nkeynes@362 | 1 | /* ANSI and traditional C compatability macros
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nkeynes@362 | 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
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nkeynes@362 | 3 | Free Software Foundation, Inc.
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nkeynes@362 | 4 | This file is part of the GNU C Library.
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nkeynes@362 | 5 |
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nkeynes@362 | 6 | This program is free software; you can redistribute it and/or modify
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nkeynes@362 | 7 | it under the terms of the GNU General Public License as published by
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nkeynes@362 | 8 | the Free Software Foundation; either version 2 of the License, or
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nkeynes@362 | 9 | (at your option) any later version.
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nkeynes@362 | 10 |
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nkeynes@362 | 11 | This program is distributed in the hope that it will be useful,
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nkeynes@362 | 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@362 | 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@362 | 14 | GNU General Public License for more details.
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nkeynes@362 | 15 |
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nkeynes@362 | 16 | You should have received a copy of the GNU General Public License
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nkeynes@362 | 17 | along with this program; if not, write to the Free Software
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nkeynes@362 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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nkeynes@362 | 19 |
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nkeynes@362 | 20 | /* ANSI and traditional C compatibility macros
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nkeynes@362 | 21 |
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nkeynes@362 | 22 | ANSI C is assumed if __STDC__ is #defined.
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nkeynes@362 | 23 |
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nkeynes@362 | 24 | Macro ANSI C definition Traditional C definition
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nkeynes@362 | 25 | ----- ---- - ---------- ----------- - ----------
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nkeynes@362 | 26 | ANSI_PROTOTYPES 1 not defined
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nkeynes@362 | 27 | PTR `void *' `char *'
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nkeynes@362 | 28 | PTRCONST `void *const' `char *'
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nkeynes@362 | 29 | LONG_DOUBLE `long double' `double'
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nkeynes@362 | 30 | const not defined `'
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nkeynes@362 | 31 | volatile not defined `'
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nkeynes@362 | 32 | signed not defined `'
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nkeynes@362 | 33 | VA_START(ap, var) va_start(ap, var) va_start(ap)
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nkeynes@362 | 34 |
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nkeynes@362 | 35 | Note that it is safe to write "void foo();" indicating a function
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nkeynes@362 | 36 | with no return value, in all K+R compilers we have been able to test.
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nkeynes@362 | 37 |
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nkeynes@362 | 38 | For declaring functions with prototypes, we also provide these:
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nkeynes@362 | 39 |
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nkeynes@362 | 40 | PARAMS ((prototype))
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nkeynes@362 | 41 | -- for functions which take a fixed number of arguments. Use this
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nkeynes@362 | 42 | when declaring the function. When defining the function, write a
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nkeynes@362 | 43 | K+R style argument list. For example:
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nkeynes@362 | 44 |
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nkeynes@362 | 45 | char *strcpy PARAMS ((char *dest, char *source));
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nkeynes@362 | 46 | ...
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nkeynes@362 | 47 | char *
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nkeynes@362 | 48 | strcpy (dest, source)
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nkeynes@362 | 49 | char *dest;
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nkeynes@362 | 50 | char *source;
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nkeynes@362 | 51 | { ... }
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nkeynes@362 | 52 |
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nkeynes@362 | 53 |
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nkeynes@362 | 54 | VPARAMS ((prototype, ...))
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nkeynes@362 | 55 | -- for functions which take a variable number of arguments. Use
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nkeynes@362 | 56 | PARAMS to declare the function, VPARAMS to define it. For example:
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nkeynes@362 | 57 |
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nkeynes@362 | 58 | int printf PARAMS ((const char *format, ...));
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nkeynes@362 | 59 | ...
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nkeynes@362 | 60 | int
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nkeynes@362 | 61 | printf VPARAMS ((const char *format, ...))
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nkeynes@362 | 62 | {
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nkeynes@362 | 63 | ...
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nkeynes@362 | 64 | }
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nkeynes@362 | 65 |
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nkeynes@362 | 66 | For writing functions which take variable numbers of arguments, we
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nkeynes@362 | 67 | also provide the VA_OPEN, VA_CLOSE, and VA_FIXEDARG macros. These
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nkeynes@362 | 68 | hide the differences between K+R <varargs.h> and C89 <stdarg.h> more
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nkeynes@362 | 69 | thoroughly than the simple VA_START() macro mentioned above.
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nkeynes@362 | 70 |
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nkeynes@362 | 71 | VA_OPEN and VA_CLOSE are used *instead of* va_start and va_end.
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nkeynes@362 | 72 | Immediately after VA_OPEN, put a sequence of VA_FIXEDARG calls
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nkeynes@362 | 73 | corresponding to the list of fixed arguments. Then use va_arg
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nkeynes@362 | 74 | normally to get the variable arguments, or pass your va_list object
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nkeynes@362 | 75 | around. You do not declare the va_list yourself; VA_OPEN does it
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nkeynes@362 | 76 | for you.
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nkeynes@362 | 77 |
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nkeynes@362 | 78 | Here is a complete example:
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nkeynes@362 | 79 |
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nkeynes@362 | 80 | int
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nkeynes@362 | 81 | printf VPARAMS ((const char *format, ...))
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nkeynes@362 | 82 | {
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nkeynes@362 | 83 | int result;
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nkeynes@362 | 84 |
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nkeynes@362 | 85 | VA_OPEN (ap, format);
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nkeynes@362 | 86 | VA_FIXEDARG (ap, const char *, format);
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nkeynes@362 | 87 |
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nkeynes@362 | 88 | result = vfprintf (stdout, format, ap);
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nkeynes@362 | 89 | VA_CLOSE (ap);
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nkeynes@362 | 90 |
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nkeynes@362 | 91 | return result;
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nkeynes@362 | 92 | }
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nkeynes@362 | 93 |
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nkeynes@362 | 94 |
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nkeynes@362 | 95 | You can declare variables either before or after the VA_OPEN,
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nkeynes@362 | 96 | VA_FIXEDARG sequence. Also, VA_OPEN and VA_CLOSE are the beginning
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nkeynes@362 | 97 | and end of a block. They must appear at the same nesting level,
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nkeynes@362 | 98 | and any variables declared after VA_OPEN go out of scope at
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nkeynes@362 | 99 | VA_CLOSE. Unfortunately, with a K+R compiler, that includes the
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nkeynes@362 | 100 | argument list. You can have multiple instances of VA_OPEN/VA_CLOSE
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nkeynes@362 | 101 | pairs in a single function in case you need to traverse the
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nkeynes@362 | 102 | argument list more than once.
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nkeynes@362 | 103 |
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nkeynes@362 | 104 | For ease of writing code which uses GCC extensions but needs to be
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nkeynes@362 | 105 | portable to other compilers, we provide the GCC_VERSION macro that
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nkeynes@362 | 106 | simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
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nkeynes@362 | 107 | wrappers around __attribute__. Also, __extension__ will be #defined
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nkeynes@362 | 108 | to nothing if it doesn't work. See below.
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nkeynes@362 | 109 |
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nkeynes@362 | 110 | This header also defines a lot of obsolete macros:
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nkeynes@362 | 111 | CONST, VOLATILE, SIGNED, PROTO, EXFUN, DEFUN, DEFUN_VOID,
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nkeynes@362 | 112 | AND, DOTS, NOARGS. Don't use them. */
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nkeynes@362 | 113 |
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nkeynes@362 | 114 | #ifndef _ANSIDECL_H
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nkeynes@362 | 115 | #define _ANSIDECL_H 1
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nkeynes@362 | 116 |
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nkeynes@362 | 117 | /* Every source file includes this file,
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nkeynes@362 | 118 | so they will all get the switch for lint. */
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nkeynes@362 | 119 | /* LINTLIBRARY */
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nkeynes@362 | 120 |
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nkeynes@362 | 121 | /* Using MACRO(x,y) in cpp #if conditionals does not work with some
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nkeynes@362 | 122 | older preprocessors. Thus we can't define something like this:
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nkeynes@362 | 123 |
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nkeynes@362 | 124 | #define HAVE_GCC_VERSION(MAJOR, MINOR) \
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nkeynes@362 | 125 | (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
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nkeynes@362 | 126 |
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nkeynes@362 | 127 | and then test "#if HAVE_GCC_VERSION(2,7)".
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nkeynes@362 | 128 |
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nkeynes@362 | 129 | So instead we use the macro below and test it against specific values. */
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nkeynes@362 | 130 |
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nkeynes@362 | 131 | /* This macro simplifies testing whether we are using gcc, and if it
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nkeynes@362 | 132 | is of a particular minimum version. (Both major & minor numbers are
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nkeynes@362 | 133 | significant.) This macro will evaluate to 0 if we are not using
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nkeynes@362 | 134 | gcc at all. */
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nkeynes@362 | 135 | #ifndef GCC_VERSION
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nkeynes@362 | 136 | #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
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nkeynes@362 | 137 | #endif /* GCC_VERSION */
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nkeynes@362 | 138 |
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nkeynes@362 | 139 | #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) || (defined(__alpha) && defined(__cplusplus))
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nkeynes@362 | 140 | /* All known AIX compilers implement these things (but don't always
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nkeynes@362 | 141 | define __STDC__). The RISC/OS MIPS compiler defines these things
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nkeynes@362 | 142 | in SVR4 mode, but does not define __STDC__. */
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nkeynes@362 | 143 | /* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
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nkeynes@362 | 144 | C++ compilers, does not define __STDC__, though it acts as if this
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nkeynes@362 | 145 | was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
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nkeynes@362 | 146 |
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nkeynes@362 | 147 | #define ANSI_PROTOTYPES 1
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nkeynes@362 | 148 | #define PTR void *
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nkeynes@362 | 149 | #define PTRCONST void *const
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nkeynes@362 | 150 | #define LONG_DOUBLE long double
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nkeynes@362 | 151 |
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nkeynes@362 | 152 | /* PARAMS is often defined elsewhere (e.g. by libintl.h), so wrap it in
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nkeynes@362 | 153 | a #ifndef. */
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nkeynes@362 | 154 | #ifndef PARAMS
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nkeynes@362 | 155 | #define PARAMS(ARGS) ARGS
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nkeynes@362 | 156 | #endif
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nkeynes@362 | 157 |
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nkeynes@362 | 158 | #define VPARAMS(ARGS) ARGS
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nkeynes@362 | 159 | #define VA_START(VA_LIST, VAR) va_start(VA_LIST, VAR)
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nkeynes@362 | 160 |
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nkeynes@362 | 161 | /* variadic function helper macros */
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nkeynes@362 | 162 | /* "struct Qdmy" swallows the semicolon after VA_OPEN/VA_FIXEDARG's
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nkeynes@362 | 163 | use without inhibiting further decls and without declaring an
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nkeynes@362 | 164 | actual variable. */
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nkeynes@362 | 165 | #define VA_OPEN(AP, VAR) { va_list AP; va_start(AP, VAR); { struct Qdmy
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nkeynes@362 | 166 | #define VA_CLOSE(AP) } va_end(AP); }
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nkeynes@362 | 167 | #define VA_FIXEDARG(AP, T, N) struct Qdmy
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nkeynes@362 | 168 |
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nkeynes@362 | 169 | #undef const
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nkeynes@362 | 170 | #undef volatile
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nkeynes@362 | 171 | #undef signed
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nkeynes@362 | 172 |
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nkeynes@362 | 173 | /* inline requires special treatment; it's in C99, and GCC >=2.7 supports
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nkeynes@362 | 174 | it too, but it's not in C89. */
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nkeynes@362 | 175 | #undef inline
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nkeynes@362 | 176 | #if __STDC_VERSION__ > 199901L
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nkeynes@362 | 177 | /* it's a keyword */
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nkeynes@362 | 178 | #else
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nkeynes@362 | 179 | # if GCC_VERSION >= 2007
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nkeynes@362 | 180 | # define inline __inline__ /* __inline__ prevents -pedantic warnings */
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nkeynes@362 | 181 | # else
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nkeynes@362 | 182 | # define inline /* nothing */
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nkeynes@362 | 183 | # endif
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nkeynes@362 | 184 | #endif
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nkeynes@362 | 185 |
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nkeynes@362 | 186 | /* These are obsolete. Do not use. */
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nkeynes@362 | 187 | #ifndef IN_GCC
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nkeynes@362 | 188 | #define CONST const
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nkeynes@362 | 189 | #define VOLATILE volatile
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nkeynes@362 | 190 | #define SIGNED signed
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nkeynes@362 | 191 |
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nkeynes@362 | 192 | #define PROTO(type, name, arglist) type name arglist
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nkeynes@362 | 193 | #define EXFUN(name, proto) name proto
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nkeynes@362 | 194 | #define DEFUN(name, arglist, args) name(args)
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nkeynes@362 | 195 | #define DEFUN_VOID(name) name(void)
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nkeynes@362 | 196 | #define AND ,
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nkeynes@362 | 197 | #define DOTS , ...
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nkeynes@362 | 198 | #define NOARGS void
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nkeynes@362 | 199 | #endif /* ! IN_GCC */
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nkeynes@362 | 200 |
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nkeynes@362 | 201 | #else /* Not ANSI C. */
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nkeynes@362 | 202 |
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nkeynes@362 | 203 | #undef ANSI_PROTOTYPES
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nkeynes@362 | 204 | #define PTR char *
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nkeynes@362 | 205 | #define PTRCONST PTR
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nkeynes@362 | 206 | #define LONG_DOUBLE double
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nkeynes@362 | 207 |
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nkeynes@362 | 208 | #define PARAMS(args) ()
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nkeynes@362 | 209 | #define VPARAMS(args) (va_alist) va_dcl
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nkeynes@362 | 210 | #define VA_START(va_list, var) va_start(va_list)
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nkeynes@362 | 211 |
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nkeynes@362 | 212 | #define VA_OPEN(AP, VAR) { va_list AP; va_start(AP); { struct Qdmy
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nkeynes@362 | 213 | #define VA_CLOSE(AP) } va_end(AP); }
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nkeynes@362 | 214 | #define VA_FIXEDARG(AP, TYPE, NAME) TYPE NAME = va_arg(AP, TYPE)
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nkeynes@362 | 215 |
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nkeynes@362 | 216 | /* some systems define these in header files for non-ansi mode */
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nkeynes@362 | 217 | #undef const
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nkeynes@362 | 218 | #undef volatile
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nkeynes@362 | 219 | #undef signed
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nkeynes@362 | 220 | #undef inline
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nkeynes@362 | 221 | #define const
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nkeynes@362 | 222 | #define volatile
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nkeynes@362 | 223 | #define signed
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nkeynes@362 | 224 | #define inline
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nkeynes@362 | 225 |
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nkeynes@362 | 226 | #ifndef IN_GCC
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nkeynes@362 | 227 | #define CONST
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nkeynes@362 | 228 | #define VOLATILE
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nkeynes@362 | 229 | #define SIGNED
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nkeynes@362 | 230 |
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nkeynes@362 | 231 | #define PROTO(type, name, arglist) type name ()
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nkeynes@362 | 232 | #define EXFUN(name, proto) name()
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nkeynes@362 | 233 | #define DEFUN(name, arglist, args) name arglist args;
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nkeynes@362 | 234 | #define DEFUN_VOID(name) name()
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nkeynes@362 | 235 | #define AND ;
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nkeynes@362 | 236 | #define DOTS
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nkeynes@362 | 237 | #define NOARGS
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nkeynes@362 | 238 | #endif /* ! IN_GCC */
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nkeynes@362 | 239 |
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nkeynes@362 | 240 | #endif /* ANSI C. */
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nkeynes@362 | 241 |
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nkeynes@362 | 242 | /* Define macros for some gcc attributes. This permits us to use the
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nkeynes@362 | 243 | macros freely, and know that they will come into play for the
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nkeynes@362 | 244 | version of gcc in which they are supported. */
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nkeynes@362 | 245 |
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nkeynes@362 | 246 | #if (GCC_VERSION < 2007)
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nkeynes@362 | 247 | # define __attribute__(x)
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nkeynes@362 | 248 | #endif
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nkeynes@362 | 249 |
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nkeynes@362 | 250 | /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
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nkeynes@362 | 251 | #ifndef ATTRIBUTE_MALLOC
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nkeynes@362 | 252 | # if (GCC_VERSION >= 2096)
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nkeynes@362 | 253 | # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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nkeynes@362 | 254 | # else
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nkeynes@362 | 255 | # define ATTRIBUTE_MALLOC
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nkeynes@362 | 256 | # endif /* GNUC >= 2.96 */
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nkeynes@362 | 257 | #endif /* ATTRIBUTE_MALLOC */
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nkeynes@362 | 258 |
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nkeynes@362 | 259 | /* Attributes on labels were valid as of gcc 2.93. */
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nkeynes@362 | 260 | #ifndef ATTRIBUTE_UNUSED_LABEL
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nkeynes@362 | 261 | # if (GCC_VERSION >= 2093)
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nkeynes@362 | 262 | # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
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nkeynes@362 | 263 | # else
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nkeynes@362 | 264 | # define ATTRIBUTE_UNUSED_LABEL
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nkeynes@362 | 265 | # endif /* GNUC >= 2.93 */
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nkeynes@362 | 266 | #endif /* ATTRIBUTE_UNUSED_LABEL */
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nkeynes@362 | 267 |
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nkeynes@362 | 268 | #ifndef ATTRIBUTE_UNUSED
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nkeynes@362 | 269 | #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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nkeynes@362 | 270 | #endif /* ATTRIBUTE_UNUSED */
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nkeynes@362 | 271 |
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nkeynes@362 | 272 | /* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
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nkeynes@362 | 273 | identifier name. */
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nkeynes@362 | 274 | #if ! defined(__cplusplus) || (GCC_VERSION >= 3004)
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nkeynes@362 | 275 | # define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED
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nkeynes@362 | 276 | #else /* !__cplusplus || GNUC >= 3.4 */
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nkeynes@362 | 277 | # define ARG_UNUSED(NAME) NAME
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nkeynes@362 | 278 | #endif /* !__cplusplus || GNUC >= 3.4 */
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nkeynes@362 | 279 |
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nkeynes@362 | 280 | #ifndef ATTRIBUTE_NORETURN
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nkeynes@362 | 281 | #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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nkeynes@362 | 282 | #endif /* ATTRIBUTE_NORETURN */
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nkeynes@362 | 283 |
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nkeynes@362 | 284 | /* Attribute `nonnull' was valid as of gcc 3.3. */
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nkeynes@362 | 285 | #ifndef ATTRIBUTE_NONNULL
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nkeynes@362 | 286 | # if (GCC_VERSION >= 3003)
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nkeynes@362 | 287 | # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
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nkeynes@362 | 288 | # else
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nkeynes@362 | 289 | # define ATTRIBUTE_NONNULL(m)
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nkeynes@362 | 290 | # endif /* GNUC >= 3.3 */
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nkeynes@362 | 291 | #endif /* ATTRIBUTE_NONNULL */
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nkeynes@362 | 292 |
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nkeynes@362 | 293 | /* Attribute `pure' was valid as of gcc 3.0. */
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nkeynes@362 | 294 | #ifndef ATTRIBUTE_PURE
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nkeynes@362 | 295 | # if (GCC_VERSION >= 3000)
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nkeynes@362 | 296 | # define ATTRIBUTE_PURE __attribute__ ((__pure__))
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nkeynes@362 | 297 | # else
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nkeynes@362 | 298 | # define ATTRIBUTE_PURE
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nkeynes@362 | 299 | # endif /* GNUC >= 3.0 */
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nkeynes@362 | 300 | #endif /* ATTRIBUTE_PURE */
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nkeynes@362 | 301 |
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nkeynes@362 | 302 | /* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
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nkeynes@362 | 303 | This was the case for the `printf' format attribute by itself
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nkeynes@362 | 304 | before GCC 3.3, but as of 3.3 we need to add the `nonnull'
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nkeynes@362 | 305 | attribute to retain this behavior. */
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nkeynes@362 | 306 | #ifndef ATTRIBUTE_PRINTF
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nkeynes@362 | 307 | #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
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nkeynes@362 | 308 | #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
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nkeynes@362 | 309 | #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
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nkeynes@362 | 310 | #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
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nkeynes@362 | 311 | #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
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nkeynes@362 | 312 | #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
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nkeynes@362 | 313 | #endif /* ATTRIBUTE_PRINTF */
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nkeynes@362 | 314 |
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nkeynes@362 | 315 | /* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A
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nkeynes@362 | 316 | NULL format specifier was allowed as of gcc 3.3. */
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nkeynes@362 | 317 | #ifndef ATTRIBUTE_NULL_PRINTF
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nkeynes@362 | 318 | # if (GCC_VERSION >= 3003)
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nkeynes@362 | 319 | # define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
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nkeynes@362 | 320 | # else
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nkeynes@362 | 321 | # define ATTRIBUTE_NULL_PRINTF(m, n)
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nkeynes@362 | 322 | # endif /* GNUC >= 3.3 */
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nkeynes@362 | 323 | # define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
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nkeynes@362 | 324 | # define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
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nkeynes@362 | 325 | # define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
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nkeynes@362 | 326 | # define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
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nkeynes@362 | 327 | # define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
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nkeynes@362 | 328 | #endif /* ATTRIBUTE_NULL_PRINTF */
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nkeynes@362 | 329 |
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nkeynes@362 | 330 | /* Attribute `sentinel' was valid as of gcc 3.5. */
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nkeynes@362 | 331 | #ifndef ATTRIBUTE_SENTINEL
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nkeynes@362 | 332 | # if (GCC_VERSION >= 3005)
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nkeynes@362 | 333 | # define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__))
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nkeynes@362 | 334 | # else
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nkeynes@362 | 335 | # define ATTRIBUTE_SENTINEL
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nkeynes@362 | 336 | # endif /* GNUC >= 3.5 */
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nkeynes@362 | 337 | #endif /* ATTRIBUTE_SENTINEL */
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nkeynes@362 | 338 |
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nkeynes@362 | 339 | /* We use __extension__ in some places to suppress -pedantic warnings
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nkeynes@362 | 340 | about GCC extensions. This feature didn't work properly before
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nkeynes@362 | 341 | gcc 2.8. */
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nkeynes@362 | 342 | #if GCC_VERSION < 2008
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nkeynes@362 | 343 | #define __extension__
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nkeynes@362 | 344 | #endif
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nkeynes@362 | 345 |
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nkeynes@362 | 346 | #endif /* ansidecl.h */
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