ft_strnstr.c

#include "libft.h"

char	*ft_strnstr(const char *str, const char *to_find, size_t len)
{
	size_t	i;
	size_t	j;

	i = 0;
	if (!str && !len)
		return (0);
	if (to_find[0] == '\0' || to_find == str)
		return ((char *)str);
	while (str[i] != '\0')
	{
		j = 0;
		while (str[i + j] == to_find[j] && (i + j) < len)
		{
			if (str[i + j] == '\0' && to_find[j] == '\0')
				return ((char *)&str[i]);
			j++;
		}
		if (to_find[j] == '\0')
			return ((char *)(str + i));
		i++;
	}
	return (0);
}