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#ifndef GENERIC_H
#define GENERIC_H 1
#include <float.h>
#include <stdio.h>
#include "c23-fallback.h"
#if !__has_va_opt
# error "no __VA_OPT__ support found, aborting compilation"
// shut off some subsequent error messages
# include "no __VA_OPT__ support found, aborting compilation"
#endif
/**
** @brief Type-generic minimum for floating-point values
**/
#define min(A, B) \
_Generic((A)+(B), \
float: minf, \
long double: minl, \
default: mind)((A), (B))
static inline
double mind(double a, double b) [[__unsequenced__]] {
return a < b ? a : b;
}
static inline
long double minl(long double a, long double b) [[__unsequenced__]] {
return a < b ? a : b;
}
static inline
float minf(float a, float b) [[__unsequenced__]] {
return a < b ? a : b;
}
/**
** @brief The maximum value for the type of @a X
**/
#define MAXVAL(X) \
_Generic((X), \
bool: (bool)+1, \
char: (char)+CHAR_MAX, \
signed char: (signed char)+SCHAR_MAX, \
unsigned char: (unsigned char)+UCHAR_MAX, \
signed short: (signed short)+SHRT_MAX, \
unsigned short: (unsigned short)+USHRT_MAX, \
signed: INT_MAX, \
unsigned: UINT_MAX, \
signed long: LONG_MAX, \
unsigned long: ULONG_MAX, \
signed long long: LLONG_MAX, \
unsigned long long: ULLONG_MAX, \
float: FLT_MAX, \
double: DBL_MAX, \
long double: LDBL_MAX)
/**
** @brief The maximum promoted value for @a XT, where @a XT
** can be an expression or a type name
**
** So this is the maximum value when fed to an arithmetic
** operation such as @c +.
**
** @remark Narrow types are promoted, usually to @c signed,
** or maybe to @c unsigned on rare architectures.
**/
#define maxof(XT) \
_Generic(0+(XT)+0, \
signed: INT_MAX, \
unsigned: UINT_MAX, \
signed long: LONG_MAX, \
unsigned long: ULONG_MAX, \
signed long long: LLONG_MAX, \
unsigned long long: ULLONG_MAX, \
float: FLT_MAX, \
double: DBL_MAX, \
long double: LDBL_MAX)
#define MINVAL(X) \
_Generic((X), \
bool: (bool)+0, \
char: (char)+CHAR_MIN, \
signed char: (signed char)+SCHAR_MIN, \
unsigned char: (unsigned char)+0, \
signed short: (signed short)+SHRT_MIN, \
unsigned short: (unsigned short)+0, \
signed: INT_MIN, \
unsigned: 0U, \
signed long: LONG_MIN, \
unsigned long: 0UL, \
signed long long: LLONG_MIN, \
unsigned long long: 0ULL, \
float: -FLT_MAX, \
double: -DBL_MAX, \
long double: -LDBL_MAX)
#define minof(XT) \
_Generic(0+(XT)+0, \
signed: INT_MIN, \
unsigned: 0U, \
signed long: LONG_MIN, \
unsigned long: 0UL, \
signed long long: LLONG_MIN, \
unsigned long long: 0ULL, \
float: -FLT_MAX, \
double: -DBL_MAX, \
long double: -LDBL_MAX)
#define strtod(NPTR, ...) \
STRTOD_I __VA_OPT__(I) (NPTR __VA_OPT__(,) __VA_ARGS__)
#define STRTOD_I(NPTR) strtod(NPTR, nullptr)
#define STRTOD_II(NPTR, ENDPTR) strtod(NPTR, ENDPTR)
#define strtof(NPTR, ...) \
STRTOF_I __VA_OPT__(I) (NPTR __VA_OPT__(,) __VA_ARGS__)
#define STRTOF_I(NPTR) strtof(NPTR, nullptr)
#define STRTOF_II(NPTR, ENDPTR) strtof(NPTR, ENDPTR)
#define strtold(NPTR, ...) \
STRTOLD_I __VA_OPT__(I) (NPTR __VA_OPT__(,) __VA_ARGS__)
#define STRTOLD_I(NPTR) strtold(NPTR, nullptr)
#define STRTOLD_II(NPTR, ENDPTR) strtold(NPTR, ENDPTR)
/** @brief Output the second argument, if any, or `DEF0` as a default.
**
** Error if more than two arguments are given.
**/
#define DEFAULT1(DEF0, ...) \
ID_I ## __VA_OPT__(Iplus_DEFAULT) \
(DEF0 __VA_OPT__(,) __VA_ARGS__)
#define ID_IIplus_DEFAULT(_01, ...) ID_I(__VA_ARGS__)
#define ID_()
#define ID_I(_01) _01
#define ID_II(_01, _2) _01, _2
#define ID_III(_01, _2, _3) _01, _2, _3
/** @brief Output comma-separated arguments from the third position
** onward, fill with defaults from the first two.
**
** Error if more than four arguments are given.
**/
#define DEFAULT2(DEF0, DEF1, ...) \
ID_II ## __VA_OPT__(Iplus_DEFAULT) \
(DEF0, DEF1 __VA_OPT__(,) __VA_ARGS__)
#define ID_IIIplus_DEFAULT(DEF0, DEF1, _01, ...) \
DEFAULT1(DEF0, _01), DEFAULT1(DEF1, __VA_ARGS__)
/** @brief Output comma-separated arguments from the fourth position
** onward, fill with defaults from the first three.
**
** Error if more than six arguments are given.
**/
#define DEFAULT3(DEF0, DEF1, DEF2, ...) \
ID_III ## __VA_OPT__(Iplus_DEFAULT) \
(DEF0, DEF1, DEF2 __VA_OPT__(,) __VA_ARGS__)
#define ID_IIIIplus_DEFAULT(DEF0, DEF1, DEF2, _01, ...) \
DEFAULT1(DEF0, _01), DEFAULT2(DEF1, DEF2, __VA_ARGS__)
#define CALL1(FUNC, DEF0, ...) \
FUNC(DEFAULT1(DEF0, __VA_ARGS__))
#define CALL2(FUNC, DEF0, DEF1, ...) \
FUNC(DEFAULT2(DEF0, DEF1, __VA_ARGS__))
#define CALL3(FUNC, DEF0, DEF1, DEF2, ...) \
FUNC(DEFAULT3(DEF0, DEF1, DEF2, __VA_ARGS__))
#define strtoul(...) \
CALL3(strtoul, "0", nullptr, 0, __VA_ARGS__)
#define strtoull(...) \
CALL3(strtoull, "0", nullptr, 0, __VA_ARGS__)
#define strtol(...) \
CALL3(strtol, "0", nullptr, 0, __VA_ARGS__)
#define strtoll(...) \
CALL3(strtoll, "0", nullptr, 0, __VA_ARGS__)
/**
** @brief Calls a three-parameter function with default arguments set to
** specific values
**
** @see strtoull10 for an example
**/
#define strtoul10(NPTR, ...) CALL3((strtoul), "0", nullptr, 10, NPTR __VA_OPT__(,) __VA_ARGS__)
#define strtoull10(NPTR, ...) CALL3((strtoull), "0", nullptr, 10, NPTR __VA_OPT__(,) __VA_ARGS__)
#define strtol10(NPTR, ...) CALL3((strtol), "0", nullptr, 10, NPTR __VA_OPT__(,) __VA_ARGS__)
#define strtoll10(NPTR, ...) CALL3((strtoll), "0", nullptr, 10, NPTR __VA_OPT__(,) __VA_ARGS__)
#define PROMOTE(XT, A) \
_Generic(0+(XT)+0, \
signed: (signed)(A), \
unsigned: (unsigned)(A), \
signed long: (signed long)(A), \
unsigned long: (unsigned long)(A), \
signed long long: (signed long long)(A), \
unsigned long long: (unsigned long long)(A), \
float: (float)(A), \
double: (double)(A), \
long double: (long double)(A))
#define SIGNEDNESS(XT) (PROMOTE(XT, -1) < PROMOTE(XT, 0))
inline
signed maxs(signed a, signed b) [[__unsequenced__]] {
return a < b ? b : a;
}
inline
unsigned maxu(unsigned a, unsigned b) [[__unsequenced__]] {
return a < b ? b : a;
}
inline
unsigned maxus(unsigned a, signed b) [[__unsequenced__]] {
return b < 0 ? a : maxu(a, b);
}
inline
unsigned maxsu(signed a, unsigned b) [[__unsequenced__]] {
return a < 0 ? b : maxu(a, b);
}
inline
signed long maxsl(signed long a, signed long b) [[__unsequenced__]] {
return a < b ? b : a;
}
inline
unsigned long maxul(unsigned long a, unsigned long b) [[__unsequenced__]] {
return a < b ? b : a;
}
inline
unsigned long maxusl(unsigned long a, signed long b) [[__unsequenced__]] {
return b < 0 ? a : maxul(a, b);
}
inline
unsigned long maxsul(signed long a, unsigned long b) [[__unsequenced__]] {
return a < 0 ? b : maxul(a, b);
}
inline
signed long long maxsll(signed long long a, signed long long b) [[__unsequenced__]] {
return a < b ? b : a;
}
inline
unsigned long long maxull(unsigned long long a, unsigned long long b) [[__unsequenced__]] {
return a < b ? b : a;
}
inline
unsigned long long maxusll(unsigned long long a, signed long long b) [[__unsequenced__]] {
return b < 0 ? a : maxull(a, b);
}
inline
unsigned long long maxsull(signed long long a, unsigned long long b) [[__unsequenced__]] {
return a < 0 ? b : maxull(a, b);
}
#define MAX(X, Y) \
_Generic((X)+(Y), \
signed: maxs, \
unsigned: maxu, \
signed long: maxsl, \
unsigned long: maxul, \
signed long long: maxsll, \
unsigned long long: maxull)((X), (Y))
#define MAXUS(X, Y) \
_Generic((X)+(Y), \
signed: maxus, \
unsigned: maxus, \
signed long: maxusl, \
unsigned long: maxusl, \
signed long long: maxusll, \
unsigned long long: maxusll)((X), (Y))
#define MAXSU(X, Y) \
_Generic((X)+(Y), \
signed: maxsu, \
unsigned: maxsu, \
signed long: maxsul, \
unsigned long: maxsul, \
signed long long: maxsull, \
unsigned long long: maxsull)((X), (Y))
#define mix(X, Y) \
_Generic(&(char[SIGNEDNESS(X)-SIGNEDNESS(Y)+2]){ }, \
char(*)[1]: MAXUS((X), (Y)), \
char(*)[2]: MAX((X), (Y)), \
char(*)[3]: MAXSU((X), (Y)))
/**
** @brief Similar to `snprintf` but checks the buffer argument for
** the size.
**
** To be able to do that check, the function has the size argument
** first and then the buffer, so the buffer can be specified as array
** parameter that depends on the that size.
**/
[[maybe_unused, __gnu__::__format__(__printf__, 3, 4)]]
static inline
int snprintf_swapped(size_t n, char s[restrict static n],
char const* restrict form, ...) {
va_list ap;
va_start(ap);
int ret = vsnprintf(s, n, form, ap);
va_end(ap);
return ret;
}
/**
** @brief A type-generic interface to `snprintf` that checks arguments.
**
** We distinguish two cases. First if the first argument is `nullptr`
** the second argument is forced to `0` and the function `snprintf`
** is called. If it is not `nullptr` a function `snprintf_swapped`
** that just swaps the first two arguments is called. Because
** that function has the size argument first and then the buffer, the
** buffer can be specified as array parameter that depends on the
** that size.
**/
#define snprintf(S, N, F, ...) \
_Generic \
((S), \
nullptr_t: \
(snprintf)(nullptr, GENERIC_IF(isice(N), (N), 0), \
F __VA_OPT__(,) __VA_ARGS__), \
default: \
snprintf_swapped(_Generic((S), \
nullptr_t: 1, \
default: (N)), \
_Generic((S), \
nullptr_t: \
(char[1]){ 0 }, \
default: (S)), \
(F) __VA_OPT__(,) __VA_ARGS__))
#define pow(X, Y) \
_Generic \
( \
(void (*)(typeof((X)+(Y)+0ULL), typeof((Y)+0ULL)))nullptr, \
/* Second argument is an integer. */ \
void (*)(float, unsigned long long): pownf, \
void (*)(double, unsigned long long): pown, \
void (*)(unsigned long long, unsigned long long): pown, \
void (*)(long double, unsigned long long): pownl, \
/* Second argument is a floating point. */ \
void (*)(float, float): powf, \
void (*)(long double, float): powl, \
void (*)(long double, double): powl, \
void (*)(long double, long double): powl, \
/* Second argument is a floating-point, and first */ \
/* is double or integer. */ \
default: pow) \
((X), (Y))
#endif
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