5 /* Internal PDCLib configuration <_PDCLIB_config.h>
8 This file is part of the Public Domain C Library (PDCLib).
9 Permission is granted to use, modify, and / or redistribute at will.
12 /* -------------------------------------------------------------------------- */
14 /* -------------------------------------------------------------------------- */
16 /* The character (sequence) your platform uses as newline. */
17 #define _PDCLIB_endl "\n"
19 /* -------------------------------------------------------------------------- */
21 /* -------------------------------------------------------------------------- */
22 /* Assuming 8-bit char, two's-complement architecture here. 'short' being */
23 /* 16 bit, 'int' being either 16, 32 or 64 bit, 'long' being either 32 or 64 */
24 /* bit (but 64 bit only if 'int' is 32 bit), and 'long long' being 64 bit if */
25 /* 'long' is not, 64 or 128 bit otherwise. */
26 /* Author is quite willing to support other systems but would like to hear of */
27 /* interest in such support and details on the to-be-supported architecture */
28 /* first, before going to lengths about it. */
29 /* -------------------------------------------------------------------------- */
31 /* Comment out (or delete) the line below if your 'char' type is unsigned. */
32 #define _PDCLIB_CHAR_SIGNED 1
34 /* Width of the integer types short, int, long, and long long, in bytes. */
35 /* SHRT == 2, INT >= SHRT, LONG >= INT >= 4, LLONG >= LONG - check your */
36 /* compiler manuals. */
37 #define _PDCLIB_SHRT_BYTES 2
38 #define _PDCLIB_INT_BYTES 4
39 #define _PDCLIB_LONG_BYTES 4
40 #define _PDCLIB_LLONG_BYTES 8
42 /* <stdlib.h> defines the div() function family that allows taking quotient */
43 /* and remainder of an integer division in one operation. Many platforms */
44 /* support this in hardware / opcode, and the standard permits ordering of */
45 /* the return structure in any way to fit the hardware. That is why those */
46 /* structs can be configured here. */
60 struct _PDCLIB_lldiv_t
66 /* -------------------------------------------------------------------------- */
67 /* <stdint.h> defines a set of integer types that are of a minimum width, and */
68 /* "usually fastest" on the system. (If, for example, accessing a single char */
69 /* requires the CPU to access a complete int and then mask out the char, the */
70 /* "usually fastest" type of at least 8 bits would be int, not char.) */
71 /* If you do not have information on the relative performance of the types, */
72 /* the standard allows you to define any type that meets minimum width and */
73 /* signedness requirements. */
74 /* The defines below are just configuration for the real typedefs and limit */
75 /* definitions done in <_PDCLIB_int.h>. The uppercase define shall be either */
76 /* SHRT, INT, LONG, or LLONG (telling which values to use for the *_MIN and */
77 /* *_MAX limits); the lowercase define either short, int, long, or long long */
78 /* (telling the actual type to use). */
79 /* If you require a non-standard datatype to define the "usually fastest" */
80 /* types, PDCLib as-is doesn't support that. Please contact the author with */
81 /* details on your platform in that case, so support can be added. */
82 /* -------------------------------------------------------------------------- */
84 #define _PDCLIB_FAST8 INT
85 #define _PDCLIB_fast8 int
87 #define _PDCLIB_FAST16 INT
88 #define _PDCLIB_fast16 int
90 #define _PDCLIB_FAST32 INT
91 #define _PDCLIB_fast32 int
93 #define _PDCLIB_FAST64 LLONG
94 #define _PDCLIB_fast64 long long
96 /* -------------------------------------------------------------------------- */
97 /* What follows are a couple of "special" typedefs and their limits. Again, */
98 /* the actual definition of the limits is done in <_PDCLIB_int.h>, and the */
99 /* defines here are merely "configuration". See above for details. */
100 /* -------------------------------------------------------------------------- */
102 /* The result type of substracting two pointers */
103 #define _PDCLIB_ptrdiff int
104 #define _PDCLIB_PTRDIFF INT
106 /* An integer type that can be accessed as atomic entity (think asynchronous
107 interrupts). The type itself is not defined in a freestanding environment,
108 but its limits are. (Don't ask.)
110 #define _PDCLIB_SIG_ATOMIC INT
112 /* Result type of the 'sizeof' operator */
113 #define _PDCLIB_size unsigned int
114 #define _PDCLIB_SIZE UINT
116 /* Large enough an integer to hold all character codes of the largest supported
119 #define _PDCLIB_wchar unsigned short
120 #define _PDCLIB_WCHAR USHRT
122 #define _PDCLIB_intptr int
123 #define _PDCLIB_INTPTR INT
125 /* Largest supported integer type. Implementation note: see _PDCLIB_atomax(). */
126 #define _PDCLIB_intmax long long int
127 #define _PDCLIB_INTMAX LLINT
128 /* You are also required to state the literal suffix for the intmax type */
129 #define _PDCLIB_INTMAX_LITERAL ll
131 /* -------------------------------------------------------------------------- */
133 /* -------------------------------------------------------------------------- */
135 /* Whether the implementation rounds toward zero (0), to nearest (1), toward
136 positive infinity (2), or toward negative infinity (3). (-1) signifies
137 indeterminable rounding, any other value implementation-specific rounding.
139 #define _PDCLIB_FLT_ROUNDS -1
141 /* Whether the implementation uses exact-width precision (0), promotes float
142 to double (1), or promotes float and double to long double (2). (-1)
143 signifies indeterminable behaviour, any other value implementation-specific
146 #define _PDCLIB_FLT_EVAL_METHOD -1
148 /* "Number of the decimal digits (n), such that any floating-point number in the
149 widest supported floating type with p(max) radix (b) digits can be rounded to
150 a floating-point number with (n) decimal digits and back again without change
151 to the value p(max) log(10)b if (b) is a power of 10, [1 + p(max) log(10)b]
153 64bit IEC 60559 double format (53bit mantissa) is DECIMAL_DIG 17.
154 80bit IEC 60559 double-extended format (64bit mantissa) is DECIMAL_DIG 21.
156 #define _PDCLIB_DECIMAL_DIG 17
158 /* -------------------------------------------------------------------------- */
159 /* Platform-dependent macros defined by the standard headers. */
160 /* -------------------------------------------------------------------------- */
162 /* The offsetof macro
163 Contract: Expand to an integer constant expression of type size_t, which
164 represents the offset in bytes to the structure member from the beginning
165 of the structure. If the specified member is a bitfield, behaviour is
167 There is no standard-compliant way to do this.
168 This implementation casts an integer zero to 'pointer to type', and then
169 takes the address of member. This is undefined behaviour but should work on
172 #define _PDCLIB_offsetof( type, member ) ( (size_t) &( ( (type *) 0 )->member ) )
174 /* Variable Length Parameter List Handling (<stdarg.h>)
175 The macros defined by <stdarg.h> are highly dependent on the calling
176 conventions used, and you probably have to replace them with builtins of
177 your compiler. The following generic implementation works only for pure
178 stack-based architectures, and only if arguments are aligned to pointer
179 type. Credits to Michael Moody, who contributed this to the Public Domain.
182 /* Internal helper macro. va_round is not part of <stdarg.h>. */
183 #define _PDCLIB_va_round( type ) ( (sizeof(type) + sizeof(void *) - 1) & ~(sizeof(void *) - 1) )
185 typedef char * _PDCLIB_va_list;
186 #define _PDCLIB_va_arg( ap, type ) ( (ap) += (_PDCLIB_va_round(type)), ( *(type*) ( (ap) - (_PDCLIB_va_round(type)) ) ) )
187 #define _PDCLIB_va_copy( dest, src ) ( (dest) = (src), (void)0 )
188 #define _PDCLIB_va_end( ap ) ( (ap) = (void *)0, (void)0 )
189 #define _PDCLIB_va_start( ap, parmN ) ( (ap) = (char *) &parmN + ( _PDCLIB_va_round(parmN) ), (void)0 )