libft/ft_atoi.c at master · menasy/libft · GitHub

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/*
 ███▄ ▄███▓▓█████  ███▄    █  ▄▄▄        ██████▓██   ██▓
▓██▒▀█▀ ██▒▓█   ▀  ██ ▀█   █ ▒████▄    ▒██    ▒ ▒██  ██▒
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▒██    ▒██ ▒▓█  ▄ ▓██▒  ▐▌██▒░██▄▄▄▄██   ▒   ██▒ ░ ▐██▓░
▒██▒   ░██▒░▒████▒▒██░   ▓██░ ▓█   ▓██▒▒██████▒▒ ░ ██▒▓░
░ ▒░   ░  ░░░ ▒░ ░░ ▒░   ▒ ▒  ▒▒   ▓▒█░▒ ▒▓▒ ▒ ░  ██▒▒▒
░  ░      ░ ░ ░  ░░ ░░   ░ ▒░  ▒   ▒▒ ░░ ░▒  ░ ░▓██ ░▒░
░      ░      ░      ░   ░ ░   ░   ▒   ░  ░  ░  ▒ ▒ ░░
       ░      ░  ░         ░       ░  ░      ░  ░ ░
                                                ░ ░*/

#include "libft.h"

int	ft_atoi(const char *str)
{
	char	*cstr;
	int		i;
	int		isaret;
	int		sayi;

	i = 0;
	sayi = 0;
	isaret = 1;
	cstr = (char *)str;
	while ((cstr[i] >= 9 && cstr[i] <= 13) || cstr[i] == ' ')
		i++;
	if (cstr[i] == '-' || cstr[i] == '+')
	{
		if (cstr[i] == '-')
			isaret *= -1;
		i++;
	}
	while (cstr[i] >= '0' && cstr[i] <= '9')
	{
		sayi = ((sayi * 10) + cstr[i] - '0');
		i++;
	}
	return (isaret * sayi);
}