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ft_strnstr.c
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ft_strnstr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strnstr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: mschumac <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2017/05/21 00:08:34 by mschumac #+# #+# */
/* Updated: 2017/06/12 21:46:16 by mschumac ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
char *ft_strnstr(const char *haystack, const char *needle, size_t len)
{
char *haystack_copy;
char *result;
int found_string_offset;
if (len >= ft_strlen(haystack))
return (ft_strstr(haystack, needle));
if (!(haystack_copy = ft_strnew(len + 1)))
return (NULL);
haystack_copy = ft_strncpy(haystack_copy, haystack, len);
haystack_copy[len] = '\0';
if ((result = ft_strstr(haystack_copy, needle)))
{
found_string_offset = result - haystack_copy;
free(haystack_copy);
return ((char*)haystack + (found_string_offset));
}
else
return (NULL);
}