87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* str_ops.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2016/08/21 18:21:01 by jhalford #+# #+# */
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/* Updated: 2016/08/21 18:23:58 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include <stdlib.h>
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#define NEG(x) (((x) < 0) ? 1 : 0)
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#define ABS(x) (((x) < 0) ? -(x) : x)
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char *ft_strrev(char *str)
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{
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int len;
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char tmp;
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int i;
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i = 0;
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len = 0;
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while (str[len] != '\0')
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len++;
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while (i < len / 2)
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{
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tmp = str[len - (i + 1)];
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str[len - (i + 1)] = str[i];
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str[i] = tmp;
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i++;
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}
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return (str);
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}
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int ft_atoi(char *str)
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{
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int i;
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int res;
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int sign;
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i = 0;
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res = 0;
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sign = 1;
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if (str[i] == '-' || str[i] == '+')
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{
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if (str[i + 1] >= '0' && str[i + 1] <= '9')
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{
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sign = (str[i] == '+') ? 1 : -1;
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i++;
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}
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else
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return (0);
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}
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while (str[i] >= '0' && str[i] <= '9')
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res = res * 10 + sign * (str[i++] - '0');
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return (res);
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}
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char *ft_itoa(int num)
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{
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int i;
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int neg;
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char *str;
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i = 0;
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str = (char *)malloc(10000);
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neg = 0;
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if (num < 0)
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neg = 1;
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if (num == 0)
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{
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str[i++] = '0';
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str[i] = '\0';
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return (str);
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}
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while (num)
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{
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str[i++] = ABS(num % 10) + '0';
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num = num / 10;
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}
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if (neg)
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str[i++] = '-';
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str[i] = '\0';
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return (ft_strrev(str));
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}
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