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The C and C++ Include Header Files

cat -n /usr/include/python3.12/internal/pycore_dtoa.h

     1	#ifndef Py_INTERNAL_DTOA_H
     2	#define Py_INTERNAL_DTOA_H
     3	#ifdef __cplusplus
     4	extern "C" {
     5	#endif
     6	
     7	#ifndef Py_BUILD_CORE
     8	#  error "this header requires Py_BUILD_CORE define"
     9	#endif
    10	
    11	#include "pycore_pymath.h"        // _PY_SHORT_FLOAT_REPR
    12	
    13	
    14	typedef uint32_t ULong;
    15	
    16	struct
    17	Bigint {
    18	    struct Bigint *next;
    19	    int k, maxwds, sign, wds;
    20	    ULong x[1];
    21	};
    22	
    23	#if defined(Py_USING_MEMORY_DEBUGGER) || _PY_SHORT_FLOAT_REPR == 0
    24	
    25	struct _dtoa_state {
    26	    int _not_used;
    27	};
    28	#define _dtoa_state_INIT(INTERP) \
    29	    {0}
    30	
    31	#else  // !Py_USING_MEMORY_DEBUGGER && _PY_SHORT_FLOAT_REPR != 0
    32	
    33	/* The size of the Bigint freelist */
    34	#define Bigint_Kmax 7
    35	
    36	#ifndef PRIVATE_MEM
    37	#define PRIVATE_MEM 2304
    38	#endif
    39	#define Bigint_PREALLOC_SIZE \
    40	    ((PRIVATE_MEM+sizeof(double)-1)/sizeof(double))
    41	
    42	struct _dtoa_state {
    43	    /* p5s is a linked list of powers of 5 of the form 5**(2**i), i >= 2 */
    44	    // XXX This should be freed during runtime fini.
    45	    struct Bigint *p5s;
    46	    struct Bigint *freelist[Bigint_Kmax+1];
    47	    double preallocated[Bigint_PREALLOC_SIZE];
    48	    double *preallocated_next;
    49	};
    50	#define _dtoa_state_INIT(INTERP) \
    51	    { \
    52	        .preallocated_next = (INTERP)->dtoa.preallocated, \
    53	    }
    54	
    55	#endif  // !Py_USING_MEMORY_DEBUGGER
    56	
    57	
    58	/* These functions are used by modules compiled as C extension like math:
    59	   they must be exported. */
    60	
    61	PyAPI_FUNC(double) _Py_dg_strtod(const char *str, char **ptr);
    62	PyAPI_FUNC(char *) _Py_dg_dtoa(double d, int mode, int ndigits,
    63	                        int *decpt, int *sign, char **rve);
    64	PyAPI_FUNC(void) _Py_dg_freedtoa(char *s);
    65	
    66	#ifdef __cplusplus
    67	}
    68	#endif
    69	#endif /* !Py_INTERNAL_DTOA_H */