-
Notifications
You must be signed in to change notification settings - Fork 0
/
ft_strnstr.c
42 lines (38 loc) · 1.4 KB
/
ft_strnstr.c
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
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strnstr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: doriani <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/02/22 17:29:29 by doriani #+# #+# */
/* Updated: 2023/04/04 20:12:27 by doriani ### ########.fr */
/* */
/* ************************************************************************** */
#include <string.h>
static int is_substring(char *str, const char *sub, size_t len)
{
while (*sub && len-- > 0)
if (*str++ != *sub++)
return (0);
if (*sub)
return (0);
return (1);
}
char *ft_strnstr(const char *big, const char *little, size_t len)
{
char *runner;
if (len == 0 && !big)
return (NULL);
runner = (char *) big;
if (*little == '\0')
return (runner);
while (*runner && len > 0)
{
if (*runner == *little && is_substring(runner, little, len))
return (runner);
runner++;
len--;
}
return (NULL);
}