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ft_substr.c
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ft_substr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_substr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: anhigo-s <anhigo-s@student.42sp.org.br> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/08/01 16:25:56 by anhigo-s #+# #+# */
/* Updated: 2023/02/23 17:39:24 by anhigo-s ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static size_t check(const char *s, unsigned int start, size_t len);
static char *start_out_of_bounds(void);
char *ft_substr(char const *s, unsigned int start, size_t len)
{
size_t index;
char *substr;
if (!s)
return (NULL);
else if (start > ft_strlen(s))
return (start_out_of_bounds());
substr = malloc((check(s, start, len)) * sizeof(char));
if (!substr)
return (NULL);
index = 0;
while ((len--) && (s[start + index] != '\0') && \
((start + index) < ft_strlen(s)))
{
substr[index] = s[start + index];
index++;
}
substr[index] = '\0';
return (substr);
}
static size_t check(const char *s, unsigned int start, size_t len)
{
const size_t s_len = ft_strlen(s);
size_t size;
size = 0;
if (start > s_len)
{
size = 1;
}
else if (start + len > s_len)
{
size = s_len - start + 1;
}
else
{
size = len + 1;
}
return (size);
}
static char *start_out_of_bounds(void)
{
char *substr;
substr = malloc(sizeof(char));
if (!substr)
return (NULL);
substr[0] = '\0';
return (substr);
}