3 /* Internal PDCLib configuration <_PDCLIB_config.h>
6 This file is part of the Public Domain C Library (PDCLib).
7 Permission is granted to use, modify, and / or redistribute at will.
10 /* -------------------------------------------------------------------------- */
12 /* -------------------------------------------------------------------------- */
13 /* Assuming 8-bit char, two's-complement architecture here, 'short' being */
14 /* either 8 or 16 bit, 'int' being either 16, 32 or 64 bit, 'long' being */
15 /* either 32 or 64 bit, and 'long long' being 64 bit if 'long' is not, 64 or */
16 /* 128 bit otherwise. */
17 /* Author is quite willing to support other systems but would like to hear of */
18 /* interest in such support and details on the to-be-supported architecture */
19 /* first before going to lengths about it. */
20 /* -------------------------------------------------------------------------- */
22 /* Comment out (or delete) the line below if your 'char' type is unsigned. */
23 #define _PDCLIB_CHAR_SIGNED _PDCLIB_CHAR_SIGNED
25 /* Width of the integer types short, int, long, and long long, in bytes. */
26 #define _PDCLIB_SHRT_BYTES 2
27 #define _PDCLIB_INT_BYTES 4
28 #define _PDCLIB_LONG_BYTES 4
29 #define _PDCLIB_LLONG_BYTES 8
31 /* -------------------------------------------------------------------------- */
32 /* <stdint.h> defines a set of integer types that are of a minimum width, and */
33 /* "usually fastest" on the system. (If, for example, accessing a single char */
34 /* requires the CPU to access a complete int and then mask out the char, the */
35 /* "usually fastest" type of at least 8 bits would be int, not char.) */
36 /* If you do not have information on the relative performance of the types, */
37 /* the standard allows you to define any type that meets minimum width and */
38 /* signedness requirements. */
39 /* The defines below are just configuration for the real typedefs and limit */
40 /* definitions done in <_PDCLIB_int.h>. The uppercase define shall be either */
41 /* SHRT, INT, LONG, or LLONG (telling which values to use for the *_MIN and */
42 /* *_MAX limits); the lowercase define either short, int, long, or long long */
43 /* (telling the actual type to use). */
44 /* If you require a non-standard datatype to define the "usually fastest" */
45 /* types, PDCLib as-is doesn't support that. Please contact the author with */
46 /* details on your platform in that case, so support can be added. */
47 /* -------------------------------------------------------------------------- */
49 #define _PDCLIB_FAST8 INT
50 #define _PDCLIB_fast8 int
52 #define _PDCLIB_FAST16 INT
53 #define _PDCLIB_fast16 int
55 #define _PDCLIB_FAST32 INT
56 #define _PDCLIB_fast32 int
58 #define _PDCLIB_FAST64 LLONG
59 #define _PDCLIB_fast64 long long
61 /* -------------------------------------------------------------------------- */
62 /* What follows are a couple of "special" typedefs and their limits. Again, */
63 /* the actual definition of the limits is done in <_PDCLIB_int.h>, and the */
64 /* defines here are merely "configuration". */
65 /* Type is defined directly, limits are defined the same way as the "fastest" */
66 /* limits above (SHRT, USHRT, INT, UINT, LONG, ULONG, LLONG, or ULLONG). */
67 /* -------------------------------------------------------------------------- */
69 /* The result type of substracting two pointers */
70 typedef int _PDCLIB_ptrdiff_t;
71 #define _PDCLIB_PTRDIFF INT
73 /* An integer type that can be accessed as atomic entity (think asynchronous
74 interrupts). The type itself is not defined in a freestanding environment,
75 but its limits are. (Don't ask.)
77 #define _PDCLIB_SIG_ATOMIC INT
79 /* Result type of the 'sizeof' operator */
80 #define _PDCLIB_SIZE UINT
81 typedef unsigned int _PDCLIB_size_t;
83 /* Large enough an integer to hold all character codes of the largest supported
86 #define _PDCLIB_WCHAR USHRT
87 typedef unsigned short _PDCLIB_wchar_t;
89 /* -------------------------------------------------------------------------- */
91 /* -------------------------------------------------------------------------- */
93 /* Whether the implementation rounds toward zero (0), to nearest (1), toward
94 positive infinity (2), or toward negative infinity (3). (-1) signifies
95 indeterminable rounding, any other value implementation-specific rounding.
97 #define _PDCLIB_FLT_ROUNDS -1
99 /* Whether the implementation uses exact-width precision (0), promotes float
100 to double (1), or promotes float and double to long double (2). (-1)
101 signifies indeterminable behaviour, any other value implementation-specific
104 #define _PDCLIB_FLT_EVAL_METHOD -1
106 /* "Number of the decimal digits (n), such that any floating-point number in the
107 widest supported floating type with p(max) radix (b) digits can be rounded to
108 a floating-point number with (n) decimal digits and back again without change
109 to the value p(max) log(10)b if (b) is a power of 10, [1 + p(max) log(10)b]
111 64bit IEC 60559 double format (53bit mantissa) is DECIMAL_DIG 17.
112 80bit IEC 60559 double-extended format (64bit mantissa) is DECIMAL_DIG 21.
114 #define _PDCLIB_DECIMAL_DIG 17
116 /* -------------------------------------------------------------------------- */
117 /* Platform-dependent macros defined by the standard headers. */
118 /* -------------------------------------------------------------------------- */
120 /* The offsetof macro
121 Contract: Expand to an integer constant expression of type size_t, which
122 represents the offset in bytes to the structure member from the beginning
123 of the structure. If the specified member is a bitfield, behaviour is
125 There is no standard-compliant way to do this.
126 This implementation casts an integer zero to 'pointer to type', and then
127 takes the address of member. This is undefined behaviour but should work on
130 #define _PDCLIB_offsetof( type, member ) ( (size_t) &( ( (type *) 0 )->member ) )
132 /* Variable Length Parameter List Handling (<stdarg.h>)
133 The macros defined by <stdarg.h> are highly dependent on the calling
134 conventions used, and you probably have to replace them with builtins of
135 your compiler. The following generic implementation works only for pure
136 stack-based architectures, and only if arguments are aligned to pointer
137 type. Credits to Michael Moody, who contributed this to the Public Domain.
140 /* Internal helper macro. va_round is not part of <stdarg.h>. */
141 #define _PDCLIB_va_round( type ) ( (sizeof(type) + sizeof(void *) - 1) & ~(sizeof(void *) - 1) )
143 typedef char * _PDCLIB_va_list;
144 #define _PDCLIB_va_arg( ap, type ) ( (ap) += (_PDCLIB_va_round(type)), ( *(type*) ( (ap) - (_PDCLIB_va_round(type)) ) ) )
145 #define _PDCLIB_va_copy( dest, src ) ( (dest) = (src), (void)0 )
146 #define _PDCLIB_va_end( ap ) ( (ap) = (void *)0, (void)0 )
147 #define _PDCLIB_va_start( ap, parmN ) ( (ap) = (char *) &parmN + ( _PDCLIB_va_round(parmN) ), (void)0 )