thrieg/ft_malloc
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Thomas Rieg 2025-11-28 19:50:58 +01:00
commit 42653de246
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libft/ft_substr.c Executable file
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_substr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: thrieg <thrieg@student.42mulhouse.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/10/15 11:27:50 by thrieg #+# #+# */
/* Updated: 2025/02/16 19:05:22 by thrieg ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static void ft_memcpy_with_nullchar(char *substring, char const *s, size_t len)
{
ft_memcpy(substring, s, len);
substring[len] = '\0';
}
//check for out of bound access and return NULL if s is NULL or allocation fails
//len 0 or out of bound start just returns a null character
char *ft_substr(char const *s, unsigned int start, size_t len)
{
char *substring;
size_t slen;
if (!s)
return (NULL);
slen = ft_strlen(s);
if (slen <= start)
return (ft_strdup(""));
s = &s[start];
slen -= start;
if (slen > len)
substring = malloc(sizeof(char) * (len + 1));
else
substring = malloc(sizeof(char) * (slen + 1));
if (!substring)
return (NULL);
if (slen > len)
ft_memcpy_with_nullchar(substring, s, len);
else
ft_memcpy_with_nullchar(substring, s, slen);
return (substring);
}