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ft_substr.c
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ft_substr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_substr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: arepsa <arepsa@student.42porto.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/04/14 16:05:05 by arepsa #+# #+# */
/* Updated: 2023/04/14 16:05:07 by arepsa ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
/*Allocates with malloc and returns a substring from the string ’s’*/
/*substring begins at index ’start’ and is of max size ’len*/
/* if (len > ft_strlen(s + start)) is to check if the length of the
substring returned by the function does not exceed the length
of the substring starting from the start*/
char *ft_substr(char const *s, unsigned int start, size_t len)
{
char *res;
size_t i;
if (!s)
return (NULL);
if (len > ft_strlen(s) - start)
len = ft_strlen(s) - start;
if (start > ft_strlen(s))
len = 0;
res = (char *)malloc(sizeof(char) * (len + 1));
if (!res)
return (NULL);
i = 0;
while (i < len)
{
res[i] = s[start + i];
i++;
}
res[i] = '\0';
return (res);
}