libft/ft_strnstr.c at master · menasy/libft · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/*
 ███▄ ▄███▓▓█████  ███▄    █  ▄▄▄        ██████▓██   ██▓
▓██▒▀█▀ ██▒▓█   ▀  ██ ▀█   █ ▒████▄    ▒██    ▒ ▒██  ██▒
▓██    ▓██░▒███   ▓██  ▀█ ██▒▒██  ▀█▄  ░ ▓██▄    ▒██ ██░
▒██    ▒██ ▒▓█  ▄ ▓██▒  ▐▌██▒░██▄▄▄▄██   ▒   ██▒ ░ ▐██▓░
▒██▒   ░██▒░▒████▒▒██░   ▓██░ ▓█   ▓██▒▒██████▒▒ ░ ██▒▓░
░ ▒░   ░  ░░░ ▒░ ░░ ▒░   ▒ ▒  ▒▒   ▓▒█░▒ ▒▓▒ ▒ ░  ██▒▒▒
░  ░      ░ ░ ░  ░░ ░░   ░ ▒░  ▒   ▒▒ ░░ ░▒  ░ ░▓██ ░▒░
░      ░      ░      ░   ░ ░   ░   ▒   ░  ░  ░  ▒ ▒ ░░
       ░      ░  ░         ░       ░  ░      ░  ░ ░
                                                ░ ░*/

#include "libft.h"

char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
{
	size_t	i;
	size_t	j;
	size_t	k;
	char	*str;
	char	*find;

	i = 0;
	str = (char *)haystack;
	find = (char *)needle;
	if (!find[0])
		return (str);
	while (i < len && str[i])
	{
		j = 0;
		k = i;
		while ((str[k] == find[j]) && str[k] && k < len)
		{
			k++;
			j++;
		}
		if (find[j] == '\0')
			return ((char *)str + i);
		i++;
	}
	return (NULL);
}