54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* The <ansi.h> header checks whether the compiler claims conformance to ANSI
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* Standard C. If so, the symbol _ANSI is defined as 1, otherwise it is
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* defined as 0. Based on the result, 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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/* ANSI C requires __STDC__ to be defined as 1 for an ANSI C compiler.
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* Some half-ANSI compilers define it as 0. Get around this here.
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*/
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#define _ANSI 0 /* 0 if compiler is not ANSI C, 1 if it is */
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#ifdef __STDC__ /* __STDC__ defined for (near) ANSI compilers*/
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#if __STDC__ == 1 /* __STDC__ == 1 for conformant compilers */
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#undef _ANSI /* get rid of above definition */
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#define _ANSI 1 /* _ANSI = 1 for ANSI C compilers */
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#endif
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#endif
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/* At this point, _ANSI has been set correctly to 0 or 1. Define the
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* _PROTOTYPE macro to either expand both of its arguments (ANSI prototypes),
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* only the function name (K&R prototypes).
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*/
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#if _ANSI
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#define _PROTOTYPE(function, params) function 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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#define _PROTOTYPE(function, params) function()
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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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#endif /* ANSI_H */
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