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/*
* Copyright (C) 2024 Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*/
#ifndef __STDC_VERSION_STDCKDINT_H__
# define __STDC_VERSION_STDCKDINT_H__ 202311L
# if defined(__GNUC__) || defined(__clang__)
# define ckd_add(r, a, b) __builtin_add_overflow(a, b, r)
# define ckd_sub(r, a, b) __builtin_sub_overflow(a, b, r)
# define ckd_mul(r, a, b) __builtin_mul_overflow(a, b, r)
# else
# include <limits.h>
# define __ckd_unsigned(suffix, type, MAX) \
static inline _Bool __ckd_add_##suffix(type *r, type a, type b) \
{ \
*r = a + b; \
return ((type)(a + b)) < a; \
} \
\
static inline _Bool __ckd_sub_##suffix(type *r, type a, type b) \
{ \
*r = a - b; \
return a < b; \
} \
\
static inline _Bool __ckd_mul_##suffix(type *r, type a, type b) \
{ \
*r = a * b; \
return b > 0 && a > (MAX / b); \
}
# define __ckd_signed_common(suffix, type, MIN, MAX) \
static inline _Bool __ckd_add_##suffix(type *r, type a, type b) \
{ \
union suffix ua = { .v = a }; \
union suffix ub = { .v = b }; \
union suffix ur = { .uv = ua.uv + ub.uv }; \
*r = ur.v; \
if ((b > 0 && a > (MAX - b)) || (b < 0 && a < (MIN - b))) \
return 1; \
return 0; \
} \
\
static inline _Bool __ckd_sub_##suffix(type *r, type a, type b) \
{ \
union suffix ua = { .v = a }; \
union suffix ub = { .v = b }; \
union suffix ur = { .uv = ua.uv - ub.uv }; \
*r = ur.v; \
if ((b < 0 && a > (MAX + b)) || (b > 0 && a < (MIN + b))) \
return 1; \
return 0; \
} \
\
static inline _Bool __ckd_mul_##suffix(type *r, type a, type b) \
{ \
union suffix ua = { .v = a }; \
union suffix ub = { .v = b }; \
union suffix ur = { .uv = ua.uv * ub.uv }; \
*r = ur.v; \
if (a > 0) { \
if (b > 0) { \
if (a > (MAX / b)) return 1; \
} else if (b < 0) { \
if (b < (MIN / a)) return 1; \
} \
} else if (a < 0) { \
if (b > 0) { \
if (a < (MIN / b)) return 1; \
} else if (b < 0) { \
if (b < (MAX / a)) return 1; \
} \
} \
return 0; \
}
# define __ckd_signed(suffix, type, MIN, MAX) \
union suffix { \
unsigned type uv; \
type v; \
}; \
__ckd_signed_common(suffix, type, MIN, MAX)
# define __ckd_signed_forced(suffix, type, MIN, MAX) \
union suffix { \
unsigned type uv; \
signed type v; \
}; \
__ckd_signed_common(suffix, signed type, MIN, MAX)
# define __ckd_func(op, r, a, b) \
_Generic (*(r), \
signed char: __ckd_##op##_sc((signed char *)(r), a, b), \
short: __ckd_##op##_ss((short *)(r), a, b), \
int: __ckd_##op##_si((int *)(r), a, b), \
long: __ckd_##op##_sl((long *)(r), a, b), \
long long: __ckd_##op##_sll((long long *)(r), a, b), \
unsigned char: __ckd_##op##_uc((unsigned char *)(r), a, b), \
unsigned short: __ckd_##op##_us((unsigned short *)(r), a, b), \
unsigned int: __ckd_##op##_ui((unsigned int *)(r), a, b), \
unsigned long: __ckd_##op##_ul((unsigned long *)(r), a, b), \
unsigned long long: __ckd_##op##_ull((unsigned long long *)(r), a, b))
__ckd_unsigned(uc, unsigned char, UCHAR_MAX)
__ckd_unsigned(us, unsigned short, USHRT_MAX)
__ckd_unsigned(ui, unsigned int, UINT_MAX)
__ckd_unsigned(ul, unsigned long, ULONG_MAX)
__ckd_unsigned(ull, unsigned long long, ULLONG_MAX)
__ckd_signed_forced(sc, char, SCHAR_MIN, SCHAR_MAX)
__ckd_signed(ss, short, SHRT_MIN, SHRT_MAX)
__ckd_signed(si, int, INT_MIN, INT_MAX)
__ckd_signed(sl, long, LONG_MIN, LONG_MAX)
__ckd_signed(sll, long long, LLONG_MIN, LLONG_MAX)
# define ckd_add(r, a, b) __ckd_func(add, r, a, b)
# define ckd_sub(r, a, b) __ckd_func(sub, r, a, b)
# define ckd_mul(r, a, b) __ckd_func(mul, r, a, b)
# endif
#endif /* __STDC_VERSION_STDCKDINT_H__ */
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