39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
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/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_isnum.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: cchauvet <cchauvet@student.42angouleme.fr +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2022/11/08 18:43:06 by cchauvet #+# #+# */
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/* Updated: 2023/01/20 17:14:08 by cchauvet ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "extra.h"
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int ft_isnum(char *str)
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{
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long int i;
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int sign;
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sign = 1;
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if (*str == '-')
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sign = -1;
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i = 0;
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if (*str == '-' || *str == '+')
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str++;
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if (*str == '\0')
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return (0);
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while (*str != '\0')
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{
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i = i * 10 + *str - '0';
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if (i * sign > INT_MAX || INT_MIN > i * sign)
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return (0);
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if (!(*str >= '0' && *str <= '9'))
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return (0);
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str++;
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}
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return (1);
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}
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