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global: add overflow safe addition macros

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King Kévin 2019-03-27 18:40:16 +01:00
parent 4df0986635
commit f18d5ea850
1 changed files with 13 additions and 1 deletions
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14
global.h
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@ -15,7 +15,7 @@
/** global definitions and methods (API)
* @file global.h
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2016-2017
* @date 2016-2019
*/
#pragma once
@ -30,6 +30,18 @@
#define CAT3(x,y,z) x##y##z
/** concatenate 4 arguments */
#define CAT4(w,x,y,z) w##x##y##z
/** integer underflow/overflow safe uint8_t addition (result to min/max on underflow/overflow) */
#define ADDU8_SAFE(a,b) {__typeof__ (a) _a = (a); __typeof__ (b) _b = (b); a = (_b > 0 ? ((_a > UINT8_MAX - _b) ? UINT8_MAX : (_a + _b)) : ((_a < _b) ? 0 : (_a - _b)));}
/** integer underflow/overflow safe uint16_t addition (result to min/max on underflow/overflow) */
#define ADDU16_SAFE(a,b) {__typeof__ (a) _a = (a); __typeof__ (b) _b = (b); a = (_b > 0 ? ((_a > UINT16_MAX - _b) ? UINT16_MAX : (_a + _b)) : ((_a < _b) ? 0 : (_a - _b)));}
/** integer underflow/overflow safe uint32_t addition (result to min/max on underflow/overflow) */
#define ADDU32_SAFE(a,b) {__typeof__ (a) _a = (a); __typeof__ (b) _b = (b); a = (_b > 0 ? ((_a > UINT32_MAX - _b) ? UINT32_MAX : (_a + _b)) : ((_a < _b) ? 0 : (_a - _b)));}
/** integer underflow/overflow safe int8_t addition (result to min/max on underflow/overflow) */
#define ADDS8_SAFE(a,b) {__typeof__ (a) _a = (a); __typeof__ (b) _b = (b); a = (_b > 0 ? ((_a > INT8_MAX - _b) ? INT8_MAX : (_a + _b)) : ((_a < INT8_MAX + _b) ? INT8_MAX : (_a - _b)));}
/** integer underflow/overflow safe int16_t addition (result to min/max on underflow/overflow) */
#define ADDS16_SAFE(a,b) {__typeof__ (a) _a = (a); __typeof__ (b) _b = (b); a = (_b > 0 ? ((_a > INT16_MAX - _b) ? INT16_MAX : (_a + _b)) : ((_a < INT16_MIN + _b) ? INT16_MIN : (_a - _b)));}
/** integer underflow/overflow safe int32_t addition (result to min/max on underflow/overflow) */
#define ADDS32_SAFE(a,b) {__typeof__ (a) _a = (a); __typeof__ (b) _b = (b); a = (_b > 0 ? ((_a > UINT32_MAX - _b) ? UINT32_MAX : (_a + _b)) : ((_a < INT32_MIN + _b) ? INT32_MIN : (_a - _b)));}
/** build year as number */
#define COMPUTE_BUILD_YEAR \