70 lines
2.0 KiB
C
Executable File
70 lines
2.0 KiB
C
Executable File
/* The <ansi.h> header attempts to decide whether the compiler has enough
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* conformance to Standard C for Minix to take advantage of. If so, the
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* symbol _ANSI is defined (as 31459). Otherwise _ANSI is not defined
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* here, but it may be defined by applications that want to bend the rules.
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* The magic number in the definition is to inhibit unnecessary bending
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* of the rules. (For consistency with the new '#ifdef _ANSI" tests in
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* the headers, _ANSI should really be defined as nothing, but that would
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* break many library routines that use "#if _ANSI".)
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* If _ANSI ends up being defined, a macro
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*
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* _PROTOTYPE(function, params)
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*
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* is defined. This macro expands in different ways, generating either
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* ANSI Standard C prototypes or old-style K&R (Kernighan & Ritchie)
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* prototypes, as needed. Finally, some programs use _CONST, _VOIDSTAR etc
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* in such a way that they are portable over both ANSI and K&R compilers.
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* The appropriate macros are defined here.
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*/
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#ifndef _ANSI_H
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#define _ANSI_H
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#if __STDC__ == 1
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#define _ANSI 31459 /* compiler claims full ANSI conformance */
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#endif
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#ifdef __GNUC__
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#define _ANSI 31459 /* gcc conforms enough even in non-ANSI mode */
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#endif
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#ifdef _ANSI
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/* Keep everything for ANSI prototypes. */
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#define _PROTOTYPE(function, params) function params
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#define _ARGS(params) params
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#define _VOIDSTAR void *
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#define _VOID void
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#define _CONST const
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#define _VOLATILE volatile
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#define _SIZET size_t
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#else
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/* Throw away the parameters for K&R prototypes. */
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#define _PROTOTYPE(function, params) function()
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#define _ARGS(params) ()
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#define _VOIDSTAR void *
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#define _VOID void
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#define _CONST
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#define _VOLATILE
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#define _SIZET int
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#endif /* _ANSI */
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/* This should be defined as restrict when a C99 compiler is used. */
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#define _RESTRICT
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/* Setting any of _MINIX, _POSIX_C_SOURCE or _POSIX2_SOURCE implies
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* _POSIX_SOURCE. (Seems wrong to put this here in ANSI space.)
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*/
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#if defined(_MINIX) || _POSIX_C_SOURCE > 0 || defined(_POSIX2_SOURCE)
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#undef _POSIX_SOURCE
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#define _POSIX_SOURCE 1
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#endif
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#endif /* ANSI_H */
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