FreeBSD/Linux Kernel Cross Reference
sys/include/ansi.h
1 /* The <ansi.h> header attempts to decide whether the compiler has enough
2 * conformance to Standard C for Minix to take advantage of. If so, the
3 * symbol _ANSI is defined (as 31459). Otherwise _ANSI is not defined
4 * here, but it may be defined by applications that want to bend the rules.
5 * The magic number in the definition is to inhibit unnecessary bending
6 * of the rules. (For consistency with the new '#ifdef _ANSI" tests in
7 * the headers, _ANSI should really be defined as nothing, but that would
8 * break many library routines that use "#if _ANSI".)
9
10 * If _ANSI ends up being defined, a macro
11 *
12 * _PROTOTYPE(function, params)
13 *
14 * is defined. This macro expands in different ways, generating either
15 * ANSI Standard C prototypes or old-style K&R (Kernighan & Ritchie)
16 * prototypes, as needed. Finally, some programs use _CONST, _VOIDSTAR etc
17 * in such a way that they are portable over both ANSI and K&R compilers.
18 * The appropriate macros are defined here.
19 */
20
21 #ifndef _ANSI_H
22 #define _ANSI_H
23
24 #if __STDC__ == 1
25 #define _ANSI 31459 /* compiler claims full ANSI conformance */
26 #endif
27
28 #ifdef __GNUC__
29 #define _ANSI 31459 /* gcc conforms enough even in non-ANSI mode */
30 #endif
31
32 #ifdef _ANSI
33
34 /* Keep everything for ANSI prototypes. */
35 #define _PROTOTYPE(function, params) function params
36 #define _ARGS(params) params
37
38 #define _VOIDSTAR void *
39 #define _VOID void
40 #define _CONST const
41 #define _VOLATILE volatile
42 #define _SIZET size_t
43
44 #else
45
46 /* Throw away the parameters for K&R prototypes. */
47 #define _PROTOTYPE(function, params) function()
48 #define _ARGS(params) ()
49
50 #define _VOIDSTAR void *
51 #define _VOID void
52 #define _CONST
53 #define _VOLATILE
54 #define _SIZET int
55
56 #endif /* _ANSI */
57
58 /* This should be defined as restrict when a C99 compiler is used. */
59 #define _RESTRICT
60
61 /* Setting any of _MINIX, _POSIX_C_SOURCE or _POSIX2_SOURCE implies
62 * _POSIX_SOURCE. (Seems wrong to put this here in ANSI space.)
63 */
64 #if defined(_MINIX) || _POSIX_C_SOURCE > 0 || defined(_POSIX2_SOURCE)
65 #undef _POSIX_SOURCE
66 #define _POSIX_SOURCE 1
67 #endif
68
69 #endif /* ANSI_H */
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