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- /* The <ansi.h> header checks whether the compiler claims conformance to ANSI
- * Standard C. If so, the symbol _ANSI is defined as 1, otherwise it is
- * defined as 0. Based on the result, a macro
- *
- * _PROTOTYPE(function, params)
- *
- * is defined. This macro expands in different ways, generating either
- * ANSI Standard C prototypes or old-style K&R (Kernighan & Ritchie)
- * prototypes, as needed. Finally, some programs use _CONST, _VOIDSTAR etc
- * in such a way that they are portable over both ANSI and K&R compilers.
- * The appropriate macros are defined here.
- */
- #ifndef _ANSI_H
- #define _ANSI_H
- /* ANSI C requires __STDC__ to be defined as 1 for an ANSI C compiler.
- * Some half-ANSI compilers define it as 0. Get around this here.
- */
- #define _ANSI 0 /* 0 if compiler is not ANSI C, 1 if it is */
- #ifdef __STDC__ /* __STDC__ defined for (near) ANSI compilers*/
- #if __STDC__ == 1 /* __STDC__ == 1 for conformant compilers */
- #undef _ANSI /* get rid of above definition */
- #define _ANSI 1 /* _ANSI = 1 for ANSI C compilers */
- #endif
- #endif
- /* At this point, _ANSI has been set correctly to 0 or 1. Define the
- * _PROTOTYPE macro to either expand both of its arguments (ANSI prototypes),
- * only the function name (K&R prototypes).
- */
- #if _ANSI
- #define _PROTOTYPE(function, params) function params
- #define _VOIDSTAR void *
- #define _VOID void
- #define _CONST const
- #define _VOLATILE volatile
- #define _SIZET size_t
- #else
- #define _PROTOTYPE(function, params) function()
- #define _VOIDSTAR void *
- #define _VOID void
- #define _CONST
- #define _VOLATILE
- #define _SIZET int
- #endif /* _ANSI */
- #endif /* ANSI_H */
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