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ft_substr.c
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ft_substr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_substr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: akyoshid <akyoshid@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/20 10:15:13 by akyoshid #+# #+# */
/* Updated: 2023/11/20 10:59:08 by akyoshid ### ########.fr */
/* */
/* ************************************************************************** */
// === DESCRIPTION ===
// Allocates and returns a substring from the string ’s’.
// The substring begins at index ’start’ and is of maximum size ’len’.
// === RETURN VALUE ===
// if (s == NULL) → Return NULL.
// if (strlen(s) >= start) → Return empty string.
// if (len == 0) → Return empty string.
#include "libft.h"
char *ft_substr(char const *s, unsigned int start, size_t len)
{
char *buff;
size_t s_len;
size_t sub_len;
if (s == NULL)
return (NULL);
s_len = ft_strlen(s);
if (start >= s_len)
return ((char *)ft_calloc(1, 1));
if (len > s_len - start)
sub_len = s_len - start;
else
sub_len = len;
buff = malloc((sub_len + 1) * sizeof(char));
if (buff == NULL)
return (NULL);
ft_strlcpy(buff, s + start, sub_len + 1);
return (buff);
}
// int main(void)
// {
// char str[] = "abcdef";
// printf("%s\n", ft_substr(str, 1, 1));
// printf("%s\n", ft_substr(str, 1, 4));
// printf("%s\n", ft_substr(str, 1, 5));
// printf("%s\n", ft_substr(str, 1, 6));
// printf("%s\n", ft_substr(str, 1, 10));
// printf("%s\n", ft_substr(str, 0, 6));
// printf("%s\n", ft_substr(str, 6, 6));
// printf("%s\n", ft_substr(str, 7, 6));
// printf("%s\n", ft_substr(str, 0, 0));
// printf("%s\n", ft_substr(str, 0, 42000));
// printf("%s\n", ft_substr(NULL, 0, 6));
// return (0);
// }