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Thomas Rieg 2025-11-28 19:50:58 +01:00
commit 42653de246
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libft/ft_safe_int_math.c Normal file
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_safe_int_math.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: thrieg <thrieg@student.42mulhouse.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/11/08 11:11:17 by alier #+# #+# */
/* Updated: 2025/02/16 19:04:25 by thrieg ### ########.fr */
/* */
/* ************************************************************************** */
#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>
#include <errno.h>
/*
* Does saturate and never overflows/underflows.
* Sets `errno` to `ERANGE` if the operation would
* have caused an overflow/underflow.
*/
int safe_int_add(int a, int b)
{
if (b >= 0 && a > INT_MAX - b)
{
errno = ERANGE;
return (INT_MAX);
}
else if (b < 0 && a < INT_MIN - b)
{
errno = ERANGE;
return (INT_MIN);
}
return (a + b);
}
/*
* Does saturate and never overflows/underflows.
* Sets `errno` to `ERANGE` if the operation would
* have caused an overflow/underflow.
*/
int safe_int_sub(int a, int b)
{
if (b >= 0 && a < INT_MIN + b)
{
errno = ERANGE;
return (INT_MIN);
}
else if (b < 0 && a > INT_MAX + b)
{
errno = ERANGE;
return (INT_MAX);
}
return (a - b);
}
/*
* Does saturate and never overflows/underflows.
* Sets `errno` to `ERANGE` if the operation would
* have caused an overflow/underflow.
*/
int safe_int_mul(int a, int b)
{
if (b > 0)
{
if (a > 0 && a > INT_MAX / b)
return (errno = ERANGE, INT_MAX);
else if (a < 0 && a < INT_MIN / b)
return (errno = ERANGE, INT_MIN);
}
else if (b < 0)
{
if (a < 0 && a < INT_MAX / b)
return (errno = ERANGE, INT_MAX);
else if ((-INT_MAX > INT_MIN && b < -1) && a > INT_MIN / b)
return (errno = ERANGE, INT_MIN);
}
return (a * b);
}