41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_atoi.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: tmaze <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2018/04/05 13:50:22 by tmaze #+# #+# */
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/* Updated: 2018/04/05 14:24:13 by tmaze ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "libft.h"
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int ft_atoi(const char *str)
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{
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int nbnum;
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int mult;
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int ret;
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nbnum = 0;
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while (str[nbnum] == ' ' || str[nbnum] == '\t' || str[nbnum] == '\n'\
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|| str[nbnum] == '\v' || str[nbnum] == '\f' || str[nbnum] == '\r')
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nbnum++;
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if (str[nbnum] == '+' || str[nbnum] == '-')
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nbnum++;
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while (str[nbnum] != '\0' && str[nbnum] >= '0' && str[nbnum] <= '9')
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nbnum++;
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nbnum--;
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ret = 0;
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mult = 1;
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while (nbnum >= 0 && (str[nbnum] >= '0' && str[nbnum] <= '9'))
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{
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ret += (str[nbnum--] - '0') * mult;
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mult *= 10;
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}
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if (nbnum >= 0 && str[nbnum] == '-')
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ret *= -1;
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return (ret);
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}
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