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ft_strnstr.c
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ft_strnstr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strnstr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: mrychkov <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2017/04/29 18:58:46 by mrychkov #+# #+# */
/* Updated: 2017/04/29 19:00:20 by mrychkov ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
char *ft_strnstr(const char *s1, const char *s2, size_t len)
{
size_t i;
size_t j;
i = 0;
if (ft_strlen(s2) == 0)
return ((char*)s1);
if (ft_strlen(s1) == 0 || len == 0)
return (NULL);
len = len - 1;
while (s1[i] && (i <= len))
{
j = 0;
while (s1[i + j] == s2[j])
{
if ((i + j == len + 1) && (j + 1 != '\0'))
return (NULL);
j++;
if (s2[j] == '\0')
return ((char*)s1 + i);
}
i++;
}
return (0);
}