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kill me pete

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shweet
2025-11-11 20:41:39 -05:00
parent a2a33e471d
commit 7ab7ed3ee2
1 changed files with 90 additions and 0 deletions
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include/stdckdint.h Normal file
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#pragma once
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#ifndef __STDC_VERSION_STDCKDINT_H__
#define __STDC_VERSION_STDCKDINT_H__ 202311L
#define __CKD_ADD_UNSIGNED(name, type) \
static inline bool ckd_add_##name(type* result, type a, type b) \
{ \
type tmp = (type)(a + b); \
*result = tmp; \
return tmp < a; \
}
#define __CKD_SUB_UNSIGNED(name, type) \
static inline bool ckd_sub_##name(type* result, type a, type b) \
{ \
*result = (type)(a - b); \
return a < b; \
}
#define __CKD_ADD_SIGNED(name, type, min_v, max_v) \
static inline bool ckd_add_##name(type* result, type a, type b) \
{ \
const type minValue = (type)(min_v); \
const type maxValue = (type)(max_v); \
const type tmp = (type)(a + b); \
*result = tmp; \
return (b > 0 && a > (type)(maxValue - b)) || (b < 0 && a < (type)(minValue - b)); \
}
#define __CKD_SUB_SIGNED(name, type, min_v, max_v) \
static inline bool ckd_sub_##name(type* result, type a, type b) \
{ \
const type minValue = (type)(min_v); \
const type maxValue = (type)(max_v); \
const type tmp = (type)(a - b); \
*result = tmp; \
return (b > 0 && a < (type)(minValue + b)) || (b < 0 && a > (type)(maxValue + b)); \
}
__CKD_ADD_UNSIGNED(u8, uint8_t)
__CKD_ADD_UNSIGNED(u16, uint16_t)
__CKD_ADD_UNSIGNED(u32, uint32_t)
__CKD_ADD_UNSIGNED(u64, uint64_t)
__CKD_ADD_UNSIGNED(usz, size_t)
__CKD_SUB_UNSIGNED(u8, uint8_t)
__CKD_SUB_UNSIGNED(u16, uint16_t)
__CKD_SUB_UNSIGNED(u32, uint32_t)
__CKD_SUB_UNSIGNED(u64, uint64_t)
__CKD_SUB_UNSIGNED(usz, size_t)
__CKD_ADD_SIGNED(i8, int8_t, INT8_MIN, INT8_MAX)
__CKD_ADD_SIGNED(i16, int16_t, INT16_MIN, INT16_MAX)
__CKD_ADD_SIGNED(i32, int32_t, INT32_MIN, INT32_MAX)
__CKD_ADD_SIGNED(i64, int64_t, INT64_MIN, INT64_MAX)
__CKD_SUB_SIGNED(i8, int8_t, INT8_MIN, INT8_MAX)
__CKD_SUB_SIGNED(i16, int16_t, INT16_MIN, INT16_MAX)
__CKD_SUB_SIGNED(i32, int32_t, INT32_MIN, INT32_MAX)
__CKD_SUB_SIGNED(i64, int64_t, INT64_MIN, INT64_MAX)
#undef __CKD_ADD_UNSIGNED
#undef __CKD_SUB_UNSIGNED
#undef __CKD_ADD_SIGNED
#undef __CKD_SUB_SIGNED
#define __CKD_DISPATCH(result, a, b, add_fn, sub_fn) \
(_Generic((result), \
uint8_t*: add_fn##_u8, \
const uint8_t*: add_fn##_u8, \
unsigned char*: add_fn##_u8, \
uint16_t*: add_fn##_u16, \
uint32_t*: add_fn##_u32, \
uint64_t*: add_fn##_u64, \
size_t*: add_fn##_usz, \
int8_t*: add_fn##_i8, \
int16_t*: add_fn##_i16, \
int32_t*: add_fn##_i32, \
int64_t*: add_fn##_i64)(result, a, b))
#define ckd_add(result, a, b) __CKD_DISPATCH(result, a, b, ckd_add, ckd_sub)
#define ckd_sub(result, a, b) __CKD_DISPATCH(result, a, b, ckd_add, ckd_sub)
#endif /* __STDC_VERSION_STDCKDINT_H__ */