1 /* MIN, MAX macros.
2 Copyright (C) 1995, 1998, 2001, 2003, 2005, 2009-2023 Free Software
3 Foundation, Inc.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 This file is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 #ifndef _MINMAX_H
19 #define _MINMAX_H
20
21 /* Note: MIN, MAX are also defined in <sys/param.h> on some systems
22 (glibc, IRIX, HP-UX, OSF/1). Therefore you might get warnings about
23 MIN, MAX macro redefinitions on some systems; the workaround is to
24 #include this file as the last one among the #include list. */
25
26 /* This file uses HAVE_MINMAX_IN_LIMITS_H, HAVE_MINMAX_IN_SYS_PARAM_H. */
27 #if !_GL_CONFIG_H_INCLUDED
28 #error "Please include config.h first."
29 #endif
30
31 /* Before we define the following symbols we get the <limits.h> file
32 since otherwise we get redefinitions on some systems if <limits.h> is
33 included after this file. Likewise for <sys/param.h>.
34 If more than one of these system headers define MIN and MAX, pick just
35 one of the headers (because the definitions most likely are the same). */
36 #if HAVE_MINMAX_IN_LIMITS_H
37 # include <limits.h>
38 #elif HAVE_MINMAX_IN_SYS_PARAM_H
39 # include <sys/param.h>
40 #endif
41
42 /* Note: MIN and MAX should be used with two arguments of the
43 same type. They might not return the minimum and maximum of their two
44 arguments, if the arguments have different types or have unusual
45 floating-point values. For example, on a typical host with 32-bit 'int',
46 64-bit 'long long', and 64-bit IEEE 754 'double' types:
47
48 MAX (-1, 2147483648) returns 4294967295.
49 MAX (9007199254740992.0, 9007199254740993) returns 9007199254740992.0.
50 MAX (NaN, 0.0) returns 0.0.
51 MAX (+0.0, -0.0) returns -0.0.
52
53 and in each case the answer is in some sense bogus. */
54
55 /* MAX(a,b) returns the maximum of A and B. */
56 #ifndef MAX
57 # define MAX(a,b) ((a) > (b) ? (a) : (b))
58 #endif
59
60 /* MIN(a,b) returns the minimum of A and B. */
61 #ifndef MIN
62 # define MIN(a,b) ((a) < (b) ? (a) : (b))
63 #endif
64
65 #endif /* _MINMAX_H */