mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-17 10:06:13 +00:00
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/* MIN, MAX macros.
|
|
Copyright (C) 1995, 1998, 2001, 2003, 2005, 2009-2019 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, 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 <https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _MINMAX_H
|
|
#define _MINMAX_H
|
|
|
|
/* Note: MIN, MAX are also defined in <sys/param.h> on some systems
|
|
(glibc, IRIX, HP-UX, OSF/1). Therefore you might get warnings about
|
|
MIN, MAX macro redefinitions on some systems; the workaround is to
|
|
#include this file as the last one among the #include list. */
|
|
|
|
/* Before we define the following symbols we get the <limits.h> file
|
|
since otherwise we get redefinitions on some systems if <limits.h> is
|
|
included after this file. Likewise for <sys/param.h>.
|
|
If more than one of these system headers define MIN and MAX, pick just
|
|
one of the headers (because the definitions most likely are the same). */
|
|
#if HAVE_MINMAX_IN_LIMITS_H
|
|
# include <limits.h>
|
|
#elif HAVE_MINMAX_IN_SYS_PARAM_H
|
|
# include <sys/param.h>
|
|
#endif
|
|
|
|
/* Note: MIN and MAX should be used with two arguments of the
|
|
same type. They might not return the minimum and maximum of their two
|
|
arguments, if the arguments have different types or have unusual
|
|
floating-point values. For example, on a typical host with 32-bit 'int',
|
|
64-bit 'long long', and 64-bit IEEE 754 'double' types:
|
|
|
|
MAX (-1, 2147483648) returns 4294967295.
|
|
MAX (9007199254740992.0, 9007199254740993) returns 9007199254740992.0.
|
|
MAX (NaN, 0.0) returns 0.0.
|
|
MAX (+0.0, -0.0) returns -0.0.
|
|
|
|
and in each case the answer is in some sense bogus. */
|
|
|
|
/* MAX(a,b) returns the maximum of A and B. */
|
|
#ifndef MAX
|
|
# define MAX(a,b) ((a) > (b) ? (a) : (b))
|
|
#endif
|
|
|
|
/* MIN(a,b) returns the minimum of A and B. */
|
|
#ifndef MIN
|
|
# define MIN(a,b) ((a) < (b) ? (a) : (b))
|
|
#endif
|
|
|
|
#endif /* _MINMAX_H */
|