thrieg/ft_malloc
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Thomas Rieg 2025-11-28 19:50:58 +01:00
commit 42653de246
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libft/ft_atoi.c Executable file
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: thrieg <thrieg@student.42mulhouse.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/10/14 18:37:49 by thrieg #+# #+# */
/* Updated: 2025/02/16 19:02:53 by thrieg ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
#include <errno.h>
static int ft_is_space(char c)
{
if (c == '\t' || c == '\n' || c == '\v'
|| c == '\f' || c == '\r' || c == ' ')
return (1);
else
return (0);
}
static int ft_convert_to_int(const char *str, int sign, int *overflow_flag)
{
int value;
value = 0;
while (ft_isdigit(*str))
{
if (sign == 1)
{
if (value > (INT_MAX - (*str - '0')) / 10)
if (overflow_flag)
*overflow_flag = 1;
value = value * 10 + (*str - '0');
}
else
{
if (value < (INT_MIN + (*str - '0')) / 10)
if (overflow_flag)
*overflow_flag = 1;
value = value * 10 - (*str - '0');
}
str++;
}
return (value);
}
int ft_atoi(const char *nptr, int *overflow_flag)
{
int sign;
if (overflow_flag)
*overflow_flag = 0;
while ((*nptr != '\0') && ft_is_space(*nptr))
{
nptr++;
}
sign = 1;
if ((*nptr != '\0') && (*nptr == '-' || *nptr == '+'))
{
if (*nptr == '-')
sign = -sign;
nptr++;
}
if (!ft_isdigit(*nptr))
return (0);
return (ft_convert_to_int(nptr, sign, overflow_flag));
}