ft_strnstr.c File Reference

#include <stdlib.h>

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Functions
char *	ft_strnstr (const char *haystack, const char *needle, size_t len)
	Finds a substring within a bounded string region.

Function Documentation

ft_strnstr()

char * ft_strnstr	(	const char *	haystack,
		const char *	needle,
		size_t	len
	)

Finds a substring within a bounded string region.

Searches needle in haystack but not beyond len bytes.

Parameters

haystack	String to search in.
needle	Substring to search for.
len	Maximum number of bytes to inspect in haystack.

Returns

Pointer to first match, or NULL when not found.

Definition at line 25 of file ft_strnstr.c.

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