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