 2001.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2, or (at your option)
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+ any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program; if not, write to the Free Software Foundation,
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+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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+
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+#ifndef _STDBOOL_H
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+#define _STDBOOL_H
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+
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+/* ISO C 99 <stdbool.h> for platforms that lack it. */
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+
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+/* Usage suggestions:
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+
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+ Programs that use <stdbool.h> should be aware of some limitations
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+ and standards compliance issues.
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+
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+ Standards compliance:
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+
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+ - <stdbool.h> must be #included before 'bool', 'false', 'true'
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+ can be used.
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+
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+ - You cannot assume that sizeof (bool) == 1.
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+
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+ - Programs should not undefine the macros bool, true, and false,
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+ as C99 lists that as an "obsolescent feature".
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+
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+ Limitations of this substitute, when used in a C89 environment:
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+
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+ - <stdbool.h> must be #included before the '_Bool' type can be used.
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+
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+ - You cannot assume that _Bool is a typedef; it might be a macro.
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+
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+ - In C99, casts and automatic conversions to '_Bool' or 'bool' are
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+ performed in such a way that every nonzero value gets converted
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+ to 'true', and zero gets converted to 'false'. This doesn't work
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+ with this substitute. With this substitute, only the values 0 and 1
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+ give the expected result when converted to _Bool' or 'bool'.
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+
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+ Also, it is suggested that programs use 'bool' rather than '_Bool';
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+ this isn't required, but 'bool' is more common. */
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+
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+
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+/* 7.16. Boolean type and values */
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+
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+/* BeOS <sys/socket.h> already #defines false 0, true 1. We use the same
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+ definitions below, but temporarily we have to #undef them. */
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+#ifdef __BEOS__
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+# include <OS.h> /* defines bool but not _Bool */
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+# undef false
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+# undef true
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+#endif
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+
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+/* For the sake of symbolic names in gdb, we define true and false as
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+ enum constants, not only as macros.
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+ It is tempting to write
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+ typedef enum { false = 0, true = 1 } _Bool;
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+ so that gdb prints values of type 'bool' symbolically. But if we do
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+ this, values of type '_Bool' may promote to 'int' or 'unsigned int'
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+ (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int'
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+ (see ISO C 99 6.3.1.1.(2)). So we add a negative value to the
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+ enum; this ensures that '_Bool' promotes to 'int'. */
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+#if !(defined __cplusplus || defined __BEOS__)
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+# if !@HAVE__BOOL@
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+# if defined __SUNPRO_C && (__SUNPRO_C < 0x550 || __STDC__ == 1)
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+ /* Avoid stupid "warning: _Bool is a keyword in ISO C99". */
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+# define _Bool signed char
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+enum { false = 0, true = 1 };
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+# else
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+typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool;
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+# endif
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+# endif
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+#else
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+typedef bool _Bool;
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+#endif
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+#define bool _Bool
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+
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+/* The other macros must be usable in preprocessor directives. */
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+#define false 0
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+#define true 1
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+#define __bool_true_false_are_defined 1
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+
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+#endif /* _STDBOOL_H */
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Ton Voon